hw/xen: Implement EVTCHNOP_reset
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
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@ -12,6 +12,7 @@
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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#include "qemu/module.h"
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#include "qemu/lockable.h"
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#include "qemu/main-loop.h"
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#include "qemu/log.h"
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#include "qapi/error.h"
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@ -747,6 +748,35 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port)
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return 0;
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}
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int xen_evtchn_soft_reset(void)
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{
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XenEvtchnState *s = xen_evtchn_singleton;
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int i;
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if (!s) {
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return -ENOTSUP;
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}
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assert(qemu_mutex_iothread_locked());
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QEMU_LOCK_GUARD(&s->port_lock);
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for (i = 0; i < s->nr_ports; i++) {
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close_port(s, i);
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}
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return 0;
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}
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int xen_evtchn_reset_op(struct evtchn_reset *reset)
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{
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if (reset->dom != DOMID_SELF && reset->dom != xen_domid) {
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return -ESRCH;
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}
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return xen_evtchn_soft_reset();
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}
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int xen_evtchn_close_op(struct evtchn_close *close)
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{
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XenEvtchnState *s = xen_evtchn_singleton;
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@ -13,6 +13,7 @@
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#define QEMU_XEN_EVTCHN_H
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void xen_evtchn_create(void);
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int xen_evtchn_soft_reset(void);
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int xen_evtchn_set_callback_param(uint64_t param);
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struct evtchn_status;
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@ -24,6 +25,7 @@ struct evtchn_send;
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struct evtchn_alloc_unbound;
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struct evtchn_bind_interdomain;
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struct evtchn_bind_vcpu;
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struct evtchn_reset;
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int xen_evtchn_status_op(struct evtchn_status *status);
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int xen_evtchn_close_op(struct evtchn_close *close);
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int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
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@ -33,5 +35,6 @@ int xen_evtchn_send_op(struct evtchn_send *send);
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int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
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int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain);
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int xen_evtchn_bind_vcpu_op(struct evtchn_bind_vcpu *vcpu);
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int xen_evtchn_reset_op(struct evtchn_reset *reset);
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#endif /* QEMU_XEN_EVTCHN_H */
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@ -964,6 +964,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
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err = xen_evtchn_bind_vcpu_op(&vcpu);
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break;
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}
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case EVTCHNOP_reset: {
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struct evtchn_reset reset;
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qemu_build_assert(sizeof(reset) == 2);
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if (kvm_copy_from_gva(cs, arg, &reset, sizeof(reset))) {
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err = -EFAULT;
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break;
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}
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err = xen_evtchn_reset_op(&reset);
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break;
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}
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default:
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return false;
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}
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@ -981,6 +993,11 @@ int kvm_xen_soft_reset(void)
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trace_kvm_xen_soft_reset();
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err = xen_evtchn_soft_reset();
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if (err) {
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return err;
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}
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/*
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* Zero is the reset/startup state for HVM_PARAM_CALLBACK_IRQ. Strictly,
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* it maps to HVM_PARAM_CALLBACK_TYPE_GSI with GSI#0, but Xen refuses to
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