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vmm: Remove directory support from MemoryZoneConfig::file

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Fixes: #5082

Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@intel.com>
This commit is contained in:
Ravi kumar Veeramally 2023-03-31 15:27:19 +03:00 committed by Bo Chen
parent 55937f63bc
commit a8d1849485
1 changed files with 6 additions and 31 deletions
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37
vmm/src/memory_manager.rs
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@ -327,6 +327,9 @@ pub enum Error {
#[cfg(target_arch = "aarch64")]
/// Failed to create UEFI flash
CreateUefiFlash(HypervisorVmError),
/// Using a directory as a backing file for memory is not supported
DirectoryAsBackingFileForMemory,
}
const ENABLE_FLAG: usize = 0;
@ -1271,37 +1274,9 @@ impl MemoryManager {
Ok(FileOffset::new(f, 0))
}
fn open_backing_file(
backing_file: &PathBuf,
file_offset: u64,
size: usize,
) -> Result<FileOffset, Error> {
fn open_backing_file(backing_file: &PathBuf, file_offset: u64) -> Result<FileOffset, Error> {
if backing_file.is_dir() {
warn!(
"Using a directory as a backing file for memory is deprecated \
and will be removed in a future release. (See #5082)"
);
// Override file offset as it does not apply in this case.
info!(
"Ignoring file offset since the backing file is a \
temporary file created from the specified directory."
);
let fs_str = format!("{}{}", backing_file.display(), "/tmpfile_XXXXXX");
let fs = ffi::CString::new(fs_str).unwrap();
let mut path = fs.as_bytes_with_nul().to_owned();
let path_ptr = path.as_mut_ptr() as *mut _;
// SAFETY: FFI call
let fd = unsafe { libc::mkstemp(path_ptr) };
if fd == -1 {
return Err(Error::SharedFileCreate(std::io::Error::last_os_error()));
}
// SAFETY: FFI call
unsafe { libc::unlink(path_ptr) };
// SAFETY: fd is valid
let f = unsafe { File::from_raw_fd(fd) };
f.set_len(size as u64).map_err(Error::SharedFileSetLen)?;
Ok(FileOffset::new(f, 0))
Err(Error::DirectoryAsBackingFileForMemory)
} else {
let f = OpenOptions::new()
.read(true)
@ -1341,7 +1316,7 @@ impl MemoryManager {
} else {
mmap_flags |= libc::MAP_PRIVATE;
}
Some(Self::open_backing_file(backing_file, file_offset, size)?)
Some(Self::open_backing_file(backing_file, file_offset)?)
} else if shared || hugepages {
// For hugepages we must also MAP_SHARED otherwise we will trigger #4805
// because the MAP_PRIVATE will trigger CoW against the backing file with