Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 33 insertions, 0 deletions

diff --git a/hw/display/edid-region.c b/hw/display/edid-region.c
new file mode 100644
index 000000000..675429dc1
--- /dev/null
+++ b/hw/display/edid-region.c
@@ -0,0 +1,33 @@
+#include "qemu/osdep.h"
+#include "exec/memory.h"
+#include "hw/display/edid.h"
+
+static uint64_t edid_region_read(void *ptr, hwaddr addr, unsigned size)
+{
+    uint8_t *edid = ptr;
+
+    return edid[addr];
+}
+
+static void edid_region_write(void *ptr, hwaddr addr,
+                             uint64_t val, unsigned size)
+{
+    /* read only */
+}
+
+static const MemoryRegionOps edid_region_ops = {
+    .read = edid_region_read,
+    .write = edid_region_write,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 4,
+    .impl.min_access_size = 1,
+    .impl.max_access_size = 1,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+void qemu_edid_region_io(MemoryRegion *region, Object *owner,
+                         uint8_t *edid, size_t size)
+{
+    memory_region_init_io(region, owner, &edid_region_ops,
+                          edid, "edid", size);
+}