109cf57ebSDavid Brazdil // SPDX-License-Identifier: GPL-2.0-only 209cf57ebSDavid Brazdil /* 309cf57ebSDavid Brazdil * Copyright (C) 2015 - ARM Ltd 409cf57ebSDavid Brazdil * Author: Marc Zyngier <marc.zyngier@arm.com> 509cf57ebSDavid Brazdil */ 609cf57ebSDavid Brazdil 709cf57ebSDavid Brazdil #include <hyp/switch.h> 809cf57ebSDavid Brazdil 909cf57ebSDavid Brazdil #include <linux/arm-smccc.h> 1009cf57ebSDavid Brazdil #include <linux/kvm_host.h> 1109cf57ebSDavid Brazdil #include <linux/types.h> 1209cf57ebSDavid Brazdil #include <linux/jump_label.h> 1309cf57ebSDavid Brazdil #include <uapi/linux/psci.h> 1409cf57ebSDavid Brazdil 1509cf57ebSDavid Brazdil #include <kvm/arm_psci.h> 1609cf57ebSDavid Brazdil 1709cf57ebSDavid Brazdil #include <asm/barrier.h> 1809cf57ebSDavid Brazdil #include <asm/cpufeature.h> 1909cf57ebSDavid Brazdil #include <asm/kprobes.h> 2009cf57ebSDavid Brazdil #include <asm/kvm_asm.h> 2109cf57ebSDavid Brazdil #include <asm/kvm_emulate.h> 2209cf57ebSDavid Brazdil #include <asm/kvm_hyp.h> 2309cf57ebSDavid Brazdil #include <asm/kvm_mmu.h> 2409cf57ebSDavid Brazdil #include <asm/fpsimd.h> 2509cf57ebSDavid Brazdil #include <asm/debug-monitors.h> 2609cf57ebSDavid Brazdil #include <asm/processor.h> 2709cf57ebSDavid Brazdil #include <asm/thread_info.h> 2809cf57ebSDavid Brazdil 2909cf57ebSDavid Brazdil const char __hyp_panic_string[] = "HYP panic:\nPS:%08llx PC:%016llx ESR:%08llx\nFAR:%016llx HPFAR:%016llx PAR:%016llx\nVCPU:%p\n"; 3009cf57ebSDavid Brazdil 3114ef9d04SMarc Zyngier /* VHE specific context */ 3214ef9d04SMarc Zyngier DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data); 3314ef9d04SMarc Zyngier DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt); 3414ef9d04SMarc Zyngier DEFINE_PER_CPU(unsigned long, kvm_hyp_vector); 352a1198c9SDavid Brazdil 3609cf57ebSDavid Brazdil static void __activate_traps(struct kvm_vcpu *vcpu) 3709cf57ebSDavid Brazdil { 3809cf57ebSDavid Brazdil u64 val; 3909cf57ebSDavid Brazdil 4009cf57ebSDavid Brazdil ___activate_traps(vcpu); 4109cf57ebSDavid Brazdil 4209cf57ebSDavid Brazdil val = read_sysreg(cpacr_el1); 4309cf57ebSDavid Brazdil val |= CPACR_EL1_TTA; 4409cf57ebSDavid Brazdil val &= ~CPACR_EL1_ZEN; 4509cf57ebSDavid Brazdil 4609cf57ebSDavid Brazdil /* 4709cf57ebSDavid Brazdil * With VHE (HCR.E2H == 1), accesses to CPACR_EL1 are routed to 4809cf57ebSDavid Brazdil * CPTR_EL2. In general, CPACR_EL1 has the same layout as CPTR_EL2, 4909cf57ebSDavid Brazdil * except for some missing controls, such as TAM. 5009cf57ebSDavid Brazdil * In this case, CPTR_EL2.TAM has the same position with or without 5109cf57ebSDavid Brazdil * VHE (HCR.E2H == 1) which allows us to use here the CPTR_EL2.TAM 5209cf57ebSDavid Brazdil * shift value for trapping the AMU accesses. 5309cf57ebSDavid Brazdil */ 5409cf57ebSDavid Brazdil 5509cf57ebSDavid Brazdil val |= CPTR_EL2_TAM; 5609cf57ebSDavid Brazdil 5709cf57ebSDavid Brazdil if (update_fp_enabled(vcpu)) { 5809cf57ebSDavid Brazdil if (vcpu_has_sve(vcpu)) 5909cf57ebSDavid Brazdil val |= CPACR_EL1_ZEN; 6009cf57ebSDavid Brazdil } else { 6109cf57ebSDavid Brazdil val &= ~CPACR_EL1_FPEN; 6209cf57ebSDavid Brazdil __activate_traps_fpsimd32(vcpu); 6309cf57ebSDavid Brazdil } 6409cf57ebSDavid Brazdil 6509cf57ebSDavid Brazdil write_sysreg(val, cpacr_el1); 6609cf57ebSDavid Brazdil 67a0e47952SAndrew Scull write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el1); 6809cf57ebSDavid Brazdil } 6909cf57ebSDavid Brazdil NOKPROBE_SYMBOL(__activate_traps); 7009cf57ebSDavid Brazdil 7109cf57ebSDavid Brazdil static void __deactivate_traps(struct kvm_vcpu *vcpu) 7209cf57ebSDavid Brazdil { 7309cf57ebSDavid Brazdil extern char vectors[]; /* kernel exception vectors */ 7409cf57ebSDavid Brazdil 7509cf57ebSDavid Brazdil ___deactivate_traps(vcpu); 7609cf57ebSDavid Brazdil 7709cf57ebSDavid Brazdil write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2); 7809cf57ebSDavid Brazdil 7909cf57ebSDavid Brazdil /* 8009cf57ebSDavid Brazdil * ARM errata 1165522 and 1530923 require the actual execution of the 8109cf57ebSDavid Brazdil * above before we can switch to the EL2/EL0 translation regime used by 8209cf57ebSDavid Brazdil * the host. 8309cf57ebSDavid Brazdil */ 8409cf57ebSDavid Brazdil asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT)); 8509cf57ebSDavid Brazdil 8609cf57ebSDavid Brazdil write_sysreg(CPACR_EL1_DEFAULT, cpacr_el1); 8709cf57ebSDavid Brazdil write_sysreg(vectors, vbar_el1); 8809cf57ebSDavid Brazdil } 8909cf57ebSDavid Brazdil NOKPROBE_SYMBOL(__deactivate_traps); 9009cf57ebSDavid Brazdil 9109cf57ebSDavid Brazdil void activate_traps_vhe_load(struct kvm_vcpu *vcpu) 9209cf57ebSDavid Brazdil { 9309cf57ebSDavid Brazdil __activate_traps_common(vcpu); 9409cf57ebSDavid Brazdil } 9509cf57ebSDavid Brazdil 9609cf57ebSDavid Brazdil void deactivate_traps_vhe_put(void) 9709cf57ebSDavid Brazdil { 9809cf57ebSDavid Brazdil u64 mdcr_el2 = read_sysreg(mdcr_el2); 9909cf57ebSDavid Brazdil 10009cf57ebSDavid Brazdil mdcr_el2 &= MDCR_EL2_HPMN_MASK | 10109cf57ebSDavid Brazdil MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT | 10209cf57ebSDavid Brazdil MDCR_EL2_TPMS; 10309cf57ebSDavid Brazdil 10409cf57ebSDavid Brazdil write_sysreg(mdcr_el2, mdcr_el2); 10509cf57ebSDavid Brazdil 10609cf57ebSDavid Brazdil __deactivate_traps_common(); 10709cf57ebSDavid Brazdil } 10809cf57ebSDavid Brazdil 10909cf57ebSDavid Brazdil /* Switch to the guest for VHE systems running in EL2 */ 11009cf57ebSDavid Brazdil static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu) 11109cf57ebSDavid Brazdil { 11209cf57ebSDavid Brazdil struct kvm_cpu_context *host_ctxt; 11309cf57ebSDavid Brazdil struct kvm_cpu_context *guest_ctxt; 11409cf57ebSDavid Brazdil u64 exit_code; 11509cf57ebSDavid Brazdil 116717cf94aSDavid Brazdil host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; 11709cf57ebSDavid Brazdil host_ctxt->__hyp_running_vcpu = vcpu; 11809cf57ebSDavid Brazdil guest_ctxt = &vcpu->arch.ctxt; 11909cf57ebSDavid Brazdil 12009cf57ebSDavid Brazdil sysreg_save_host_state_vhe(host_ctxt); 12109cf57ebSDavid Brazdil 12209cf57ebSDavid Brazdil /* 12309cf57ebSDavid Brazdil * ARM erratum 1165522 requires us to configure both stage 1 and 12409cf57ebSDavid Brazdil * stage 2 translation for the guest context before we clear 12509cf57ebSDavid Brazdil * HCR_EL2.TGE. 12609cf57ebSDavid Brazdil * 12709cf57ebSDavid Brazdil * We have already configured the guest's stage 1 translation in 128501a67a2SAndrew Scull * kvm_vcpu_load_sysregs_vhe above. We must now call 129501a67a2SAndrew Scull * __load_guest_stage2 before __activate_traps, because 130501a67a2SAndrew Scull * __load_guest_stage2 configures stage 2 translation, and 131501a67a2SAndrew Scull * __activate_traps clear HCR_EL2.TGE (among other things). 13209cf57ebSDavid Brazdil */ 133501a67a2SAndrew Scull __load_guest_stage2(vcpu->arch.hw_mmu); 13409cf57ebSDavid Brazdil __activate_traps(vcpu); 13509cf57ebSDavid Brazdil 13609cf57ebSDavid Brazdil sysreg_restore_guest_state_vhe(guest_ctxt); 13709cf57ebSDavid Brazdil __debug_switch_to_guest(vcpu); 13809cf57ebSDavid Brazdil 13909cf57ebSDavid Brazdil do { 14009cf57ebSDavid Brazdil /* Jump in the fire! */ 141b619d9aaSAndrew Scull exit_code = __guest_enter(vcpu); 14209cf57ebSDavid Brazdil 14309cf57ebSDavid Brazdil /* And we're baaack! */ 14409cf57ebSDavid Brazdil } while (fixup_guest_exit(vcpu, &exit_code)); 14509cf57ebSDavid Brazdil 14609cf57ebSDavid Brazdil sysreg_save_guest_state_vhe(guest_ctxt); 14709cf57ebSDavid Brazdil 14809cf57ebSDavid Brazdil __deactivate_traps(vcpu); 14909cf57ebSDavid Brazdil 15009cf57ebSDavid Brazdil sysreg_restore_host_state_vhe(host_ctxt); 15109cf57ebSDavid Brazdil 15209cf57ebSDavid Brazdil if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) 15309cf57ebSDavid Brazdil __fpsimd_save_fpexc32(vcpu); 15409cf57ebSDavid Brazdil 15509cf57ebSDavid Brazdil __debug_switch_to_host(vcpu); 15609cf57ebSDavid Brazdil 15709cf57ebSDavid Brazdil return exit_code; 15809cf57ebSDavid Brazdil } 15909cf57ebSDavid Brazdil NOKPROBE_SYMBOL(__kvm_vcpu_run_vhe); 16009cf57ebSDavid Brazdil 16109cf57ebSDavid Brazdil int __kvm_vcpu_run(struct kvm_vcpu *vcpu) 16209cf57ebSDavid Brazdil { 16309cf57ebSDavid Brazdil int ret; 16409cf57ebSDavid Brazdil 16509cf57ebSDavid Brazdil local_daif_mask(); 16609cf57ebSDavid Brazdil 16709cf57ebSDavid Brazdil /* 16809cf57ebSDavid Brazdil * Having IRQs masked via PMR when entering the guest means the GIC 16909cf57ebSDavid Brazdil * will not signal the CPU of interrupts of lower priority, and the 17009cf57ebSDavid Brazdil * only way to get out will be via guest exceptions. 17109cf57ebSDavid Brazdil * Naturally, we want to avoid this. 17209cf57ebSDavid Brazdil * 17309cf57ebSDavid Brazdil * local_daif_mask() already sets GIC_PRIO_PSR_I_SET, we just need a 17409cf57ebSDavid Brazdil * dsb to ensure the redistributor is forwards EL2 IRQs to the CPU. 17509cf57ebSDavid Brazdil */ 17609cf57ebSDavid Brazdil pmr_sync(); 17709cf57ebSDavid Brazdil 17809cf57ebSDavid Brazdil ret = __kvm_vcpu_run_vhe(vcpu); 17909cf57ebSDavid Brazdil 18009cf57ebSDavid Brazdil /* 18109cf57ebSDavid Brazdil * local_daif_restore() takes care to properly restore PSTATE.DAIF 18209cf57ebSDavid Brazdil * and the GIC PMR if the host is using IRQ priorities. 18309cf57ebSDavid Brazdil */ 18409cf57ebSDavid Brazdil local_daif_restore(DAIF_PROCCTX_NOIRQ); 18509cf57ebSDavid Brazdil 18609cf57ebSDavid Brazdil /* 18709cf57ebSDavid Brazdil * When we exit from the guest we change a number of CPU configuration 18809cf57ebSDavid Brazdil * parameters, such as traps. Make sure these changes take effect 18909cf57ebSDavid Brazdil * before running the host or additional guests. 19009cf57ebSDavid Brazdil */ 19109cf57ebSDavid Brazdil isb(); 19209cf57ebSDavid Brazdil 19309cf57ebSDavid Brazdil return ret; 19409cf57ebSDavid Brazdil } 19509cf57ebSDavid Brazdil 1966a0259edSAndrew Scull static void __hyp_call_panic(u64 spsr, u64 elr, u64 par) 19709cf57ebSDavid Brazdil { 1986a0259edSAndrew Scull struct kvm_cpu_context *host_ctxt; 19909cf57ebSDavid Brazdil struct kvm_vcpu *vcpu; 2006a0259edSAndrew Scull 20114ef9d04SMarc Zyngier host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; 20209cf57ebSDavid Brazdil vcpu = host_ctxt->__hyp_running_vcpu; 20309cf57ebSDavid Brazdil 20409cf57ebSDavid Brazdil __deactivate_traps(vcpu); 20509cf57ebSDavid Brazdil sysreg_restore_host_state_vhe(host_ctxt); 20609cf57ebSDavid Brazdil 20709cf57ebSDavid Brazdil panic(__hyp_panic_string, 20809cf57ebSDavid Brazdil spsr, elr, 20909cf57ebSDavid Brazdil read_sysreg_el2(SYS_ESR), read_sysreg_el2(SYS_FAR), 21009cf57ebSDavid Brazdil read_sysreg(hpfar_el2), par, vcpu); 21109cf57ebSDavid Brazdil } 21209cf57ebSDavid Brazdil NOKPROBE_SYMBOL(__hyp_call_panic); 21309cf57ebSDavid Brazdil 2146a0259edSAndrew Scull void __noreturn hyp_panic(void) 21509cf57ebSDavid Brazdil { 21609cf57ebSDavid Brazdil u64 spsr = read_sysreg_el2(SYS_SPSR); 21709cf57ebSDavid Brazdil u64 elr = read_sysreg_el2(SYS_ELR); 21896d389caSRob Herring u64 par = read_sysreg_par(); 21909cf57ebSDavid Brazdil 2206a0259edSAndrew Scull __hyp_call_panic(spsr, elr, par); 22109cf57ebSDavid Brazdil unreachable(); 22209cf57ebSDavid Brazdil } 223e9ee186bSJames Morse 224e9ee186bSJames Morse asmlinkage void kvm_unexpected_el2_exception(void) 225e9ee186bSJames Morse { 226e9ee186bSJames Morse return __kvm_unexpected_el2_exception(); 227e9ee186bSJames Morse } 228