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AssigningDevices changed

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Instruction how to bring device back to dom0
This commit is contained in:
Marek Marczykowski-Górecki 2014-05-29 12:24:11 +00:00
parent e8ffb7111b
commit 245ede5b53
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AssigningDevices.md
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@ -79,3 +79,23 @@ kernelopts : iommu=soft swiotlb=2048 (default)
```
This is [​known to be needed](https://groups.google.com/group/qubes-devel/browse_thread/thread/631c4a3a9d1186e3) for Realtek RTL8111DL Gigabit Ethernet Controller.
Bringing PCI device back to dom0
--------------------------------
By default device detached from some VM (or when VM with PCI device attached get shut down) isn't attached back to dom0. This is an intended feature. A device which was previously assigned to a less trusted AppVM could attack dom0 if it were automatically reassigned there. In order to re-enable the device in dom0, either:
1. Reboot the physical machine.
or
1. Go to the sysfs (`/sys/bus/pci`), find the right device, detach it from the pciback driver and attach back to the original driver. Replace `<BDF>` with your device, for example `00:1c.2`:
``` {.wiki}
echo 0000:<BDF> > /sys/bus/pci/drivers/pciback/unbind
MODALIAS=`cat /sys/bus/pci/devices/0000:<BDF>/modalias`
MOD=`modprobe -R $MODALIAS | head -n 1`
echo <BDF> > /sys/bus/pci/drivers/$MOD/bind
```