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vmm: Attach all devices from specified segments to the IOMMU

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Since the devices behind the IOMMU cannot be changed at runtime we offer
the ability to place all devices on user chosen segments behind the
IOMMU. This allows the hotplugging of devices behind the IOMMU provided
that they are assigned to a segment that is located behind the iommu.

Fixes: #911

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-02-11 09:33:55 +00:00
parent 6994b33a24
commit 20b9f95afd
1 changed files with 14 additions and 0 deletions
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14
vmm/src/device_manager.rs
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@ -1246,6 +1246,20 @@ impl DeviceManager {
let mut vfio_user_iommu_device_ids = self.add_user_devices()?;
iommu_attached_devices.append(&mut vfio_user_iommu_device_ids);
// Add all devices from forced iommu segments
if let Some(platform_config) = self.config.lock().unwrap().platform.as_ref() {
if let Some(iommu_segments) = platform_config.iommu_segments.as_ref() {
for segment in iommu_segments {
for device in 0..32 {
let bdf = PciBdf::new(*segment, 0, device, 0);
if !iommu_attached_devices.contains(&bdf) {
iommu_attached_devices.push(bdf);
}
}
}
}
}
if let Some(iommu_device) = iommu_device {
let dev_id = self.add_virtio_pci_device(iommu_device, &None, iommu_id, 0)?;
self.iommu_attached_devices = Some((dev_id, iommu_attached_devices));