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.

Link: https://lore.kernel.org/r/20240831001538.336683-21-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com>

arch/x86/include/asm/kvm_host.h

@@ -2132,7 +2132,6 @@ 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);
 

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);