Merge tag 'kvm-x86-generic-6.13' of https://github.com/kvm-x86/linux into HEAD

KVM generic changes for 6.13

 - Rework kvm_vcpu_on_spin() to use a single for-loop instead of making two
   partial poasses over "all" vCPUs.  Opportunistically expand the comment
   to better explain the motivation and logic.

 - Protect vcpu->pid accesses outside of vcpu->mutex with a rwlock instead
   of RCU, so that running a vCPU on a different task doesn't encounter
   long stalls due to having to wait for all CPUs become quiescent.

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 02f0206fd2dc..18a1672ffcbf 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -334,7 +334,8 @@ struct kvm_vcpu {
 #ifndef __KVM_HAVE_ARCH_WQP
 	struct rcuwait wait;
 #endif
-	struct pid __rcu *pid;
+	struct pid *pid;
+	rwlock_t pid_lock;
 	int sigset_active;
 	sigset_t sigset;
 	unsigned int halt_poll_ns;