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-rw-r--r--Documentation/virtual/kvm/locking.txt6
-rw-r--r--virt/kvm/kvm_main.c19
2 files changed, 15 insertions, 10 deletions
diff --git a/Documentation/virtual/kvm/locking.txt b/Documentation/virtual/kvm/locking.txt
index a9f366e73c8e..ba9e1c2150c2 100644
--- a/Documentation/virtual/kvm/locking.txt
+++ b/Documentation/virtual/kvm/locking.txt
@@ -135,7 +135,11 @@ Name: kvm_lock
Type: raw_spinlock
Arch: any
Protects: - vm_list
- - hardware virtualization enable/disable
+
+Name: kvm_count_lock
+Type: raw_spinlock_t
+Arch: any
+Protects: - hardware virtualization enable/disable
Comment: 'raw' because hardware enabling/disabling must be atomic /wrt
migration.
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 426051d66173..eb94343c2ed2 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -71,6 +71,7 @@ MODULE_LICENSE("GPL");
*/
DEFINE_RAW_SPINLOCK(kvm_lock);
+static DEFINE_RAW_SPINLOCK(kvm_count_lock);
LIST_HEAD(vm_list);
static cpumask_var_t cpus_hardware_enabled;
@@ -2683,10 +2684,10 @@ static void hardware_enable_nolock(void *junk)
static void hardware_enable(void)
{
- raw_spin_lock(&kvm_lock);
+ raw_spin_lock(&kvm_count_lock);
if (kvm_usage_count)
hardware_enable_nolock(NULL);
- raw_spin_unlock(&kvm_lock);
+ raw_spin_unlock(&kvm_count_lock);
}
static void hardware_disable_nolock(void *junk)
@@ -2701,10 +2702,10 @@ static void hardware_disable_nolock(void *junk)
static void hardware_disable(void)
{
- raw_spin_lock(&kvm_lock);
+ raw_spin_lock(&kvm_count_lock);
if (kvm_usage_count)
hardware_disable_nolock(NULL);
- raw_spin_unlock(&kvm_lock);
+ raw_spin_unlock(&kvm_count_lock);
}
static void hardware_disable_all_nolock(void)
@@ -2718,16 +2719,16 @@ static void hardware_disable_all_nolock(void)
static void hardware_disable_all(void)
{
- raw_spin_lock(&kvm_lock);
+ raw_spin_lock(&kvm_count_lock);
hardware_disable_all_nolock();
- raw_spin_unlock(&kvm_lock);
+ raw_spin_unlock(&kvm_count_lock);
}
static int hardware_enable_all(void)
{
int r = 0;
- raw_spin_lock(&kvm_lock);
+ raw_spin_lock(&kvm_count_lock);
kvm_usage_count++;
if (kvm_usage_count == 1) {
@@ -2740,7 +2741,7 @@ static int hardware_enable_all(void)
}
}
- raw_spin_unlock(&kvm_lock);
+ raw_spin_unlock(&kvm_count_lock);
return r;
}
@@ -3130,7 +3131,7 @@ static int kvm_suspend(void)
static void kvm_resume(void)
{
if (kvm_usage_count) {
- WARN_ON(raw_spin_is_locked(&kvm_lock));
+ WARN_ON(raw_spin_is_locked(&kvm_count_lock));
hardware_enable_nolock(NULL);
}
}