From: Joerg Roedel <[email protected]>
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 <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
Index: linux-2.6/include/linux/kvm.h
===================================================================
--- linux-2.6.orig/include/linux/kvm.h
+++ linux-2.6/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 */
Index: linux-2.6/drivers/kvm/svm.c
===================================================================
--- linux-2.6.orig/drivers/kvm/svm.c
+++ linux-2.6/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_vc
return 0;
}
+static int shutdown_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ /*
+ * VMCB is undefined after a SHUTDOWN intercept
+ * so reinitialize 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
[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,
-
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