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authorJunaid Shahid <junaids@google.com>2019-01-03 17:14:28 -0800
committerPaolo Bonzini <pbonzini@redhat.com>2019-06-05 14:14:50 +0200
commit0d9ce162cf46c99628cc5da9510b959c7976735b (patch)
treecb7670bedf8c614aa20313b95456f942fd16b6d4 /virt
parent1ae4de23eddef465104277e79fa669bec7b3d288 (diff)
downloadlwn-0d9ce162cf46c99628cc5da9510b959c7976735b.tar.gz
lwn-0d9ce162cf46c99628cc5da9510b959c7976735b.zip
kvm: Convert kvm_lock to a mutex
It doesn't seem as if there is any particular need for kvm_lock to be a spinlock, so convert the lock to a mutex so that sleepable functions (in particular cond_resched()) can be called while holding it. Signed-off-by: Junaid Shahid <junaids@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c30
1 files changed, 15 insertions, 15 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b2579841263f..9613987ef4c8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -98,7 +98,7 @@ EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
* kvm->lock --> kvm->slots_lock --> kvm->irq_lock
*/
-DEFINE_SPINLOCK(kvm_lock);
+DEFINE_MUTEX(kvm_lock);
static DEFINE_RAW_SPINLOCK(kvm_count_lock);
LIST_HEAD(vm_list);
@@ -683,9 +683,9 @@ static struct kvm *kvm_create_vm(unsigned long type)
if (r)
goto out_err;
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
preempt_notifier_inc();
@@ -731,9 +731,9 @@ static void kvm_destroy_vm(struct kvm *kvm)
kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
kvm_destroy_vm_debugfs(kvm);
kvm_arch_sync_events(kvm);
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
list_del(&kvm->vm_list);
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
kvm_free_irq_routing(kvm);
for (i = 0; i < KVM_NR_BUSES; i++) {
struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
@@ -4034,13 +4034,13 @@ static int vm_stat_get(void *_offset, u64 *val)
u64 tmp_val;
*val = 0;
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
stat_tmp.kvm = kvm;
vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
*val += tmp_val;
}
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
return 0;
}
@@ -4053,12 +4053,12 @@ static int vm_stat_clear(void *_offset, u64 val)
if (val)
return -EINVAL;
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
stat_tmp.kvm = kvm;
vm_stat_clear_per_vm((void *)&stat_tmp, 0);
}
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
return 0;
}
@@ -4073,13 +4073,13 @@ static int vcpu_stat_get(void *_offset, u64 *val)
u64 tmp_val;
*val = 0;
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
stat_tmp.kvm = kvm;
vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
*val += tmp_val;
}
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
return 0;
}
@@ -4092,12 +4092,12 @@ static int vcpu_stat_clear(void *_offset, u64 val)
if (val)
return -EINVAL;
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
stat_tmp.kvm = kvm;
vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
}
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
return 0;
}
@@ -4118,7 +4118,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
if (!kvm_dev.this_device || !kvm)
return;
- spin_lock(&kvm_lock);
+ mutex_lock(&kvm_lock);
if (type == KVM_EVENT_CREATE_VM) {
kvm_createvm_count++;
kvm_active_vms++;
@@ -4127,7 +4127,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
}
created = kvm_createvm_count;
active = kvm_active_vms;
- spin_unlock(&kvm_lock);
+ mutex_unlock(&kvm_lock);
env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT);
if (!env)