[PATCH] KVM: propagate SHUTDOWN intercept to userspace on SVM

["Joerg Roedel" <joerg.roedel@amd.com>]

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This patch implements forwarding of SHUTDOWN intercepts from the guest
on to userspace on AMD SVM. A SHUTDOWN event occurs when the guest produces
a triple fault (e.g. on reboot). This also fixes the bug that a guest
reboot actually causes a host reboot under some circumstances.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

-- 
Joerg Roedel
Operating System Research Center
AMD Saxony LLC & Co. KG

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diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 714f6a7..1bbaa16 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -502,6 +502,7 @@ static void init_vmcb(struct vmcb *vmcb)
 				(1ULL << INTERCEPT_IOIO_PROT) |
 				(1ULL << INTERCEPT_MSR_PROT) |
 				(1ULL << INTERCEPT_TASK_SWITCH) |
+				(1ULL << INTERCEPT_SHUTDOWN) |
 				(1ULL << INTERCEPT_VMRUN) |
 				(1ULL << INTERCEPT_VMMCALL) |
 				(1ULL << INTERCEPT_VMLOAD) |
@@ -892,6 +893,19 @@ static int pf_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	return 0;
 }
 
+static int shutdown_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+	/* 
+	 * VMCB is undefined after a SHUTDOWN intercept 
+	 * so reinitalize it
+	 */
+	memset(vcpu->svm->vmcb, 0, PAGE_SIZE);
+	init_vmcb(vcpu->svm->vmcb);
+
+	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
+	return 0;
+}
+
 static int io_get_override(struct kvm_vcpu *vcpu,
 			  struct vmcb_seg **seg,
 			  int *addr_override)
@@ -1249,6 +1263,7 @@ static int (*svm_exit_handlers[])(struct kvm_vcpu *vcpu,
 	[SVM_EXIT_IOIO] 		  	= io_interception,
 	[SVM_EXIT_MSR]				= msr_interception,
 	[SVM_EXIT_TASK_SWITCH]			= task_switch_interception,
+	[SVM_EXIT_SHUTDOWN]			= shutdown_interception,
 	[SVM_EXIT_VMRUN]			= invalid_op_interception,
 	[SVM_EXIT_VMMCALL]			= invalid_op_interception,
 	[SVM_EXIT_VMLOAD]			= invalid_op_interception,
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index bc8b461..1be148f 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -46,6 +46,7 @@ enum kvm_exit_reason {
 	KVM_EXIT_HLT              = 5,
 	KVM_EXIT_MMIO             = 6,
 	KVM_EXIT_IRQ_WINDOW_OPEN  = 7,
+	KVM_EXIT_SHUTDOWN         = 8,
 };
 
 /* for KVM_RUN */