KVM: switch coalesced mmio changes to slots_lock

switch coalesced mmio slots_lock.  slots_lock is already taken for read
everywhere, so we only need to take it for write when changing zones.
This is in preparation to removing in_range and kvm->lock around it.

[avi: fix build]

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 397f41936698..b40946c1237d 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -115,16 +115,16 @@ int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
         if (dev == NULL)
                 return -EINVAL;
 
-        mutex_lock(&kvm->lock);
+        down_write(&kvm->slots_lock);
         if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) {
-                mutex_unlock(&kvm->lock);
+                up_write(&kvm->slots_lock);
                 return -ENOBUFS;
         }
 
         dev->zone[dev->nb_zones] = *zone;
         dev->nb_zones++;
 
-        mutex_unlock(&kvm->lock);
+        up_write(&kvm->slots_lock);
         return 0;
 }
 
@@ -138,7 +138,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
         if (dev == NULL)
                 return -EINVAL;
 
-        mutex_lock(&kvm->lock);
+        down_write(&kvm->slots_lock);
 
         i = dev->nb_zones;
         while(i) {
@@ -156,7 +156,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
                 i--;
         }
 
-        mutex_unlock(&kvm->lock);
+        up_write(&kvm->slots_lock);
 
         return 0;
 }