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KVM: Convert kvm_lock to raw_spinlock

Code under this lock requires non-preemptibility. Ensure this also over
-rt by converting it to raw spinlock.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
master
Jan Kiszka 11 years ago
committed by Marcelo Tosatti
parent
commit
e935b8372c
  1. 2
      arch/x86/include/asm/kvm_host.h
  2. 4
      arch/x86/kvm/mmu.c
  3. 4
      arch/x86/kvm/x86.c
  4. 36
      virt/kvm/kvm_main.c

2
arch/x86/include/asm/kvm_host.h

@ -85,7 +85,7 @@
#define ASYNC_PF_PER_VCPU 64
extern spinlock_t kvm_lock;
extern raw_spinlock_t kvm_lock;
extern struct list_head vm_list;
struct kvm_vcpu;

4
arch/x86/kvm/mmu.c

@ -3587,7 +3587,7 @@ static int mmu_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
if (nr_to_scan == 0)
goto out;
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
int idx, freed_pages;
@ -3610,7 +3610,7 @@ static int mmu_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
if (kvm_freed)
list_move_tail(&kvm_freed->vm_list, &vm_list);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
out:
return percpu_counter_read_positive(&kvm_total_used_mmu_pages);

4
arch/x86/kvm/x86.c

@ -4557,7 +4557,7 @@ static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long va
smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->cpu != freq->cpu)
@ -4567,7 +4567,7 @@ static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long va
send_ipi = 1;
}
}
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
if (freq->old < freq->new && send_ipi) {
/*

36
virt/kvm/kvm_main.c

@ -69,7 +69,7 @@ MODULE_LICENSE("GPL");
* kvm->lock --> kvm->slots_lock --> kvm->irq_lock
*/
DEFINE_SPINLOCK(kvm_lock);
DEFINE_RAW_SPINLOCK(kvm_lock);
LIST_HEAD(vm_list);
static cpumask_var_t cpus_hardware_enabled;
@ -481,9 +481,9 @@ static struct kvm *kvm_create_vm(void)
mutex_init(&kvm->irq_lock);
mutex_init(&kvm->slots_lock);
atomic_set(&kvm->users_count, 1);
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
return kvm;
@ -556,9 +556,9 @@ static void kvm_destroy_vm(struct kvm *kvm)
struct mm_struct *mm = kvm->mm;
kvm_arch_sync_events(kvm);
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
kvm_free_irq_routing(kvm);
for (i = 0; i < KVM_NR_BUSES; i++)
kvm_io_bus_destroy(kvm->buses[i]);
@ -2177,9 +2177,9 @@ static void hardware_enable_nolock(void *junk)
static void hardware_enable(void *junk)
{
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
hardware_enable_nolock(junk);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
}
static void hardware_disable_nolock(void *junk)
@ -2194,9 +2194,9 @@ static void hardware_disable_nolock(void *junk)
static void hardware_disable(void *junk)
{
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
hardware_disable_nolock(junk);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
}
static void hardware_disable_all_nolock(void)
@ -2210,16 +2210,16 @@ static void hardware_disable_all_nolock(void)
static void hardware_disable_all(void)
{
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
hardware_disable_all_nolock();
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
}
static int hardware_enable_all(void)
{
int r = 0;
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
kvm_usage_count++;
if (kvm_usage_count == 1) {
@ -2232,7 +2232,7 @@ static int hardware_enable_all(void)
}
}
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
return r;
}
@ -2394,10 +2394,10 @@ static int vm_stat_get(void *_offset, u64 *val)
struct kvm *kvm;
*val = 0;
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
*val += *(u32 *)((void *)kvm + offset);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
return 0;
}
@ -2411,12 +2411,12 @@ static int vcpu_stat_get(void *_offset, u64 *val)
int i;
*val = 0;
spin_lock(&kvm_lock);
raw_spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
kvm_for_each_vcpu(i, vcpu, kvm)
*val += *(u32 *)((void *)vcpu + offset);
spin_unlock(&kvm_lock);
raw_spin_unlock(&kvm_lock);
return 0;
}
@ -2457,7 +2457,7 @@ static int kvm_suspend(struct sys_device *dev, pm_message_t state)
static int kvm_resume(struct sys_device *dev)
{
if (kvm_usage_count) {
WARN_ON(spin_is_locked(&kvm_lock));
WARN_ON(raw_spin_is_locked(&kvm_lock));
hardware_enable_nolock(NULL);
}
return 0;

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