| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.2 330/413] KVM: VMX: check CPUID before allowing read/write of IA32_XSS | Date | Wed, 24 Jul 2019 21:20:21 +0200 |
| |
From: Wanpeng Li <wanpengli@tencent.com>
commit 4d763b168e9c5c366b05812c7bba7662e5ea3669 upstream.
Raise #GP when guest read/write IA32_XSS, but the CPUID bits say that it shouldn't exist.
Fixes: 203000993de5 (kvm: vmx: add MSR logic for XSAVES) Reported-by: Xiaoyao Li <xiaoyao.li@linux.intel.com> Reported-by: Tao Xu <tao3.xu@intel.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/kvm/vmx/vmx.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1718,7 +1718,10 @@ static int vmx_get_msr(struct kvm_vcpu * return vmx_get_vmx_msr(&vmx->nested.msrs, msr_info->index, &msr_info->data); case MSR_IA32_XSS: - if (!vmx_xsaves_supported()) + if (!vmx_xsaves_supported() || + (!msr_info->host_initiated && + !(guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && + guest_cpuid_has(vcpu, X86_FEATURE_XSAVES)))) return 1; msr_info->data = vcpu->arch.ia32_xss; break; @@ -1933,7 +1936,10 @@ static int vmx_set_msr(struct kvm_vcpu * return 1; return vmx_set_vmx_msr(vcpu, msr_index, data); case MSR_IA32_XSS: - if (!vmx_xsaves_supported()) + if (!vmx_xsaves_supported() || + (!msr_info->host_initiated && + !(guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && + guest_cpuid_has(vcpu, X86_FEATURE_XSAVES)))) return 1; /* * The only supported bit as of Skylake is bit 8, but
|