KVM: x86/tdp_mmu: Remove unused "kvm" of kvm_tdp_mmu_get_root()

The "struct kvm *kvm" parameter of kvm_tdp_mmu_get_root() is not used,
so remove it. No functional change intended.
Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
Message-Id: <20220125095909.38122-5-cloudliang@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/tdp_mmu.c

@@ -126,7 +126,7 @@ static struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm,
 
 	while (next_root) {
 		if ((!only_valid || !next_root->role.invalid) &&
-		    kvm_tdp_mmu_get_root(kvm, next_root))
+		    kvm_tdp_mmu_get_root(next_root))
 			break;
 
 		next_root = list_next_or_null_rcu(&kvm->arch.tdp_mmu_roots,
@@ -220,7 +220,7 @@ hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu)
 	 */
 	for_each_tdp_mmu_root(kvm, root, kvm_mmu_role_as_id(role)) {
 		if (root->role.word == role.word &&
-		    kvm_tdp_mmu_get_root(kvm, root))
+		    kvm_tdp_mmu_get_root(root))
 			goto out;
 	}
 

arch/x86/kvm/mmu/tdp_mmu.h

@@ -7,8 +7,7 @@
 
 hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
 
-__must_check static inline bool 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_mmu_page *root)
 {
 	return refcount_inc_not_zero(&root->tdp_mmu_root_count);
 }