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[PATCH v1 2/5] virtio-mem: Check that "memaddr" is multiples of the bloc
From: |
David Hildenbrand |
Subject: |
[PATCH v1 2/5] virtio-mem: Check that "memaddr" is multiples of the block size |
Date: |
Wed, 23 Sep 2020 13:38:57 +0200 |
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.
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>
---
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 58098686ee..716eddd792 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -515,6 +515,11 @@ 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
[PATCH v1 2/5] virtio-mem: Check that "memaddr" is multiples of the block size,
David Hildenbrand <=
[PATCH v1 3/5] memory-device: Support big alignment requirements, David Hildenbrand, 2020/09/23
[PATCH v1 4/5] memory-device: Add get_min_alignment() callback, David Hildenbrand, 2020/09/23
[PATCH v1 5/5] virito-mem: Implement get_min_alignment(), David Hildenbrand, 2020/09/23
Re: [PATCH v1 0/5] virtio-mem: block size and address-assignment optimizations, David Hildenbrand, 2020/09/25