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| author | Marcelo Tosatti | 2009-06-04 20:08:24 +0200 |
|---|---|---|
| committer | Avi Kivity | 2009-09-10 07:32:49 +0200 |
| commit | fa40a8214bb9bcae8d49c234c19d8b4a6c1f37ff (patch) | |
| tree | 6449f27072f128a1c39faaaeef1787f754345aaf /arch/x86/kvm/i8254.c | |
| parent | KVM: introduce irq_lock, use it to protect ioapic (diff) | |
| download | kernel-qcow2-linux-fa40a8214bb9bcae8d49c234c19d8b4a6c1f37ff.tar.gz kernel-qcow2-linux-fa40a8214bb9bcae8d49c234c19d8b4a6c1f37ff.tar.xz kernel-qcow2-linux-fa40a8214bb9bcae8d49c234c19d8b4a6c1f37ff.zip | |
KVM: switch irq injection/acking data structures to irq_lock
Protect irq injection/acking data structures with a separate irq_lock
mutex. This fixes the following deadlock:
CPU A CPU B
kvm_vm_ioctl_deassign_dev_irq()
mutex_lock(&kvm->lock); worker_thread()
-> kvm_deassign_irq() -> kvm_assigned_dev_interrupt_work_handler()
-> deassign_host_irq() mutex_lock(&kvm->lock);
-> cancel_work_sync() [blocked]
[gleb: fix ia64 path]
Reported-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/i8254.c')
| -rw-r--r-- | arch/x86/kvm/i8254.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 977af7ab8193..3837db65d33e 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -654,10 +654,10 @@ static void __inject_pit_timer_intr(struct kvm *kvm) struct kvm_vcpu *vcpu; int i; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->irq_lock); kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1); kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0); - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->irq_lock); /* * Provides NMI watchdog support via Virtual Wire mode. |