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From:   isaku.yamahata@intel.com
To:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     isaku.yamahata@intel.com, isaku.yamahata@gmail.com,
        Paolo Bonzini <pbonzini@redhat.com>, erdemaktas@google.com,
        Sean Christopherson <seanjc@google.com>,
        Sagi Shahar <sagis@google.com>,
        David Matlack <dmatlack@google.com>
Subject: [PATCH v11 045/113] KVM: x86/mmu: Make make_spte() aware of shared GPA for MTRR
Date:   Thu, 12 Jan 2023 08:31:53 -0800
Message-Id: <5d9a6b899ea9a25a1192efd0ef5e43ecb1a0f250.1673539699.git.isaku.yamahata@intel.com>
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From: Isaku Yamahata <isaku.yamahata@intel.com>

For TDX MTRR support of shared GPA, get_mt_mask() method needs to know if
the given gfn is shared or private.  Make make_spte() aware of shared GPA
and rename gfn of make_spte() to gfn_including_shared to make it explicit.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
 arch/x86/kvm/mmu/spte.c | 5 +++--
 arch/x86/kvm/mmu/spte.h | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index a23e9205fc42..7171df3e262a 100644
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -136,13 +136,14 @@ bool spte_has_volatile_bits(u64 spte)
 
 bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 	       const struct kvm_memory_slot *slot,
-	       unsigned int pte_access, gfn_t gfn, kvm_pfn_t pfn,
+	       unsigned int pte_access, gfn_t gfn_including_shared, kvm_pfn_t pfn,
 	       u64 old_spte, bool prefetch, bool can_unsync,
 	       bool host_writable, u64 *new_spte)
 {
 	int level = sp->role.level;
 	u64 spte = SPTE_MMU_PRESENT_MASK;
 	bool wrprot = false;
+	gfn_t gfn = gfn_including_shared & ~kvm_gfn_shared_mask(vcpu->kvm);
 
 	WARN_ON_ONCE(!pte_access && !shadow_present_mask);
 
@@ -190,7 +191,7 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 		spte |= PT_PAGE_SIZE_MASK;
 
 	if (shadow_memtype_mask)
-		spte |= static_call(kvm_x86_get_mt_mask)(vcpu, gfn,
+		spte |= static_call(kvm_x86_get_mt_mask)(vcpu, gfn_including_shared,
 							 kvm_is_mmio_pfn(pfn));
 	if (host_writable)
 		spte |= shadow_host_writable_mask;
diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h
index 7046671b08cb..067ea1ae3a13 100644
--- a/arch/x86/kvm/mmu/spte.h
+++ b/arch/x86/kvm/mmu/spte.h
@@ -481,7 +481,7 @@ bool spte_has_volatile_bits(u64 spte);
 
 bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 	       const struct kvm_memory_slot *slot,
-	       unsigned int pte_access, gfn_t gfn, kvm_pfn_t pfn,
+	       unsigned int pte_access, gfn_t gfn_including_shared, kvm_pfn_t pfn,
 	       u64 old_spte, bool prefetch, bool can_unsync,
 	       bool host_writable, u64 *new_spte);
 u64 make_huge_page_split_spte(struct kvm *kvm, u64 huge_spte,
-- 
2.25.1