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[PULL v2 03/38] virtio-mem: Make sure "usable_region_size" is always mul

From: Michael S. Tsirkin
Subject: [PULL v2 03/38] virtio-mem: Make sure "usable_region_size" is always multiples of the block size
Date: Tue, 3 Nov 2020 23:50:49 -0500

From: David Hildenbrand <david@redhat.com>

The spec states:
  "The device MUST set addr, region_size, usable_region_size, plugged_size,
   requested_size to multiples of block_size."

With block sizes > 256MB, we currently wouldn't guarantee that for the

Note that we cannot exceed the region_size, as we already enforce the
alignment there properly.

Fixes: 910b25766b33 ("virtio-mem: Paravirtualized memory hot(un)plug")
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20201008083029.9504-3-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
 hw/virtio/virtio-mem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index 70200b4eac..461ac68ee8 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -227,6 +227,9 @@ static void virtio_mem_resize_usable_region(VirtIOMEM *vmem,
     uint64_t newsize = MIN(memory_region_size(&vmem->memdev->mr),
                            requested_size + VIRTIO_MEM_USABLE_EXTENT);
+    /* The usable region size always has to be multiples of the block size. */
+    newsize = QEMU_ALIGN_UP(newsize, vmem->block_size);
     if (!requested_size) {
         newsize = 0;

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