linux-kernel - [PATCH 14/16] KVM: x86/tdp_mmu: Take root types for kvm_tdp_mmu_invalidate_all

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Date: Tue, 14 May 2024 17:59:50 -0700
From: Rick Edgecombe <rick.p.edgecombe@...el.com>
To: pbonzini@...hat.com,
	seanjc@...gle.com,
	kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	isaku.yamahata@...il.com,
	erdemaktas@...gle.com,
	sagis@...gle.com,
	yan.y.zhao@...el.com,
	dmatlack@...gle.com,
	rick.p.edgecombe@...el.com
Subject: [PATCH 14/16] KVM: x86/tdp_mmu: Take root types for kvm_tdp_mmu_invalidate_all_roots()

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

Rename kvm_tdp_mmu_invalidate_all_roots() to
kvm_tdp_mmu_invalidate_roots(), and make it enum kvm_tdp_mmu_root_types
as an argument.

Have the callers only invalidate the required roots instead of all
roots.

Suggested-by: Chao Gao <chao.gao@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
TDX MMU Part 1:
 - New patch
---
 arch/x86/kvm/mmu/mmu.c     | 9 +++++++--
 arch/x86/kvm/mmu/tdp_mmu.c | 5 +++--
 arch/x86/kvm/mmu/tdp_mmu.h | 3 ++-
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 2506d6277818..338628094ad7 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6414,8 +6414,13 @@ static void kvm_mmu_zap_all_fast(struct kvm *kvm)
 	 * write and in the same critical section as making the reload request,
 	 * e.g. before kvm_zap_obsolete_pages() could drop mmu_lock and yield.
 	 */
-	if (tdp_mmu_enabled)
-		kvm_tdp_mmu_invalidate_all_roots(kvm);
+	if (tdp_mmu_enabled) {
+		/*
+		 * The private page tables doesn't support fast zapping.  The
+		 * caller should handle it by other way.
+		 */
+		kvm_tdp_mmu_invalidate_roots(kvm, KVM_SHARED_ROOTS);
+	}
 
 	/*
 	 * Notify all vcpus to reload its shadow page table and flush TLB.
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 8914c5b0d5ab..eb88af48c8f0 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -37,7 +37,7 @@ void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm)
 	 * for zapping and thus puts the TDP MMU's reference to each root, i.e.
 	 * ultimately frees all roots.
 	 */
-	kvm_tdp_mmu_invalidate_all_roots(kvm);
+	kvm_tdp_mmu_invalidate_roots(kvm, KVM_ANY_ROOTS);
 	kvm_tdp_mmu_zap_invalidated_roots(kvm);
 
 	WARN_ON(atomic64_read(&kvm->arch.tdp_mmu_pages));
@@ -1170,7 +1170,8 @@ void kvm_tdp_mmu_zap_invalidated_roots(struct kvm *kvm)
  * Note, kvm_tdp_mmu_zap_invalidated_roots() is gifted the TDP MMU's reference.
  * See kvm_tdp_mmu_alloc_root().
  */
-void kvm_tdp_mmu_invalidate_all_roots(struct kvm *kvm)
+void kvm_tdp_mmu_invalidate_roots(struct kvm *kvm,
+				  enum kvm_tdp_mmu_root_types types)
 {
 	struct kvm_mmu_page *root;
 
diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h
index 6a65498b481c..b8a967426fac 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.h
+++ b/arch/x86/kvm/mmu/tdp_mmu.h
@@ -35,7 +35,8 @@ static_assert(KVM_PRIVATE_ROOTS == (KVM_SHARED_ROOTS << 1));
 bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, gfn_t start, gfn_t end, bool flush);
 bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp);
 void kvm_tdp_mmu_zap_all(struct kvm *kvm);
-void kvm_tdp_mmu_invalidate_all_roots(struct kvm *kvm);
+void kvm_tdp_mmu_invalidate_roots(struct kvm *kvm,
+				  enum kvm_tdp_mmu_root_types types);
 void kvm_tdp_mmu_zap_invalidated_roots(struct kvm *kvm);
 
 int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
-- 
2.34.1