linux-kernel - [PATCH v9 043/105] KVM: x86/mmu: Add a new is_private member for union kvm_mmu_page

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Message-Id: <d99c47094aafee1fadb863cf5695ec09302feda7.1664530907.git.isaku.yamahata@intel.com>
Date:   Fri, 30 Sep 2022 03:17:37 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>
Subject: [PATCH v9 043/105] KVM: x86/mmu: Add a new is_private member for union kvm_mmu_page_role

From: Isaku Yamahata <isaku.yamahata@...el.com>

Because TDX support introduces private mapping, add a new member in union
kvm_mmu_page_role with access functions to check the member.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/include/asm/kvm_host.h | 27 +++++++++++++++++++++++++++
 arch/x86/kvm/mmu/mmu_internal.h | 11 +++++++++++
 2 files changed, 38 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 122e1baef012..5f18a6c16715 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -336,7 +336,12 @@ union kvm_mmu_page_role {
 		unsigned ad_disabled:1;
 		unsigned guest_mode:1;
 		unsigned passthrough:1;
+#ifdef CONFIG_KVM_MMU_PRIVATE
+		unsigned is_private:1;
+		unsigned :4;
+#else
 		unsigned :5;
+#endif
 
 		/*
 		 * This is left at the top of the word so that
@@ -348,6 +353,28 @@ union kvm_mmu_page_role {
 	};
 };
 
+#ifdef CONFIG_KVM_MMU_PRIVATE
+static inline bool kvm_mmu_page_role_is_private(union kvm_mmu_page_role role)
+{
+	return !!role.is_private;
+}
+
+static inline void kvm_mmu_page_role_set_private(union kvm_mmu_page_role *role)
+{
+	role->is_private = 1;
+}
+#else
+static inline bool kvm_mmu_page_role_is_private(union kvm_mmu_page_role role)
+{
+	return false;
+}
+
+static inline void kvm_mmu_page_role_set_private(union kvm_mmu_page_role *role)
+{
+	WARN_ON_ONCE(1);
+}
+#endif
+
 /*
  * kvm_mmu_extended_role complements kvm_mmu_page_role, tracking properties
  * relevant to the current MMU configuration.   When loading CR0, CR4, or EFER,
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 486d719ca2e1..222ee61a415a 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -142,6 +142,17 @@ static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
 	return kvm_mmu_role_as_id(sp->role);
 }
 
+static inline bool is_private_sp(const struct kvm_mmu_page *sp)
+{
+	return kvm_mmu_page_role_is_private(sp->role);
+}
+
+static inline bool is_private_sptep(u64 *sptep)
+{
+	WARN_ON_ONCE(!sptep);
+	return is_private_sp(sptep_to_sp(sptep));
+}
+
 bool kvm_mem_attr_is_mixed(struct kvm_memory_slot *slot, gfn_t gfn, int level);
 
 static inline bool kvm_mmu_page_ad_need_write_protect(struct kvm_mmu_page *sp)
-- 
2.25.1