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| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-07-23 09:08:21 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-07-25 13:29:34 +0200 |
| commit | 5e58cfe41c7e5902c32bb7f62993d43fb4c48ccf (patch) | |
| tree | 5836d843b325dcea7ba9243f4c9ccb4664ecd255 /drivers/kvm | |
| parent | KVM: Correctly handle writes crossing a page boundary (diff) | |
| download | linux-5e58cfe41c7e5902c32bb7f62993d43fb4c48ccf.tar.xz linux-5e58cfe41c7e5902c32bb7f62993d43fb4c48ccf.zip | |
KVM: Fix unlikely kvm_create vs decache_vcpus_on_cpu race
We add the kvm to the vm_list before initializing the vcpu mutexes,
which can be mutex_trylock()'ed by decache_vcpus_on_cpu().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index a0a3fddba815..46efbe70801c 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -297,9 +297,6 @@ static struct kvm *kvm_create_vm(void) kvm_io_bus_init(&kvm->pio_bus); spin_lock_init(&kvm->lock); INIT_LIST_HEAD(&kvm->active_mmu_pages); - spin_lock(&kvm_lock); - list_add(&kvm->vm_list, &vm_list); - spin_unlock(&kvm_lock); kvm_io_bus_init(&kvm->mmio_bus); for (i = 0; i < KVM_MAX_VCPUS; ++i) { struct kvm_vcpu *vcpu = &kvm->vcpus[i]; @@ -309,6 +306,9 @@ static struct kvm *kvm_create_vm(void) vcpu->kvm = kvm; vcpu->mmu.root_hpa = INVALID_PAGE; } + spin_lock(&kvm_lock); + list_add(&kvm->vm_list, &vm_list); + spin_unlock(&kvm_lock); return kvm; } |