linux-kernel - [PATCH v2 20/22] KVM: x86/mmu: Subsume kvm_mmu_unprotect_page() into the and

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Message-ID: <20240831001538.336683-21-seanjc@google.com>
Date: Fri, 30 Aug 2024 17:15:35 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Yuan Yao <yuan.yao@...el.com>, Yuan Yao <yuan.yao@...ux.intel.com>
Subject: [PATCH v2 20/22] KVM: x86/mmu: Subsume kvm_mmu_unprotect_page() into
 the and_retry() version

Fold kvm_mmu_unprotect_page() into kvm_mmu_unprotect_gfn_and_retry() now
that all other direct usage is gone.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/include/asm/kvm_host.h |  1 -
 arch/x86/kvm/mmu/mmu.c          | 33 +++++++++++++--------------------
 2 files changed, 13 insertions(+), 21 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4aa10db97f6f..0fbde3ca8d1a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2134,7 +2134,6 @@ int kvm_get_nr_pending_nmis(struct kvm_vcpu *vcpu);
 
 void kvm_update_dr7(struct kvm_vcpu *vcpu);
 
-int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn);
 bool __kvm_mmu_unprotect_gfn_and_retry(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 				       bool always_retry);
 
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index aabed77f35d4..d042874b0a3b 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2695,27 +2695,12 @@ void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned long goal_nr_mmu_pages)
 	write_unlock(&kvm->mmu_lock);
 }
 
-int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
-{
-	struct kvm_mmu_page *sp;
-	LIST_HEAD(invalid_list);
-	int r;
-
-	r = 0;
-	write_lock(&kvm->mmu_lock);
-	for_each_gfn_valid_sp_with_gptes(kvm, sp, gfn) {
-		r = 1;
-		kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
-	}
-	kvm_mmu_commit_zap_page(kvm, &invalid_list);
-	write_unlock(&kvm->mmu_lock);
-
-	return r;
-}
-
 bool __kvm_mmu_unprotect_gfn_and_retry(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 				       bool always_retry)
 {
+	struct kvm *kvm = vcpu->kvm;
+	LIST_HEAD(invalid_list);
+	struct kvm_mmu_page *sp;
 	gpa_t gpa = cr2_or_gpa;
 	bool r = false;
 
@@ -2727,7 +2712,7 @@ bool __kvm_mmu_unprotect_gfn_and_retry(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 	 * positive is benign, and a false negative will simply result in KVM
 	 * skipping the unprotect+retry path, which is also an optimization.
 	 */
-	if (!READ_ONCE(vcpu->kvm->arch.indirect_shadow_pages))
+	if (!READ_ONCE(kvm->arch.indirect_shadow_pages))
 		goto out;
 
 	if (!vcpu->arch.mmu->root_role.direct) {
@@ -2736,7 +2721,15 @@ bool __kvm_mmu_unprotect_gfn_and_retry(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 			goto out;
 	}
 
-	r = kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
+	r = false;
+	write_lock(&kvm->mmu_lock);
+	for_each_gfn_valid_sp_with_gptes(kvm, sp, gpa_to_gfn(gpa)) {
+		r = true;
+		kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
+	}
+	kvm_mmu_commit_zap_page(kvm, &invalid_list);
+	write_unlock(&kvm->mmu_lock);
+
 out:
 	if (r || always_retry) {
 		vcpu->arch.last_retry_eip = kvm_rip_read(vcpu);
-- 
2.46.0.469.g59c65b2a67-goog