Re: [RFC PATCH V3 2/4] KVM: X86: Introduce role.glevel for level expanded pagetable

[Lai Jiangshan <jiangshanlai@gmail.com>]

On Wed, Mar 30, 2022 at 9:21 PM Lai Jiangshan <jiangshanlai@gmail.com> wrote:

> @@ -1713,7 +1721,7 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, gfn_t gfn,
>
>         sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache);
>         sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache);
> -       if (!role.direct)
> +       if (role.glevel == role.level)
>                 sp->gfns = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache);
>         set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
>
> @@ -2054,6 +2062,8 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
>                 quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
>                 role.quadrant = quadrant;
>         }
> +       if (level < role.glevel)
> +               role.glevel = level;

missing:

if (direct)
   role.glevel = 0;

>
>         sp_list = &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)];
>         for_each_valid_sp(vcpu->kvm, sp, sp_list) {