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authorHaozhong Zhang <haozhong.zhang@intel.com>2017-07-04 10:27:41 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-21 07:00:16 +0200
commitc69bb567124fd43fcbf439318216556e4259c11f (patch)
treebc6ee4bbc87e435ed9620b75f03cfcff399f0b58
parentbedb27f7481485fee092611409da00f1ce345c4a (diff)
kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS
commit 691bd4340bef49cf7e5855d06cf24444b5bf2d85 upstream. It's easier for host applications, such as QEMU, if they can always access guest MSR_IA32_BNDCFGS in VMCS, even though MPX is disabled in guest cpuid. Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kvm/vmx.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f5b9dae409e7..9e1656611df3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3200,7 +3200,8 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = vmcs_readl(GUEST_SYSENTER_ESP);
break;
case MSR_IA32_BNDCFGS:
- if (!kvm_mpx_supported() || !guest_cpuid_has_mpx(vcpu))
+ if (!kvm_mpx_supported() ||
+ (!msr_info->host_initiated && !guest_cpuid_has_mpx(vcpu)))
return 1;
msr_info->data = vmcs_read64(GUEST_BNDCFGS);
break;
@@ -3282,7 +3283,8 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
vmcs_writel(GUEST_SYSENTER_ESP, data);
break;
case MSR_IA32_BNDCFGS:
- if (!kvm_mpx_supported() || !guest_cpuid_has_mpx(vcpu))
+ if (!kvm_mpx_supported() ||
+ (!msr_info->host_initiated && !guest_cpuid_has_mpx(vcpu)))
return 1;
if (is_noncanonical_address(data & PAGE_MASK) ||
(data & MSR_IA32_BNDCFGS_RSVD))