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KVM: SVM: add intercept for machine check exception 

To properly forward a MCE occured while the guest is running to the host, we
have to intercept this exception and call the host handler by hand. This is
implemented by this patch.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Joerg Roedel 2008-04-09 14:15:30 +02:00 committed by Avi Kivity
parent 6394b6494c
commit 53371b5098
2 changed files with 17 additions and 1 deletions
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17
arch/x86/kvm/svm.c
View File

@ -507,7 +507,8 @@ static void init_vmcb(struct vcpu_svm *svm)
INTERCEPT_DR7_MASK;
control->intercept_exceptions = (1 << PF_VECTOR) |
(1 << UD_VECTOR);
(1 << UD_VECTOR) |
(1 << MC_VECTOR);
control->intercept = (1ULL << INTERCEPT_INTR) |
@ -1044,6 +1045,19 @@ static int nm_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
return 1;
}
static int mc_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
{
/*
* On an #MC intercept the MCE handler is not called automatically in
* the host. So do it by hand here.
*/
asm volatile (
"int $0x12\n");
/* not sure if we ever come back to this point */
return 1;
}
static int shutdown_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
{
/*
@ -1367,6 +1381,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
[SVM_EXIT_EXCP_BASE + UD_VECTOR] = ud_interception,
[SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception,
[SVM_EXIT_EXCP_BASE + NM_VECTOR] = nm_interception,
[SVM_EXIT_EXCP_BASE + MC_VECTOR] = mc_interception,
[SVM_EXIT_INTR] = nop_on_interception,
[SVM_EXIT_NMI] = nop_on_interception,
[SVM_EXIT_SMI] = nop_on_interception,

1
include/asm-x86/kvm_host.h
View File

@ -62,6 +62,7 @@
#define SS_VECTOR 12
#define GP_VECTOR 13
#define PF_VECTOR 14
#define MC_VECTOR 18
#define SELECTOR_TI_MASK (1 << 2)
#define SELECTOR_RPL_MASK 0x03