From: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
Sending of notification is done by exiting vcpu to user space
if KVM_REQ_HV_CRASH is enabled for vcpu. kvm_run structure
will contains system_event with type KVM_SYSTEM_EVENT_CRASH
and flag KVM_SYSTEM_EVENT_FL_HV_CRASH to clarify that
crash occures inside Hyper-V based guest.
Signed-off-by: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
Signed-off-by: Denis V. Lunev <den@xxxxxxxxxx>
CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
CC: Gleb Natapov <gleb@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 8 ++++++++
include/uapi/linux/kvm.h | 2 ++
2 files changed, 10 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 47b7507..55a4b92 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6264,6 +6264,14 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
vcpu_scan_ioapic(vcpu);
if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
kvm_vcpu_reload_apic_access_page(vcpu);
+ if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) {
+ vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+ vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
+ vcpu->run->system_event.flags =
+ KVM_SYSTEM_EVENT_FL_HV_CRASH;
+ r = 0;
+ goto out;
+ }
}
if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 716ad4a..eefb8b9 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -317,6 +317,8 @@ struct kvm_run {
struct {
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
+#define KVM_SYSTEM_EVENT_CRASH 3
+#define KVM_SYSTEM_EVENT_FL_HV_CRASH (1ULL << 0)
__u32 type;
__u64 flags;
} system_event;
--
2.1.4
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