KVM: Convert intx_mask_lock to spin lock

As kvm_notify_acked_irq calls kvm_assigned_dev_ack_irq under
rcu_read_lock, we cannot use a mutex in the latter function. Switch to a
spin lock to address this.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ec171c1d0878..40bb1c661a6e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -556,7 +556,7 @@ struct kvm_assigned_dev_kernel {
         struct pci_dev *dev;
         struct kvm *kvm;
         spinlock_t intx_lock;
-        struct mutex intx_mask_lock;
+        spinlock_t intx_mask_lock;
         char irq_name[32];
         struct pci_saved_state *pci_saved_state;
 };