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    Subject[PATCH v11 035/113] KVM: x86/mmu: Allow per-VM override of the TDP max page level
    Date
    From: Sean Christopherson <sean.j.christopherson@intel.com>

    TDX requires special handling to support large private page. For
    simplicity, only support 4K page for TD guest for now. Add per-VM maximum
    page level support to support different maximum page sizes for TD guest and
    conventional VMX guest.

    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/mmu.c | 1 +
    arch/x86/kvm/mmu/mmu_internal.h | 2 +-
    3 files changed, 3 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index 807da4b95aba..f5b51bdef0c6 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -1217,6 +1217,7 @@ 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/mmu.c b/arch/x86/kvm/mmu/mmu.c
    index 5b111a325434..801ef6c41847 100644
    --- a/arch/x86/kvm/mmu/mmu.c
    +++ b/arch/x86/kvm/mmu/mmu.c
    @@ -6141,6 +6141,7 @@ int kvm_mmu_init_vm(struct kvm *kvm)
    kvm->arch.split_desc_cache.kmem_cache = pte_list_desc_cache;
    kvm->arch.split_desc_cache.gfp_zero = __GFP_ZERO;

    + kvm->arch.tdp_max_page_level = KVM_MAX_HUGEPAGE_LEVEL;
    return 0;
    }

    diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
    index 5ccf08183b00..6767bc9b7c5c 100644
    --- a/arch/x86/kvm/mmu/mmu_internal.h
    +++ b/arch/x86/kvm/mmu/mmu_internal.h
    @@ -276,7 +276,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
    .nx_huge_page_workaround_enabled =
    is_nx_huge_page_enabled(vcpu->kvm),

    - .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,
    };
    --
    2.25.1
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