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Commit 2ce79189 authored by Andrey Smetanin's avatar Andrey Smetanin Committed by Paolo Bonzini
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kvm/x86: add sending hyper-v crash notification to user space 



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 occurred.

Signed-off-by: default avatarAndrey Smetanin <asmetanin@virtuozzo.com>
Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
Reviewed-by: default avatarPeter Hornyack <peterhornyack@google.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Gleb Natapov <gleb@kernel.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent e7d9513b

Documentation/virtual/kvm/api.txt

+5 −0
Original line number Diff line number Diff line
@@ -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];

arch/x86/kvm/x86.c

+6 −0
Original line number Diff line number Diff line
@@ -6263,6 +6263,12 @@ 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) {

include/linux/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -139,6 +139,7 @@ static inline bool is_error_page(struct page *page) 
#define KVM_REQ_DISABLE_IBS       24

#define KVM_REQ_APIC_PAGE_RELOAD  25

#define KVM_REQ_SMI               26

#define KVM_REQ_HV_CRASH          27



#define KVM_USERSPACE_IRQ_SOURCE_ID		0

#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID	1

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -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;