/* * QEMU Xen emulation: Event channel support * * Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * Authors: David Woodhouse * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. */ #include "qemu/osdep.h" #include "qemu/host-utils.h" #include "qemu/module.h" #include "qemu/lockable.h" #include "qemu/main-loop.h" #include "qemu/log.h" #include "monitor/monitor.h" #include "monitor/hmp.h" #include "qapi/error.h" #include "qapi/qapi-commands-misc-target.h" #include "qapi/qmp/qdict.h" #include "qom/object.h" #include "exec/target_page.h" #include "exec/address-spaces.h" #include "migration/vmstate.h" #include "hw/sysbus.h" #include "hw/xen/xen.h" #include "xen_evtchn.h" #include "xen_overlay.h" #include "sysemu/kvm.h" #include "sysemu/kvm_xen.h" #include #include "hw/xen/interface/memory.h" #include "hw/xen/interface/hvm/params.h" #define TYPE_XEN_EVTCHN "xen-evtchn" OBJECT_DECLARE_SIMPLE_TYPE(XenEvtchnState, XEN_EVTCHN) typedef struct XenEvtchnPort { uint32_t vcpu; /* Xen/ACPI vcpu_id */ uint16_t type; /* EVTCHNSTAT_xxxx */ uint16_t type_val; /* pirq# / virq# / remote port according to type */ } XenEvtchnPort; /* 32-bit compatibility definitions, also used natively in 32-bit build */ struct compat_arch_vcpu_info { unsigned int cr2; unsigned int pad[5]; }; struct compat_vcpu_info { uint8_t evtchn_upcall_pending; uint8_t evtchn_upcall_mask; uint16_t pad; uint32_t evtchn_pending_sel; struct compat_arch_vcpu_info arch; struct vcpu_time_info time; }; /* 64 bytes (x86) */ struct compat_arch_shared_info { unsigned int max_pfn; unsigned int pfn_to_mfn_frame_list_list; unsigned int nmi_reason; unsigned int p2m_cr3; unsigned int p2m_vaddr; unsigned int p2m_generation; uint32_t wc_sec_hi; }; struct compat_shared_info { struct compat_vcpu_info vcpu_info[XEN_LEGACY_MAX_VCPUS]; uint32_t evtchn_pending[32]; uint32_t evtchn_mask[32]; uint32_t wc_version; /* Version counter: see vcpu_time_info_t. */ uint32_t wc_sec; uint32_t wc_nsec; struct compat_arch_shared_info arch; }; #define COMPAT_EVTCHN_2L_NR_CHANNELS 1024 /* * For unbound/interdomain ports there are only two possible remote * domains; self and QEMU. Use a single high bit in type_val for that, * and the low bits for the remote port number (or 0 for unbound). */ #define PORT_INFO_TYPEVAL_REMOTE_QEMU 0x8000 #define PORT_INFO_TYPEVAL_REMOTE_PORT_MASK 0x7FFF struct XenEvtchnState { /*< private >*/ SysBusDevice busdev; /*< public >*/ uint64_t callback_param; bool evtchn_in_kernel; QemuMutex port_lock; uint32_t nr_ports; XenEvtchnPort port_table[EVTCHN_2L_NR_CHANNELS]; }; struct XenEvtchnState *xen_evtchn_singleton; /* Top bits of callback_param are the type (HVM_PARAM_CALLBACK_TYPE_xxx) */ #define CALLBACK_VIA_TYPE_SHIFT 56 static int xen_evtchn_post_load(void *opaque, int version_id) { XenEvtchnState *s = opaque; if (s->callback_param) { xen_evtchn_set_callback_param(s->callback_param); } return 0; } static bool xen_evtchn_is_needed(void *opaque) { return xen_mode == XEN_EMULATE; } static const VMStateDescription xen_evtchn_port_vmstate = { .name = "xen_evtchn_port", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField[]) { VMSTATE_UINT32(vcpu, XenEvtchnPort), VMSTATE_UINT16(type, XenEvtchnPort), VMSTATE_UINT16(type_val, XenEvtchnPort), VMSTATE_END_OF_LIST() } }; static const VMStateDescription xen_evtchn_vmstate = { .name = "xen_evtchn", .version_id = 1, .minimum_version_id = 1, .needed = xen_evtchn_is_needed, .post_load = xen_evtchn_post_load, .fields = (VMStateField[]) { VMSTATE_UINT64(callback_param, XenEvtchnState), VMSTATE_UINT32(nr_ports, XenEvtchnState), VMSTATE_STRUCT_VARRAY_UINT32(port_table, XenEvtchnState, nr_ports, 1, xen_evtchn_port_vmstate, XenEvtchnPort), VMSTATE_END_OF_LIST() } }; static void xen_evtchn_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); dc->vmsd = &xen_evtchn_vmstate; } static const TypeInfo xen_evtchn_info = { .name = TYPE_XEN_EVTCHN, .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(XenEvtchnState), .class_init = xen_evtchn_class_init, }; void xen_evtchn_create(void) { XenEvtchnState *s = XEN_EVTCHN(sysbus_create_simple(TYPE_XEN_EVTCHN, -1, NULL)); xen_evtchn_singleton = s; qemu_mutex_init(&s->port_lock); } static void xen_evtchn_register_types(void) { type_register_static(&xen_evtchn_info); } type_init(xen_evtchn_register_types) int xen_evtchn_set_callback_param(uint64_t param) { XenEvtchnState *s = xen_evtchn_singleton; struct kvm_xen_hvm_attr xa = { .type = KVM_XEN_ATTR_TYPE_UPCALL_VECTOR, .u.vector = 0, }; bool in_kernel = false; int ret; if (!s) { return -ENOTSUP; } qemu_mutex_lock(&s->port_lock); switch (param >> CALLBACK_VIA_TYPE_SHIFT) { case HVM_PARAM_CALLBACK_TYPE_VECTOR: { xa.u.vector = (uint8_t)param, ret = kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &xa); if (!ret && kvm_xen_has_cap(EVTCHN_SEND)) { in_kernel = true; } break; } default: /* Xen doesn't return error even if you set something bogus */ ret = 0; break; } if (!ret) { /* If vector delivery was turned *off* then tell the kernel */ if ((s->callback_param >> CALLBACK_VIA_TYPE_SHIFT) == HVM_PARAM_CALLBACK_TYPE_VECTOR && !xa.u.vector) { kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &xa); } s->callback_param = param; s->evtchn_in_kernel = in_kernel; } qemu_mutex_unlock(&s->port_lock); return ret; } static void inject_callback(XenEvtchnState *s, uint32_t vcpu) { int type = s->callback_param >> CALLBACK_VIA_TYPE_SHIFT; kvm_xen_inject_vcpu_callback_vector(vcpu, type); } static void deassign_kernel_port(evtchn_port_t port) { struct kvm_xen_hvm_attr ha; int ret; ha.type = KVM_XEN_ATTR_TYPE_EVTCHN; ha.u.evtchn.send_port = port; ha.u.evtchn.flags = KVM_XEN_EVTCHN_DEASSIGN; ret = kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &ha); if (ret) { qemu_log_mask(LOG_GUEST_ERROR, "Failed to unbind kernel port %d: %s\n", port, strerror(ret)); } } static int assign_kernel_port(uint16_t type, evtchn_port_t port, uint32_t vcpu_id) { CPUState *cpu = qemu_get_cpu(vcpu_id); struct kvm_xen_hvm_attr ha; if (!cpu) { return -ENOENT; } ha.type = KVM_XEN_ATTR_TYPE_EVTCHN; ha.u.evtchn.send_port = port; ha.u.evtchn.type = type; ha.u.evtchn.flags = 0; ha.u.evtchn.deliver.port.port = port; ha.u.evtchn.deliver.port.vcpu = kvm_arch_vcpu_id(cpu); ha.u.evtchn.deliver.port.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL; return kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &ha); } static bool valid_port(evtchn_port_t port) { if (!port) { return false; } if (xen_is_long_mode()) { return port < EVTCHN_2L_NR_CHANNELS; } else { return port < COMPAT_EVTCHN_2L_NR_CHANNELS; } } static bool valid_vcpu(uint32_t vcpu) { return !!qemu_get_cpu(vcpu); } int xen_evtchn_status_op(struct evtchn_status *status) { XenEvtchnState *s = xen_evtchn_singleton; XenEvtchnPort *p; if (!s) { return -ENOTSUP; } if (status->dom != DOMID_SELF && status->dom != xen_domid) { return -ESRCH; } if (!valid_port(status->port)) { return -EINVAL; } qemu_mutex_lock(&s->port_lock); p = &s->port_table[status->port]; status->status = p->type; status->vcpu = p->vcpu; switch (p->type) { case EVTCHNSTAT_unbound: if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) { status->u.unbound.dom = DOMID_QEMU; } else { status->u.unbound.dom = xen_domid; } break; case EVTCHNSTAT_interdomain: if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) { status->u.interdomain.dom = DOMID_QEMU; } else { status->u.interdomain.dom = xen_domid; } status->u.interdomain.port = p->type_val & PORT_INFO_TYPEVAL_REMOTE_PORT_MASK; break; case EVTCHNSTAT_pirq: status->u.pirq = p->type_val; break; case EVTCHNSTAT_virq: status->u.virq = p->type_val; break; } qemu_mutex_unlock(&s->port_lock); return 0; } /* * Never thought I'd hear myself say this, but C++ templates would be * kind of nice here. * * template static int do_unmask_port(T *shinfo, ...); */ static int do_unmask_port_lm(XenEvtchnState *s, evtchn_port_t port, bool do_unmask, struct shared_info *shinfo, struct vcpu_info *vcpu_info) { const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); typeof(shinfo->evtchn_pending[0]) mask; int idx = port / bits_per_word; int offset = port % bits_per_word; mask = 1UL << offset; if (idx >= bits_per_word) { return -EINVAL; } if (do_unmask) { /* * If this is a true unmask operation, clear the mask bit. If * it was already unmasked, we have nothing further to do. */ if (!((qatomic_fetch_and(&shinfo->evtchn_mask[idx], ~mask) & mask))) { return 0; } } else { /* * This is a pseudo-unmask for affinity changes. We don't * change the mask bit, and if it's *masked* we have nothing * else to do. */ if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) { return 0; } } /* If the event was not pending, we're done. */ if (!(qatomic_fetch_or(&shinfo->evtchn_pending[idx], 0) & mask)) { return 0; } /* Now on to the vcpu_info evtchn_pending_sel index... */ mask = 1UL << idx; /* If a port in this word was already pending for this vCPU, all done. */ if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) { return 0; } /* Set evtchn_upcall_pending for this vCPU */ if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) { return 0; } inject_callback(s, s->port_table[port].vcpu); return 0; } static int do_unmask_port_compat(XenEvtchnState *s, evtchn_port_t port, bool do_unmask, struct compat_shared_info *shinfo, struct compat_vcpu_info *vcpu_info) { const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); typeof(shinfo->evtchn_pending[0]) mask; int idx = port / bits_per_word; int offset = port % bits_per_word; mask = 1UL << offset; if (idx >= bits_per_word) { return -EINVAL; } if (do_unmask) { /* * If this is a true unmask operation, clear the mask bit. If * it was already unmasked, we have nothing further to do. */ if (!((qatomic_fetch_and(&shinfo->evtchn_mask[idx], ~mask) & mask))) { return 0; } } else { /* * This is a pseudo-unmask for affinity changes. We don't * change the mask bit, and if it's *masked* we have nothing * else to do. */ if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) { return 0; } } /* If the event was not pending, we're done. */ if (!(qatomic_fetch_or(&shinfo->evtchn_pending[idx], 0) & mask)) { return 0; } /* Now on to the vcpu_info evtchn_pending_sel index... */ mask = 1UL << idx; /* If a port in this word was already pending for this vCPU, all done. */ if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) { return 0; } /* Set evtchn_upcall_pending for this vCPU */ if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) { return 0; } inject_callback(s, s->port_table[port].vcpu); return 0; } static int unmask_port(XenEvtchnState *s, evtchn_port_t port, bool do_unmask) { void *vcpu_info, *shinfo; if (s->port_table[port].type == EVTCHNSTAT_closed) { return -EINVAL; } shinfo = xen_overlay_get_shinfo_ptr(); if (!shinfo) { return -ENOTSUP; } vcpu_info = kvm_xen_get_vcpu_info_hva(s->port_table[port].vcpu); if (!vcpu_info) { return -EINVAL; } if (xen_is_long_mode()) { return do_unmask_port_lm(s, port, do_unmask, shinfo, vcpu_info); } else { return do_unmask_port_compat(s, port, do_unmask, shinfo, vcpu_info); } } static int do_set_port_lm(XenEvtchnState *s, evtchn_port_t port, struct shared_info *shinfo, struct vcpu_info *vcpu_info) { const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); typeof(shinfo->evtchn_pending[0]) mask; int idx = port / bits_per_word; int offset = port % bits_per_word; mask = 1UL << offset; if (idx >= bits_per_word) { return -EINVAL; } /* Update the pending bit itself. If it was already set, we're done. */ if (qatomic_fetch_or(&shinfo->evtchn_pending[idx], mask) & mask) { return 0; } /* Check if it's masked. */ if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) { return 0; } /* Now on to the vcpu_info evtchn_pending_sel index... */ mask = 1UL << idx; /* If a port in this word was already pending for this vCPU, all done. */ if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) { return 0; } /* Set evtchn_upcall_pending for this vCPU */ if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) { return 0; } inject_callback(s, s->port_table[port].vcpu); return 0; } static int do_set_port_compat(XenEvtchnState *s, evtchn_port_t port, struct compat_shared_info *shinfo, struct compat_vcpu_info *vcpu_info) { const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); typeof(shinfo->evtchn_pending[0]) mask; int idx = port / bits_per_word; int offset = port % bits_per_word; mask = 1UL << offset; if (idx >= bits_per_word) { return -EINVAL; } /* Update the pending bit itself. If it was already set, we're done. */ if (qatomic_fetch_or(&shinfo->evtchn_pending[idx], mask) & mask) { return 0; } /* Check if it's masked. */ if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) { return 0; } /* Now on to the vcpu_info evtchn_pending_sel index... */ mask = 1UL << idx; /* If a port in this word was already pending for this vCPU, all done. */ if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) { return 0; } /* Set evtchn_upcall_pending for this vCPU */ if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) { return 0; } inject_callback(s, s->port_table[port].vcpu); return 0; } static int set_port_pending(XenEvtchnState *s, evtchn_port_t port) { void *vcpu_info, *shinfo; if (s->port_table[port].type == EVTCHNSTAT_closed) { return -EINVAL; } if (s->evtchn_in_kernel) { XenEvtchnPort *p = &s->port_table[port]; CPUState *cpu = qemu_get_cpu(p->vcpu); struct kvm_irq_routing_xen_evtchn evt; if (!cpu) { return 0; } evt.port = port; evt.vcpu = kvm_arch_vcpu_id(cpu); evt.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL; return kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_EVTCHN_SEND, &evt); } shinfo = xen_overlay_get_shinfo_ptr(); if (!shinfo) { return -ENOTSUP; } vcpu_info = kvm_xen_get_vcpu_info_hva(s->port_table[port].vcpu); if (!vcpu_info) { return -EINVAL; } if (xen_is_long_mode()) { return do_set_port_lm(s, port, shinfo, vcpu_info); } else { return do_set_port_compat(s, port, shinfo, vcpu_info); } } static int clear_port_pending(XenEvtchnState *s, evtchn_port_t port) { void *p = xen_overlay_get_shinfo_ptr(); if (!p) { return -ENOTSUP; } if (xen_is_long_mode()) { struct shared_info *shinfo = p; const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); typeof(shinfo->evtchn_pending[0]) mask; int idx = port / bits_per_word; int offset = port % bits_per_word; mask = 1UL << offset; qatomic_fetch_and(&shinfo->evtchn_pending[idx], ~mask); } else { struct compat_shared_info *shinfo = p; const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); typeof(shinfo->evtchn_pending[0]) mask; int idx = port / bits_per_word; int offset = port % bits_per_word; mask = 1UL << offset; qatomic_fetch_and(&shinfo->evtchn_pending[idx], ~mask); } return 0; } static void free_port(XenEvtchnState *s, evtchn_port_t port) { s->port_table[port].type = EVTCHNSTAT_closed; s->port_table[port].type_val = 0; s->port_table[port].vcpu = 0; if (s->nr_ports == port + 1) { do { s->nr_ports--; } while (s->nr_ports && s->port_table[s->nr_ports - 1].type == EVTCHNSTAT_closed); } /* Clear pending event to avoid unexpected behavior on re-bind. */ clear_port_pending(s, port); } static int allocate_port(XenEvtchnState *s, uint32_t vcpu, uint16_t type, uint16_t val, evtchn_port_t *port) { evtchn_port_t p = 1; for (p = 1; valid_port(p); p++) { if (s->port_table[p].type == EVTCHNSTAT_closed) { s->port_table[p].vcpu = vcpu; s->port_table[p].type = type; s->port_table[p].type_val = val; *port = p; if (s->nr_ports < p + 1) { s->nr_ports = p + 1; } return 0; } } return -ENOSPC; } static bool virq_is_global(uint32_t virq) { switch (virq) { case VIRQ_TIMER: case VIRQ_DEBUG: case VIRQ_XENOPROF: case VIRQ_XENPMU: return false; default: return true; } } static int close_port(XenEvtchnState *s, evtchn_port_t port) { XenEvtchnPort *p = &s->port_table[port]; switch (p->type) { case EVTCHNSTAT_closed: return -ENOENT; case EVTCHNSTAT_virq: kvm_xen_set_vcpu_virq(virq_is_global(p->type_val) ? 0 : p->vcpu, p->type_val, 0); break; case EVTCHNSTAT_ipi: if (s->evtchn_in_kernel) { deassign_kernel_port(port); } break; case EVTCHNSTAT_interdomain: if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) { /* Not yet implemented. This can't happen! */ } else { /* Loopback interdomain */ XenEvtchnPort *rp = &s->port_table[p->type_val]; if (!valid_port(p->type_val) || rp->type_val != port || rp->type != EVTCHNSTAT_interdomain) { error_report("Inconsistent state for interdomain unbind"); } else { /* Set the other end back to unbound */ rp->type = EVTCHNSTAT_unbound; rp->type_val = 0; } } break; default: break; } free_port(s, port); return 0; } int xen_evtchn_soft_reset(void) { XenEvtchnState *s = xen_evtchn_singleton; int i; if (!s) { return -ENOTSUP; } assert(qemu_mutex_iothread_locked()); QEMU_LOCK_GUARD(&s->port_lock); for (i = 0; i < s->nr_ports; i++) { close_port(s, i); } return 0; } int xen_evtchn_reset_op(struct evtchn_reset *reset) { if (reset->dom != DOMID_SELF && reset->dom != xen_domid) { return -ESRCH; } return xen_evtchn_soft_reset(); } int xen_evtchn_close_op(struct evtchn_close *close) { XenEvtchnState *s = xen_evtchn_singleton; int ret; if (!s) { return -ENOTSUP; } if (!valid_port(close->port)) { return -EINVAL; } qemu_mutex_lock(&s->port_lock); ret = close_port(s, close->port); qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_unmask_op(struct evtchn_unmask *unmask) { XenEvtchnState *s = xen_evtchn_singleton; int ret; if (!s) { return -ENOTSUP; } if (!valid_port(unmask->port)) { return -EINVAL; } qemu_mutex_lock(&s->port_lock); ret = unmask_port(s, unmask->port, true); qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_bind_vcpu_op(struct evtchn_bind_vcpu *vcpu) { XenEvtchnState *s = xen_evtchn_singleton; XenEvtchnPort *p; int ret = -EINVAL; if (!s) { return -ENOTSUP; } if (!valid_port(vcpu->port)) { return -EINVAL; } if (!valid_vcpu(vcpu->vcpu)) { return -ENOENT; } qemu_mutex_lock(&s->port_lock); p = &s->port_table[vcpu->port]; if (p->type == EVTCHNSTAT_interdomain || p->type == EVTCHNSTAT_unbound || p->type == EVTCHNSTAT_pirq || (p->type == EVTCHNSTAT_virq && virq_is_global(p->type_val))) { /* * unmask_port() with do_unmask==false will just raise the event * on the new vCPU if the port was already pending. */ p->vcpu = vcpu->vcpu; unmask_port(s, vcpu->port, false); ret = 0; } qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq) { XenEvtchnState *s = xen_evtchn_singleton; int ret; if (!s) { return -ENOTSUP; } if (virq->virq >= NR_VIRQS) { return -EINVAL; } /* Global VIRQ must be allocated on vCPU0 first */ if (virq_is_global(virq->virq) && virq->vcpu != 0) { return -EINVAL; } if (!valid_vcpu(virq->vcpu)) { return -ENOENT; } qemu_mutex_lock(&s->port_lock); ret = allocate_port(s, virq->vcpu, EVTCHNSTAT_virq, virq->virq, &virq->port); if (!ret) { ret = kvm_xen_set_vcpu_virq(virq->vcpu, virq->virq, virq->port); if (ret) { free_port(s, virq->port); } } qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi) { XenEvtchnState *s = xen_evtchn_singleton; int ret; if (!s) { return -ENOTSUP; } if (!valid_vcpu(ipi->vcpu)) { return -ENOENT; } qemu_mutex_lock(&s->port_lock); ret = allocate_port(s, ipi->vcpu, EVTCHNSTAT_ipi, 0, &ipi->port); if (!ret && s->evtchn_in_kernel) { assign_kernel_port(EVTCHNSTAT_ipi, ipi->port, ipi->vcpu); } qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain) { XenEvtchnState *s = xen_evtchn_singleton; uint16_t type_val; int ret; if (!s) { return -ENOTSUP; } if (interdomain->remote_dom == DOMID_QEMU) { type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU; } else if (interdomain->remote_dom == DOMID_SELF || interdomain->remote_dom == xen_domid) { type_val = 0; } else { return -ESRCH; } if (!valid_port(interdomain->remote_port)) { return -EINVAL; } qemu_mutex_lock(&s->port_lock); /* The newly allocated port starts out as unbound */ ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val, &interdomain->local_port); if (ret) { goto out; } if (interdomain->remote_dom == DOMID_QEMU) { /* We haven't hooked up QEMU's PV drivers to this yet */ ret = -ENOSYS; } else { /* Loopback */ XenEvtchnPort *rp = &s->port_table[interdomain->remote_port]; XenEvtchnPort *lp = &s->port_table[interdomain->local_port]; if (rp->type == EVTCHNSTAT_unbound && rp->type_val == 0) { /* It's a match! */ rp->type = EVTCHNSTAT_interdomain; rp->type_val = interdomain->local_port; lp->type = EVTCHNSTAT_interdomain; lp->type_val = interdomain->remote_port; } else { ret = -EINVAL; } } if (ret) { free_port(s, interdomain->local_port); } out: qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc) { XenEvtchnState *s = xen_evtchn_singleton; uint16_t type_val; int ret; if (!s) { return -ENOTSUP; } if (alloc->dom != DOMID_SELF && alloc->dom != xen_domid) { return -ESRCH; } if (alloc->remote_dom == DOMID_QEMU) { type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU; } else if (alloc->remote_dom == DOMID_SELF || alloc->remote_dom == xen_domid) { type_val = 0; } else { return -EPERM; } qemu_mutex_lock(&s->port_lock); ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val, &alloc->port); qemu_mutex_unlock(&s->port_lock); return ret; } int xen_evtchn_send_op(struct evtchn_send *send) { XenEvtchnState *s = xen_evtchn_singleton; XenEvtchnPort *p; int ret = 0; if (!s) { return -ENOTSUP; } if (!valid_port(send->port)) { return -EINVAL; } qemu_mutex_lock(&s->port_lock); p = &s->port_table[send->port]; switch (p->type) { case EVTCHNSTAT_interdomain: if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) { /* * This is an event from the guest to qemu itself, which is * serving as the driver domain. Not yet implemented; it will * be hooked up to the qemu implementation of xenstore, * console, PV net/block drivers etc. */ ret = -ENOSYS; } else { /* Loopback interdomain ports; just a complex IPI */ set_port_pending(s, p->type_val); } break; case EVTCHNSTAT_ipi: set_port_pending(s, send->port); break; case EVTCHNSTAT_unbound: /* Xen will silently drop these */ break; default: ret = -EINVAL; break; } qemu_mutex_unlock(&s->port_lock); return ret; } EvtchnInfoList *qmp_xen_event_list(Error **errp) { XenEvtchnState *s = xen_evtchn_singleton; EvtchnInfoList *head = NULL, **tail = &head; void *shinfo, *pending, *mask; int i; if (!s) { error_setg(errp, "Xen event channel emulation not enabled"); return NULL; } shinfo = xen_overlay_get_shinfo_ptr(); if (!shinfo) { error_setg(errp, "Xen shared info page not allocated"); return NULL; } if (xen_is_long_mode()) { pending = shinfo + offsetof(struct shared_info, evtchn_pending); mask = shinfo + offsetof(struct shared_info, evtchn_mask); } else { pending = shinfo + offsetof(struct compat_shared_info, evtchn_pending); mask = shinfo + offsetof(struct compat_shared_info, evtchn_mask); } QEMU_LOCK_GUARD(&s->port_lock); for (i = 0; i < s->nr_ports; i++) { XenEvtchnPort *p = &s->port_table[i]; EvtchnInfo *info; if (p->type == EVTCHNSTAT_closed) { continue; } info = g_new0(EvtchnInfo, 1); info->port = i; qemu_build_assert(EVTCHN_PORT_TYPE_CLOSED == EVTCHNSTAT_closed); qemu_build_assert(EVTCHN_PORT_TYPE_UNBOUND == EVTCHNSTAT_unbound); qemu_build_assert(EVTCHN_PORT_TYPE_INTERDOMAIN == EVTCHNSTAT_interdomain); qemu_build_assert(EVTCHN_PORT_TYPE_PIRQ == EVTCHNSTAT_pirq); qemu_build_assert(EVTCHN_PORT_TYPE_VIRQ == EVTCHNSTAT_virq); qemu_build_assert(EVTCHN_PORT_TYPE_IPI == EVTCHNSTAT_ipi); info->type = p->type; if (p->type == EVTCHNSTAT_interdomain) { info->remote_domain = g_strdup((p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) ? "qemu" : "loopback"); info->target = p->type_val & PORT_INFO_TYPEVAL_REMOTE_PORT_MASK; } else { info->target = p->type_val; } info->vcpu = p->vcpu; info->pending = test_bit(i, pending); info->masked = test_bit(i, mask); QAPI_LIST_APPEND(tail, info); } return head; } void qmp_xen_event_inject(uint32_t port, Error **errp) { XenEvtchnState *s = xen_evtchn_singleton; if (!s) { error_setg(errp, "Xen event channel emulation not enabled"); return; } if (!valid_port(port)) { error_setg(errp, "Invalid port %u", port); } QEMU_LOCK_GUARD(&s->port_lock); if (set_port_pending(s, port)) { error_setg(errp, "Failed to set port %u", port); return; } } void hmp_xen_event_list(Monitor *mon, const QDict *qdict) { EvtchnInfoList *iter, *info_list; Error *err = NULL; info_list = qmp_xen_event_list(&err); if (err) { hmp_handle_error(mon, err); return; } for (iter = info_list; iter; iter = iter->next) { EvtchnInfo *info = iter->value; monitor_printf(mon, "port %4u: vcpu: %d %s", info->port, info->vcpu, EvtchnPortType_str(info->type)); if (info->type != EVTCHN_PORT_TYPE_IPI) { monitor_printf(mon, "("); if (info->remote_domain) { monitor_printf(mon, "%s:", info->remote_domain); } monitor_printf(mon, "%d)", info->target); } if (info->pending) { monitor_printf(mon, " PENDING"); } if (info->masked) { monitor_printf(mon, " MASKED"); } monitor_printf(mon, "\n"); } qapi_free_EvtchnInfoList(info_list); } void hmp_xen_event_inject(Monitor *mon, const QDict *qdict) { int port = qdict_get_int(qdict, "port"); Error *err = NULL; qmp_xen_event_inject(port, &err); if (err) { hmp_handle_error(mon, err); } else { monitor_printf(mon, "Delivered port %d\n", port); } }