Re: [PATCH v8 3/6] KVM: x86: Virtualize CR3.LAM_{U48,U57}

[Binbin Wu]

On 5/10/2023 4:58 PM, Chao Gao wrote:
> > @@ -7743,6 +7744,9 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
> > 		vmx->msr_ia32_feature_control_valid_bits &=
> > 			~FEAT_CTL_SGX_LC_ENABLED;
> >
> > +	if (guest_cpuid_has(vcpu, X86_FEATURE_LAM))
> > +		vcpu->arch.cr3_ctrl_bits |= X86_CR3_LAM_U48 | X86_CR3_LAM_U57;
> This function can be called multiple times. We need to clear LAM bits if LAM
> isn't exposed to the guest, i.e.,
>
> 	else
> 		vcpu->arch.cr3_ctrl_bits &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
Nice catch, will fix it, thanks.


> With this fixed,
>
> Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>