diff options
| -rw-r--r-- | virt/kvm/coalesced_mmio.c | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index fc8487564d1f..ae075dc0890d 100644 --- a/virt/kvm/coalesced_mmio.c +++ b/virt/kvm/coalesced_mmio.c @@ -25,23 +25,8 @@ static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev, gpa_t addr, int len) { struct kvm_coalesced_mmio_zone *zone; - struct kvm_coalesced_mmio_ring *ring; - unsigned avail; int i; - /* Are we able to batch it ? */ - - /* last is the first free entry - * check if we don't meet the first used entry - * there is always one unused entry in the buffer - */ - ring = dev->kvm->coalesced_mmio_ring; - avail = (ring->first - ring->last - 1) % KVM_COALESCED_MMIO_MAX; - if (avail < KVM_MAX_VCPUS) { - /* full */ - return 0; - } - /* is it in a batchable area ? */ for (i = 0; i < dev->nb_zones; i++) { @@ -58,16 +43,43 @@ static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev, return 0; } +static int coalesced_mmio_has_room(struct kvm_coalesced_mmio_dev *dev) +{ + struct kvm_coalesced_mmio_ring *ring; + unsigned avail; + + /* Are we able to batch it ? */ + + /* last is the first free entry + * check if we don't meet the first used entry + * there is always one unused entry in the buffer + */ + ring = dev->kvm->coalesced_mmio_ring; + avail = (ring->first - ring->last - 1) % KVM_COALESCED_MMIO_MAX; + if (avail == 0) { + /* full */ + return 0; + } + + return 1; +} + static int coalesced_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, const void *val) { struct kvm_coalesced_mmio_dev *dev = to_mmio(this); struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring; + if (!coalesced_mmio_in_range(dev, addr, len)) return -EOPNOTSUPP; spin_lock(&dev->lock); + if (!coalesced_mmio_has_room(dev)) { + spin_unlock(&dev->lock); + return -EOPNOTSUPP; + } + /* copy data in first free entry of the ring */ ring->coalesced_mmio[ring->last].phys_addr = addr; |