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KVM: x86: Allow HWCR.McStatusWrEn to be cleared once set

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When HWCR is set to 0, store 0 in vcpu->arch.msr_hwcr.

Fixes: 191c8137a9 ("x86/kvm: Implement HWCR support")
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20230929230246.1954854-2-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Jim Mattson 2023-09-29 16:02:44 -07:00 committed by Sean Christopherson
parent 5d6d6a7d7e
commit 598a790fc2
1 changed files with 2 additions and 3 deletions
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5
arch/x86/kvm/x86.c
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@ -3791,12 +3791,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
data &= ~(u64)0x8; /* ignore TLB cache disable */
/* Handle McStatusWrEn */
if (data == BIT_ULL(18)) {
vcpu->arch.msr_hwcr = data;
} else if (data != 0) {
if (data & ~BIT_ULL(18)) {
kvm_pr_unimpl_wrmsr(vcpu, msr, data);
return 1;
}
vcpu->arch.msr_hwcr = data;
break;
case MSR_FAM10H_MMIO_CONF_BASE:
if (data != 0) {