[PATCH 02/15] KVM: VMX: Always signal #GP on WRMSR to MSR_IA32_CR_PAT with bad value

Sean Christopherson
2019-05-07T16:06:47Z

The behavior of WRMSR is in no way dependent on whether or not KVM
consumes the value.

Fixes: 4566654bb9be9 ("KVM: vmx: Inject #GP on invalid PAT CR")
Cc: stable@vger.kernel.org
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 60306f19105d..f3b0f4445af7 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1896,9 +1896,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
MSR_TYPE_W);
break;
case MSR_IA32_CR_PAT:
+ if (!kvm_pat_valid(data))
+ return 1;
+
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
- if (!kvm_pat_valid(data))
- return 1;
vmcs_write64(GUEST_IA32_PAT, data);
vcpu->arch.pat = data;
break;
--
2.21.0