[PATCH 2/2 v3] kvm: set exit_reason to KVM_EXIT_GUEST_PANICKED when guest panicked

[Wen Congyang <wency@cn.fujitsu.com>]

This patch introduces new request bit KVM_REQ_GUEST_PANICEKD.
If this bit is set, set vcpu's exit_reason to KVM_EXIT_GUEST_PANICKED.
And then the user space can know the guest panicked.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 arch/x86/kvm/x86.c       |   11 +++++++++++
 include/linux/kvm.h      |    1 +
 include/linux/kvm_host.h |    1 +
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c9d99e5..978e398 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5013,6 +5013,10 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
 	case KVM_HC_VAPIC_POLL_IRQ:
 		ret = 0;
 		break;
+	case KVM_HC_GUEST_PANICKED:
+		ret = 0;
+		kvm_make_request(KVM_REQ_GUEST_PANICKED, vcpu);
+		break;
 	default:
 		ret = -KVM_ENOSYS;
 		break;
@@ -5228,6 +5232,13 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 			r = 0;
 			goto out;
 		}
+
+		if (kvm_check_request(KVM_REQ_GUEST_PANICKED, vcpu)) {
+			vcpu->run->exit_reason = KVM_EXIT_GUEST_PANICKED;
+			r = 0;
+			goto out;
+		}
+
 		if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
 			vcpu->fpu_active = 0;
 			kvm_x86_ops->fpu_deactivate(vcpu);
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index acbe429..a46052e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -163,6 +163,7 @@ struct kvm_pit_config {
 #define KVM_EXIT_OSI              18
 #define KVM_EXIT_PAPR_HCALL	  19
 #define KVM_EXIT_S390_UCONTROL	  20
+#define KVM_EXIT_GUEST_PANICKED	  21
 
 /* For KVM_EXIT_INTERNAL_ERROR */
 #define KVM_INTERNAL_ERROR_EMULATION 1
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 355e445..026bbe5 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -54,6 +54,7 @@
 #define KVM_REQ_IMMEDIATE_EXIT    15
 #define KVM_REQ_PMU               16
 #define KVM_REQ_PMI               17
+#define KVM_REQ_GUEST_PANICKED     18
 
 #define KVM_USERSPACE_IRQ_SOURCE_ID	0
 
-- 
1.7.1