[PATCH 1/2] kvm: nVMX: Enforce must-be-zero bits in the IA32_VMX_VMCS_ENUM MSR

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According to the SDM, bit 0 and bits 63:10 of the IA32_VMX_VMCS_ENUM
MSR are reserved and are read as 0.

Signed-off-by: Aaron Lewis <aaronlewis@xxxxxxxxxx>
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
---
 arch/x86/kvm/vmx/nested.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 6401eb7ef19c..3438279e76bb 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1219,6 +1219,8 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 	case MSR_IA32_VMX_EPT_VPID_CAP:
 		return vmx_restore_vmx_ept_vpid_cap(vmx, data);
 	case MSR_IA32_VMX_VMCS_ENUM:
+		if (data & (GENMASK_ULL(63, 10) | BIT_ULL(0)))
+			return -EINVAL;
 		vmx->nested.msrs.vmcs_enum = data;
 		return 0;
 	default:
-- 
2.22.0.rc1.311.g5d7573a151-goog




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