xref: /openbmc/linux/arch/s390/kvm/kvm-s390.c (revision be48d86f77f0cbceecadf10fda6330d82a0a77b7)

// SPDX-License-Identifier: GPL-2.0
/*
 * hosting IBM Z kernel virtual machines (s390x)
 *
 * Copyright IBM Corp. 2008, 2020
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 *               Christian Ehrhardt <ehrhardt@de.ibm.com>
 *               Jason J. Herne <jjherne@us.ibm.com>
 */

#define KMSG_COMPONENT "kvm-s390"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/hrtimer.h>
#include <linux/init.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/mman.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/vmalloc.h>
#include <linux/bitmap.h>
#include <linux/sched/signal.h>
#include <linux/string.h>
#include <linux/pgtable.h>

#include <asm/asm-offsets.h>
#include <asm/lowcore.h>
#include <asm/stp.h>
#include <asm/gmap.h>
#include <asm/nmi.h>
#include <asm/switch_to.h>
#include <asm/isc.h>
#include <asm/sclp.h>
#include <asm/cpacf.h>
#include <asm/timex.h>
#include <asm/ap.h>
#include <asm/uv.h>
#include <asm/fpu/api.h>
#include "kvm-s390.h"
#include "gaccess.h"
#include "pci.h"

#define CREATE_TRACE_POINTS
#include "trace.h"
#include "trace-s390.h"

#define MEM_OP_MAX_SIZE 65536	/* Maximum transfer size for KVM_S390_MEM_OP */
#define LOCAL_IRQS 32
#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
			   (KVM_MAX_VCPUS + LOCAL_IRQS))

const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
	KVM_GENERIC_VM_STATS(),
	STATS_DESC_COUNTER(VM, inject_io),
	STATS_DESC_COUNTER(VM, inject_float_mchk),
	STATS_DESC_COUNTER(VM, inject_pfault_done),
	STATS_DESC_COUNTER(VM, inject_service_signal),
	STATS_DESC_COUNTER(VM, inject_virtio),
	STATS_DESC_COUNTER(VM, aen_forward)
};

const struct kvm_stats_header kvm_vm_stats_header = {
	.name_size = KVM_STATS_NAME_SIZE,
	.num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
	.id_offset = sizeof(struct kvm_stats_header),
	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
		       sizeof(kvm_vm_stats_desc),
};

const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
	KVM_GENERIC_VCPU_STATS(),
	STATS_DESC_COUNTER(VCPU, exit_userspace),
	STATS_DESC_COUNTER(VCPU, exit_null),
	STATS_DESC_COUNTER(VCPU, exit_external_request),
	STATS_DESC_COUNTER(VCPU, exit_io_request),
	STATS_DESC_COUNTER(VCPU, exit_external_interrupt),
	STATS_DESC_COUNTER(VCPU, exit_stop_request),
	STATS_DESC_COUNTER(VCPU, exit_validity),
	STATS_DESC_COUNTER(VCPU, exit_instruction),
	STATS_DESC_COUNTER(VCPU, exit_pei),
	STATS_DESC_COUNTER(VCPU, halt_no_poll_steal),
	STATS_DESC_COUNTER(VCPU, instruction_lctl),
	STATS_DESC_COUNTER(VCPU, instruction_lctlg),
	STATS_DESC_COUNTER(VCPU, instruction_stctl),
	STATS_DESC_COUNTER(VCPU, instruction_stctg),
	STATS_DESC_COUNTER(VCPU, exit_program_interruption),
	STATS_DESC_COUNTER(VCPU, exit_instr_and_program),
	STATS_DESC_COUNTER(VCPU, exit_operation_exception),
	STATS_DESC_COUNTER(VCPU, deliver_ckc),
	STATS_DESC_COUNTER(VCPU, deliver_cputm),
	STATS_DESC_COUNTER(VCPU, deliver_external_call),
	STATS_DESC_COUNTER(VCPU, deliver_emergency_signal),
	STATS_DESC_COUNTER(VCPU, deliver_service_signal),
	STATS_DESC_COUNTER(VCPU, deliver_virtio),
	STATS_DESC_COUNTER(VCPU, deliver_stop_signal),
	STATS_DESC_COUNTER(VCPU, deliver_prefix_signal),
	STATS_DESC_COUNTER(VCPU, deliver_restart_signal),
	STATS_DESC_COUNTER(VCPU, deliver_program),
	STATS_DESC_COUNTER(VCPU, deliver_io),
	STATS_DESC_COUNTER(VCPU, deliver_machine_check),
	STATS_DESC_COUNTER(VCPU, exit_wait_state),
	STATS_DESC_COUNTER(VCPU, inject_ckc),
	STATS_DESC_COUNTER(VCPU, inject_cputm),
	STATS_DESC_COUNTER(VCPU, inject_external_call),
	STATS_DESC_COUNTER(VCPU, inject_emergency_signal),
	STATS_DESC_COUNTER(VCPU, inject_mchk),
	STATS_DESC_COUNTER(VCPU, inject_pfault_init),
	STATS_DESC_COUNTER(VCPU, inject_program),
	STATS_DESC_COUNTER(VCPU, inject_restart),
	STATS_DESC_COUNTER(VCPU, inject_set_prefix),
	STATS_DESC_COUNTER(VCPU, inject_stop_signal),
	STATS_DESC_COUNTER(VCPU, instruction_epsw),
	STATS_DESC_COUNTER(VCPU, instruction_gs),
	STATS_DESC_COUNTER(VCPU, instruction_io_other),
	STATS_DESC_COUNTER(VCPU, instruction_lpsw),
	STATS_DESC_COUNTER(VCPU, instruction_lpswe),
	STATS_DESC_COUNTER(VCPU, instruction_pfmf),
	STATS_DESC_COUNTER(VCPU, instruction_ptff),
	STATS_DESC_COUNTER(VCPU, instruction_sck),
	STATS_DESC_COUNTER(VCPU, instruction_sckpf),
	STATS_DESC_COUNTER(VCPU, instruction_stidp),
	STATS_DESC_COUNTER(VCPU, instruction_spx),
	STATS_DESC_COUNTER(VCPU, instruction_stpx),
	STATS_DESC_COUNTER(VCPU, instruction_stap),
	STATS_DESC_COUNTER(VCPU, instruction_iske),
	STATS_DESC_COUNTER(VCPU, instruction_ri),
	STATS_DESC_COUNTER(VCPU, instruction_rrbe),
	STATS_DESC_COUNTER(VCPU, instruction_sske),
	STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock),
	STATS_DESC_COUNTER(VCPU, instruction_stsi),
	STATS_DESC_COUNTER(VCPU, instruction_stfl),
	STATS_DESC_COUNTER(VCPU, instruction_tb),
	STATS_DESC_COUNTER(VCPU, instruction_tpi),
	STATS_DESC_COUNTER(VCPU, instruction_tprot),
	STATS_DESC_COUNTER(VCPU, instruction_tsch),
	STATS_DESC_COUNTER(VCPU, instruction_sie),
	STATS_DESC_COUNTER(VCPU, instruction_essa),
	STATS_DESC_COUNTER(VCPU, instruction_sthyi),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_sense),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_start),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_stop),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_arch),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_restart),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset),
	STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_10),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_44),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c),
	STATS_DESC_COUNTER(VCPU, diag_9c_ignored),
	STATS_DESC_COUNTER(VCPU, diag_9c_forward),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_258),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_308),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_500),
	STATS_DESC_COUNTER(VCPU, instruction_diagnose_other),
	STATS_DESC_COUNTER(VCPU, pfault_sync)
};

const struct kvm_stats_header kvm_vcpu_stats_header = {
	.name_size = KVM_STATS_NAME_SIZE,
	.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
	.id_offset = sizeof(struct kvm_stats_header),
	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
		       sizeof(kvm_vcpu_stats_desc),
};

/* allow nested virtualization in KVM (if enabled by user space) */
static int nested;
module_param(nested, int, S_IRUGO);
MODULE_PARM_DESC(nested, "Nested virtualization support");

/* allow 1m huge page guest backing, if !nested */
static int hpage;
module_param(hpage, int, 0444);
MODULE_PARM_DESC(hpage, "1m huge page backing support");

/* maximum percentage of steal time for polling.  >100 is treated like 100 */
static u8 halt_poll_max_steal = 10;
module_param(halt_poll_max_steal, byte, 0644);
MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");

/* if set to true, the GISA will be initialized and used if available */
static bool use_gisa  = true;
module_param(use_gisa, bool, 0644);
MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it.");

/* maximum diag9c forwarding per second */
unsigned int diag9c_forwarding_hz;
module_param(diag9c_forwarding_hz, uint, 0644);
MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");

/*
 * For now we handle at most 16 double words as this is what the s390 base
 * kernel handles and stores in the prefix page. If we ever need to go beyond
 * this, this requires changes to code, but the external uapi can stay.
 */
#define SIZE_INTERNAL 16

/*
 * Base feature mask that defines default mask for facilities. Consists of the
 * defines in FACILITIES_KVM and the non-hypervisor managed bits.
 */
static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
/*
 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
 * and defines the facilities that can be enabled via a cpu model.
 */
static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };

static unsigned long kvm_s390_fac_size(void)
{
	BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
	BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
	BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
		sizeof(stfle_fac_list));

	return SIZE_INTERNAL;
}

/* available cpu features supported by kvm */
static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
/* available subfunctions indicated via query / "test bit" */
static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;

static struct gmap_notifier gmap_notifier;
static struct gmap_notifier vsie_gmap_notifier;
debug_info_t *kvm_s390_dbf;
debug_info_t *kvm_s390_dbf_uv;

/* Section: not file related */
int kvm_arch_hardware_enable(void)
{
	/* every s390 is virtualization enabled ;-) */
	return 0;
}

int kvm_arch_check_processor_compat(void *opaque)
{
	return 0;
}

/* forward declarations */
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end);
static int sca_switch_to_extended(struct kvm *kvm);

static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
{
	u8 delta_idx = 0;

	/*
	 * The TOD jumps by delta, we have to compensate this by adding
	 * -delta to the epoch.
	 */
	delta = -delta;

	/* sign-extension - we're adding to signed values below */
	if ((s64)delta < 0)
		delta_idx = -1;

	scb->epoch += delta;
	if (scb->ecd & ECD_MEF) {
		scb->epdx += delta_idx;
		if (scb->epoch < delta)
			scb->epdx += 1;
	}
}

/*
 * This callback is executed during stop_machine(). All CPUs are therefore
 * temporarily stopped. In order not to change guest behavior, we have to
 * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 * so a CPU won't be stopped while calculating with the epoch.
 */
static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
			  void *v)
{
	struct kvm *kvm;
	struct kvm_vcpu *vcpu;
	unsigned long i;
	unsigned long long *delta = v;

	list_for_each_entry(kvm, &vm_list, vm_list) {
		kvm_for_each_vcpu(i, vcpu, kvm) {
			kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
			if (i == 0) {
				kvm->arch.epoch = vcpu->arch.sie_block->epoch;
				kvm->arch.epdx = vcpu->arch.sie_block->epdx;
			}
			if (vcpu->arch.cputm_enabled)
				vcpu->arch.cputm_start += *delta;
			if (vcpu->arch.vsie_block)
				kvm_clock_sync_scb(vcpu->arch.vsie_block,
						   *delta);
		}
	}
	return NOTIFY_OK;
}

static struct notifier_block kvm_clock_notifier = {
	.notifier_call = kvm_clock_sync,
};

int kvm_arch_hardware_setup(void *opaque)
{
	gmap_notifier.notifier_call = kvm_gmap_notifier;
	gmap_register_pte_notifier(&gmap_notifier);
	vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
	gmap_register_pte_notifier(&vsie_gmap_notifier);
	atomic_notifier_chain_register(&s390_epoch_delta_notifier,
				       &kvm_clock_notifier);
	return 0;
}

void kvm_arch_hardware_unsetup(void)
{
	gmap_unregister_pte_notifier(&gmap_notifier);
	gmap_unregister_pte_notifier(&vsie_gmap_notifier);
	atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
					 &kvm_clock_notifier);
}

static void allow_cpu_feat(unsigned long nr)
{
	set_bit_inv(nr, kvm_s390_available_cpu_feat);
}

static inline int plo_test_bit(unsigned char nr)
{
	unsigned long function = (unsigned long)nr | 0x100;
	int cc;

	asm volatile(
		"	lgr	0,%[function]\n"
		/* Parameter registers are ignored for "test bit" */
		"	plo	0,0,0,0(0)\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc)
		: [function] "d" (function)
		: "cc", "0");
	return cc == 0;
}

static __always_inline void __insn32_query(unsigned int opcode, u8 *query)
{
	asm volatile(
		"	lghi	0,0\n"
		"	lgr	1,%[query]\n"
		/* Parameter registers are ignored */
		"	.insn	rrf,%[opc] << 16,2,4,6,0\n"
		:
		: [query] "d" ((unsigned long)query), [opc] "i" (opcode)
		: "cc", "memory", "0", "1");
}

#define INSN_SORTL 0xb938
#define INSN_DFLTCC 0xb939

static void kvm_s390_cpu_feat_init(void)
{
	int i;

	for (i = 0; i < 256; ++i) {
		if (plo_test_bit(i))
			kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
	}

	if (test_facility(28)) /* TOD-clock steering */
		ptff(kvm_s390_available_subfunc.ptff,
		     sizeof(kvm_s390_available_subfunc.ptff),
		     PTFF_QAF);

	if (test_facility(17)) { /* MSA */
		__cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmac);
		__cpacf_query(CPACF_KMC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmc);
		__cpacf_query(CPACF_KM, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.km);
		__cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kimd);
		__cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.klmd);
	}
	if (test_facility(76)) /* MSA3 */
		__cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.pckmo);
	if (test_facility(77)) { /* MSA4 */
		__cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmctr);
		__cpacf_query(CPACF_KMF, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmf);
		__cpacf_query(CPACF_KMO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmo);
		__cpacf_query(CPACF_PCC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.pcc);
	}
	if (test_facility(57)) /* MSA5 */
		__cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.ppno);

	if (test_facility(146)) /* MSA8 */
		__cpacf_query(CPACF_KMA, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kma);

	if (test_facility(155)) /* MSA9 */
		__cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kdsa);

	if (test_facility(150)) /* SORTL */
		__insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);

	if (test_facility(151)) /* DFLTCC */
		__insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);

	if (MACHINE_HAS_ESOP)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
	/*
	 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
	 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
	 */
	if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
	    !test_facility(3) || !nested)
		return;
	allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
	if (sclp.has_64bscao)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
	if (sclp.has_siif)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
	if (sclp.has_gpere)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
	if (sclp.has_gsls)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
	if (sclp.has_ib)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
	if (sclp.has_cei)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
	if (sclp.has_ibs)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
	if (sclp.has_kss)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
	/*
	 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
	 * all skey handling functions read/set the skey from the PGSTE
	 * instead of the real storage key.
	 *
	 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
	 * pages being detected as preserved although they are resident.
	 *
	 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
	 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
	 *
	 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
	 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
	 * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
	 *
	 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
	 * cannot easily shadow the SCA because of the ipte lock.
	 */
}

int kvm_arch_init(void *opaque)
{
	int rc = -ENOMEM;

	kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
	if (!kvm_s390_dbf)
		return -ENOMEM;

	kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long));
	if (!kvm_s390_dbf_uv)
		goto out;

	if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) ||
	    debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view))
		goto out;

	kvm_s390_cpu_feat_init();

	/* Register floating interrupt controller interface. */
	rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
	if (rc) {
		pr_err("A FLIC registration call failed with rc=%d\n", rc);
		goto out;
	}

	if (kvm_s390_pci_interp_allowed()) {
		rc = kvm_s390_pci_init();
		if (rc) {
			pr_err("Unable to allocate AIFT for PCI\n");
			goto out;
		}
	}

	rc = kvm_s390_gib_init(GAL_ISC);
	if (rc)
		goto out;

	return 0;

out:
	kvm_arch_exit();
	return rc;
}

void kvm_arch_exit(void)
{
	kvm_s390_gib_destroy();
	if (kvm_s390_pci_interp_allowed())
		kvm_s390_pci_exit();
	debug_unregister(kvm_s390_dbf);
	debug_unregister(kvm_s390_dbf_uv);
}

/* Section: device related */
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg)
{
	if (ioctl == KVM_S390_ENABLE_SIE)
		return s390_enable_sie();
	return -EINVAL;
}

int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
	int r;

	switch (ext) {
	case KVM_CAP_S390_PSW:
	case KVM_CAP_S390_GMAP:
	case KVM_CAP_SYNC_MMU:
#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_CAP_S390_UCONTROL:
#endif
	case KVM_CAP_ASYNC_PF:
	case KVM_CAP_SYNC_REGS:
	case KVM_CAP_ONE_REG:
	case KVM_CAP_ENABLE_CAP:
	case KVM_CAP_S390_CSS_SUPPORT:
	case KVM_CAP_IOEVENTFD:
	case KVM_CAP_DEVICE_CTRL:
	case KVM_CAP_S390_IRQCHIP:
	case KVM_CAP_VM_ATTRIBUTES:
	case KVM_CAP_MP_STATE:
	case KVM_CAP_IMMEDIATE_EXIT:
	case KVM_CAP_S390_INJECT_IRQ:
	case KVM_CAP_S390_USER_SIGP:
	case KVM_CAP_S390_USER_STSI:
	case KVM_CAP_S390_SKEYS:
	case KVM_CAP_S390_IRQ_STATE:
	case KVM_CAP_S390_USER_INSTR0:
	case KVM_CAP_S390_CMMA_MIGRATION:
	case KVM_CAP_S390_AIS:
	case KVM_CAP_S390_AIS_MIGRATION:
	case KVM_CAP_S390_VCPU_RESETS:
	case KVM_CAP_SET_GUEST_DEBUG:
	case KVM_CAP_S390_DIAG318:
	case KVM_CAP_S390_MEM_OP_EXTENSION:
		r = 1;
		break;
	case KVM_CAP_SET_GUEST_DEBUG2:
		r = KVM_GUESTDBG_VALID_MASK;
		break;
	case KVM_CAP_S390_HPAGE_1M:
		r = 0;
		if (hpage && !kvm_is_ucontrol(kvm))
			r = 1;
		break;
	case KVM_CAP_S390_MEM_OP:
		r = MEM_OP_MAX_SIZE;
		break;
	case KVM_CAP_NR_VCPUS:
	case KVM_CAP_MAX_VCPUS:
	case KVM_CAP_MAX_VCPU_ID:
		r = KVM_S390_BSCA_CPU_SLOTS;
		if (!kvm_s390_use_sca_entries())
			r = KVM_MAX_VCPUS;
		else if (sclp.has_esca && sclp.has_64bscao)
			r = KVM_S390_ESCA_CPU_SLOTS;
		if (ext == KVM_CAP_NR_VCPUS)
			r = min_t(unsigned int, num_online_cpus(), r);
		break;
	case KVM_CAP_S390_COW:
		r = MACHINE_HAS_ESOP;
		break;
	case KVM_CAP_S390_VECTOR_REGISTERS:
		r = MACHINE_HAS_VX;
		break;
	case KVM_CAP_S390_RI:
		r = test_facility(64);
		break;
	case KVM_CAP_S390_GS:
		r = test_facility(133);
		break;
	case KVM_CAP_S390_BPB:
		r = test_facility(82);
		break;
	case KVM_CAP_S390_PROTECTED:
		r = is_prot_virt_host();
		break;
	case KVM_CAP_S390_PROTECTED_DUMP: {
		u64 pv_cmds_dump[] = {
			BIT_UVC_CMD_DUMP_INIT,
			BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
			BIT_UVC_CMD_DUMP_CPU,
			BIT_UVC_CMD_DUMP_COMPLETE,
		};
		int i;

		r = is_prot_virt_host();

		for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
			if (!test_bit_inv(pv_cmds_dump[i],
					  (unsigned long *)&uv_info.inst_calls_list)) {
				r = 0;
				break;
			}
		}
		break;
	}
	case KVM_CAP_S390_ZPCI_OP:
		r = kvm_s390_pci_interp_allowed();
		break;
	default:
		r = 0;
	}
	return r;
}

void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
{
	int i;
	gfn_t cur_gfn, last_gfn;
	unsigned long gaddr, vmaddr;
	struct gmap *gmap = kvm->arch.gmap;
	DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);

	/* Loop over all guest segments */
	cur_gfn = memslot->base_gfn;
	last_gfn = memslot->base_gfn + memslot->npages;
	for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
		gaddr = gfn_to_gpa(cur_gfn);
		vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
		if (kvm_is_error_hva(vmaddr))
			continue;

		bitmap_zero(bitmap, _PAGE_ENTRIES);
		gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
		for (i = 0; i < _PAGE_ENTRIES; i++) {
			if (test_bit(i, bitmap))
				mark_page_dirty(kvm, cur_gfn + i);
		}

		if (fatal_signal_pending(current))
			return;
		cond_resched();
	}
}

/* Section: vm related */
static void sca_del_vcpu(struct kvm_vcpu *vcpu);

/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
			       struct kvm_dirty_log *log)
{
	int r;
	unsigned long n;
	struct kvm_memory_slot *memslot;
	int is_dirty;

	if (kvm_is_ucontrol(kvm))
		return -EINVAL;

	mutex_lock(&kvm->slots_lock);

	r = -EINVAL;
	if (log->slot >= KVM_USER_MEM_SLOTS)
		goto out;

	r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot);
	if (r)
		goto out;

	/* Clear the dirty log */
	if (is_dirty) {
		n = kvm_dirty_bitmap_bytes(memslot);
		memset(memslot->dirty_bitmap, 0, n);
	}
	r = 0;
out:
	mutex_unlock(&kvm->slots_lock);
	return r;
}

static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
{
	unsigned long i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
	}
}

int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
	case KVM_CAP_S390_IRQCHIP:
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
		kvm->arch.use_irqchip = 1;
		r = 0;
		break;
	case KVM_CAP_S390_USER_SIGP:
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
		kvm->arch.user_sigp = 1;
		r = 0;
		break;
	case KVM_CAP_S390_VECTOR_REGISTERS:
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus) {
			r = -EBUSY;
		} else if (MACHINE_HAS_VX) {
			set_kvm_facility(kvm->arch.model.fac_mask, 129);
			set_kvm_facility(kvm->arch.model.fac_list, 129);
			if (test_facility(134)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 134);
				set_kvm_facility(kvm->arch.model.fac_list, 134);
			}
			if (test_facility(135)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 135);
				set_kvm_facility(kvm->arch.model.fac_list, 135);
			}
			if (test_facility(148)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 148);
				set_kvm_facility(kvm->arch.model.fac_list, 148);
			}
			if (test_facility(152)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 152);
				set_kvm_facility(kvm->arch.model.fac_list, 152);
			}
			if (test_facility(192)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 192);
				set_kvm_facility(kvm->arch.model.fac_list, 192);
			}
			r = 0;
		} else
			r = -EINVAL;
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
			 r ? "(not available)" : "(success)");
		break;
	case KVM_CAP_S390_RI:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus) {
			r = -EBUSY;
		} else if (test_facility(64)) {
			set_kvm_facility(kvm->arch.model.fac_mask, 64);
			set_kvm_facility(kvm->arch.model.fac_list, 64);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
			 r ? "(not available)" : "(success)");
		break;
	case KVM_CAP_S390_AIS:
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus) {
			r = -EBUSY;
		} else {
			set_kvm_facility(kvm->arch.model.fac_mask, 72);
			set_kvm_facility(kvm->arch.model.fac_list, 72);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: AIS %s",
			 r ? "(not available)" : "(success)");
		break;
	case KVM_CAP_S390_GS:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus) {
			r = -EBUSY;
		} else if (test_facility(133)) {
			set_kvm_facility(kvm->arch.model.fac_mask, 133);
			set_kvm_facility(kvm->arch.model.fac_list, 133);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
			 r ? "(not available)" : "(success)");
		break;
	case KVM_CAP_S390_HPAGE_1M:
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus)
			r = -EBUSY;
		else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
			r = -EINVAL;
		else {
			r = 0;
			mmap_write_lock(kvm->mm);
			kvm->mm->context.allow_gmap_hpage_1m = 1;
			mmap_write_unlock(kvm->mm);
			/*
			 * We might have to create fake 4k page
			 * tables. To avoid that the hardware works on
			 * stale PGSTEs, we emulate these instructions.
			 */
			kvm->arch.use_skf = 0;
			kvm->arch.use_pfmfi = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
			 r ? "(not available)" : "(success)");
		break;
	case KVM_CAP_S390_USER_STSI:
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
		kvm->arch.user_stsi = 1;
		r = 0;
		break;
	case KVM_CAP_S390_USER_INSTR0:
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
		kvm->arch.user_instr0 = 1;
		icpt_operexc_on_all_vcpus(kvm);
		r = 0;
		break;
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->attr) {
	case KVM_S390_VM_MEM_LIMIT_SIZE:
		ret = 0;
		VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
			 kvm->arch.mem_limit);
		if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
			ret = -EFAULT;
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;
	unsigned int idx;
	switch (attr->attr) {
	case KVM_S390_VM_MEM_ENABLE_CMMA:
		ret = -ENXIO;
		if (!sclp.has_cmma)
			break;

		VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus)
			ret = -EBUSY;
		else if (kvm->mm->context.allow_gmap_hpage_1m)
			ret = -EINVAL;
		else {
			kvm->arch.use_cmma = 1;
			/* Not compatible with cmma. */
			kvm->arch.use_pfmfi = 0;
			ret = 0;
		}
		mutex_unlock(&kvm->lock);
		break;
	case KVM_S390_VM_MEM_CLR_CMMA:
		ret = -ENXIO;
		if (!sclp.has_cmma)
			break;
		ret = -EINVAL;
		if (!kvm->arch.use_cmma)
			break;

		VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
		mutex_lock(&kvm->lock);
		idx = srcu_read_lock(&kvm->srcu);
		s390_reset_cmma(kvm->arch.gmap->mm);
		srcu_read_unlock(&kvm->srcu, idx);
		mutex_unlock(&kvm->lock);
		ret = 0;
		break;
	case KVM_S390_VM_MEM_LIMIT_SIZE: {
		unsigned long new_limit;

		if (kvm_is_ucontrol(kvm))
			return -EINVAL;

		if (get_user(new_limit, (u64 __user *)attr->addr))
			return -EFAULT;

		if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
		    new_limit > kvm->arch.mem_limit)
			return -E2BIG;

		if (!new_limit)
			return -EINVAL;

		/* gmap_create takes last usable address */
		if (new_limit != KVM_S390_NO_MEM_LIMIT)
			new_limit -= 1;

		ret = -EBUSY;
		mutex_lock(&kvm->lock);
		if (!kvm->created_vcpus) {
			/* gmap_create will round the limit up */
			struct gmap *new = gmap_create(current->mm, new_limit);

			if (!new) {
				ret = -ENOMEM;
			} else {
				gmap_remove(kvm->arch.gmap);
				new->private = kvm;
				kvm->arch.gmap = new;
				ret = 0;
			}
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
		VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
			 (void *) kvm->arch.gmap->asce);
		break;
	}
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);

void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
{
	struct kvm_vcpu *vcpu;
	unsigned long i;

	kvm_s390_vcpu_block_all(kvm);

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_vcpu_crypto_setup(vcpu);
		/* recreate the shadow crycb by leaving the VSIE handler */
		kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
	}

	kvm_s390_vcpu_unblock_all(kvm);
}

static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
{
	mutex_lock(&kvm->lock);
	switch (attr->attr) {
	case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
		if (!test_kvm_facility(kvm, 76)) {
			mutex_unlock(&kvm->lock);
			return -EINVAL;
		}
		get_random_bytes(
			kvm->arch.crypto.crycb->aes_wrapping_key_mask,
			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
		kvm->arch.crypto.aes_kw = 1;
		VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
		break;
	case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
		if (!test_kvm_facility(kvm, 76)) {
			mutex_unlock(&kvm->lock);
			return -EINVAL;
		}
		get_random_bytes(
			kvm->arch.crypto.crycb->dea_wrapping_key_mask,
			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
		kvm->arch.crypto.dea_kw = 1;
		VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
		if (!test_kvm_facility(kvm, 76)) {
			mutex_unlock(&kvm->lock);
			return -EINVAL;
		}
		kvm->arch.crypto.aes_kw = 0;
		memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
		VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
		if (!test_kvm_facility(kvm, 76)) {
			mutex_unlock(&kvm->lock);
			return -EINVAL;
		}
		kvm->arch.crypto.dea_kw = 0;
		memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
		VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
		break;
	case KVM_S390_VM_CRYPTO_ENABLE_APIE:
		if (!ap_instructions_available()) {
			mutex_unlock(&kvm->lock);
			return -EOPNOTSUPP;
		}
		kvm->arch.crypto.apie = 1;
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_APIE:
		if (!ap_instructions_available()) {
			mutex_unlock(&kvm->lock);
			return -EOPNOTSUPP;
		}
		kvm->arch.crypto.apie = 0;
		break;
	default:
		mutex_unlock(&kvm->lock);
		return -ENXIO;
	}

	kvm_s390_vcpu_crypto_reset_all(kvm);
	mutex_unlock(&kvm->lock);
	return 0;
}

static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu)
{
	/* Only set the ECB bits after guest requests zPCI interpretation */
	if (!vcpu->kvm->arch.use_zpci_interp)
		return;

	vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI;
	vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI;
}

void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
{
	struct kvm_vcpu *vcpu;
	unsigned long i;

	lockdep_assert_held(&kvm->lock);

	if (!kvm_s390_pci_interp_allowed())
		return;

	/*
	 * If host is configured for PCI and the necessary facilities are
	 * available, turn on interpretation for the life of this guest
	 */
	kvm->arch.use_zpci_interp = 1;

	kvm_s390_vcpu_block_all(kvm);

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_vcpu_pci_setup(vcpu);
		kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
	}

	kvm_s390_vcpu_unblock_all(kvm);
}

static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
{
	unsigned long cx;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(cx, vcpu, kvm)
		kvm_s390_sync_request(req, vcpu);
}

/*
 * Must be called with kvm->srcu held to avoid races on memslots, and with
 * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 */
static int kvm_s390_vm_start_migration(struct kvm *kvm)
{
	struct kvm_memory_slot *ms;
	struct kvm_memslots *slots;
	unsigned long ram_pages = 0;
	int bkt;

	/* migration mode already enabled */
	if (kvm->arch.migration_mode)
		return 0;
	slots = kvm_memslots(kvm);
	if (!slots || kvm_memslots_empty(slots))
		return -EINVAL;

	if (!kvm->arch.use_cmma) {
		kvm->arch.migration_mode = 1;
		return 0;
	}
	/* mark all the pages in active slots as dirty */
	kvm_for_each_memslot(ms, bkt, slots) {
		if (!ms->dirty_bitmap)
			return -EINVAL;
		/*
		 * The second half of the bitmap is only used on x86,
		 * and would be wasted otherwise, so we put it to good
		 * use here to keep track of the state of the storage
		 * attributes.
		 */
		memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
		ram_pages += ms->npages;
	}
	atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
	kvm->arch.migration_mode = 1;
	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
	return 0;
}

/*
 * Must be called with kvm->slots_lock to avoid races with ourselves and
 * kvm_s390_vm_start_migration.
 */
static int kvm_s390_vm_stop_migration(struct kvm *kvm)
{
	/* migration mode already disabled */
	if (!kvm->arch.migration_mode)
		return 0;
	kvm->arch.migration_mode = 0;
	if (kvm->arch.use_cmma)
		kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
	return 0;
}

static int kvm_s390_vm_set_migration(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	int res = -ENXIO;

	mutex_lock(&kvm->slots_lock);
	switch (attr->attr) {
	case KVM_S390_VM_MIGRATION_START:
		res = kvm_s390_vm_start_migration(kvm);
		break;
	case KVM_S390_VM_MIGRATION_STOP:
		res = kvm_s390_vm_stop_migration(kvm);
		break;
	default:
		break;
	}
	mutex_unlock(&kvm->slots_lock);

	return res;
}

static int kvm_s390_vm_get_migration(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	u64 mig = kvm->arch.migration_mode;

	if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
		return -ENXIO;

	if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
		return -EFAULT;
	return 0;
}

static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod;

	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
		return -EFAULT;

	if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
		return -EINVAL;
	kvm_s390_set_tod_clock(kvm, &gtod);

	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
		gtod.epoch_idx, gtod.tod);

	return 0;
}

static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u8 gtod_high;

	if (copy_from_user(&gtod_high, (void __user *)attr->addr,
					   sizeof(gtod_high)))
		return -EFAULT;

	if (gtod_high != 0)
		return -EINVAL;
	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);

	return 0;
}

static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod = { 0 };

	if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
			   sizeof(gtod.tod)))
		return -EFAULT;

	kvm_s390_set_tod_clock(kvm, &gtod);
	VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
	return 0;
}

static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	if (attr->flags)
		return -EINVAL;

	switch (attr->attr) {
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_set_tod_ext(kvm, attr);
		break;
	case KVM_S390_VM_TOD_HIGH:
		ret = kvm_s390_set_tod_high(kvm, attr);
		break;
	case KVM_S390_VM_TOD_LOW:
		ret = kvm_s390_set_tod_low(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static void kvm_s390_get_tod_clock(struct kvm *kvm,
				   struct kvm_s390_vm_tod_clock *gtod)
{
	union tod_clock clk;

	preempt_disable();

	store_tod_clock_ext(&clk);

	gtod->tod = clk.tod + kvm->arch.epoch;
	gtod->epoch_idx = 0;
	if (test_kvm_facility(kvm, 139)) {
		gtod->epoch_idx = clk.ei + kvm->arch.epdx;
		if (gtod->tod < clk.tod)
			gtod->epoch_idx += 1;
	}

	preempt_enable();
}

static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod;

	memset(&gtod, 0, sizeof(gtod));
	kvm_s390_get_tod_clock(kvm, &gtod);
	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;

	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
		gtod.epoch_idx, gtod.tod);
	return 0;
}

static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u8 gtod_high = 0;

	if (copy_to_user((void __user *)attr->addr, &gtod_high,
					 sizeof(gtod_high)))
		return -EFAULT;
	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);

	return 0;
}

static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u64 gtod;

	gtod = kvm_s390_get_tod_clock_fast(kvm);
	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;
	VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);

	return 0;
}

static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	if (attr->flags)
		return -EINVAL;

	switch (attr->attr) {
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_get_tod_ext(kvm, attr);
		break;
	case KVM_S390_VM_TOD_HIGH:
		ret = kvm_s390_get_tod_high(kvm, attr);
		break;
	case KVM_S390_VM_TOD_LOW:
		ret = kvm_s390_get_tod_low(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
	u16 lowest_ibc, unblocked_ibc;
	int ret = 0;

	mutex_lock(&kvm->lock);
	if (kvm->created_vcpus) {
		ret = -EBUSY;
		goto out;
	}
	proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
	if (!proc) {
		ret = -ENOMEM;
		goto out;
	}
	if (!copy_from_user(proc, (void __user *)attr->addr,
			    sizeof(*proc))) {
		kvm->arch.model.cpuid = proc->cpuid;
		lowest_ibc = sclp.ibc >> 16 & 0xfff;
		unblocked_ibc = sclp.ibc & 0xfff;
		if (lowest_ibc && proc->ibc) {
			if (proc->ibc > unblocked_ibc)
				kvm->arch.model.ibc = unblocked_ibc;
			else if (proc->ibc < lowest_ibc)
				kvm->arch.model.ibc = lowest_ibc;
			else
				kvm->arch.model.ibc = proc->ibc;
		}
		memcpy(kvm->arch.model.fac_list, proc->fac_list,
		       S390_ARCH_FAC_LIST_SIZE_BYTE);
		VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
			 kvm->arch.model.ibc,
			 kvm->arch.model.cpuid);
		VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
			 kvm->arch.model.fac_list[0],
			 kvm->arch.model.fac_list[1],
			 kvm->arch.model.fac_list[2]);
	} else
		ret = -EFAULT;
	kfree(proc);
out:
	mutex_unlock(&kvm->lock);
	return ret;
}

static int kvm_s390_set_processor_feat(struct kvm *kvm,
				       struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
		return -EFAULT;
	if (!bitmap_subset((unsigned long *) data.feat,
			   kvm_s390_available_cpu_feat,
			   KVM_S390_VM_CPU_FEAT_NR_BITS))
		return -EINVAL;

	mutex_lock(&kvm->lock);
	if (kvm->created_vcpus) {
		mutex_unlock(&kvm->lock);
		return -EBUSY;
	}
	bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
	mutex_unlock(&kvm->lock);
	VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
			 data.feat[0],
			 data.feat[1],
			 data.feat[2]);
	return 0;
}

static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
					  struct kvm_device_attr *attr)
{
	mutex_lock(&kvm->lock);
	if (kvm->created_vcpus) {
		mutex_unlock(&kvm->lock);
		return -EBUSY;
	}

	if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
			   sizeof(struct kvm_s390_vm_cpu_subfunc))) {
		mutex_unlock(&kvm->lock);
		return -EFAULT;
	}
	mutex_unlock(&kvm->lock);

	VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
	VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
	VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
	VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
	VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
	VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
	VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
	VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
	VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
	VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
	VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
	VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
	VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
	VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
	VM_EVENT(kvm, 3, "SET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
	VM_EVENT(kvm, 3, "SET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
	VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);

	return 0;
}

static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->attr) {
	case KVM_S390_VM_CPU_PROCESSOR:
		ret = kvm_s390_set_processor(kvm, attr);
		break;
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_set_processor_feat(kvm, attr);
		break;
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_set_processor_subfunc(kvm, attr);
		break;
	}
	return ret;
}

static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
	int ret = 0;

	proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
	if (!proc) {
		ret = -ENOMEM;
		goto out;
	}
	proc->cpuid = kvm->arch.model.cpuid;
	proc->ibc = kvm->arch.model.ibc;
	memcpy(&proc->fac_list, kvm->arch.model.fac_list,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
	VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
		 kvm->arch.model.ibc,
		 kvm->arch.model.cpuid);
	VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
		 kvm->arch.model.fac_list[0],
		 kvm->arch.model.fac_list[1],
		 kvm->arch.model.fac_list[2]);
	if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
		ret = -EFAULT;
	kfree(proc);
out:
	return ret;
}

static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_machine *mach;
	int ret = 0;

	mach = kzalloc(sizeof(*mach), GFP_KERNEL_ACCOUNT);
	if (!mach) {
		ret = -ENOMEM;
		goto out;
	}
	get_cpu_id((struct cpuid *) &mach->cpuid);
	mach->ibc = sclp.ibc;
	memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
	memcpy((unsigned long *)&mach->fac_list, stfle_fac_list,
	       sizeof(stfle_fac_list));
	VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
		 kvm->arch.model.ibc,
		 kvm->arch.model.cpuid);
	VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
		 mach->fac_mask[0],
		 mach->fac_mask[1],
		 mach->fac_mask[2]);
	VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
		 mach->fac_list[0],
		 mach->fac_list[1],
		 mach->fac_list[2]);
	if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
		ret = -EFAULT;
	kfree(mach);
out:
	return ret;
}

static int kvm_s390_get_processor_feat(struct kvm *kvm,
				       struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
		return -EFAULT;
	VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
			 data.feat[0],
			 data.feat[1],
			 data.feat[2]);
	return 0;
}

static int kvm_s390_get_machine_feat(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
		return -EFAULT;
	VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
			 data.feat[0],
			 data.feat[1],
			 data.feat[2]);
	return 0;
}

static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
					  struct kvm_device_attr *attr)
{
	if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
		return -EFAULT;

	VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
	VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
	VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
	VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
	VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
	VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
	VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
	VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
	VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
	VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
	VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
	VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
	VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
	VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
	VM_EVENT(kvm, 3, "GET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
	VM_EVENT(kvm, 3, "GET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
		 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
	VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
		 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);

	return 0;
}

static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
					struct kvm_device_attr *attr)
{
	if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
		return -EFAULT;

	VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
	VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
	VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
	VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
	VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
	VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
	VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
	VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
	VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
	VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
	VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
	VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
	VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
	VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
	VM_EVENT(kvm, 3, "GET: host  KDSA   subfunc 0x%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
	VM_EVENT(kvm, 3, "GET: host  SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
		 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
	VM_EVENT(kvm, 3, "GET: host  DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
		 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);

	return 0;
}

static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->attr) {
	case KVM_S390_VM_CPU_PROCESSOR:
		ret = kvm_s390_get_processor(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE:
		ret = kvm_s390_get_machine(kvm, attr);
		break;
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_get_processor_feat(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE_FEAT:
		ret = kvm_s390_get_machine_feat(kvm, attr);
		break;
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_get_processor_subfunc(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
		ret = kvm_s390_get_machine_subfunc(kvm, attr);
		break;
	}
	return ret;
}

static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		ret = kvm_s390_set_mem_control(kvm, attr);
		break;
	case KVM_S390_VM_TOD:
		ret = kvm_s390_set_tod(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_set_cpu_model(kvm, attr);
		break;
	case KVM_S390_VM_CRYPTO:
		ret = kvm_s390_vm_set_crypto(kvm, attr);
		break;
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_set_migration(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		ret = kvm_s390_get_mem_control(kvm, attr);
		break;
	case KVM_S390_VM_TOD:
		ret = kvm_s390_get_tod(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_get_cpu_model(kvm, attr);
		break;
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_get_migration(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		switch (attr->attr) {
		case KVM_S390_VM_MEM_ENABLE_CMMA:
		case KVM_S390_VM_MEM_CLR_CMMA:
			ret = sclp.has_cmma ? 0 : -ENXIO;
			break;
		case KVM_S390_VM_MEM_LIMIT_SIZE:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
	case KVM_S390_VM_TOD:
		switch (attr->attr) {
		case KVM_S390_VM_TOD_LOW:
		case KVM_S390_VM_TOD_HIGH:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
	case KVM_S390_VM_CPU_MODEL:
		switch (attr->attr) {
		case KVM_S390_VM_CPU_PROCESSOR:
		case KVM_S390_VM_CPU_MACHINE:
		case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		case KVM_S390_VM_CPU_MACHINE_FEAT:
		case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
	case KVM_S390_VM_CRYPTO:
		switch (attr->attr) {
		case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
		case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
		case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
		case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
			ret = 0;
			break;
		case KVM_S390_VM_CRYPTO_ENABLE_APIE:
		case KVM_S390_VM_CRYPTO_DISABLE_APIE:
			ret = ap_instructions_available() ? 0 : -ENXIO;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
	case KVM_S390_VM_MIGRATION:
		ret = 0;
		break;
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
	int srcu_idx, i, r = 0;

	if (args->flags != 0)
		return -EINVAL;

	/* Is this guest using storage keys? */
	if (!mm_uses_skeys(current->mm))
		return KVM_S390_GET_SKEYS_NONE;

	/* Enforce sane limit on memory allocation */
	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
		return -EINVAL;

	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
	if (!keys)
		return -ENOMEM;

	mmap_read_lock(current->mm);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}

		r = get_guest_storage_key(current->mm, hva, &keys[i]);
		if (r)
			break;
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	mmap_read_unlock(current->mm);

	if (!r) {
		r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
				 sizeof(uint8_t) * args->count);
		if (r)
			r = -EFAULT;
	}

	kvfree(keys);
	return r;
}

static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
	int srcu_idx, i, r = 0;
	bool unlocked;

	if (args->flags != 0)
		return -EINVAL;

	/* Enforce sane limit on memory allocation */
	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
		return -EINVAL;

	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
	if (!keys)
		return -ENOMEM;

	r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
			   sizeof(uint8_t) * args->count);
	if (r) {
		r = -EFAULT;
		goto out;
	}

	/* Enable storage key handling for the guest */
	r = s390_enable_skey();
	if (r)
		goto out;

	i = 0;
	mmap_read_lock(current->mm);
	srcu_idx = srcu_read_lock(&kvm->srcu);
        while (i < args->count) {
		unlocked = false;
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}

		/* Lowest order bit is reserved */
		if (keys[i] & 0x01) {
			r = -EINVAL;
			break;
		}

		r = set_guest_storage_key(current->mm, hva, keys[i], 0);
		if (r) {
			r = fixup_user_fault(current->mm, hva,
					     FAULT_FLAG_WRITE, &unlocked);
			if (r)
				break;
		}
		if (!r)
			i++;
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	mmap_read_unlock(current->mm);
out:
	kvfree(keys);
	return r;
}

/*
 * Base address and length must be sent at the start of each block, therefore
 * it's cheaper to send some clean data, as long as it's less than the size of
 * two longs.
 */
#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
/* for consistency */
#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)

static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
			      u8 *res, unsigned long bufsize)
{
	unsigned long pgstev, hva, cur_gfn = args->start_gfn;

	args->count = 0;
	while (args->count < bufsize) {
		hva = gfn_to_hva(kvm, cur_gfn);
		/*
		 * We return an error if the first value was invalid, but we
		 * return successfully if at least one value was copied.
		 */
		if (kvm_is_error_hva(hva))
			return args->count ? 0 : -EFAULT;
		if (get_pgste(kvm->mm, hva, &pgstev) < 0)
			pgstev = 0;
		res[args->count++] = (pgstev >> 24) & 0x43;
		cur_gfn++;
	}

	return 0;
}

static struct kvm_memory_slot *gfn_to_memslot_approx(struct kvm_memslots *slots,
						     gfn_t gfn)
{
	return ____gfn_to_memslot(slots, gfn, true);
}

static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
					      unsigned long cur_gfn)
{
	struct kvm_memory_slot *ms = gfn_to_memslot_approx(slots, cur_gfn);
	unsigned long ofs = cur_gfn - ms->base_gfn;
	struct rb_node *mnode = &ms->gfn_node[slots->node_idx];

	if (ms->base_gfn + ms->npages <= cur_gfn) {
		mnode = rb_next(mnode);
		/* If we are above the highest slot, wrap around */
		if (!mnode)
			mnode = rb_first(&slots->gfn_tree);

		ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]);
		ofs = 0;
	}
	ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
	while (ofs >= ms->npages && (mnode = rb_next(mnode))) {
		ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]);
		ofs = find_first_bit(kvm_second_dirty_bitmap(ms), ms->npages);
	}
	return ms->base_gfn + ofs;
}

static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
			     u8 *res, unsigned long bufsize)
{
	unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
	struct kvm_memslots *slots = kvm_memslots(kvm);
	struct kvm_memory_slot *ms;

	if (unlikely(kvm_memslots_empty(slots)))
		return 0;

	cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
	ms = gfn_to_memslot(kvm, cur_gfn);
	args->count = 0;
	args->start_gfn = cur_gfn;
	if (!ms)
		return 0;
	next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
	mem_end = kvm_s390_get_gfn_end(slots);

	while (args->count < bufsize) {
		hva = gfn_to_hva(kvm, cur_gfn);
		if (kvm_is_error_hva(hva))
			return 0;
		/* Decrement only if we actually flipped the bit to 0 */
		if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
			atomic64_dec(&kvm->arch.cmma_dirty_pages);
		if (get_pgste(kvm->mm, hva, &pgstev) < 0)
			pgstev = 0;
		/* Save the value */
		res[args->count++] = (pgstev >> 24) & 0x43;
		/* If the next bit is too far away, stop. */
		if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
			return 0;
		/* If we reached the previous "next", find the next one */
		if (cur_gfn == next_gfn)
			next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
		/* Reached the end of memory or of the buffer, stop */
		if ((next_gfn >= mem_end) ||
		    (next_gfn - args->start_gfn >= bufsize))
			return 0;
		cur_gfn++;
		/* Reached the end of the current memslot, take the next one. */
		if (cur_gfn - ms->base_gfn >= ms->npages) {
			ms = gfn_to_memslot(kvm, cur_gfn);
			if (!ms)
				return 0;
		}
	}
	return 0;
}

/*
 * This function searches for the next page with dirty CMMA attributes, and
 * saves the attributes in the buffer up to either the end of the buffer or
 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
 * no trailing clean bytes are saved.
 * In case no dirty bits were found, or if CMMA was not enabled or used, the
 * output buffer will indicate 0 as length.
 */
static int kvm_s390_get_cmma_bits(struct kvm *kvm,
				  struct kvm_s390_cmma_log *args)
{
	unsigned long bufsize;
	int srcu_idx, peek, ret;
	u8 *values;

	if (!kvm->arch.use_cmma)
		return -ENXIO;
	/* Invalid/unsupported flags were specified */
	if (args->flags & ~KVM_S390_CMMA_PEEK)
		return -EINVAL;
	/* Migration mode query, and we are not doing a migration */
	peek = !!(args->flags & KVM_S390_CMMA_PEEK);
	if (!peek && !kvm->arch.migration_mode)
		return -EINVAL;
	/* CMMA is disabled or was not used, or the buffer has length zero */
	bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
	if (!bufsize || !kvm->mm->context.uses_cmm) {
		memset(args, 0, sizeof(*args));
		return 0;
	}
	/* We are not peeking, and there are no dirty pages */
	if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
		memset(args, 0, sizeof(*args));
		return 0;
	}

	values = vmalloc(bufsize);
	if (!values)
		return -ENOMEM;

	mmap_read_lock(kvm->mm);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	if (peek)
		ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
	else
		ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	mmap_read_unlock(kvm->mm);

	if (kvm->arch.migration_mode)
		args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
	else
		args->remaining = 0;

	if (copy_to_user((void __user *)args->values, values, args->count))
		ret = -EFAULT;

	vfree(values);
	return ret;
}

/*
 * This function sets the CMMA attributes for the given pages. If the input
 * buffer has zero length, no action is taken, otherwise the attributes are
 * set and the mm->context.uses_cmm flag is set.
 */
static int kvm_s390_set_cmma_bits(struct kvm *kvm,
				  const struct kvm_s390_cmma_log *args)
{
	unsigned long hva, mask, pgstev, i;
	uint8_t *bits;
	int srcu_idx, r = 0;

	mask = args->mask;

	if (!kvm->arch.use_cmma)
		return -ENXIO;
	/* invalid/unsupported flags */
	if (args->flags != 0)
		return -EINVAL;
	/* Enforce sane limit on memory allocation */
	if (args->count > KVM_S390_CMMA_SIZE_MAX)
		return -EINVAL;
	/* Nothing to do */
	if (args->count == 0)
		return 0;

	bits = vmalloc(array_size(sizeof(*bits), args->count));
	if (!bits)
		return -ENOMEM;

	r = copy_from_user(bits, (void __user *)args->values, args->count);
	if (r) {
		r = -EFAULT;
		goto out;
	}

	mmap_read_lock(kvm->mm);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}

		pgstev = bits[i];
		pgstev = pgstev << 24;
		mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
		set_pgste_bits(kvm->mm, hva, mask, pgstev);
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	mmap_read_unlock(kvm->mm);

	if (!kvm->mm->context.uses_cmm) {
		mmap_write_lock(kvm->mm);
		kvm->mm->context.uses_cmm = 1;
		mmap_write_unlock(kvm->mm);
	}
out:
	vfree(bits);
	return r;
}

/**
 * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to
 * non protected.
 * @kvm: the VM whose protected vCPUs are to be converted
 * @rc: return value for the RC field of the UVC (in case of error)
 * @rrc: return value for the RRC field of the UVC (in case of error)
 *
 * Does not stop in case of error, tries to convert as many
 * CPUs as possible. In case of error, the RC and RRC of the last error are
 * returned.
 *
 * Return: 0 in case of success, otherwise -EIO
 */
int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
{
	struct kvm_vcpu *vcpu;
	unsigned long i;
	u16 _rc, _rrc;
	int ret = 0;

	/*
	 * We ignore failures and try to destroy as many CPUs as possible.
	 * At the same time we must not free the assigned resources when
	 * this fails, as the ultravisor has still access to that memory.
	 * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak
	 * behind.
	 * We want to return the first failure rc and rrc, though.
	 */
	kvm_for_each_vcpu(i, vcpu, kvm) {
		mutex_lock(&vcpu->mutex);
		if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) {
			*rc = _rc;
			*rrc = _rrc;
			ret = -EIO;
		}
		mutex_unlock(&vcpu->mutex);
	}
	/* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */
	if (use_gisa)
		kvm_s390_gisa_enable(kvm);
	return ret;
}

/**
 * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM
 * to protected.
 * @kvm: the VM whose protected vCPUs are to be converted
 * @rc: return value for the RC field of the UVC (in case of error)
 * @rrc: return value for the RRC field of the UVC (in case of error)
 *
 * Tries to undo the conversion in case of error.
 *
 * Return: 0 in case of success, otherwise -EIO
 */
static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
{
	unsigned long i;
	int r = 0;
	u16 dummy;

	struct kvm_vcpu *vcpu;

	/* Disable the GISA if the ultravisor does not support AIV. */
	if (!test_bit_inv(BIT_UV_FEAT_AIV, &uv_info.uv_feature_indications))
		kvm_s390_gisa_disable(kvm);

	kvm_for_each_vcpu(i, vcpu, kvm) {
		mutex_lock(&vcpu->mutex);
		r = kvm_s390_pv_create_cpu(vcpu, rc, rrc);
		mutex_unlock(&vcpu->mutex);
		if (r)
			break;
	}
	if (r)
		kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
	return r;
}

/*
 * Here we provide user space with a direct interface to query UV
 * related data like UV maxima and available features as well as
 * feature specific data.
 *
 * To facilitate future extension of the data structures we'll try to
 * write data up to the maximum requested length.
 */
static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info)
{
	ssize_t len_min;

	switch (info->header.id) {
	case KVM_PV_INFO_VM: {
		len_min =  sizeof(info->header) + sizeof(info->vm);

		if (info->header.len_max < len_min)
			return -EINVAL;

		memcpy(info->vm.inst_calls_list,
		       uv_info.inst_calls_list,
		       sizeof(uv_info.inst_calls_list));

		/* It's max cpuid not max cpus, so it's off by one */
		info->vm.max_cpus = uv_info.max_guest_cpu_id + 1;
		info->vm.max_guests = uv_info.max_num_sec_conf;
		info->vm.max_guest_addr = uv_info.max_sec_stor_addr;
		info->vm.feature_indication = uv_info.uv_feature_indications;

		return len_min;
	}
	case KVM_PV_INFO_DUMP: {
		len_min =  sizeof(info->header) + sizeof(info->dump);

		if (info->header.len_max < len_min)
			return -EINVAL;

		info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len;
		info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len;
		info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len;
		return len_min;
	}
	default:
		return -EINVAL;
	}
}

static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd,
			   struct kvm_s390_pv_dmp dmp)
{
	int r = -EINVAL;
	void __user *result_buff = (void __user *)dmp.buff_addr;

	switch (dmp.subcmd) {
	case KVM_PV_DUMP_INIT: {
		if (kvm->arch.pv.dumping)
			break;

		/*
		 * Block SIE entry as concurrent dump UVCs could lead
		 * to validities.
		 */
		kvm_s390_vcpu_block_all(kvm);

		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
				  UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc);
		KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x",
			     cmd->rc, cmd->rrc);
		if (!r) {
			kvm->arch.pv.dumping = true;
		} else {
			kvm_s390_vcpu_unblock_all(kvm);
			r = -EINVAL;
		}
		break;
	}
	case KVM_PV_DUMP_CONFIG_STOR_STATE: {
		if (!kvm->arch.pv.dumping)
			break;

		/*
		 * gaddr is an output parameter since we might stop
		 * early. As dmp will be copied back in our caller, we
		 * don't need to do it ourselves.
		 */
		r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len,
						&cmd->rc, &cmd->rrc);
		break;
	}
	case KVM_PV_DUMP_COMPLETE: {
		if (!kvm->arch.pv.dumping)
			break;

		r = -EINVAL;
		if (dmp.buff_len < uv_info.conf_dump_finalize_len)
			break;

		r = kvm_s390_pv_dump_complete(kvm, result_buff,
					      &cmd->rc, &cmd->rrc);
		break;
	}
	default:
		r = -ENOTTY;
		break;
	}

	return r;
}

static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
{
	int r = 0;
	u16 dummy;
	void __user *argp = (void __user *)cmd->data;

	switch (cmd->cmd) {
	case KVM_PV_ENABLE: {
		r = -EINVAL;
		if (kvm_s390_pv_is_protected(kvm))
			break;

		/*
		 *  FMT 4 SIE needs esca. As we never switch back to bsca from
		 *  esca, we need no cleanup in the error cases below
		 */
		r = sca_switch_to_extended(kvm);
		if (r)
			break;

		mmap_write_lock(current->mm);
		r = gmap_mark_unmergeable();
		mmap_write_unlock(current->mm);
		if (r)
			break;

		r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc);
		if (r)
			break;

		r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc);
		if (r)
			kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);

		/* we need to block service interrupts from now on */
		set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
		break;
	}
	case KVM_PV_DISABLE: {
		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm))
			break;

		r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
		/*
		 * If a CPU could not be destroyed, destroy VM will also fail.
		 * There is no point in trying to destroy it. Instead return
		 * the rc and rrc from the first CPU that failed destroying.
		 */
		if (r)
			break;
		r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc);

		/* no need to block service interrupts any more */
		clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
		break;
	}
	case KVM_PV_SET_SEC_PARMS: {
		struct kvm_s390_pv_sec_parm parms = {};
		void *hdr;

		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm))
			break;

		r = -EFAULT;
		if (copy_from_user(&parms, argp, sizeof(parms)))
			break;

		/* Currently restricted to 8KB */
		r = -EINVAL;
		if (parms.length > PAGE_SIZE * 2)
			break;

		r = -ENOMEM;
		hdr = vmalloc(parms.length);
		if (!hdr)
			break;

		r = -EFAULT;
		if (!copy_from_user(hdr, (void __user *)parms.origin,
				    parms.length))
			r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length,
						      &cmd->rc, &cmd->rrc);

		vfree(hdr);
		break;
	}
	case KVM_PV_UNPACK: {
		struct kvm_s390_pv_unp unp = {};

		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm))
			break;

		r = -EFAULT;
		if (copy_from_user(&unp, argp, sizeof(unp)))
			break;

		r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak,
				       &cmd->rc, &cmd->rrc);
		break;
	}
	case KVM_PV_VERIFY: {
		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm))
			break;

		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
				  UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc);
		KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc,
			     cmd->rrc);
		break;
	}
	case KVM_PV_PREP_RESET: {
		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm))
			break;

		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
				  UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc);
		KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x",
			     cmd->rc, cmd->rrc);
		break;
	}
	case KVM_PV_UNSHARE_ALL: {
		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm))
			break;

		r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
				  UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc);
		KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x",
			     cmd->rc, cmd->rrc);
		break;
	}
	case KVM_PV_INFO: {
		struct kvm_s390_pv_info info = {};
		ssize_t data_len;

		/*
		 * No need to check the VM protection here.
		 *
		 * Maybe user space wants to query some of the data
		 * when the VM is still unprotected. If we see the
		 * need to fence a new data command we can still
		 * return an error in the info handler.
		 */

		r = -EFAULT;
		if (copy_from_user(&info, argp, sizeof(info.header)))
			break;

		r = -EINVAL;
		if (info.header.len_max < sizeof(info.header))
			break;

		data_len = kvm_s390_handle_pv_info(&info);
		if (data_len < 0) {
			r = data_len;
			break;
		}
		/*
		 * If a data command struct is extended (multiple
		 * times) this can be used to determine how much of it
		 * is valid.
		 */
		info.header.len_written = data_len;

		r = -EFAULT;
		if (copy_to_user(argp, &info, data_len))
			break;

		r = 0;
		break;
	}
	case KVM_PV_DUMP: {
		struct kvm_s390_pv_dmp dmp;

		r = -EINVAL;
		if (!kvm_s390_pv_is_protected(kvm))
			break;

		r = -EFAULT;
		if (copy_from_user(&dmp, argp, sizeof(dmp)))
			break;

		r = kvm_s390_pv_dmp(kvm, cmd, dmp);
		if (r)
			break;

		if (copy_to_user(argp, &dmp, sizeof(dmp))) {
			r = -EFAULT;
			break;
		}

		break;
	}
	default:
		r = -ENOTTY;
	}
	return r;
}

static bool access_key_invalid(u8 access_key)
{
	return access_key > 0xf;
}

static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
{
	void __user *uaddr = (void __user *)mop->buf;
	u64 supported_flags;
	void *tmpbuf = NULL;
	int r, srcu_idx;

	supported_flags = KVM_S390_MEMOP_F_SKEY_PROTECTION
			  | KVM_S390_MEMOP_F_CHECK_ONLY;
	if (mop->flags & ~supported_flags || !mop->size)
		return -EINVAL;
	if (mop->size > MEM_OP_MAX_SIZE)
		return -E2BIG;
	/*
	 * This is technically a heuristic only, if the kvm->lock is not
	 * taken, it is not guaranteed that the vm is/remains non-protected.
	 * This is ok from a kernel perspective, wrongdoing is detected
	 * on the access, -EFAULT is returned and the vm may crash the
	 * next time it accesses the memory in question.
	 * There is no sane usecase to do switching and a memop on two
	 * different CPUs at the same time.
	 */
	if (kvm_s390_pv_get_handle(kvm))
		return -EINVAL;
	if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
		if (access_key_invalid(mop->key))
			return -EINVAL;
	} else {
		mop->key = 0;
	}
	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
		tmpbuf = vmalloc(mop->size);
		if (!tmpbuf)
			return -ENOMEM;
	}

	srcu_idx = srcu_read_lock(&kvm->srcu);

	if (kvm_is_error_gpa(kvm, mop->gaddr)) {
		r = PGM_ADDRESSING;
		goto out_unlock;
	}

	switch (mop->op) {
	case KVM_S390_MEMOP_ABSOLUTE_READ: {
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
			r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_FETCH, mop->key);
		} else {
			r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
						      mop->size, GACC_FETCH, mop->key);
			if (r == 0) {
				if (copy_to_user(uaddr, tmpbuf, mop->size))
					r = -EFAULT;
			}
		}
		break;
	}
	case KVM_S390_MEMOP_ABSOLUTE_WRITE: {
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
			r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_STORE, mop->key);
		} else {
			if (copy_from_user(tmpbuf, uaddr, mop->size)) {
				r = -EFAULT;
				break;
			}
			r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
						      mop->size, GACC_STORE, mop->key);
		}
		break;
	}
	default:
		r = -EINVAL;
	}

out_unlock:
	srcu_read_unlock(&kvm->srcu, srcu_idx);

	vfree(tmpbuf);
	return r;
}

long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;
	struct kvm_device_attr attr;
	int r;

	switch (ioctl) {
	case KVM_S390_INTERRUPT: {
		struct kvm_s390_interrupt s390int;

		r = -EFAULT;
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
			break;
		r = kvm_s390_inject_vm(kvm, &s390int);
		break;
	}
	case KVM_CREATE_IRQCHIP: {
		struct kvm_irq_routing_entry routing;

		r = -EINVAL;
		if (kvm->arch.use_irqchip) {
			/* Set up dummy routing. */
			memset(&routing, 0, sizeof(routing));
			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
		}
		break;
	}
	case KVM_SET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_set_attr(kvm, &attr);
		break;
	}
	case KVM_GET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_get_attr(kvm, &attr);
		break;
	}
	case KVM_HAS_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_has_attr(kvm, &attr);
		break;
	}
	case KVM_S390_GET_SKEYS: {
		struct kvm_s390_skeys args;

		r = -EFAULT;
		if (copy_from_user(&args, argp,
				   sizeof(struct kvm_s390_skeys)))
			break;
		r = kvm_s390_get_skeys(kvm, &args);
		break;
	}
	case KVM_S390_SET_SKEYS: {
		struct kvm_s390_skeys args;

		r = -EFAULT;
		if (copy_from_user(&args, argp,
				   sizeof(struct kvm_s390_skeys)))
			break;
		r = kvm_s390_set_skeys(kvm, &args);
		break;
	}
	case KVM_S390_GET_CMMA_BITS: {
		struct kvm_s390_cmma_log args;

		r = -EFAULT;
		if (copy_from_user(&args, argp, sizeof(args)))
			break;
		mutex_lock(&kvm->slots_lock);
		r = kvm_s390_get_cmma_bits(kvm, &args);
		mutex_unlock(&kvm->slots_lock);
		if (!r) {
			r = copy_to_user(argp, &args, sizeof(args));
			if (r)
				r = -EFAULT;
		}
		break;
	}
	case KVM_S390_SET_CMMA_BITS: {
		struct kvm_s390_cmma_log args;

		r = -EFAULT;
		if (copy_from_user(&args, argp, sizeof(args)))
			break;
		mutex_lock(&kvm->slots_lock);
		r = kvm_s390_set_cmma_bits(kvm, &args);
		mutex_unlock(&kvm->slots_lock);
		break;
	}
	case KVM_S390_PV_COMMAND: {
		struct kvm_pv_cmd args;

		/* protvirt means user cpu state */
		kvm_s390_set_user_cpu_state_ctrl(kvm);
		r = 0;
		if (!is_prot_virt_host()) {
			r = -EINVAL;
			break;
		}
		if (copy_from_user(&args, argp, sizeof(args))) {
			r = -EFAULT;
			break;
		}
		if (args.flags) {
			r = -EINVAL;
			break;
		}
		mutex_lock(&kvm->lock);
		r = kvm_s390_handle_pv(kvm, &args);
		mutex_unlock(&kvm->lock);
		if (copy_to_user(argp, &args, sizeof(args))) {
			r = -EFAULT;
			break;
		}
		break;
	}
	case KVM_S390_MEM_OP: {
		struct kvm_s390_mem_op mem_op;

		if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
			r = kvm_s390_vm_mem_op(kvm, &mem_op);
		else
			r = -EFAULT;
		break;
	}
	case KVM_S390_ZPCI_OP: {
		struct kvm_s390_zpci_op args;

		r = -EINVAL;
		if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
			break;
		if (copy_from_user(&args, argp, sizeof(args))) {
			r = -EFAULT;
			break;
		}
		r = kvm_s390_pci_zpci_op(kvm, &args);
		break;
	}
	default:
		r = -ENOTTY;
	}

	return r;
}

static int kvm_s390_apxa_installed(void)
{
	struct ap_config_info info;

	if (ap_instructions_available()) {
		if (ap_qci(&info) == 0)
			return info.apxa;
	}

	return 0;
}

/*
 * The format of the crypto control block (CRYCB) is specified in the 3 low
 * order bits of the CRYCB designation (CRYCBD) field as follows:
 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
 *	     AP extended addressing (APXA) facility are installed.
 * Format 1: The APXA facility is not installed but the MSAX3 facility is.
 * Format 2: Both the APXA and MSAX3 facilities are installed
 */
static void kvm_s390_set_crycb_format(struct kvm *kvm)
{
	kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;

	/* Clear the CRYCB format bits - i.e., set format 0 by default */
	kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);

	/* Check whether MSAX3 is installed */
	if (!test_kvm_facility(kvm, 76))
		return;

	if (kvm_s390_apxa_installed())
		kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
	else
		kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}

/*
 * kvm_arch_crypto_set_masks
 *
 * @kvm: pointer to the target guest's KVM struct containing the crypto masks
 *	 to be set.
 * @apm: the mask identifying the accessible AP adapters
 * @aqm: the mask identifying the accessible AP domains
 * @adm: the mask identifying the accessible AP control domains
 *
 * Set the masks that identify the adapters, domains and control domains to
 * which the KVM guest is granted access.
 *
 * Note: The kvm->lock mutex must be locked by the caller before invoking this
 *	 function.
 */
void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
			       unsigned long *aqm, unsigned long *adm)
{
	struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;

	kvm_s390_vcpu_block_all(kvm);

	switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
	case CRYCB_FORMAT2: /* APCB1 use 256 bits */
		memcpy(crycb->apcb1.apm, apm, 32);
		VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
			 apm[0], apm[1], apm[2], apm[3]);
		memcpy(crycb->apcb1.aqm, aqm, 32);
		VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
			 aqm[0], aqm[1], aqm[2], aqm[3]);
		memcpy(crycb->apcb1.adm, adm, 32);
		VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
			 adm[0], adm[1], adm[2], adm[3]);
		break;
	case CRYCB_FORMAT1:
	case CRYCB_FORMAT0: /* Fall through both use APCB0 */
		memcpy(crycb->apcb0.apm, apm, 8);
		memcpy(crycb->apcb0.aqm, aqm, 2);
		memcpy(crycb->apcb0.adm, adm, 2);
		VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
			 apm[0], *((unsigned short *)aqm),
			 *((unsigned short *)adm));
		break;
	default:	/* Can not happen */
		break;
	}

	/* recreate the shadow crycb for each vcpu */
	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
	kvm_s390_vcpu_unblock_all(kvm);
}
EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);

/*
 * kvm_arch_crypto_clear_masks
 *
 * @kvm: pointer to the target guest's KVM struct containing the crypto masks
 *	 to be cleared.
 *
 * Clear the masks that identify the adapters, domains and control domains to
 * which the KVM guest is granted access.
 *
 * Note: The kvm->lock mutex must be locked by the caller before invoking this
 *	 function.
 */
void kvm_arch_crypto_clear_masks(struct kvm *kvm)
{
	kvm_s390_vcpu_block_all(kvm);

	memset(&kvm->arch.crypto.crycb->apcb0, 0,
	       sizeof(kvm->arch.crypto.crycb->apcb0));
	memset(&kvm->arch.crypto.crycb->apcb1, 0,
	       sizeof(kvm->arch.crypto.crycb->apcb1));

	VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
	/* recreate the shadow crycb for each vcpu */
	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
	kvm_s390_vcpu_unblock_all(kvm);
}
EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);

static u64 kvm_s390_get_initial_cpuid(void)
{
	struct cpuid cpuid;

	get_cpu_id(&cpuid);
	cpuid.version = 0xff;
	return *((u64 *) &cpuid);
}

static void kvm_s390_crypto_init(struct kvm *kvm)
{
	kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
	kvm_s390_set_crycb_format(kvm);
	init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem);

	if (!test_kvm_facility(kvm, 76))
		return;

	/* Enable AES/DEA protected key functions by default */
	kvm->arch.crypto.aes_kw = 1;
	kvm->arch.crypto.dea_kw = 1;
	get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
			 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
	get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
			 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
}

static void sca_dispose(struct kvm *kvm)
{
	if (kvm->arch.use_esca)
		free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
	else
		free_page((unsigned long)(kvm->arch.sca));
	kvm->arch.sca = NULL;
}

void kvm_arch_free_vm(struct kvm *kvm)
{
	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
		kvm_s390_pci_clear_list(kvm);

	__kvm_arch_free_vm(kvm);
}

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
	gfp_t alloc_flags = GFP_KERNEL_ACCOUNT;
	int i, rc;
	char debug_name[16];
	static unsigned long sca_offset;

	rc = -EINVAL;
#ifdef CONFIG_KVM_S390_UCONTROL
	if (type & ~KVM_VM_S390_UCONTROL)
		goto out_err;
	if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
		goto out_err;
#else
	if (type)
		goto out_err;
#endif

	rc = s390_enable_sie();
	if (rc)
		goto out_err;

	rc = -ENOMEM;

	if (!sclp.has_64bscao)
		alloc_flags |= GFP_DMA;
	rwlock_init(&kvm->arch.sca_lock);
	/* start with basic SCA */
	kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
	if (!kvm->arch.sca)
		goto out_err;
	mutex_lock(&kvm_lock);
	sca_offset += 16;
	if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
		sca_offset = 0;
	kvm->arch.sca = (struct bsca_block *)
			((char *) kvm->arch.sca + sca_offset);
	mutex_unlock(&kvm_lock);

	sprintf(debug_name, "kvm-%u", current->pid);

	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
	if (!kvm->arch.dbf)
		goto out_err;

	BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
	kvm->arch.sie_page2 =
	     (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
	if (!kvm->arch.sie_page2)
		goto out_err;

	kvm->arch.sie_page2->kvm = kvm;
	kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;

	for (i = 0; i < kvm_s390_fac_size(); i++) {
		kvm->arch.model.fac_mask[i] = stfle_fac_list[i] &
					      (kvm_s390_fac_base[i] |
					       kvm_s390_fac_ext[i]);
		kvm->arch.model.fac_list[i] = stfle_fac_list[i] &
					      kvm_s390_fac_base[i];
	}
	kvm->arch.model.subfuncs = kvm_s390_available_subfunc;

	/* we are always in czam mode - even on pre z14 machines */
	set_kvm_facility(kvm->arch.model.fac_mask, 138);
	set_kvm_facility(kvm->arch.model.fac_list, 138);
	/* we emulate STHYI in kvm */
	set_kvm_facility(kvm->arch.model.fac_mask, 74);
	set_kvm_facility(kvm->arch.model.fac_list, 74);
	if (MACHINE_HAS_TLB_GUEST) {
		set_kvm_facility(kvm->arch.model.fac_mask, 147);
		set_kvm_facility(kvm->arch.model.fac_list, 147);
	}

	if (css_general_characteristics.aiv && test_facility(65))
		set_kvm_facility(kvm->arch.model.fac_mask, 65);

	kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
	kvm->arch.model.ibc = sclp.ibc & 0x0fff;

	kvm_s390_crypto_init(kvm);

	if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
		mutex_lock(&kvm->lock);
		kvm_s390_pci_init_list(kvm);
		kvm_s390_vcpu_pci_enable_interp(kvm);
		mutex_unlock(&kvm->lock);
	}

	mutex_init(&kvm->arch.float_int.ais_lock);
	spin_lock_init(&kvm->arch.float_int.lock);
	for (i = 0; i < FIRQ_LIST_COUNT; i++)
		INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
	init_waitqueue_head(&kvm->arch.ipte_wq);
	mutex_init(&kvm->arch.ipte_mutex);

	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
	VM_EVENT(kvm, 3, "vm created with type %lu", type);

	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
		kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
	} else {
		if (sclp.hamax == U64_MAX)
			kvm->arch.mem_limit = TASK_SIZE_MAX;
		else
			kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
						    sclp.hamax + 1);
		kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
		if (!kvm->arch.gmap)
			goto out_err;
		kvm->arch.gmap->private = kvm;
		kvm->arch.gmap->pfault_enabled = 0;
	}

	kvm->arch.use_pfmfi = sclp.has_pfmfi;
	kvm->arch.use_skf = sclp.has_skey;
	spin_lock_init(&kvm->arch.start_stop_lock);
	kvm_s390_vsie_init(kvm);
	if (use_gisa)
		kvm_s390_gisa_init(kvm);
	KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);

	return 0;
out_err:
	free_page((unsigned long)kvm->arch.sie_page2);
	debug_unregister(kvm->arch.dbf);
	sca_dispose(kvm);
	KVM_EVENT(3, "creation of vm failed: %d", rc);
	return rc;
}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	u16 rc, rrc;

	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
	kvm_s390_clear_local_irqs(vcpu);
	kvm_clear_async_pf_completion_queue(vcpu);
	if (!kvm_is_ucontrol(vcpu->kvm))
		sca_del_vcpu(vcpu);

	if (kvm_is_ucontrol(vcpu->kvm))
		gmap_remove(vcpu->arch.gmap);

	if (vcpu->kvm->arch.use_cmma)
		kvm_s390_vcpu_unsetup_cmma(vcpu);
	/* We can not hold the vcpu mutex here, we are already dying */
	if (kvm_s390_pv_cpu_get_handle(vcpu))
		kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc);
	free_page((unsigned long)(vcpu->arch.sie_block));
}

void kvm_arch_destroy_vm(struct kvm *kvm)
{
	u16 rc, rrc;

	kvm_destroy_vcpus(kvm);
	sca_dispose(kvm);
	kvm_s390_gisa_destroy(kvm);
	/*
	 * We are already at the end of life and kvm->lock is not taken.
	 * This is ok as the file descriptor is closed by now and nobody
	 * can mess with the pv state. To avoid lockdep_assert_held from
	 * complaining we do not use kvm_s390_pv_is_protected.
	 */
	if (kvm_s390_pv_get_handle(kvm))
		kvm_s390_pv_deinit_vm(kvm, &rc, &rrc);
	debug_unregister(kvm->arch.dbf);
	free_page((unsigned long)kvm->arch.sie_page2);
	if (!kvm_is_ucontrol(kvm))
		gmap_remove(kvm->arch.gmap);
	kvm_s390_destroy_adapters(kvm);
	kvm_s390_clear_float_irqs(kvm);
	kvm_s390_vsie_destroy(kvm);
	KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
}

/* Section: vcpu related */
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
	vcpu->arch.gmap = gmap_create(current->mm, -1UL);
	if (!vcpu->arch.gmap)
		return -ENOMEM;
	vcpu->arch.gmap->private = vcpu->kvm;

	return 0;
}

static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
	if (!kvm_s390_use_sca_entries())
		return;
	read_lock(&vcpu->kvm->arch.sca_lock);
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;

		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
		sca->cpu[vcpu->vcpu_id].sda = 0;
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
		sca->cpu[vcpu->vcpu_id].sda = 0;
	}
	read_unlock(&vcpu->kvm->arch.sca_lock);
}

static void sca_add_vcpu(struct kvm_vcpu *vcpu)
{
	if (!kvm_s390_use_sca_entries()) {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		/* we still need the basic sca for the ipte control */
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
		return;
	}
	read_lock(&vcpu->kvm->arch.sca_lock);
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;

		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
	}
	read_unlock(&vcpu->kvm->arch.sca_lock);
}

/* Basic SCA to Extended SCA data copy routines */
static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
{
	d->sda = s->sda;
	d->sigp_ctrl.c = s->sigp_ctrl.c;
	d->sigp_ctrl.scn = s->sigp_ctrl.scn;
}

static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
{
	int i;

	d->ipte_control = s->ipte_control;
	d->mcn[0] = s->mcn;
	for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
		sca_copy_entry(&d->cpu[i], &s->cpu[i]);
}

static int sca_switch_to_extended(struct kvm *kvm)
{
	struct bsca_block *old_sca = kvm->arch.sca;
	struct esca_block *new_sca;
	struct kvm_vcpu *vcpu;
	unsigned long vcpu_idx;
	u32 scaol, scaoh;

	if (kvm->arch.use_esca)
		return 0;

	new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL_ACCOUNT | __GFP_ZERO);
	if (!new_sca)
		return -ENOMEM;

	scaoh = (u32)((u64)(new_sca) >> 32);
	scaol = (u32)(u64)(new_sca) & ~0x3fU;

	kvm_s390_vcpu_block_all(kvm);
	write_lock(&kvm->arch.sca_lock);

	sca_copy_b_to_e(new_sca, old_sca);

	kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
		vcpu->arch.sie_block->scaoh = scaoh;
		vcpu->arch.sie_block->scaol = scaol;
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
	}
	kvm->arch.sca = new_sca;
	kvm->arch.use_esca = 1;

	write_unlock(&kvm->arch.sca_lock);
	kvm_s390_vcpu_unblock_all(kvm);

	free_page((unsigned long)old_sca);

	VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
		 old_sca, kvm->arch.sca);
	return 0;
}

static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
{
	int rc;

	if (!kvm_s390_use_sca_entries()) {
		if (id < KVM_MAX_VCPUS)
			return true;
		return false;
	}
	if (id < KVM_S390_BSCA_CPU_SLOTS)
		return true;
	if (!sclp.has_esca || !sclp.has_64bscao)
		return false;

	rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);

	return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
	vcpu->arch.cputm_start = get_tod_clock_fast();
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
	vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	vcpu->arch.cputm_start = 0;
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_enabled);
	vcpu->arch.cputm_enabled = true;
	__start_cpu_timer_accounting(vcpu);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
	__stop_cpu_timer_accounting(vcpu);
	vcpu->arch.cputm_enabled = false;
}

static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	__enable_cpu_timer_accounting(vcpu);
	preempt_enable();
}

static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	__disable_cpu_timer_accounting(vcpu);
	preempt_enable();
}

/* set the cpu timer - may only be called from the VCPU thread itself */
void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
	if (vcpu->arch.cputm_enabled)
		vcpu->arch.cputm_start = get_tod_clock_fast();
	vcpu->arch.sie_block->cputm = cputm;
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
	preempt_enable();
}

/* update and get the cpu timer - can also be called from other VCPU threads */
__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
{
	unsigned int seq;
	__u64 value;

	if (unlikely(!vcpu->arch.cputm_enabled))
		return vcpu->arch.sie_block->cputm;

	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	do {
		seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
		/*
		 * If the writer would ever execute a read in the critical
		 * section, e.g. in irq context, we have a deadlock.
		 */
		WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
		value = vcpu->arch.sie_block->cputm;
		/* if cputm_start is 0, accounting is being started/stopped */
		if (likely(vcpu->arch.cputm_start))
			value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	} while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
	preempt_enable();
	return value;
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{

	gmap_enable(vcpu->arch.enabled_gmap);
	kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
		__start_cpu_timer_accounting(vcpu);
	vcpu->cpu = cpu;
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
	vcpu->cpu = -1;
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
		__stop_cpu_timer_accounting(vcpu);
	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
	vcpu->arch.enabled_gmap = gmap_get_enabled();
	gmap_disable(vcpu->arch.enabled_gmap);

}

void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
	mutex_lock(&vcpu->kvm->lock);
	preempt_disable();
	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
	vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
	preempt_enable();
	mutex_unlock(&vcpu->kvm->lock);
	if (!kvm_is_ucontrol(vcpu->kvm)) {
		vcpu->arch.gmap = vcpu->kvm->arch.gmap;
		sca_add_vcpu(vcpu);
	}
	if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
	/* make vcpu_load load the right gmap on the first trigger */
	vcpu->arch.enabled_gmap = vcpu->arch.gmap;
}

static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
{
	if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
	    test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
		return true;
	return false;
}

static bool kvm_has_pckmo_ecc(struct kvm *kvm)
{
	/* At least one ECC subfunction must be present */
	return kvm_has_pckmo_subfunc(kvm, 32) ||
	       kvm_has_pckmo_subfunc(kvm, 33) ||
	       kvm_has_pckmo_subfunc(kvm, 34) ||
	       kvm_has_pckmo_subfunc(kvm, 40) ||
	       kvm_has_pckmo_subfunc(kvm, 41);

}

static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
	/*
	 * If the AP instructions are not being interpreted and the MSAX3
	 * facility is not configured for the guest, there is nothing to set up.
	 */
	if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
		return;

	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
	vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
	vcpu->arch.sie_block->eca &= ~ECA_APIE;
	vcpu->arch.sie_block->ecd &= ~ECD_ECC;

	if (vcpu->kvm->arch.crypto.apie)
		vcpu->arch.sie_block->eca |= ECA_APIE;

	/* Set up protected key support */
	if (vcpu->kvm->arch.crypto.aes_kw) {
		vcpu->arch.sie_block->ecb3 |= ECB3_AES;
		/* ecc is also wrapped with AES key */
		if (kvm_has_pckmo_ecc(vcpu->kvm))
			vcpu->arch.sie_block->ecd |= ECD_ECC;
	}

	if (vcpu->kvm->arch.crypto.dea_kw)
		vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
}

void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
{
	free_page(vcpu->arch.sie_block->cbrlo);
	vcpu->arch.sie_block->cbrlo = 0;
}

int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
{
	vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL_ACCOUNT);
	if (!vcpu->arch.sie_block->cbrlo)
		return -ENOMEM;
	return 0;
}

static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;

	vcpu->arch.sie_block->ibc = model->ibc;
	if (test_kvm_facility(vcpu->kvm, 7))
		vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
}

static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
{
	int rc = 0;
	u16 uvrc, uvrrc;

	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
						    CPUSTAT_STOPPED);

	if (test_kvm_facility(vcpu->kvm, 78))
		kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
	else if (test_kvm_facility(vcpu->kvm, 8))
		kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);

	kvm_s390_vcpu_setup_model(vcpu);

	/* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
	if (MACHINE_HAS_ESOP)
		vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
	if (test_kvm_facility(vcpu->kvm, 9))
		vcpu->arch.sie_block->ecb |= ECB_SRSI;
	if (test_kvm_facility(vcpu->kvm, 73))
		vcpu->arch.sie_block->ecb |= ECB_TE;
	if (!kvm_is_ucontrol(vcpu->kvm))
		vcpu->arch.sie_block->ecb |= ECB_SPECI;

	if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
		vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
	if (test_kvm_facility(vcpu->kvm, 130))
		vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
	vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
	if (sclp.has_cei)
		vcpu->arch.sie_block->eca |= ECA_CEI;
	if (sclp.has_ib)
		vcpu->arch.sie_block->eca |= ECA_IB;
	if (sclp.has_siif)
		vcpu->arch.sie_block->eca |= ECA_SII;
	if (sclp.has_sigpif)
		vcpu->arch.sie_block->eca |= ECA_SIGPI;
	if (test_kvm_facility(vcpu->kvm, 129)) {
		vcpu->arch.sie_block->eca |= ECA_VX;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
	}
	if (test_kvm_facility(vcpu->kvm, 139))
		vcpu->arch.sie_block->ecd |= ECD_MEF;
	if (test_kvm_facility(vcpu->kvm, 156))
		vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
	if (vcpu->arch.sie_block->gd) {
		vcpu->arch.sie_block->eca |= ECA_AIV;
		VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
			   vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
	}
	vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
					| SDNXC;
	vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;

	if (sclp.has_kss)
		kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
	else
		vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;

	if (vcpu->kvm->arch.use_cmma) {
		rc = kvm_s390_vcpu_setup_cmma(vcpu);
		if (rc)
			return rc;
	}
	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;

	vcpu->arch.sie_block->hpid = HPID_KVM;

	kvm_s390_vcpu_crypto_setup(vcpu);

	kvm_s390_vcpu_pci_setup(vcpu);

	mutex_lock(&vcpu->kvm->lock);
	if (kvm_s390_pv_is_protected(vcpu->kvm)) {
		rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);
		if (rc)
			kvm_s390_vcpu_unsetup_cmma(vcpu);
	}
	mutex_unlock(&vcpu->kvm->lock);

	return rc;
}

int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
		return -EINVAL;
	return 0;
}

int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
	struct sie_page *sie_page;
	int rc;

	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);
	if (!sie_page)
		return -ENOMEM;

	vcpu->arch.sie_block = &sie_page->sie_block;
	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;

	/* the real guest size will always be smaller than msl */
	vcpu->arch.sie_block->mso = 0;
	vcpu->arch.sie_block->msl = sclp.hamax;

	vcpu->arch.sie_block->icpua = vcpu->vcpu_id;
	spin_lock_init(&vcpu->arch.local_int.lock);
	vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm);
	seqcount_init(&vcpu->arch.cputm_seqcount);

	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
				    KVM_SYNC_ACRS |
				    KVM_SYNC_CRS |
				    KVM_SYNC_ARCH0 |
				    KVM_SYNC_PFAULT |
				    KVM_SYNC_DIAG318;
	kvm_s390_set_prefix(vcpu, 0);
	if (test_kvm_facility(vcpu->kvm, 64))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
	if (test_kvm_facility(vcpu->kvm, 82))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
	if (test_kvm_facility(vcpu->kvm, 133))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
	if (test_kvm_facility(vcpu->kvm, 156))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
	/* fprs can be synchronized via vrs, even if the guest has no vx. With
	 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
	 */
	if (MACHINE_HAS_VX)
		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
	else
		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;

	if (kvm_is_ucontrol(vcpu->kvm)) {
		rc = __kvm_ucontrol_vcpu_init(vcpu);
		if (rc)
			goto out_free_sie_block;
	}

	VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK",
		 vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
	trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);

	rc = kvm_s390_vcpu_setup(vcpu);
	if (rc)
		goto out_ucontrol_uninit;
	return 0;

out_ucontrol_uninit:
	if (kvm_is_ucontrol(vcpu->kvm))
		gmap_remove(vcpu->arch.gmap);
out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
	return rc;
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
	clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
	return kvm_s390_vcpu_has_irq(vcpu, 0);
}

bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
}

void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
{
	atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
	exit_sie(vcpu);
}

void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
{
	atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
}

static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
{
	atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
	exit_sie(vcpu);
}

bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
{
	return atomic_read(&vcpu->arch.sie_block->prog20) &
	       (PROG_BLOCK_SIE | PROG_REQUEST);
}

static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
{
	atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
}

/*
 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
 * If the CPU is not running (e.g. waiting as idle) the function will
 * return immediately. */
void exit_sie(struct kvm_vcpu *vcpu)
{
	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
	kvm_s390_vsie_kick(vcpu);
	while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
		cpu_relax();
}

/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
{
	__kvm_make_request(req, vcpu);
	kvm_s390_vcpu_request(vcpu);
}

static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end)
{
	struct kvm *kvm = gmap->private;
	struct kvm_vcpu *vcpu;
	unsigned long prefix;
	unsigned long i;

	if (gmap_is_shadow(gmap))
		return;
	if (start >= 1UL << 31)
		/* We are only interested in prefix pages */
		return;
	kvm_for_each_vcpu(i, vcpu, kvm) {
		/* match against both prefix pages */
		prefix = kvm_s390_get_prefix(vcpu);
		if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
			VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
				   start, end);
			kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
		}
	}
}

bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
{
	/* do not poll with more than halt_poll_max_steal percent of steal time */
	if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
	    READ_ONCE(halt_poll_max_steal)) {
		vcpu->stat.halt_no_poll_steal++;
		return true;
	}
	return false;
}

int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
	case KVM_REG_S390_TODPR:
		r = put_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = put_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CPU_TIMER:
		r = put_user(kvm_s390_get_cpu_timer(vcpu),
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = put_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFTOKEN:
		r = put_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFCOMPARE:
		r = put_user(vcpu->arch.pfault_compare,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFSELECT:
		r = put_user(vcpu->arch.pfault_select,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PP:
		r = put_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_GBEA:
		r = put_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
	default:
		break;
	}

	return r;
}

static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;
	__u64 val;

	switch (reg->id) {
	case KVM_REG_S390_TODPR:
		r = get_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = get_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CPU_TIMER:
		r = get_user(val, (u64 __user *)reg->addr);
		if (!r)
			kvm_s390_set_cpu_timer(vcpu, val);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = get_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFTOKEN:
		r = get_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
		break;
	case KVM_REG_S390_PFCOMPARE:
		r = get_user(vcpu->arch.pfault_compare,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFSELECT:
		r = get_user(vcpu->arch.pfault_select,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PP:
		r = get_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_GBEA:
		r = get_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
	default:
		break;
	}

	return r;
}

static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)
{
	vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI;
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb));

	kvm_clear_async_pf_completion_queue(vcpu);
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
		kvm_s390_vcpu_stop(vcpu);
	kvm_s390_clear_local_irqs(vcpu);
}

static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
{
	/* Initial reset is a superset of the normal reset */
	kvm_arch_vcpu_ioctl_normal_reset(vcpu);

	/*
	 * This equals initial cpu reset in pop, but we don't switch to ESA.
	 * We do not only reset the internal data, but also ...
	 */
	vcpu->arch.sie_block->gpsw.mask = 0;
	vcpu->arch.sie_block->gpsw.addr = 0;
	kvm_s390_set_prefix(vcpu, 0);
	kvm_s390_set_cpu_timer(vcpu, 0);
	vcpu->arch.sie_block->ckc = 0;
	memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr));
	vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK;
	vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK;

	/* ... the data in sync regs */
	memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs));
	vcpu->run->s.regs.ckc = 0;
	vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK;
	vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK;
	vcpu->run->psw_addr = 0;
	vcpu->run->psw_mask = 0;
	vcpu->run->s.regs.todpr = 0;
	vcpu->run->s.regs.cputm = 0;
	vcpu->run->s.regs.ckc = 0;
	vcpu->run->s.regs.pp = 0;
	vcpu->run->s.regs.gbea = 1;
	vcpu->run->s.regs.fpc = 0;
	/*
	 * Do not reset these registers in the protected case, as some of
	 * them are overlayed and they are not accessible in this case
	 * anyway.
	 */
	if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
		vcpu->arch.sie_block->gbea = 1;
		vcpu->arch.sie_block->pp = 0;
		vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
		vcpu->arch.sie_block->todpr = 0;
	}
}

static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
{
	struct kvm_sync_regs *regs = &vcpu->run->s.regs;

	/* Clear reset is a superset of the initial reset */
	kvm_arch_vcpu_ioctl_initial_reset(vcpu);

	memset(&regs->gprs, 0, sizeof(regs->gprs));
	memset(&regs->vrs, 0, sizeof(regs->vrs));
	memset(&regs->acrs, 0, sizeof(regs->acrs));
	memset(&regs->gscb, 0, sizeof(regs->gscb));

	regs->etoken = 0;
	regs->etoken_extension = 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	vcpu_load(vcpu);
	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
	vcpu_put(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	vcpu_load(vcpu);
	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
	vcpu_put(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	vcpu_load(vcpu);

	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));

	vcpu_put(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	vcpu_load(vcpu);

	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
	memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));

	vcpu_put(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	int ret = 0;

	vcpu_load(vcpu);

	if (test_fp_ctl(fpu->fpc)) {
		ret = -EINVAL;
		goto out;
	}
	vcpu->run->s.regs.fpc = fpu->fpc;
	if (MACHINE_HAS_VX)
		convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
				 (freg_t *) fpu->fprs);
	else
		memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));

out:
	vcpu_put(vcpu);
	return ret;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	vcpu_load(vcpu);

	/* make sure we have the latest values */
	save_fpu_regs();
	if (MACHINE_HAS_VX)
		convert_vx_to_fp((freg_t *) fpu->fprs,
				 (__vector128 *) vcpu->run->s.regs.vrs);
	else
		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
	fpu->fpc = vcpu->run->s.regs.fpc;

	vcpu_put(vcpu);
	return 0;
}

static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
{
	int rc = 0;

	if (!is_vcpu_stopped(vcpu))
		rc = -EBUSY;
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
	return rc;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL; /* not implemented yet */
}

#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
			      KVM_GUESTDBG_USE_HW_BP | \
			      KVM_GUESTDBG_ENABLE)

int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
{
	int rc = 0;

	vcpu_load(vcpu);

	vcpu->guest_debug = 0;
	kvm_s390_clear_bp_data(vcpu);

	if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
		rc = -EINVAL;
		goto out;
	}
	if (!sclp.has_gpere) {
		rc = -EINVAL;
		goto out;
	}

	if (dbg->control & KVM_GUESTDBG_ENABLE) {
		vcpu->guest_debug = dbg->control;
		/* enforce guest PER */
		kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);

		if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
			rc = kvm_s390_import_bp_data(vcpu, dbg);
	} else {
		kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
		vcpu->arch.guestdbg.last_bp = 0;
	}

	if (rc) {
		vcpu->guest_debug = 0;
		kvm_s390_clear_bp_data(vcpu);
		kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
	}

out:
	vcpu_put(vcpu);
	return rc;
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	int ret;

	vcpu_load(vcpu);

	/* CHECK_STOP and LOAD are not supported yet */
	ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
				      KVM_MP_STATE_OPERATING;

	vcpu_put(vcpu);
	return ret;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	int rc = 0;

	vcpu_load(vcpu);

	/* user space knows about this interface - let it control the state */
	kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm);

	switch (mp_state->mp_state) {
	case KVM_MP_STATE_STOPPED:
		rc = kvm_s390_vcpu_stop(vcpu);
		break;
	case KVM_MP_STATE_OPERATING:
		rc = kvm_s390_vcpu_start(vcpu);
		break;
	case KVM_MP_STATE_LOAD:
		if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
			rc = -ENXIO;
			break;
		}
		rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
		break;
	case KVM_MP_STATE_CHECK_STOP:
		fallthrough;	/* CHECK_STOP and LOAD are not supported yet */
	default:
		rc = -ENXIO;
	}

	vcpu_put(vcpu);
	return rc;
}

static bool ibs_enabled(struct kvm_vcpu *vcpu)
{
	return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
}

static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
retry:
	kvm_s390_vcpu_request_handled(vcpu);
	if (!kvm_request_pending(vcpu))
		return 0;
	/*
	 * If the guest prefix changed, re-arm the ipte notifier for the
	 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
	 * This ensures that the ipte instruction for this request has
	 * already finished. We might race against a second unmapper that
	 * wants to set the blocking bit. Lets just retry the request loop.
	 */
	if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) {
		int rc;
		rc = gmap_mprotect_notify(vcpu->arch.gmap,
					  kvm_s390_get_prefix(vcpu),
					  PAGE_SIZE * 2, PROT_WRITE);
		if (rc) {
			kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
			return rc;
		}
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
		vcpu->arch.sie_block->ihcpu = 0xffff;
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
		if (!ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
			kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
		}
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
		if (ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
			kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
		}
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
		/*
		 * Disable CMM virtualization; we will emulate the ESSA
		 * instruction manually, in order to provide additional
		 * functionalities needed for live migration.
		 */
		vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
		/*
		 * Re-enable CMM virtualization if CMMA is available and
		 * CMM has been used.
		 */
		if ((vcpu->kvm->arch.use_cmma) &&
		    (vcpu->kvm->mm->context.uses_cmm))
			vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
		goto retry;
	}

	/* nothing to do, just clear the request */
	kvm_clear_request(KVM_REQ_UNHALT, vcpu);
	/* we left the vsie handler, nothing to do, just clear the request */
	kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);

	return 0;
}

static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
{
	struct kvm_vcpu *vcpu;
	union tod_clock clk;
	unsigned long i;

	preempt_disable();

	store_tod_clock_ext(&clk);

	kvm->arch.epoch = gtod->tod - clk.tod;
	kvm->arch.epdx = 0;
	if (test_kvm_facility(kvm, 139)) {
		kvm->arch.epdx = gtod->epoch_idx - clk.ei;
		if (kvm->arch.epoch > gtod->tod)
			kvm->arch.epdx -= 1;
	}

	kvm_s390_vcpu_block_all(kvm);
	kvm_for_each_vcpu(i, vcpu, kvm) {
		vcpu->arch.sie_block->epoch = kvm->arch.epoch;
		vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
	}

	kvm_s390_vcpu_unblock_all(kvm);
	preempt_enable();
}

void kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
{
	mutex_lock(&kvm->lock);
	__kvm_s390_set_tod_clock(kvm, gtod);
	mutex_unlock(&kvm->lock);
}

int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
{
	if (!mutex_trylock(&kvm->lock))
		return 0;
	__kvm_s390_set_tod_clock(kvm, gtod);
	mutex_unlock(&kvm->lock);
	return 1;
}

/**
 * kvm_arch_fault_in_page - fault-in guest page if necessary
 * @vcpu: The corresponding virtual cpu
 * @gpa: Guest physical address
 * @writable: Whether the page should be writable or not
 *
 * Make sure that a guest page has been faulted-in on the host.
 *
 * Return: Zero on success, negative error code otherwise.
 */
long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
{
	return gmap_fault(vcpu->arch.gmap, gpa,
			  writable ? FAULT_FLAG_WRITE : 0);
}

static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
				      unsigned long token)
{
	struct kvm_s390_interrupt inti;
	struct kvm_s390_irq irq;

	if (start_token) {
		irq.u.ext.ext_params2 = token;
		irq.type = KVM_S390_INT_PFAULT_INIT;
		WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
	} else {
		inti.type = KVM_S390_INT_PFAULT_DONE;
		inti.parm64 = token;
		WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
	}
}

bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
				     struct kvm_async_pf *work)
{
	trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
	__kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);

	return true;
}

void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
				 struct kvm_async_pf *work)
{
	trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
	__kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
}

void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
			       struct kvm_async_pf *work)
{
	/* s390 will always inject the page directly */
}

bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
{
	/*
	 * s390 will always inject the page directly,
	 * but we still want check_async_completion to cleanup
	 */
	return true;
}

static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
{
	hva_t hva;
	struct kvm_arch_async_pf arch;

	if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
		return false;
	if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
	    vcpu->arch.pfault_compare)
		return false;
	if (psw_extint_disabled(vcpu))
		return false;
	if (kvm_s390_vcpu_has_irq(vcpu, 0))
		return false;
	if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
		return false;
	if (!vcpu->arch.gmap->pfault_enabled)
		return false;

	hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
	hva += current->thread.gmap_addr & ~PAGE_MASK;
	if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
		return false;

	return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
}

static int vcpu_pre_run(struct kvm_vcpu *vcpu)
{
	int rc, cpuflags;

	/*
	 * On s390 notifications for arriving pages will be delivered directly
	 * to the guest but the house keeping for completed pfaults is
	 * handled outside the worker.
	 */
	kvm_check_async_pf_completion(vcpu);

	vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
	vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];

	if (need_resched())
		schedule();

	if (!kvm_is_ucontrol(vcpu->kvm)) {
		rc = kvm_s390_deliver_pending_interrupts(vcpu);
		if (rc)
			return rc;
	}

	rc = kvm_s390_handle_requests(vcpu);
	if (rc)
		return rc;

	if (guestdbg_enabled(vcpu)) {
		kvm_s390_backup_guest_per_regs(vcpu);
		kvm_s390_patch_guest_per_regs(vcpu);
	}

	clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);

	vcpu->arch.sie_block->icptcode = 0;
	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
	trace_kvm_s390_sie_enter(vcpu, cpuflags);

	return 0;
}

static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_pgm_info pgm_info = {
		.code = PGM_ADDRESSING,
	};
	u8 opcode, ilen;
	int rc;

	VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
	trace_kvm_s390_sie_fault(vcpu);

	/*
	 * We want to inject an addressing exception, which is defined as a
	 * suppressing or terminating exception. However, since we came here
	 * by a DAT access exception, the PSW still points to the faulting
	 * instruction since DAT exceptions are nullifying. So we've got
	 * to look up the current opcode to get the length of the instruction
	 * to be able to forward the PSW.
	 */
	rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
	ilen = insn_length(opcode);
	if (rc < 0) {
		return rc;
	} else if (rc) {
		/* Instruction-Fetching Exceptions - we can't detect the ilen.
		 * Forward by arbitrary ilc, injection will take care of
		 * nullification if necessary.
		 */
		pgm_info = vcpu->arch.pgm;
		ilen = 4;
	}
	pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
	kvm_s390_forward_psw(vcpu, ilen);
	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
}

static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
{
	struct mcck_volatile_info *mcck_info;
	struct sie_page *sie_page;

	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);

	if (guestdbg_enabled(vcpu))
		kvm_s390_restore_guest_per_regs(vcpu);

	vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
	vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;

	if (exit_reason == -EINTR) {
		VCPU_EVENT(vcpu, 3, "%s", "machine check");
		sie_page = container_of(vcpu->arch.sie_block,
					struct sie_page, sie_block);
		mcck_info = &sie_page->mcck_info;
		kvm_s390_reinject_machine_check(vcpu, mcck_info);
		return 0;
	}

	if (vcpu->arch.sie_block->icptcode > 0) {
		int rc = kvm_handle_sie_intercept(vcpu);

		if (rc != -EOPNOTSUPP)
			return rc;
		vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
		vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
		vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
		vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
		return -EREMOTE;
	} else if (exit_reason != -EFAULT) {
		vcpu->stat.exit_null++;
		return 0;
	} else if (kvm_is_ucontrol(vcpu->kvm)) {
		vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
		vcpu->run->s390_ucontrol.trans_exc_code =
						current->thread.gmap_addr;
		vcpu->run->s390_ucontrol.pgm_code = 0x10;
		return -EREMOTE;
	} else if (current->thread.gmap_pfault) {
		trace_kvm_s390_major_guest_pfault(vcpu);
		current->thread.gmap_pfault = 0;
		if (kvm_arch_setup_async_pf(vcpu))
			return 0;
		vcpu->stat.pfault_sync++;
		return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
	}
	return vcpu_post_run_fault_in_sie(vcpu);
}

#define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK)
static int __vcpu_run(struct kvm_vcpu *vcpu)
{
	int rc, exit_reason;
	struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block;

	/*
	 * We try to hold kvm->srcu during most of vcpu_run (except when run-
	 * ning the guest), so that memslots (and other stuff) are protected
	 */
	kvm_vcpu_srcu_read_lock(vcpu);

	do {
		rc = vcpu_pre_run(vcpu);
		if (rc)
			break;

		kvm_vcpu_srcu_read_unlock(vcpu);
		/*
		 * As PF_VCPU will be used in fault handler, between
		 * guest_enter and guest_exit should be no uaccess.
		 */
		local_irq_disable();
		guest_enter_irqoff();
		__disable_cpu_timer_accounting(vcpu);
		local_irq_enable();
		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
			memcpy(sie_page->pv_grregs,
			       vcpu->run->s.regs.gprs,
			       sizeof(sie_page->pv_grregs));
		}
		if (test_cpu_flag(CIF_FPU))
			load_fpu_regs();
		exit_reason = sie64a(vcpu->arch.sie_block,
				     vcpu->run->s.regs.gprs);
		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
			memcpy(vcpu->run->s.regs.gprs,
			       sie_page->pv_grregs,
			       sizeof(sie_page->pv_grregs));
			/*
			 * We're not allowed to inject interrupts on intercepts
			 * that leave the guest state in an "in-between" state
			 * where the next SIE entry will do a continuation.
			 * Fence interrupts in our "internal" PSW.
			 */
			if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR ||
			    vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) {
				vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
			}
		}
		local_irq_disable();
		__enable_cpu_timer_accounting(vcpu);
		guest_exit_irqoff();
		local_irq_enable();
		kvm_vcpu_srcu_read_lock(vcpu);

		rc = vcpu_post_run(vcpu, exit_reason);
	} while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);

	kvm_vcpu_srcu_read_unlock(vcpu);
	return rc;
}

static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;
	struct runtime_instr_cb *riccb;
	struct gs_cb *gscb;

	riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
	gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
	vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
	vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
		vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
		vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
		vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
		vcpu->arch.pfault_token = kvm_run->s.regs.pft;
		vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
		vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
		vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
		vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
		VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc);
	}
	/*
	 * If userspace sets the riccb (e.g. after migration) to a valid state,
	 * we should enable RI here instead of doing the lazy enablement.
	 */
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
	    test_kvm_facility(vcpu->kvm, 64) &&
	    riccb->v &&
	    !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
		vcpu->arch.sie_block->ecb3 |= ECB3_RI;
	}
	/*
	 * If userspace sets the gscb (e.g. after migration) to non-zero,
	 * we should enable GS here instead of doing the lazy enablement.
	 */
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
	    test_kvm_facility(vcpu->kvm, 133) &&
	    gscb->gssm &&
	    !vcpu->arch.gs_enabled) {
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
		vcpu->arch.sie_block->ecb |= ECB_GS;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
		vcpu->arch.gs_enabled = 1;
	}
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
	    test_kvm_facility(vcpu->kvm, 82)) {
		vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
		vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
	}
	if (MACHINE_HAS_GS) {
		preempt_disable();
		__ctl_set_bit(2, 4);
		if (current->thread.gs_cb) {
			vcpu->arch.host_gscb = current->thread.gs_cb;
			save_gs_cb(vcpu->arch.host_gscb);
		}
		if (vcpu->arch.gs_enabled) {
			current->thread.gs_cb = (struct gs_cb *)
						&vcpu->run->s.regs.gscb;
			restore_gs_cb(current->thread.gs_cb);
		}
		preempt_enable();
	}
	/* SIE will load etoken directly from SDNX and therefore kvm_run */
}

static void sync_regs(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;

	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
		/* some control register changes require a tlb flush */
		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
		kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
		vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
	}
	save_access_regs(vcpu->arch.host_acrs);
	restore_access_regs(vcpu->run->s.regs.acrs);
	/* save host (userspace) fprs/vrs */
	save_fpu_regs();
	vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
	vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
	if (MACHINE_HAS_VX)
		current->thread.fpu.regs = vcpu->run->s.regs.vrs;
	else
		current->thread.fpu.regs = vcpu->run->s.regs.fprs;
	current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
	if (test_fp_ctl(current->thread.fpu.fpc))
		/* User space provided an invalid FPC, let's clear it */
		current->thread.fpu.fpc = 0;

	/* Sync fmt2 only data */
	if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) {
		sync_regs_fmt2(vcpu);
	} else {
		/*
		 * In several places we have to modify our internal view to
		 * not do things that are disallowed by the ultravisor. For
		 * example we must not inject interrupts after specific exits
		 * (e.g. 112 prefix page not secure). We do this by turning
		 * off the machine check, external and I/O interrupt bits
		 * of our PSW copy. To avoid getting validity intercepts, we
		 * do only accept the condition code from userspace.
		 */
		vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC;
		vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask &
						   PSW_MASK_CC;
	}

	kvm_run->kvm_dirty_regs = 0;
}

static void store_regs_fmt2(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;

	kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
	kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
	kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
	kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
	kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val;
	if (MACHINE_HAS_GS) {
		preempt_disable();
		__ctl_set_bit(2, 4);
		if (vcpu->arch.gs_enabled)
			save_gs_cb(current->thread.gs_cb);
		current->thread.gs_cb = vcpu->arch.host_gscb;
		restore_gs_cb(vcpu->arch.host_gscb);
		if (!vcpu->arch.host_gscb)
			__ctl_clear_bit(2, 4);
		vcpu->arch.host_gscb = NULL;
		preempt_enable();
	}
	/* SIE will save etoken directly into SDNX and therefore kvm_run */
}

static void store_regs(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;

	kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
	kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
	kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
	kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
	kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
	kvm_run->s.regs.pft = vcpu->arch.pfault_token;
	kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
	kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
	save_access_regs(vcpu->run->s.regs.acrs);
	restore_access_regs(vcpu->arch.host_acrs);
	/* Save guest register state */
	save_fpu_regs();
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
	/* Restore will be done lazily at return */
	current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
	current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
	if (likely(!kvm_s390_pv_cpu_is_protected(vcpu)))
		store_regs_fmt2(vcpu);
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
{
	struct kvm_run *kvm_run = vcpu->run;
	int rc;

	/*
	 * Running a VM while dumping always has the potential to
	 * produce inconsistent dump data. But for PV vcpus a SIE
	 * entry while dumping could also lead to a fatal validity
	 * intercept which we absolutely want to avoid.
	 */
	if (vcpu->kvm->arch.pv.dumping)
		return -EINVAL;

	if (kvm_run->immediate_exit)
		return -EINTR;

	if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
	    kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
		return -EINVAL;

	vcpu_load(vcpu);

	if (guestdbg_exit_pending(vcpu)) {
		kvm_s390_prepare_debug_exit(vcpu);
		rc = 0;
		goto out;
	}

	kvm_sigset_activate(vcpu);

	/*
	 * no need to check the return value of vcpu_start as it can only have
	 * an error for protvirt, but protvirt means user cpu state
	 */
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
		kvm_s390_vcpu_start(vcpu);
	} else if (is_vcpu_stopped(vcpu)) {
		pr_err_ratelimited("can't run stopped vcpu %d\n",
				   vcpu->vcpu_id);
		rc = -EINVAL;
		goto out;
	}

	sync_regs(vcpu);
	enable_cpu_timer_accounting(vcpu);

	might_fault();
	rc = __vcpu_run(vcpu);

	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
		rc = -EINTR;
	}

	if (guestdbg_exit_pending(vcpu) && !rc)  {
		kvm_s390_prepare_debug_exit(vcpu);
		rc = 0;
	}

	if (rc == -EREMOTE) {
		/* userspace support is needed, kvm_run has been prepared */
		rc = 0;
	}

	disable_cpu_timer_accounting(vcpu);
	store_regs(vcpu);

	kvm_sigset_deactivate(vcpu);

	vcpu->stat.exit_userspace++;
out:
	vcpu_put(vcpu);
	return rc;
}

/*
 * store status at address
 * we use have two special cases:
 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
 */
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
{
	unsigned char archmode = 1;
	freg_t fprs[NUM_FPRS];
	unsigned int px;
	u64 clkcomp, cputm;
	int rc;

	px = kvm_s390_get_prefix(vcpu);
	if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
		if (write_guest_abs(vcpu, 163, &archmode, 1))
			return -EFAULT;
		gpa = 0;
	} else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
		if (write_guest_real(vcpu, 163, &archmode, 1))
			return -EFAULT;
		gpa = px;
	} else
		gpa -= __LC_FPREGS_SAVE_AREA;

	/* manually convert vector registers if necessary */
	if (MACHINE_HAS_VX) {
		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
				     fprs, 128);
	} else {
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
				     vcpu->run->s.regs.fprs, 128);
	}
	rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
			      vcpu->run->s.regs.gprs, 128);
	rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
			      &vcpu->arch.sie_block->gpsw, 16);
	rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
			      &px, 4);
	rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
			      &vcpu->run->s.regs.fpc, 4);
	rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
			      &vcpu->arch.sie_block->todpr, 4);
	cputm = kvm_s390_get_cpu_timer(vcpu);
	rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
			      &cputm, 8);
	clkcomp = vcpu->arch.sie_block->ckc >> 8;
	rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
			      &clkcomp, 8);
	rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
			      &vcpu->run->s.regs.acrs, 64);
	rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
			      &vcpu->arch.sie_block->gcr, 128);
	return rc ? -EFAULT : 0;
}

int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
{
	/*
	 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
	 * switch in the run ioctl. Let's update our copies before we save
	 * it into the save area
	 */
	save_fpu_regs();
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
	save_access_regs(vcpu->run->s.regs.acrs);

	return kvm_s390_store_status_unloaded(vcpu, addr);
}

static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
	kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
}

static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
{
	unsigned long i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		__disable_ibs_on_vcpu(vcpu);
	}
}

static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
	if (!sclp.has_ibs)
		return;
	kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
	kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
}

int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
{
	int i, online_vcpus, r = 0, started_vcpus = 0;

	if (!is_vcpu_stopped(vcpu))
		return 0;

	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
	/* Only one cpu at a time may enter/leave the STOPPED state. */
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

	/* Let's tell the UV that we want to change into the operating state */
	if (kvm_s390_pv_cpu_is_protected(vcpu)) {
		r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
		if (r) {
			spin_unlock(&vcpu->kvm->arch.start_stop_lock);
			return r;
		}
	}

	for (i = 0; i < online_vcpus; i++) {
		if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i)))
			started_vcpus++;
	}

	if (started_vcpus == 0) {
		/* we're the only active VCPU -> speed it up */
		__enable_ibs_on_vcpu(vcpu);
	} else if (started_vcpus == 1) {
		/*
		 * As we are starting a second VCPU, we have to disable
		 * the IBS facility on all VCPUs to remove potentially
		 * outstanding ENABLE requests.
		 */
		__disable_ibs_on_all_vcpus(vcpu->kvm);
	}

	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
	/*
	 * The real PSW might have changed due to a RESTART interpreted by the
	 * ultravisor. We block all interrupts and let the next sie exit
	 * refresh our view.
	 */
	if (kvm_s390_pv_cpu_is_protected(vcpu))
		vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
	/*
	 * Another VCPU might have used IBS while we were offline.
	 * Let's play safe and flush the VCPU at startup.
	 */
	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
	return 0;
}

int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
{
	int i, online_vcpus, r = 0, started_vcpus = 0;
	struct kvm_vcpu *started_vcpu = NULL;

	if (is_vcpu_stopped(vcpu))
		return 0;

	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
	/* Only one cpu at a time may enter/leave the STOPPED state. */
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

	/* Let's tell the UV that we want to change into the stopped state */
	if (kvm_s390_pv_cpu_is_protected(vcpu)) {
		r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
		if (r) {
			spin_unlock(&vcpu->kvm->arch.start_stop_lock);
			return r;
		}
	}

	/*
	 * Set the VCPU to STOPPED and THEN clear the interrupt flag,
	 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders
	 * have been fully processed. This will ensure that the VCPU
	 * is kept BUSY if another VCPU is inquiring with SIGP SENSE.
	 */
	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
	kvm_s390_clear_stop_irq(vcpu);

	__disable_ibs_on_vcpu(vcpu);

	for (i = 0; i < online_vcpus; i++) {
		struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i);

		if (!is_vcpu_stopped(tmp)) {
			started_vcpus++;
			started_vcpu = tmp;
		}
	}

	if (started_vcpus == 1) {
		/*
		 * As we only have one VCPU left, we want to enable the
		 * IBS facility for that VCPU to speed it up.
		 */
		__enable_ibs_on_vcpu(started_vcpu);
	}

	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
	return 0;
}

static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
				     struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
	case KVM_CAP_S390_CSS_SUPPORT:
		if (!vcpu->kvm->arch.css_support) {
			vcpu->kvm->arch.css_support = 1;
			VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
			trace_kvm_s390_enable_css(vcpu->kvm);
		}
		r = 0;
		break;
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu,
				  struct kvm_s390_mem_op *mop)
{
	void __user *uaddr = (void __user *)mop->buf;
	int r = 0;

	if (mop->flags || !mop->size)
		return -EINVAL;
	if (mop->size + mop->sida_offset < mop->size)
		return -EINVAL;
	if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
		return -E2BIG;
	if (!kvm_s390_pv_cpu_is_protected(vcpu))
		return -EINVAL;

	switch (mop->op) {
	case KVM_S390_MEMOP_SIDA_READ:
		if (copy_to_user(uaddr, (void *)(sida_origin(vcpu->arch.sie_block) +
				 mop->sida_offset), mop->size))
			r = -EFAULT;

		break;
	case KVM_S390_MEMOP_SIDA_WRITE:
		if (copy_from_user((void *)(sida_origin(vcpu->arch.sie_block) +
				   mop->sida_offset), uaddr, mop->size))
			r = -EFAULT;
		break;
	}
	return r;
}

static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
				 struct kvm_s390_mem_op *mop)
{
	void __user *uaddr = (void __user *)mop->buf;
	void *tmpbuf = NULL;
	int r = 0;
	const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
				    | KVM_S390_MEMOP_F_CHECK_ONLY
				    | KVM_S390_MEMOP_F_SKEY_PROTECTION;

	if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size)
		return -EINVAL;
	if (mop->size > MEM_OP_MAX_SIZE)
		return -E2BIG;
	if (kvm_s390_pv_cpu_is_protected(vcpu))
		return -EINVAL;
	if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
		if (access_key_invalid(mop->key))
			return -EINVAL;
	} else {
		mop->key = 0;
	}
	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
		tmpbuf = vmalloc(mop->size);
		if (!tmpbuf)
			return -ENOMEM;
	}

	switch (mop->op) {
	case KVM_S390_MEMOP_LOGICAL_READ:
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
			r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
					    GACC_FETCH, mop->key);
			break;
		}
		r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
					mop->size, mop->key);
		if (r == 0) {
			if (copy_to_user(uaddr, tmpbuf, mop->size))
				r = -EFAULT;
		}
		break;
	case KVM_S390_MEMOP_LOGICAL_WRITE:
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
			r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
					    GACC_STORE, mop->key);
			break;
		}
		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
			r = -EFAULT;
			break;
		}
		r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
					 mop->size, mop->key);
		break;
	}

	if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
		kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);

	vfree(tmpbuf);
	return r;
}

static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu,
				     struct kvm_s390_mem_op *mop)
{
	int r, srcu_idx;

	srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

	switch (mop->op) {
	case KVM_S390_MEMOP_LOGICAL_READ:
	case KVM_S390_MEMOP_LOGICAL_WRITE:
		r = kvm_s390_vcpu_mem_op(vcpu, mop);
		break;
	case KVM_S390_MEMOP_SIDA_READ:
	case KVM_S390_MEMOP_SIDA_WRITE:
		/* we are locked against sida going away by the vcpu->mutex */
		r = kvm_s390_vcpu_sida_op(vcpu, mop);
		break;
	default:
		r = -EINVAL;
	}

	srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
	return r;
}

long kvm_arch_vcpu_async_ioctl(struct file *filp,
			       unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;

	switch (ioctl) {
	case KVM_S390_IRQ: {
		struct kvm_s390_irq s390irq;

		if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
			return -EFAULT;
		return kvm_s390_inject_vcpu(vcpu, &s390irq);
	}
	case KVM_S390_INTERRUPT: {
		struct kvm_s390_interrupt s390int;
		struct kvm_s390_irq s390irq = {};

		if (copy_from_user(&s390int, argp, sizeof(s390int)))
			return -EFAULT;
		if (s390int_to_s390irq(&s390int, &s390irq))
			return -EINVAL;
		return kvm_s390_inject_vcpu(vcpu, &s390irq);
	}
	}
	return -ENOIOCTLCMD;
}

static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,
					struct kvm_pv_cmd *cmd)
{
	struct kvm_s390_pv_dmp dmp;
	void *data;
	int ret;

	/* Dump initialization is a prerequisite */
	if (!vcpu->kvm->arch.pv.dumping)
		return -EINVAL;

	if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp)))
		return -EFAULT;

	/* We only handle this subcmd right now */
	if (dmp.subcmd != KVM_PV_DUMP_CPU)
		return -EINVAL;

	/* CPU dump length is the same as create cpu storage donation. */
	if (dmp.buff_len != uv_info.guest_cpu_stor_len)
		return -EINVAL;

	data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc);

	VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x",
		   vcpu->vcpu_id, cmd->rc, cmd->rrc);

	if (ret)
		ret = -EINVAL;

	/* On success copy over the dump data */
	if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len))
		ret = -EFAULT;

	kvfree(data);
	return ret;
}

long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;
	int idx;
	long r;
	u16 rc, rrc;

	vcpu_load(vcpu);

	switch (ioctl) {
	case KVM_S390_STORE_STATUS:
		idx = srcu_read_lock(&vcpu->kvm->srcu);
		r = kvm_s390_store_status_unloaded(vcpu, arg);
		srcu_read_unlock(&vcpu->kvm->srcu, idx);
		break;
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

		r = -EFAULT;
		if (copy_from_user(&psw, argp, sizeof(psw)))
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
	}
	case KVM_S390_CLEAR_RESET:
		r = 0;
		kvm_arch_vcpu_ioctl_clear_reset(vcpu);
		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
			r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
					  UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc);
			VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x",
				   rc, rrc);
		}
		break;
	case KVM_S390_INITIAL_RESET:
		r = 0;
		kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
			r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
					  UVC_CMD_CPU_RESET_INITIAL,
					  &rc, &rrc);
			VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x",
				   rc, rrc);
		}
		break;
	case KVM_S390_NORMAL_RESET:
		r = 0;
		kvm_arch_vcpu_ioctl_normal_reset(vcpu);
		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
			r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
					  UVC_CMD_CPU_RESET, &rc, &rrc);
			VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x",
				   rc, rrc);
		}
		break;
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;
		r = -EINVAL;
		if (kvm_s390_pv_cpu_is_protected(vcpu))
			break;
		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;
		if (ioctl == KVM_SET_ONE_REG)
			r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
		else
			r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
		break;
	}
#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_S390_UCAS_MAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
				     ucasmap.vcpu_addr, ucasmap.length);
		break;
	}
	case KVM_S390_UCAS_UNMAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
			ucasmap.length);
		break;
	}
#endif
	case KVM_S390_VCPU_FAULT: {
		r = gmap_fault(vcpu->arch.gmap, arg, 0);
		break;
	}
	case KVM_ENABLE_CAP:
	{
		struct kvm_enable_cap cap;
		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
		break;
	}
	case KVM_S390_MEM_OP: {
		struct kvm_s390_mem_op mem_op;

		if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
			r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op);
		else
			r = -EFAULT;
		break;
	}
	case KVM_S390_SET_IRQ_STATE: {
		struct kvm_s390_irq_state irq_state;

		r = -EFAULT;
		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
			break;
		if (irq_state.len > VCPU_IRQS_MAX_BUF ||
		    irq_state.len == 0 ||
		    irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
			r = -EINVAL;
			break;
		}
		/* do not use irq_state.flags, it will break old QEMUs */
		r = kvm_s390_set_irq_state(vcpu,
					   (void __user *) irq_state.buf,
					   irq_state.len);
		break;
	}
	case KVM_S390_GET_IRQ_STATE: {
		struct kvm_s390_irq_state irq_state;

		r = -EFAULT;
		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
			break;
		if (irq_state.len == 0) {
			r = -EINVAL;
			break;
		}
		/* do not use irq_state.flags, it will break old QEMUs */
		r = kvm_s390_get_irq_state(vcpu,
					   (__u8 __user *)  irq_state.buf,
					   irq_state.len);
		break;
	}
	case KVM_S390_PV_CPU_COMMAND: {
		struct kvm_pv_cmd cmd;

		r = -EINVAL;
		if (!is_prot_virt_host())
			break;

		r = -EFAULT;
		if (copy_from_user(&cmd, argp, sizeof(cmd)))
			break;

		r = -EINVAL;
		if (cmd.flags)
			break;

		/* We only handle this cmd right now */
		if (cmd.cmd != KVM_PV_DUMP)
			break;

		r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd);

		/* Always copy over UV rc / rrc data */
		if (copy_to_user((__u8 __user *)argp, &cmd.rc,
				 sizeof(cmd.rc) + sizeof(cmd.rrc)))
			r = -EFAULT;
		break;
	}
	default:
		r = -ENOTTY;
	}

	vcpu_put(vcpu);
	return r;
}

vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
#ifdef CONFIG_KVM_S390_UCONTROL
	if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
		 && (kvm_is_ucontrol(vcpu->kvm))) {
		vmf->page = virt_to_page(vcpu->arch.sie_block);
		get_page(vmf->page);
		return 0;
	}
#endif
	return VM_FAULT_SIGBUS;
}

/* Section: memory related */
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   const struct kvm_memory_slot *old,
				   struct kvm_memory_slot *new,
				   enum kvm_mr_change change)
{
	gpa_t size;

	/* When we are protected, we should not change the memory slots */
	if (kvm_s390_pv_get_handle(kvm))
		return -EINVAL;

	if (change == KVM_MR_DELETE || change == KVM_MR_FLAGS_ONLY)
		return 0;

	/* A few sanity checks. We can have memory slots which have to be
	   located/ended at a segment boundary (1MB). The memory in userland is
	   ok to be fragmented into various different vmas. It is okay to mmap()
	   and munmap() stuff in this slot after doing this call at any time */

	if (new->userspace_addr & 0xffffful)
		return -EINVAL;

	size = new->npages * PAGE_SIZE;
	if (size & 0xffffful)
		return -EINVAL;

	if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit)
		return -EINVAL;

	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
				struct kvm_memory_slot *old,
				const struct kvm_memory_slot *new,
				enum kvm_mr_change change)
{
	int rc = 0;

	switch (change) {
	case KVM_MR_DELETE:
		rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
					old->npages * PAGE_SIZE);
		break;
	case KVM_MR_MOVE:
		rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
					old->npages * PAGE_SIZE);
		if (rc)
			break;
		fallthrough;
	case KVM_MR_CREATE:
		rc = gmap_map_segment(kvm->arch.gmap, new->userspace_addr,
				      new->base_gfn * PAGE_SIZE,
				      new->npages * PAGE_SIZE);
		break;
	case KVM_MR_FLAGS_ONLY:
		break;
	default:
		WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
	}
	if (rc)
		pr_warn("failed to commit memory region\n");
	return;
}

static inline unsigned long nonhyp_mask(int i)
{
	unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;

	return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
}

static int __init kvm_s390_init(void)
{
	int i;

	if (!sclp.has_sief2) {
		pr_info("SIE is not available\n");
		return -ENODEV;
	}

	if (nested && hpage) {
		pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
		return -EINVAL;
	}

	for (i = 0; i < 16; i++)
		kvm_s390_fac_base[i] |=
			stfle_fac_list[i] & nonhyp_mask(i);

	return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
}

static void __exit kvm_s390_exit(void)
{
	kvm_exit();
}

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);

/*
 * Enable autoloading of the kvm module.
 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
 * since x86 takes a different approach.
 */
#include <linux/miscdevice.h>
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");