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[PATCH] KVM: SVM: Propagate cpu shutdown events to userspace

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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>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joerg Roedel 2007-01-26 00:56:42 -08:00 committed by Linus Torvalds
parent 73b1087e61
commit 46fe4ddd9d
2 changed files with 16 additions and 0 deletions
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15
drivers/kvm/svm.c
View file

@ -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 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 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,

1
include/linux/kvm.h
View file

@ -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 */