KVM: x86: Simplify msr_filter update

Replace srcu_dereference()+rcu_assign_pointer() sequence with
a single rcu_replace_pointer().

Suggested-by: Sean Christopherson <[email protected]>
Signed-off-by: Michal Luczaj <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

1 files changed, 1 insertions, 4 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4f8e78d49585..9c66cb3657b4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6492,11 +6492,8 @@ static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm,
 	}
 
 	mutex_lock(&kvm->lock);
-
 	/* The per-VM filter is protected by kvm->lock... */
-	old_filter = srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1);
-
-	rcu_assign_pointer(kvm->arch.msr_filter, new_filter);
+	old_filter = rcu_replace_pointer(kvm->arch.msr_filter, new_filter, 1);
 	mutex_unlock(&kvm->lock);
 	synchronize_srcu(&kvm->srcu);