lkml.org 
[lkml]   [2009]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 35/47] KVM: ignore AMDs HWCR register access to set the FFDIS bit
Date
From: Andre Przywara <andre.przywara@amd.com>

Linux tries to disable the flush filter on all AMD K8 CPUs. Since KVM
does not handle the needed MSR, the injected #GP will panic the Linux
kernel. Ignore setting of the HWCR.FFDIS bit in this MSR to let Linux
boot with an AMD K8 family guest CPU.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/svm.c | 1 -
arch/x86/kvm/x86.c | 8 ++++++++
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 081d00a..d664157 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2138,7 +2138,6 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
break;
case MSR_VM_CR:
case MSR_VM_IGNNE:
- case MSR_K7_HWCR:
pr_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
break;
default:
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e9b0982..cae5b12 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -833,6 +833,14 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
case MSR_EFER:
set_efer(vcpu, data);
break;
+ case MSR_K7_HWCR:
+ data &= ~(u64)0x40; /* ignore flush filter disable */
+ if (data != 0) {
+ pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
+ data);
+ return 1;
+ }
+ break;
case MSR_IA32_DEBUGCTLMSR:
if (!data) {
/* We support the non-activated case already */
--
1.6.3.3


\
 
 \ /
  Last update: 2009-08-19 15:17    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site