Commit 598a790f authored by Jim Mattson's avatar Jim Mattson Committed by Sean Christopherson
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KVM: x86: Allow HWCR.McStatusWrEn to be cleared once set 



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

Fixes: 191c8137 ("x86/kvm: Implement HWCR support")
Signed-off-by: default avatarJim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20230929230246.1954854-2-jmattson@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 5d6d6a7d

arch/x86/kvm/x86.c

+2 −3
Original line number Diff line number Diff line
@@ -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) {