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Subject[PATCH 05/31] KVM: SVM: add intercept for machine check exception
Date
From: Joerg Roedel <joerg.roedel@amd.com>

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>
---
arch/x86/kvm/svm.c | 17 ++++++++++++++++-
include/asm-x86/kvm_host.h | 1 +
2 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8af463b..da3ddef 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -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,
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index de3eccf..2861178 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -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
--
1.5.5


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