KVM: x86/mmu: Use shadow page role to detect PML-unfriendly pages for L2

Rework make_spte() to query the shadow page's role, specifically whether
or not it's a guest_mode page, a.k.a. a page for L2, when determining if
the SPTE is compatible with PML.  This eliminates a dependency on @vcpu,
with a future goal of being able to create SPTEs without a specific vCPU.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 52c6527..5897ce4 100644 (file)
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -104,7 +104,7 @@ static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
        return kvm_mmu_role_as_id(sp->role);
 }
 
-static inline bool kvm_vcpu_ad_need_write_protect(struct kvm_vcpu *vcpu)
+static inline bool kvm_mmu_page_ad_need_write_protect(struct kvm_mmu_page *sp)
 {
        /*
         * When using the EPT page-modification log, the GPAs in the CPU dirty
@@ -112,10 +112,9 @@ static inline bool kvm_vcpu_ad_need_write_protect(struct kvm_vcpu *vcpu)
         * on write protection to record dirty pages, which bypasses PML, since
         * writes now result in a vmexit.  Note, the check on CPU dirty logging
         * being enabled is mandatory as the bits used to denote WP-only SPTEs
-        * are reserved for NPT w/ PAE (32-bit KVM).
+        * are reserved for PAE paging (32-bit KVM).
         */
-       return vcpu->arch.mmu == &vcpu->arch.guest_mmu &&
-              kvm_x86_ops.cpu_dirty_log_size;
+       return kvm_x86_ops.cpu_dirty_log_size && sp->role.guest_mode;
 }
 
 int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,

diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index 0c76c45..84e64db 100644 (file)
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -101,7 +101,7 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 
        if (sp->role.ad_disabled)
                spte |= SPTE_TDP_AD_DISABLED_MASK;
-       else if (kvm_vcpu_ad_need_write_protect(vcpu))
+       else if (kvm_mmu_page_ad_need_write_protect(sp))
                spte |= SPTE_TDP_AD_WRPROT_ONLY_MASK;
 
        /*