KVM: remove in_range from io devices
This changes bus accesses to use high-level kvm_io_bus_read/kvm_io_bus_write
functions. in_range now becomes unused so it is removed from device ops in
favor of read/write callbacks performing range checks internally.
This allows aliasing (mostly for in-kernel virtio), as well as better error
handling by making it possible to pass errors up to userspace.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 7b7cc9f..0352f81 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -19,18 +19,14 @@
return container_of(dev, struct kvm_coalesced_mmio_dev, dev);
}
-static int coalesced_mmio_in_range(struct kvm_io_device *this,
- gpa_t addr, int len, int is_write)
+static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev,
+ gpa_t addr, int len)
{
- struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
struct kvm_coalesced_mmio_zone *zone;
struct kvm_coalesced_mmio_ring *ring;
unsigned avail;
int i;
- if (!is_write)
- return 0;
-
/* Are we able to batch it ? */
/* last is the first free entry
@@ -60,11 +56,13 @@
return 0;
}
-static void coalesced_mmio_write(struct kvm_io_device *this,
- gpa_t addr, int len, const void *val)
+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);
@@ -76,6 +74,7 @@
smp_wmb();
ring->last = (ring->last + 1) % KVM_COALESCED_MMIO_MAX;
spin_unlock(&dev->lock);
+ return 0;
}
static void coalesced_mmio_destructor(struct kvm_io_device *this)
@@ -87,7 +86,6 @@
static const struct kvm_io_device_ops coalesced_mmio_ops = {
.write = coalesced_mmio_write,
- .in_range = coalesced_mmio_in_range,
.destructor = coalesced_mmio_destructor,
};