Messages in this thread Patch in this message | | | From | isaku.yamahata@intel ... | Subject | [RFC PATCH v5 038/104] KVM: x86/mmu: Allow per-VM override of the TDP max page level | Date | Fri, 4 Mar 2022 11:48:54 -0800 |
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From: Sean Christopherson <sean.j.christopherson@intel.com>
In the existing x86 KVM MMU code, there is already max_level member in struct kvm_page_fault with KVM_MAX_HUGEPAGE_LEVEL initial value. The KVM page fault handler denies page size larger than max_level.
Add per-VM member to indicate the allowed maximum page size with KVM_MAX_HUGEPAGE_LEVEL as default value and initialize max_level in struct kvm_page_fault with it.
For the guest TD, the set per-VM value for allows maximum page size to 4K page size. Then only allowed page size is 4K. It means large page is disabled.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/mmu.h | 2 +- arch/x86/kvm/mmu/mmu.c | 2 ++ 3 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index d8b78d6abc10..d33d79f2af2d 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1053,6 +1053,7 @@ struct kvm_arch { unsigned long n_requested_mmu_pages; unsigned long n_max_mmu_pages; unsigned int indirect_shadow_pages; + int tdp_max_page_level; u8 mmu_valid_gen; struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES]; struct list_head active_mmu_pages; diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 0ae91b8b25df..650989c37f2e 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -192,7 +192,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, .is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault), .nx_huge_page_workaround_enabled = is_nx_huge_page_enabled(), - .max_level = KVM_MAX_HUGEPAGE_LEVEL, + .max_level = vcpu->kvm->arch.tdp_max_page_level, .req_level = PG_LEVEL_4K, .goal_level = PG_LEVEL_4K, }; diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index a474f2e76d78..e9212394a530 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -5782,6 +5782,8 @@ void kvm_mmu_init_vm(struct kvm *kvm) node->track_write = kvm_mmu_pte_write; node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot; kvm_page_track_register_notifier(kvm, node); + + kvm->arch.tdp_max_page_level = KVM_MAX_HUGEPAGE_LEVEL; } void kvm_mmu_uninit_vm(struct kvm *kvm) -- 2.25.1
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