Merge branch 'kvm-ghcb-for-7.2' into HEAD

Merge the final part of the GHCB 7.2 fixes at
https://lore.kernel.org/kvm/20260529183549.1104619-1-pbonzini@redhat.com/.

Patches 1-17 have already been included in Linux 7.1; these are minor
cleanups, and fixes for behaviors that are suboptimal or contradicting
the specification.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 25 insertions, 14 deletions

diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 02a68be3002a..99e3789492a0 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -1630,18 +1630,23 @@ void sock_map_unhash(struct sock *sk)
 	void (*saved_unhash)(struct sock *sk);
 	struct sk_psock *psock;
 
+retry:
 	rcu_read_lock();
 	psock = sk_psock(sk);
 	if (unlikely(!psock)) {
 		rcu_read_unlock();
 		saved_unhash = READ_ONCE(sk->sk_prot)->unhash;
+		if (unlikely(saved_unhash == sock_map_unhash))
+			goto retry;
 	} else {
 		saved_unhash = psock->saved_unhash;
 		sock_map_remove_links(sk, psock);
 		rcu_read_unlock();
+
+		if (WARN_ON_ONCE(saved_unhash == sock_map_unhash))
+			return;
 	}
-	if (WARN_ON_ONCE(saved_unhash == sock_map_unhash))
-		return;
+
 	if (saved_unhash)
 		saved_unhash(sk);
 }
@@ -1652,20 +1657,25 @@ void sock_map_destroy(struct sock *sk)
 	void (*saved_destroy)(struct sock *sk);
 	struct sk_psock *psock;
 
+retry:
 	rcu_read_lock();
 	psock = sk_psock_get(sk);
 	if (unlikely(!psock)) {
 		rcu_read_unlock();
 		saved_destroy = READ_ONCE(sk->sk_prot)->destroy;
+		if (unlikely(saved_destroy == sock_map_destroy))
+			goto retry;
 	} else {
 		saved_destroy = psock->saved_destroy;
 		sock_map_remove_links(sk, psock);
 		rcu_read_unlock();
 		sk_psock_stop(psock);
 		sk_psock_put(sk, psock);
+
+		if (WARN_ON_ONCE(saved_destroy == sock_map_destroy))
+			return;
 	}
-	if (WARN_ON_ONCE(saved_destroy == sock_map_destroy))
-		return;
+
 	if (saved_destroy)
 		saved_destroy(sk);
 }
@@ -1676,32 +1686,33 @@ void sock_map_close(struct sock *sk, long timeout)
 	void (*saved_close)(struct sock *sk, long timeout);
 	struct sk_psock *psock;
 
+retry:
 	lock_sock(sk);
 	rcu_read_lock();
-	psock = sk_psock(sk);
+	psock = sk_psock_get(sk);
 	if (likely(psock)) {
 		saved_close = psock->saved_close;
 		sock_map_remove_links(sk, psock);
-		psock = sk_psock_get(sk);
-		if (unlikely(!psock))
-			goto no_psock;
 		rcu_read_unlock();
 		sk_psock_stop(psock);
 		release_sock(sk);
 		cancel_delayed_work_sync(&psock->work);
 		sk_psock_put(sk, psock);
+
+		/* Make sure we do not recurse. This is a bug.
+		 * Leak the socket instead of crashing on a stack overflow.
+		 */
+		if (WARN_ON_ONCE(saved_close == sock_map_close))
+			return;
 	} else {
 		saved_close = READ_ONCE(sk->sk_prot)->close;
-no_psock:
 		rcu_read_unlock();
 		release_sock(sk);
+
+		if (unlikely(saved_close == sock_map_close))
+			goto retry;
 	}
 
-	/* Make sure we do not recurse. This is a bug.
-	 * Leak the socket instead of crashing on a stack overflow.
-	 */
-	if (WARN_ON_ONCE(saved_close == sock_map_close))
-		return;
 	saved_close(sk, timeout);
 }
 EXPORT_SYMBOL_GPL(sock_map_close);