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authorHaozhong Zhang <haozhong.zhang@intel.com>2015-12-14 16:13:38 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2015-12-14 16:24:08 +0100
commit81b1b9ca6d5ca5f3ce91c0095402def657cf5db3 (patch)
treefc3236bad5adb9d6833e8b59f49b7378410cacb9 /arch
parentMerge branch 'kvm-ppc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git... (diff)
downloadlinux-81b1b9ca6d5ca5f3ce91c0095402def657cf5db3.tar.xz
linux-81b1b9ca6d5ca5f3ce91c0095402def657cf5db3.zip
KVM: VMX: Fix host initiated access to guest MSR_TSC_AUX
The current handling of accesses to guest MSR_TSC_AUX returns error if vcpu does not support rdtscp, though those accesses are initiated by host. This can result in the reboot failure of some versions of QEMU. This patch fixes this issue by passing those host initiated accesses for further handling instead. Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6b5605607849..44976a596fa6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2803,7 +2803,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = vcpu->arch.ia32_xss;
break;
case MSR_TSC_AUX:
- if (!guest_cpuid_has_rdtscp(vcpu))
+ if (!guest_cpuid_has_rdtscp(vcpu) && !msr_info->host_initiated)
return 1;
/* Otherwise falls through */
default:
@@ -2909,7 +2909,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
clear_atomic_switch_msr(vmx, MSR_IA32_XSS);
break;
case MSR_TSC_AUX:
- if (!guest_cpuid_has_rdtscp(vcpu))
+ if (!guest_cpuid_has_rdtscp(vcpu) && !msr_info->host_initiated)
return 1;
/* Check reserved bit, higher 32 bits should be zero */
if ((data >> 32) != 0)