diff options
Diffstat (limited to 'virt/kvm/coalesced_mmio.c')
| -rw-r--r-- | virt/kvm/coalesced_mmio.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index 754906800999..397f41936698 100644 --- a/virt/kvm/coalesced_mmio.c +++ b/virt/kvm/coalesced_mmio.c @@ -31,10 +31,6 @@ static int coalesced_mmio_in_range(struct kvm_io_device *this, if (!is_write) return 0; - /* kvm->lock is taken by the caller and must be not released before - * dev.read/write - */ - /* Are we able to batch it ? */ /* last is the first free entry @@ -43,7 +39,7 @@ static int coalesced_mmio_in_range(struct kvm_io_device *this, */ ring = dev->kvm->coalesced_mmio_ring; avail = (ring->first - ring->last - 1) % KVM_COALESCED_MMIO_MAX; - if (avail < 1) { + if (avail < KVM_MAX_VCPUS) { /* full */ return 0; } @@ -70,7 +66,7 @@ static void coalesced_mmio_write(struct kvm_io_device *this, struct kvm_coalesced_mmio_dev *dev = to_mmio(this); struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring; - /* kvm->lock must be taken by caller before call to in_range()*/ + spin_lock(&dev->lock); /* copy data in first free entry of the ring */ @@ -79,6 +75,7 @@ static void coalesced_mmio_write(struct kvm_io_device *this, memcpy(ring->coalesced_mmio[ring->last].data, val, len); smp_wmb(); ring->last = (ring->last + 1) % KVM_COALESCED_MMIO_MAX; + spin_unlock(&dev->lock); } static void coalesced_mmio_destructor(struct kvm_io_device *this) @@ -101,6 +98,7 @@ int kvm_coalesced_mmio_init(struct kvm *kvm) dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL); if (!dev) return -ENOMEM; + spin_lock_init(&dev->lock); kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops); dev->kvm = kvm; kvm->coalesced_mmio_dev = dev; |