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authorDavid Woodhouse <dwmw@amazon.co.uk>2022-12-14 19:36:15 +0000
committerDavid Woodhouse <dwmw@amazon.co.uk>2023-03-01 08:22:50 +0000
commita15b10978fe62411936e577288f28184a41754a9 (patch)
treed82c63191d9f43db47ca708fcddbb3f7712c46d5
parent306670461bb19e7af42b3d68d007d7690efd2334 (diff)
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hw/xen: Implement EVTCHNOP_reset
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
-rw-r--r--hw/i386/kvm/xen_evtchn.c30
-rw-r--r--hw/i386/kvm/xen_evtchn.h3
-rw-r--r--target/i386/kvm/xen-emu.c17
3 files changed, 50 insertions, 0 deletions
diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index cbaf4f5..c804a31 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -12,6 +12,7 @@
#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 "qapi/error.h"
@@ -747,6 +748,35 @@ static int close_port(XenEvtchnState *s, evtchn_port_t 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;
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index 486b031..5d3e035 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -13,6 +13,7 @@
#define QEMU_XEN_EVTCHN_H
void xen_evtchn_create(void);
+int xen_evtchn_soft_reset(void);
int xen_evtchn_set_callback_param(uint64_t param);
struct evtchn_status;
@@ -24,6 +25,7 @@ struct evtchn_send;
struct evtchn_alloc_unbound;
struct evtchn_bind_interdomain;
struct evtchn_bind_vcpu;
+struct evtchn_reset;
int xen_evtchn_status_op(struct evtchn_status *status);
int xen_evtchn_close_op(struct evtchn_close *close);
int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
@@ -33,5 +35,6 @@ int xen_evtchn_send_op(struct evtchn_send *send);
int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain);
int xen_evtchn_bind_vcpu_op(struct evtchn_bind_vcpu *vcpu);
+int xen_evtchn_reset_op(struct evtchn_reset *reset);
#endif /* QEMU_XEN_EVTCHN_H */
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 8dc0d32..821629f 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -964,6 +964,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
err = xen_evtchn_bind_vcpu_op(&vcpu);
break;
}
+ case EVTCHNOP_reset: {
+ struct evtchn_reset reset;
+
+ qemu_build_assert(sizeof(reset) == 2);
+ if (kvm_copy_from_gva(cs, arg, &reset, sizeof(reset))) {
+ err = -EFAULT;
+ break;
+ }
+
+ err = xen_evtchn_reset_op(&reset);
+ break;
+ }
default:
return false;
}
@@ -981,6 +993,11 @@ int kvm_xen_soft_reset(void)
trace_kvm_xen_soft_reset();
+ err = xen_evtchn_soft_reset();
+ if (err) {
+ return err;
+ }
+
/*
* Zero is the reset/startup state for HVM_PARAM_CALLBACK_IRQ. Strictly,
* it maps to HVM_PARAM_CALLBACK_TYPE_GSI with GSI#0, but Xen refuses to