From: Joerg Roedel <joerg.roedel@amd.com>
Date: Wed, 9 Apr 2008 12:15:30 +0000 (+0200)
Subject: KVM: SVM: add intercept for machine check exception
X-Git-Tag: v2.6.26-rc1~1028^2~26
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=53371b5098543ab09dcb0c7ce31da887dbe58c62;p=linux-2.6-omap-h63xx.git

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>
---

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8af463b9152..da3ddef4760 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 de3eccfb767..286117878ce 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