The spec requires us to set the "addr" in guest physical address space to
multiples of the block size. In some cases, this is not the case right
now: For example, when starting a VM with 4 GiB boot memory and a
virtio-mem device with a block size of 2 GiB, "memaddr" will be
auto-assigned to 0x140000000 / 5 GiB.
We'll try to improve auto-assignment for memory devices next, to avoid
bailing out in case memory device code selects a bad address.
Note: The Linux driver doesn't support such big block sizes yet.
Reviewed-by: Pankaj Gupta <pankaj.gupta.li...@gmail.com>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Cc: Wei Yang <richardw.y...@linux.intel.com>
Cc: Dr. David Alan Gilbert <dgilb...@redhat.com>
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.li...@gmail.com>
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
hw/virtio/virtio-mem.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index 9b1461cf9d..878c0b4f21 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -532,6 +532,11 @@ static void virtio_mem_device_realize(DeviceState *dev,
Error **errp)
")", VIRTIO_MEM_REQUESTED_SIZE_PROP,
VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size);
return;
+ } else if (!QEMU_IS_ALIGNED(vmem->addr, vmem->block_size)) {
+ error_setg(errp, "'%s' property has to be multiples of '%s' (0x%"
PRIx64
+ ")", VIRTIO_MEM_ADDR_PROP, VIRTIO_MEM_BLOCK_SIZE_PROP,
+ vmem->block_size);
+ return;
} else if (!QEMU_IS_ALIGNED(memory_region_size(&vmem->memdev->mr),
vmem->block_size)) {
error_setg(errp, "'%s' property memdev size has to be multiples of"
--
2.26.2
