Date:   Thu,  2 Feb 2023 18:28:08 +0000
In-Reply-To: <20230202182809.1929122-1-bgardon@google.com>
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References: <20230202182809.1929122-1-bgardon@google.com>
Message-ID: <20230202182809.1929122-21-bgardon@google.com>
Subject: [PATCH 20/21] KVM: x86/mmu: Move Shadow MMU init/teardown to shadow_mmu.c
From:   Ben Gardon <bgardon@google.com>
To:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        David Matlack <dmatlack@google.com>,
        Vipin Sharma <vipinsh@google.com>,
        Ricardo Koller <ricarkol@google.com>,
        Ben Gardon <bgardon@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Move the meat of kvm_mmu_init_vm() and kvm_mmu_uninit_vm() pertaining to
the Shadow MMU to shadow_mmu.c.

Suggested-by: David Matlack <dmatlack@google.com>

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 arch/x86/kvm/mmu/mmu.c          | 41 +++---------------------------
 arch/x86/kvm/mmu/mmu_internal.h |  2 ++
 arch/x86/kvm/mmu/shadow_mmu.c   | 44 +++++++++++++++++++++++++++++++--
 arch/x86/kvm/mmu/shadow_mmu.h   |  6 ++---
 4 files changed, 51 insertions(+), 42 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 63b928bded9d1..10aff23dea75d 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2743,7 +2743,7 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu)
  * not use any resource of the being-deleted slot or all slots
  * after calling the function.
  */
-static void kvm_mmu_zap_all_fast(struct kvm *kvm)
+void kvm_mmu_zap_all_fast(struct kvm *kvm)
 {
 	lockdep_assert_held(&kvm->slots_lock);
 
@@ -2795,22 +2795,13 @@ static void kvm_mmu_zap_all_fast(struct kvm *kvm)
 		kvm_tdp_mmu_zap_invalidated_roots(kvm);
 }
 
-static void kvm_mmu_invalidate_zap_pages_in_memslot(struct kvm *kvm,
-			struct kvm_memory_slot *slot,
-			struct kvm_page_track_notifier_node *node)
-{
-	kvm_mmu_zap_all_fast(kvm);
-}
-
 int kvm_mmu_init_vm(struct kvm *kvm)
 {
-	struct kvm_page_track_notifier_node *node = &kvm->arch.mmu_sp_tracker;
 	int r;
 
-	INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
-	INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
 	INIT_LIST_HEAD(&kvm->arch.possible_nx_huge_pages);
-	spin_lock_init(&kvm->arch.mmu_unsync_pages_lock);
+
+	kvm_mmu_init_shadow_mmu(kvm);
 
 	if (tdp_mmu_enabled) {
 		r = kvm_mmu_init_tdp_mmu(kvm);
@@ -2818,38 +2809,14 @@ int kvm_mmu_init_vm(struct kvm *kvm)
 			return r;
 	}
 
-	node->track_write = kvm_shadow_mmu_pte_write;
-	node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot;
-	kvm_page_track_register_notifier(kvm, node);
-
-	kvm->arch.split_page_header_cache.kmem_cache = mmu_page_header_cache;
-	kvm->arch.split_page_header_cache.gfp_zero = __GFP_ZERO;
-
-	kvm->arch.split_shadow_page_cache.gfp_zero = __GFP_ZERO;
-
-	kvm->arch.split_desc_cache.kmem_cache = pte_list_desc_cache;
-	kvm->arch.split_desc_cache.gfp_zero = __GFP_ZERO;
-
 	return 0;
 }
 
-static void mmu_free_vm_memory_caches(struct kvm *kvm)
-{
-	kvm_mmu_free_memory_cache(&kvm->arch.split_desc_cache);
-	kvm_mmu_free_memory_cache(&kvm->arch.split_page_header_cache);
-	kvm_mmu_free_memory_cache(&kvm->arch.split_shadow_page_cache);
-}
-
 void kvm_mmu_uninit_vm(struct kvm *kvm)
 {
-	struct kvm_page_track_notifier_node *node = &kvm->arch.mmu_sp_tracker;
-
-	kvm_page_track_unregister_notifier(kvm, node);
-
+	kvm_mmu_uninit_shadow_mmu(kvm);
 	if (tdp_mmu_enabled)
 		kvm_mmu_uninit_tdp_mmu(kvm);
-
-	mmu_free_vm_memory_caches(kvm);
 }
 
 /*
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 2273c6263faf0..c49d302b037ec 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -406,4 +406,6 @@ BUILD_MMU_ROLE_ACCESSOR(ext,  cr4, pke);
 BUILD_MMU_ROLE_ACCESSOR(ext,  cr4, la57);
 BUILD_MMU_ROLE_ACCESSOR(base, efer, nx);
 BUILD_MMU_ROLE_ACCESSOR(ext,  efer, lma);
+
+void kvm_mmu_zap_all_fast(struct kvm *kvm);
 #endif /* __KVM_X86_MMU_INTERNAL_H */
diff --git a/arch/x86/kvm/mmu/shadow_mmu.c b/arch/x86/kvm/mmu/shadow_mmu.c
index c6d3da795992e..6449ac4de4883 100644
--- a/arch/x86/kvm/mmu/shadow_mmu.c
+++ b/arch/x86/kvm/mmu/shadow_mmu.c
@@ -3013,8 +3013,9 @@ static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte)
 	return spte;
 }
 
-void kvm_shadow_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
-			      int bytes, struct kvm_page_track_notifier_node *node)
+static void kvm_shadow_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
+				     const u8 *new, int bytes,
+				     struct kvm_page_track_notifier_node *node)
 {
 	gfn_t gfn = gpa >> PAGE_SHIFT;
 	struct kvm_mmu_page *sp;
@@ -3623,3 +3624,42 @@ void kvm_shadow_mmu_zap_all(struct kvm *kvm)
 
 	kvm_shadow_mmu_commit_zap_page(kvm, &invalid_list);
 }
+
+static void kvm_shadow_mmu_invalidate_zap_pages_in_memslot(struct kvm *kvm,
+			struct kvm_memory_slot *slot,
+			struct kvm_page_track_notifier_node *node)
+{
+	kvm_mmu_zap_all_fast(kvm);
+}
+
+void kvm_mmu_init_shadow_mmu(struct kvm *kvm)
+{
+	struct kvm_page_track_notifier_node *node = &kvm->arch.mmu_sp_tracker;
+
+	INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
+	INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
+	spin_lock_init(&kvm->arch.mmu_unsync_pages_lock);
+
+	node->track_write = kvm_shadow_mmu_pte_write;
+	node->track_flush_slot = kvm_shadow_mmu_invalidate_zap_pages_in_memslot;
+	kvm_page_track_register_notifier(kvm, node);
+
+	kvm->arch.split_page_header_cache.kmem_cache = mmu_page_header_cache;
+	kvm->arch.split_page_header_cache.gfp_zero = __GFP_ZERO;
+
+	kvm->arch.split_shadow_page_cache.gfp_zero = __GFP_ZERO;
+
+	kvm->arch.split_desc_cache.kmem_cache = pte_list_desc_cache;
+	kvm->arch.split_desc_cache.gfp_zero = __GFP_ZERO;
+}
+
+void kvm_mmu_uninit_shadow_mmu(struct kvm *kvm)
+{
+	struct kvm_page_track_notifier_node *node = &kvm->arch.mmu_sp_tracker;
+
+	kvm_page_track_unregister_notifier(kvm, node);
+
+	kvm_mmu_free_memory_cache(&kvm->arch.split_desc_cache);
+	kvm_mmu_free_memory_cache(&kvm->arch.split_page_header_cache);
+	kvm_mmu_free_memory_cache(&kvm->arch.split_shadow_page_cache);
+}
diff --git a/arch/x86/kvm/mmu/shadow_mmu.h b/arch/x86/kvm/mmu/shadow_mmu.h
index ab01636373bda..f2e54355ebb19 100644
--- a/arch/x86/kvm/mmu/shadow_mmu.h
+++ b/arch/x86/kvm/mmu/shadow_mmu.h
@@ -65,9 +65,6 @@ int kvm_shadow_mmu_alloc_special_roots(struct kvm_vcpu *vcpu);
 int kvm_shadow_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes,
 			    int *root_level);
 
-void kvm_shadow_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
-			      int bytes, struct kvm_page_track_notifier_node *node);
-
 void kvm_shadow_mmu_zap_obsolete_pages(struct kvm *kvm);
 bool kvm_shadow_mmu_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end);
 
@@ -103,6 +100,9 @@ bool kvm_shadow_mmu_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
 
 void kvm_shadow_mmu_zap_all(struct kvm *kvm);
 
+void kvm_mmu_init_shadow_mmu(struct kvm *kvm);
+void kvm_mmu_uninit_shadow_mmu(struct kvm *kvm);
+
 /* Exports from paging_tmpl.h */
 gpa_t paging32_gva_to_gpa(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 			  gpa_t vaddr, u64 access,
-- 
2.39.1.519.gcb327c4b5f-goog