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vmm: virtio-mem: Enforce alignment and size requirements

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The virtio-mem driver is generating some warnings regarding both size
and alignment of the virtio-mem region if not based on 128MiB:

The alignment of the physical start address can make some memory
unusable.
The alignment of the physical end address can make some memory
unusable.

For these reasons, the current patch enforces virtio-mem regions to be
128MiB aligned and checks the size provided by the user is a multiple of
128MiB.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-09-14 11:36:31 +02:00
parent eb7b923e22
commit 1798ed8194
2 changed files with 9 additions and 9 deletions
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vmm/src/memory_manager.rs
+3 -5
View File
@@ -523,11 +523,9 @@ impl MemoryManager {
} else {
// Alignment must be "natural" i.e. same as size of block
let start_addr = GuestAddress(
(start_of_device_area.0
+ virtio_devices::VIRTIO_MEM_DEFAULT_BLOCK_SIZE
- 1)
/ virtio_devices::VIRTIO_MEM_DEFAULT_BLOCK_SIZE
* virtio_devices::VIRTIO_MEM_DEFAULT_BLOCK_SIZE,
(start_of_device_area.0 + virtio_devices::VIRTIO_MEM_ALIGN_SIZE - 1)
/ virtio_devices::VIRTIO_MEM_ALIGN_SIZE
* virtio_devices::VIRTIO_MEM_ALIGN_SIZE,
);
let region = MemoryManager::create_ram_region(