From 0aed28006114b17d64a8491071d382f4c8a83e41 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Thu, 8 Oct 2020 10:30:25 +0200 Subject: [PATCH] virtio-mem: Make sure "usable_region_size" is always multiples of the block size 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 usable_region_size. 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" Cc: Wei Yang Cc: Dr. David Alan Gilbert Cc: Igor Mammedov Cc: Pankaj Gupta Signed-off-by: David Hildenbrand Message-Id: <20201008083029.9504-3-david@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- 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; }