diff options
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 31 |
1 files changed, 16 insertions, 15 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cb2b78e92910..7164a9ece208 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5575,6 +5575,7 @@ __visible bool kvm_rebooting; EXPORT_SYMBOL_GPL(kvm_rebooting); static DEFINE_PER_CPU(bool, hardware_enabled); +static DEFINE_MUTEX(kvm_usage_lock); static int kvm_usage_count; static int __hardware_enable_nolock(void) @@ -5607,10 +5608,10 @@ static int kvm_online_cpu(unsigned int cpu) * be enabled. Otherwise running VMs would encounter unrecoverable * errors when scheduled to this CPU. */ - mutex_lock(&kvm_lock); + mutex_lock(&kvm_usage_lock); if (kvm_usage_count) ret = __hardware_enable_nolock(); - mutex_unlock(&kvm_lock); + mutex_unlock(&kvm_usage_lock); return ret; } @@ -5630,10 +5631,10 @@ static void hardware_disable_nolock(void *junk) static int kvm_offline_cpu(unsigned int cpu) { - mutex_lock(&kvm_lock); + mutex_lock(&kvm_usage_lock); if (kvm_usage_count) hardware_disable_nolock(NULL); - mutex_unlock(&kvm_lock); + mutex_unlock(&kvm_usage_lock); return 0; } @@ -5649,9 +5650,9 @@ static void hardware_disable_all_nolock(void) static void hardware_disable_all(void) { cpus_read_lock(); - mutex_lock(&kvm_lock); + mutex_lock(&kvm_usage_lock); hardware_disable_all_nolock(); - mutex_unlock(&kvm_lock); + mutex_unlock(&kvm_usage_lock); cpus_read_unlock(); } @@ -5682,7 +5683,7 @@ static int hardware_enable_all(void) * enable hardware multiple times. */ cpus_read_lock(); - mutex_lock(&kvm_lock); + mutex_lock(&kvm_usage_lock); r = 0; @@ -5696,7 +5697,7 @@ static int hardware_enable_all(void) } } - mutex_unlock(&kvm_lock); + mutex_unlock(&kvm_usage_lock); cpus_read_unlock(); return r; @@ -5724,13 +5725,13 @@ static int kvm_suspend(void) { /* * Secondary CPUs and CPU hotplug are disabled across the suspend/resume - * callbacks, i.e. no need to acquire kvm_lock to ensure the usage count - * is stable. Assert that kvm_lock is not held to ensure the system - * isn't suspended while KVM is enabling hardware. Hardware enabling - * can be preempted, but the task cannot be frozen until it has dropped - * all locks (userspace tasks are frozen via a fake signal). + * callbacks, i.e. no need to acquire kvm_usage_lock to ensure the usage + * count is stable. Assert that kvm_usage_lock is not held to ensure + * the system isn't suspended while KVM is enabling hardware. Hardware + * enabling can be preempted, but the task cannot be frozen until it has + * dropped all locks (userspace tasks are frozen via a fake signal). */ - lockdep_assert_not_held(&kvm_lock); + lockdep_assert_not_held(&kvm_usage_lock); lockdep_assert_irqs_disabled(); if (kvm_usage_count) @@ -5740,7 +5741,7 @@ static int kvm_suspend(void) static void kvm_resume(void) { - lockdep_assert_not_held(&kvm_lock); + lockdep_assert_not_held(&kvm_usage_lock); lockdep_assert_irqs_disabled(); if (kvm_usage_count) |