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vmm: create memfd for private mappings

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User-defined zones may be mapped private. Create a memfd for private
zones so that fallocate operations are available on all regions, not
just shared ones. This prepares for zone management via hole punching.

The MAP_ANONYMOUS flag is now omitted since the memory becomes
tmpfs-backed via memfd.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
This commit is contained in:
JP Kobryn
2026-05-06 08:39:53 -07:00
committed by Rob Bradford
parent 534aaaceb2
commit ced3762a67
1 changed files with 2 additions and 2 deletions
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4
vmm/src/memory_manager.rs
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@@ -1932,8 +1932,8 @@ impl MemoryManager {
mmap_flags |= libc::MAP_SHARED;
Some(Self::create_anonymous_file(size, hugepages, hugepage_size)?)
} else {
mmap_flags |= libc::MAP_PRIVATE | libc::MAP_ANONYMOUS;
None
mmap_flags |= libc::MAP_PRIVATE;
Some(Self::create_anonymous_file(size, hugepages, hugepage_size)?)
};
let region = MmapRegion::build(fo, size, libc::PROT_READ | libc::PROT_WRITE, mmap_flags)