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vmm: config: Reject VFIO devices with the same path

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By checking in the validation logic we get checking for both devices
specified in the initial config but also hotplug too.

Fixes: #4453

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-08-09 12:14:41 +01:00 committed by Sebastien Boeuf
parent 3c26e9b741
commit 6bc46ba9c1
1 changed files with 37 additions and 1 deletions
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38
vmm/src/config.rs
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@ -175,6 +175,8 @@ pub enum ValidationError {
InvalidIdentifier(String),
/// Placing the device behind a virtual IOMMU is not supported
IommuNotSupported,
/// Duplicated device path (device added twice)
DuplicateDevicePath(String),
}
type ValidationResult<T> = std::result::Result<T, ValidationError>;
@ -270,6 +272,7 @@ impl fmt::Display for ValidationError {
IommuNotSupported => {
write!(f, "Device does not support being placed behind IOMMU")
}
DuplicateDevicePath(p) => write!(f, "Duplicated device path: {}", p),
}
}
}
@ -2464,7 +2467,14 @@ impl VmConfig {
}
if let Some(devices) = &self.devices {
let mut device_paths = BTreeSet::new();
for device in devices {
if !device_paths.insert(device.path.to_string_lossy()) {
return Err(ValidationError::DuplicateDevicePath(
device.path.to_string_lossy().to_string(),
));
}
device.validate(self)?;
self.iommu |= device.iommu;
@ -3657,7 +3667,7 @@ mod tests {
Err(ValidationError::OnIommuSegment(1))
);
let mut invalid_config = valid_config;
let mut invalid_config = valid_config.clone();
invalid_config.memory.shared = true;
invalid_config.platform = Some(PlatformConfig {
num_pci_segments: 16,
@ -3672,5 +3682,31 @@ mod tests {
invalid_config.validate(),
Err(ValidationError::IommuNotSupportedOnSegment(1))
);
let mut still_valid_config = valid_config.clone();
still_valid_config.devices = Some(vec![
DeviceConfig {
path: "/device1".into(),
..Default::default()
},
DeviceConfig {
path: "/device2".into(),
..Default::default()
},
]);
assert!(still_valid_config.validate().is_ok());
let mut invalid_config = valid_config;
invalid_config.devices = Some(vec![
DeviceConfig {
path: "/device1".into(),
..Default::default()
},
DeviceConfig {
path: "/device1".into(),
..Default::default()
},
]);
assert!(invalid_config.validate().is_err());
}
}