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KVM: Convert kvm->requests_lock to raw_spinlock_t

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The code relies on kvm->requests_lock inhibiting preemption.

Noted by Jan Kiszka.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-02-18 11:25:22 +02:00 committed by Marcelo Tosatti
parent fa8273e954
commit 70e335e168
2 changed files with 4 additions and 4 deletions
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2
include/linux/kvm_host.h
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@ -161,7 +161,7 @@ struct kvm_memslots {
struct kvm {
spinlock_t mmu_lock;
spinlock_t requests_lock;
raw_spinlock_t requests_lock;
struct mutex slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
struct kvm_memslots *memslots;

6
virt/kvm/kvm_main.c
View File

@ -138,7 +138,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
zalloc_cpumask_var(&cpus, GFP_ATOMIC);
spin_lock(&kvm->requests_lock);
raw_spin_lock(&kvm->requests_lock);
me = smp_processor_id();
kvm_for_each_vcpu(i, vcpu, kvm) {
if (test_and_set_bit(req, &vcpu->requests))
@ -153,7 +153,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
smp_call_function_many(cpus, ack_flush, NULL, 1);
else
called = false;
spin_unlock(&kvm->requests_lock);
raw_spin_unlock(&kvm->requests_lock);
free_cpumask_var(cpus);
return called;
}
@ -409,7 +409,7 @@ static struct kvm *kvm_create_vm(void)
kvm->mm = current->mm;
atomic_inc(&kvm->mm->mm_count);
spin_lock_init(&kvm->mmu_lock);
spin_lock_init(&kvm->requests_lock);
raw_spin_lock_init(&kvm->requests_lock);
kvm_eventfd_init(kvm);
mutex_init(&kvm->lock);
mutex_init(&kvm->irq_lock);