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vmm: Add option to control backing files

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Backing files (e.g. for QCOW2) interact badly with landlock since they
are not obvious from the initial VM configuration. Only enable their use
with an explicit option.

Signed-off-by: Rob Bradford <rbradford@meta.com>
Signed-off-by: Bo Chen <bchen@crusoe.ai>
(cherry picked from commit 509832298b)
This commit is contained in:
Rob Bradford
2026-02-08 21:14:28 +00:00
committed by Bo Chen
parent 4c1f854ee9
commit f93340d337
6 changed files with 52 additions and 18 deletions
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31
cloud-hypervisor/tests/integration.rs
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@@ -3412,6 +3412,7 @@ mod common_parallel {
disable_io_uring: bool,
disable_aio: bool,
verify_os_disk: bool,
backing_files: bool,
) {
let disk_config = UbuntuDiskConfig::new(image_name.to_string());
let guest = Guest::new(Box::new(disk_config));
@@ -3432,8 +3433,9 @@ mod common_parallel {
.args([
"--disk",
format!(
"path={}",
guest.disk_config.disk(DiskType::OperatingSystem).unwrap()
"path={},backing_files={}",
guest.disk_config.disk(DiskType::OperatingSystem).unwrap(),
if backing_files { "on"} else {"off"}
)
.as_str(),
format!(
@@ -3503,17 +3505,17 @@ mod common_parallel {
#[test]
fn test_virtio_block_io_uring() {
_test_virtio_block(FOCAL_IMAGE_NAME, false, true, false);
_test_virtio_block(FOCAL_IMAGE_NAME, false, true, false, false);
}
#[test]
fn test_virtio_block_aio() {
_test_virtio_block(FOCAL_IMAGE_NAME, true, false, false);
_test_virtio_block(FOCAL_IMAGE_NAME, true, false, false, false);
}
#[test]
fn test_virtio_block_sync() {
_test_virtio_block(FOCAL_IMAGE_NAME, true, true, false);
_test_virtio_block(FOCAL_IMAGE_NAME, true, true, false, false);
}
/// Uses `qemu-img check` to verify disk image consistency.
@@ -3549,22 +3551,28 @@ mod common_parallel {
#[test]
fn test_virtio_block_qcow2() {
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2, false, false, true);
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2, false, false, true, false);
}
#[test]
fn test_virtio_block_qcow2_zlib() {
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2_ZLIB, false, false, true);
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2_ZLIB, false, false, true, false);
}
#[test]
fn test_virtio_block_qcow2_zstd() {
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2_ZSTD, false, false, true);
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2_ZSTD, false, false, true, false);
}
#[test]
fn test_virtio_block_qcow2_backing_zstd_file() {
_test_virtio_block(JAMMY_IMAGE_NAME_QCOW2_BACKING_ZSTD_FILE, false, false, true);
_test_virtio_block(
JAMMY_IMAGE_NAME_QCOW2_BACKING_ZSTD_FILE,
false,
false,
true,
true,
);
}
#[test]
@@ -3574,6 +3582,7 @@ mod common_parallel {
false,
false,
true,
true,
);
}
@@ -3599,7 +3608,7 @@ mod common_parallel {
.output()
.expect("Expect generating VHD image from RAW image");
_test_virtio_block(FOCAL_IMAGE_NAME_VHD, false, false, false);
_test_virtio_block(FOCAL_IMAGE_NAME_VHD, false, false, false, false);
}
#[test]
@@ -3623,7 +3632,7 @@ mod common_parallel {
.output()
.expect("Expect generating dynamic VHDx image from RAW image");
_test_virtio_block(FOCAL_IMAGE_NAME_VHDX, false, false, true);
_test_virtio_block(FOCAL_IMAGE_NAME_VHDX, false, false, true, false);
}
#[test]