[Qemu-devel] [PATCH 8/12] kvm/x86: add sending hyper-v crash notification to user space

[Denis V. Lunev]

From: Andrey Smetanin <address@hidden>

Sending of notification is done by exiting vcpu to user space
if KVM_REQ_HV_CRASH is enabled for vcpu. At exit to user space
the kvm_run structure contains system_event with type
KVM_SYSTEM_EVENT_CRASH to notify about guest crash occured.

Signed-off-by: Andrey Smetanin <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
Reviewed-by: Peter Hornyack <address@hidden>
CC: Paolo Bonzini <address@hidden>
CC: Gleb Natapov <address@hidden>
---
 Documentation/virtual/kvm/api.txt | 5 +++++
 arch/x86/kvm/x86.c                | 6 ++++++
 include/uapi/linux/kvm.h          | 1 +
 3 files changed, 12 insertions(+)

diff --git a/Documentation/virtual/kvm/api.txt 
b/Documentation/virtual/kvm/api.txt
index a7926a9..a4ebcb7 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3277,6 +3277,7 @@ should put the acknowledged interrupt vector into the 
'epr' field.
                struct {
 #define KVM_SYSTEM_EVENT_SHUTDOWN       1
 #define KVM_SYSTEM_EVENT_RESET          2
+#define KVM_SYSTEM_EVENT_CRASH          3
                        __u32 type;
                        __u64 flags;
                } system_event;
@@ -3296,6 +3297,10 @@ Valid values for 'type' are:
   KVM_SYSTEM_EVENT_RESET -- the guest has requested a reset of the VM.
    As with SHUTDOWN, userspace can choose to ignore the request, or
    to schedule the reset to occur in the future and may call KVM_RUN again.
+  KVM_SYSTEM_EVENT_CRASH -- the guest crash occurred and the guest
+   has requested a crash condition maintenance. Userspace can choose
+   to ignore the request, or to gather VM memory core dump and/or
+   reset/shutdown of the VM.
 
                /* Fix the size of the union. */
                char padding[256];
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b4c2767..28e79c0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6265,6 +6265,12 @@ 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;
+                       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 5da4ca3..c8c6b8b 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -317,6 +317,7 @@ struct kvm_run {
                struct {
 #define KVM_SYSTEM_EVENT_SHUTDOWN       1
 #define KVM_SYSTEM_EVENT_RESET          2
+#define KVM_SYSTEM_EVENT_CRASH          3
                        __u32 type;
                        __u64 flags;
                } system_event;
-- 
2.1.4