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    SubjectRe: [PATCH v8 035/103] KVM: x86/mmu: Allow per-VM override of the TDP max page level
    On Sun, Aug 07, 2022 at 03:01:20PM -0700, isaku.yamahata@intel.com wrote:
    > 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>

    Reviewed-by: Yuan Yao <yuan.yao@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 3c4051d4512b..e07294fc2219 100644
    > --- a/arch/x86/include/asm/kvm_host.h
    > +++ b/arch/x86/include/asm/kvm_host.h
    > @@ -1142,6 +1142,7 @@ 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 1f7f61e04b94..0e5a6dcc4966 100644
    > --- a/arch/x86/kvm/mmu/mmu.c
    > +++ b/arch/x86/kvm/mmu/mmu.c
    > @@ -6063,6 +6063,7 @@ 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 582def531d4d..e1b2e84c16b5 100644
    > --- a/arch/x86/kvm/mmu/mmu_internal.h
    > +++ b/arch/x86/kvm/mmu/mmu_internal.h
    > @@ -272,7 +272,7 @@ 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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