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kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS

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commit 691bd4340b 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>
This commit is contained in:
Haozhong Zhang
2017-07-04 10:27:41 +08:00
committed by Greg Kroah-Hartman
parent 6ffa92ffae
commit 3ed43caedf
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kvm/vmx.c
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@@ -2812,7 +2812,8 @@ 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;
@@ -2889,7 +2890,8 @@ 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))