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vmm, virtio-devices: Deny zero sector writes for autodetected raw images

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If the disk image was autodetected to raw (not specified with image_type
= 0) then in the virtio-block subsystem generate errors for writes to
block 0 (treat as if read-only). This gives an immediate error vs using
the image implementations in the block subsystem.

Signed-off-by: Rob Bradford <rbradford@meta.com>
This commit is contained in:
Rob Bradford
2026-02-15 22:51:56 +00:00
committed by Bo Chen
parent 6f2357c14e
commit b3e8e2abc5
3 changed files with 29 additions and 4 deletions
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8
vmm/src/device_manager.rs
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@@ -2677,13 +2677,18 @@ impl DeviceManager {
let detected_image_type =
detect_image_type(&mut file).map_err(DeviceManagerError::DetectImageType)?;
let mut disable_sector0_writes = false;
if disk_cfg.image_type == ImageType::Unknown {
warn!(
"No image_type specified - detected as {detected_image_type}. \
Configuration updated to persist type across reboots and migrations."
);
if detected_image_type != ImageType::Raw {
if detected_image_type == ImageType::Raw {
warn!("Autodetected raw image type. Disabling sector 0 writes.");
disable_sector0_writes = true;
} else {
warn!(
"Non-raw image type detected. In the future it will be necessary \
to specify image_type for non-raw files."
@@ -2850,6 +2855,7 @@ impl DeviceManager {
.map_err(DeviceManagerError::RestoreGetState)?,
queue_affinity,
disk_cfg.sparse,
disable_sector0_writes,
)
.map_err(DeviceManagerError::CreateVirtioBlock)?;