[PATCH 07/13] KVM: x86/mmu: Make TDP MMU root refcount atomic

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>,
	Peter Shier <pshier@google.com>,
	Peter Feiner <pfeiner@google.com>,
	Junaid Shahid <junaids@google.com>,
	Jim Mattson <jmattson@google.com>,
	Yulei Zhang <yulei.kernel@gmail.com>,
	Wanpeng Li <kernellwp@gmail.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
	Ben Gardon <bgardon@google.com>
Subject: [PATCH 07/13] KVM: x86/mmu: Make TDP MMU root refcount atomic
Date: Wed, 31 Mar 2021 14:08:35 -0700	[thread overview]
Message-ID: <20210331210841.3996155-8-bgardon@google.com> (raw)
In-Reply-To: <20210331210841.3996155-1-bgardon@google.com>

In order to parallelize more operations for the TDP MMU, make the
refcount on TDP MMU roots atomic, so that a future patch can allow
multiple threads to take a reference on the root concurrently, while
holding the MMU lock in read mode.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 arch/x86/kvm/mmu/mmu_internal.h |  6 +++++-
 arch/x86/kvm/mmu/tdp_mmu.c      | 15 ++++++++-------
 arch/x86/kvm/mmu/tdp_mmu.h      |  9 +++------
 3 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 788dcf77c957..0a040d6a4f35 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -50,7 +50,11 @@ struct kvm_mmu_page {
 	u64 *spt;
 	/* hold the gfn of each spte inside spt */
 	gfn_t *gfns;
-	int root_count;          /* Currently serving as active root */
+	/* Currently serving as active root */
+	union {
+		int root_count;
+		refcount_t tdp_mmu_root_count;
+	};
 	unsigned int unsync_children;
 	struct kvm_rmap_head parent_ptes; /* rmap pointers to parent sptes */
 	DECLARE_BITMAP(unsync_child_bitmap, 512);
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index ab1d26b40164..1f0b2d6124a2 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -56,7 +56,7 @@ void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root)
 
 	lockdep_assert_held_write(&kvm->mmu_lock);
 
-	if (--root->root_count)
+	if (!refcount_dec_and_test(&root->tdp_mmu_root_count))
 		return;
 
 	WARN_ON(!root->tdp_mmu_page);
@@ -88,10 +88,12 @@ static struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm,
 		next_root = list_first_entry(&kvm->arch.tdp_mmu_roots,
 					     typeof(*next_root), link);
 
+	while (!list_entry_is_head(next_root, &kvm->arch.tdp_mmu_roots, link) &&
+	       !kvm_tdp_mmu_get_root(kvm, next_root))
+		next_root = list_next_entry(next_root, link);
+
 	if (list_entry_is_head(next_root, &kvm->arch.tdp_mmu_roots, link))
 		next_root = NULL;
-	else
-		kvm_tdp_mmu_get_root(kvm, next_root);
 
 	if (prev_root)
 		kvm_tdp_mmu_put_root(kvm, prev_root);
@@ -158,14 +160,13 @@ hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu)
 
 	/* Check for an existing root before allocating a new one. */
 	for_each_tdp_mmu_root(kvm, root) {
-		if (root->role.word == role.word) {
-			kvm_tdp_mmu_get_root(kvm, root);
+		if (root->role.word == role.word &&
+		    kvm_tdp_mmu_get_root(kvm, root))
 			goto out;
-		}
 	}
 
 	root = alloc_tdp_mmu_page(vcpu, 0, vcpu->arch.mmu->shadow_root_level);
-	root->root_count = 1;
+	refcount_set(&root->tdp_mmu_root_count, 1);
 
 	list_add(&root->link, &kvm->arch.tdp_mmu_roots);
 
diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h
index 5d950e987fc7..9961df505067 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.h
+++ b/arch/x86/kvm/mmu/tdp_mmu.h
@@ -7,13 +7,10 @@
 
 hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
 
-static inline void kvm_tdp_mmu_get_root(struct kvm *kvm,
-					struct kvm_mmu_page *root)
+__must_check static inline bool kvm_tdp_mmu_get_root(struct kvm *kvm,
+						     struct kvm_mmu_page *root)
 {
-	BUG_ON(!root->root_count);
-	lockdep_assert_held(&kvm->mmu_lock);
-
-	++root->root_count;
+	return refcount_inc_not_zero(&root->tdp_mmu_root_count);
 }
 
 void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root);
-- 
2.31.0.291.g576ba9dcdaf-goog

