Re: [PATCH] KVM: x86/mmu: Do not create SPTEs for GFNs that exceed host.MAXPHYADDR

[Paolo Bonzini]

On 5/2/22 13:12, Kai Huang wrote:
> > -		if (unlikely(!enable_mmio_caching)) {
> > +		if (unlikely(!enable_mmio_caching) ||
> > +		    unlikely(fault->gfn > kvm_mmu_max_gfn_host())) {
> Shouldn't we check fault->gfn against cpuid_maxphyaddr(vcpu) instead of
> kvm_mmu_max_gfn_host() here?

No, the point of this check is to handle the case where 
kvm_mmu_max_gfn_host() is smaller than cpuid_maxphyaddr().

Paolo