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vmm: memory_manager: don't set backing_file for virtio_mem regions

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The memory region that is associated with the hotpluggable part of
a virtio-mem zone isn't backed by the file specified in the
MemoryZoneConfig. The file is used only for the fixed part of the
zone. When you try to restore a snapshot with virtio-mem, the
backing file is used for all its regions. This results in the
following error:

  VmRestore(MemoryManager(GuestMemoryRegion(MappingPastEof)))

This patch sets backing_file only for the fixed part of a virtio-mem
zone.

Fixes: #6337

Signed-off-by: Alexandru Matei <alexandru.matei@uipath.com>
This commit is contained in:
Alexandru Matei 2024-03-28 14:58:10 +02:00 committed by Bo Chen
parent 28d4957ba5
commit fbe3e4d642
1 changed files with 5 additions and 1 deletions
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6
vmm/src/memory_manager.rs
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@ -671,7 +671,11 @@ impl MemoryManager {
for zone_config in zones_config {
if guest_ram_mapping.zone_id == zone_config.id {
let region = MemoryManager::create_ram_region(
&zone_config.file,
if guest_ram_mapping.virtio_mem {
&None
} else {
&zone_config.file
},
guest_ram_mapping.file_offset,
GuestAddress(guest_ram_mapping.gpa),
guest_ram_mapping.size as usize,