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authorJoerg Roedel <joerg.roedel@amd.com>2008-02-13 16:30:28 +0100
committerAvi Kivity <avi@qumranet.com>2008-03-04 15:19:45 +0200
commita2938c807024ba30191e3bd593430c0659d75717 (patch)
tree10c1776fc6e2fc49b2d9b5f8ffa5078f0f34cca9 /arch/x86
parent72dc67a69690288538142df73a7e3ac66fea68dc (diff)
downloadlinux-a2938c807024ba30191e3bd593430c0659d75717.tar.bz2
KVM: SVM: fix Windows XP 64 bit installation crash
While installing Windows XP 64 bit wants to access the DEBUGCTL and the last branch record (LBR) MSRs. Don't allowing this in KVM causes the installation to crash. This patch allow the access to these MSRs and fixes the issue. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Markus Rechberger <markus.rechberger@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/svm.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d71daabbb51b..1a582f1090e8 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1100,6 +1100,24 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
case MSR_IA32_SYSENTER_ESP:
*data = svm->vmcb->save.sysenter_esp;
break;
+ /* Nobody will change the following 5 values in the VMCB so
+ we can safely return them on rdmsr. They will always be 0
+ until LBRV is implemented. */
+ case MSR_IA32_DEBUGCTLMSR:
+ *data = svm->vmcb->save.dbgctl;
+ break;
+ case MSR_IA32_LASTBRANCHFROMIP:
+ *data = svm->vmcb->save.br_from;
+ break;
+ case MSR_IA32_LASTBRANCHTOIP:
+ *data = svm->vmcb->save.br_to;
+ break;
+ case MSR_IA32_LASTINTFROMIP:
+ *data = svm->vmcb->save.last_excp_from;
+ break;
+ case MSR_IA32_LASTINTTOIP:
+ *data = svm->vmcb->save.last_excp_to;
+ break;
default:
return kvm_get_msr_common(vcpu, ecx, data);
}
@@ -1160,6 +1178,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
case MSR_IA32_SYSENTER_ESP:
svm->vmcb->save.sysenter_esp = data;
break;
+ case MSR_IA32_DEBUGCTLMSR:
+ pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
+ __FUNCTION__, data);
+ break;
case MSR_K7_EVNTSEL0:
case MSR_K7_EVNTSEL1:
case MSR_K7_EVNTSEL2: