diff options
Diffstat (limited to 'arch/x86/kvm/mmu/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 0fb033ce6cc5..559b4b92b5e2 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4846,13 +4846,22 @@ static union kvm_mmu_role kvm_calc_mmu_role_common(struct kvm_vcpu *vcpu, return role; } +static inline int kvm_mmu_get_tdp_level(struct kvm_vcpu *vcpu) +{ + /* Use 5-level TDP if and only if it's useful/necessary. */ + if (vcpu->arch.max_tdp_level == 5 && cpuid_maxphyaddr(vcpu) <= 48) + return 4; + + return vcpu->arch.max_tdp_level; +} + static union kvm_mmu_role kvm_calc_tdp_mmu_root_page_role(struct kvm_vcpu *vcpu, bool base_only) { union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, base_only); role.base.ad_disabled = (shadow_accessed_mask == 0); - role.base.level = vcpu->arch.tdp_level; + role.base.level = kvm_mmu_get_tdp_level(vcpu); role.base.direct = true; role.base.gpte_is_8_bytes = true; @@ -4873,7 +4882,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) context->sync_page = nonpaging_sync_page; context->invlpg = NULL; context->update_pte = nonpaging_update_pte; - context->shadow_root_level = vcpu->arch.tdp_level; + context->shadow_root_level = kvm_mmu_get_tdp_level(vcpu); context->direct_map = true; context->get_guest_pgd = get_cr3; context->get_pdptr = kvm_pdptr_read; @@ -4973,7 +4982,7 @@ kvm_calc_shadow_npt_root_page_role(struct kvm_vcpu *vcpu) kvm_calc_shadow_root_page_role_common(vcpu, false); role.base.direct = false; - role.base.level = vcpu->arch.tdp_level; + role.base.level = kvm_mmu_get_tdp_level(vcpu); return role; } @@ -5683,7 +5692,7 @@ static int alloc_mmu_pages(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) * SVM's 32-bit NPT support, TDP paging doesn't use PAE paging and can * skip allocating the PDP table. */ - if (tdp_enabled && vcpu->arch.tdp_level > PT32E_ROOT_LEVEL) + if (tdp_enabled && kvm_mmu_get_tdp_level(vcpu) > PT32E_ROOT_LEVEL) return 0; page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_DMA32); |