Merge tag 'kvm-x86-fixes-6.11-rcN' of https://github.com/kvm-x86/linux into kvm-master

KVM x86 fixes for 6.11

 - Fixup missed comments from the REMOVED_SPTE=>FROZEN_SPTE rename.

 - Ensure a root is successfully loaded when pre-faulting SPTEs.

 - Grab kvm->srcu when handling KVM_SET_VCPU_EVENTS to guard against accessing
   memslots if toggling SMM happens to force a VM-Exit.

 - Emulate MSR_{FS,GS}_BASE on SVM even though interception is always disabled,
   so that KVM does the right thing if KVM's emulator encounters {RD,WR}MSR.

 - Explicitly clear BUS_LOCK_DETECT from KVM's caps on AMD, as KVM doesn't yet
   virtualize BUS_LOCK_DETECT on AMD.

 - Cleanup the help message for CONFIG_KVM_AMD_SEV, and call out that KVM now
   supports SEV-SNP too.

1 files changed, 11 insertions, 9 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 581d3e5c9117..7066fc84f351 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2417,7 +2417,7 @@ struct memory_failure_entry {
 struct memory_failure_cpu {
 	DECLARE_KFIFO(fifo, struct memory_failure_entry,
 		      MEMORY_FAILURE_FIFO_SIZE);
-	spinlock_t lock;
+	raw_spinlock_t lock;
 	struct work_struct work;
 };
 
@@ -2443,20 +2443,22 @@ void memory_failure_queue(unsigned long pfn, int flags)
 {
 	struct memory_failure_cpu *mf_cpu;
 	unsigned long proc_flags;
+	bool buffer_overflow;
 	struct memory_failure_entry entry = {
 		.pfn =		pfn,
 		.flags =	flags,
 	};
 
 	mf_cpu = &get_cpu_var(memory_failure_cpu);
-	spin_lock_irqsave(&mf_cpu->lock, proc_flags);
-	if (kfifo_put(&mf_cpu->fifo, entry))
+	raw_spin_lock_irqsave(&mf_cpu->lock, proc_flags);
+	buffer_overflow = !kfifo_put(&mf_cpu->fifo, entry);
+	if (!buffer_overflow)
 		schedule_work_on(smp_processor_id(), &mf_cpu->work);
-	else
+	raw_spin_unlock_irqrestore(&mf_cpu->lock, proc_flags);
+	put_cpu_var(memory_failure_cpu);
+	if (buffer_overflow)
 		pr_err("buffer overflow when queuing memory failure at %#lx\n",
 		       pfn);
-	spin_unlock_irqrestore(&mf_cpu->lock, proc_flags);
-	put_cpu_var(memory_failure_cpu);
 }
 EXPORT_SYMBOL_GPL(memory_failure_queue);
 
@@ -2469,9 +2471,9 @@ static void memory_failure_work_func(struct work_struct *work)
 
 	mf_cpu = container_of(work, struct memory_failure_cpu, work);
 	for (;;) {
-		spin_lock_irqsave(&mf_cpu->lock, proc_flags);
+		raw_spin_lock_irqsave(&mf_cpu->lock, proc_flags);
 		gotten = kfifo_get(&mf_cpu->fifo, &entry);
-		spin_unlock_irqrestore(&mf_cpu->lock, proc_flags);
+		raw_spin_unlock_irqrestore(&mf_cpu->lock, proc_flags);
 		if (!gotten)
 			break;
 		if (entry.flags & MF_SOFT_OFFLINE)
@@ -2501,7 +2503,7 @@ static int __init memory_failure_init(void)
 
 	for_each_possible_cpu(cpu) {
 		mf_cpu = &per_cpu(memory_failure_cpu, cpu);
-		spin_lock_init(&mf_cpu->lock);
+		raw_spin_lock_init(&mf_cpu->lock);
 		INIT_KFIFO(mf_cpu->fifo);
 		INIT_WORK(&mf_cpu->work, memory_failure_work_func);
 	}