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vmm: Support using an existing FD for memory

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If this FD (wrapped in a File) is supplied when the RAM region is being
created use that over creating a new one.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-01-12 10:12:05 +00:00
parent 271e17bd79
commit eeba1d3ad8
1 changed files with 10 additions and 2 deletions
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12
vmm/src/memory_manager.rs
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@ -480,6 +480,7 @@ impl MemoryManager {
zone.hugepages,
zone.hugepage_size,
zone.host_numa_node,
None,
)?;
// Add region to the list of regions associated with the
@ -555,6 +556,7 @@ impl MemoryManager {
zone_config.hugepages,
zone_config.hugepage_size,
zone_config.host_numa_node,
None,
)?;
memory_regions.push(Arc::clone(&region));
if let Some(memory_zone) = memory_zones.get_mut(&guest_ram_mapping.zone_id) {
@ -939,6 +941,7 @@ impl MemoryManager {
zone.hugepages,
zone.hugepage_size,
zone.host_numa_node,
None,
)?;
guest_memory = guest_memory
@ -1227,9 +1230,13 @@ impl MemoryManager {
hugepages: bool,
hugepage_size: Option<u64>,
host_numa_node: Option<u32>,
existing_memory_file: Option<File>,
) -> Result<Arc<GuestRegionMmap>, Error> {
let (f, f_off) =
Self::open_memory_file(backing_file, file_offset, size, hugepages, hugepage_size)?;
let (f, f_off) = if let Some(f) = existing_memory_file {
(f, file_offset)
} else {
Self::open_memory_file(backing_file, file_offset, size, hugepages, hugepage_size)?
};
let mut mmap_flags = libc::MAP_NORESERVE
| if shared {
@ -1343,6 +1350,7 @@ impl MemoryManager {
self.hugepages,
self.hugepage_size,
None,
None,
)?;
// Map it into the guest