Re: [PATCH v4 01/14] KVM: Allow architectures to disallow pre-fault

[Fuad Tabba]

Hi Lorenzo,

On Wed, 23 Sep 2026 16:15:44 +0100, "Lorenzo Stoakes (ARM)"
<ljs@xxxxxxxxxx> wrote:
[...]
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
[...]
> +int kvm_arch_pre_fault_allowed(struct kvm_vcpu *vcpu)
> +{
> +        if (!vcpu->kvm->arch.pre_fault_allowed)
> +                return -EOPNOTSUPP;
> +
> +        return 0;
> +}

nit: the comment above the smp_rmb() in tdx_sept_map_leaf_spte() still
says pre_fault_allowed is read by kvm_arch_vcpu_pre_fault_memory(),
but after this patch it's read here.

Reviewed-by: Fuad Tabba <fuad.tabba@xxxxxxxxx>

Cheers,
/fuad