[libvirt] [PATCH v2 0/2] check IOMMU group devices usage when preparing device for vfio passthrough

[Michal Privoznik]

On 14.01.2015 12:01, Shivaprasad G Bhat wrote:
> ====================================================================
> If a device in the same iommu group is in use by a different vm, the guest boot
> fails with the below error during vfio passthrough.
> bash-4.2$ virsh start demo
> error: Failed to start domain demo
> error: internal error: process exited while connecting to monitor:
> 2014-12-02T13:43:52.020136Z qemu-system-x86_64: -device vfio-pci,host=00:1c.3,id=hostdev0,bus=pci.0,addr=0x5: vfio: error opening /dev/vfio/7: Device or resource busy
> 
> Solution:
> =====================================================================
> The patch iterates through the iommu group devices and errors out cleanly
> mentioning the device and the guest which is using the device.
> 
> With Patch
> bash-4.2$ virsh start demo
> error: Failed to start domain demo
> error: Requested operation is not valid: PCI device 0000:0d:00.0 is in use by driver QEMU, domain vm10
> 
> ---
> 
> Shivaprasad G Bhat (2):
>       Implement virPCIDeviceGetAddress function
>       check IOMMU group devices usage when preparing device for vfio passthrough
> 
> 
>  src/util/virhostdev.c |   89 ++++++++++++++++++++++++++++++-------------------
>  src/util/virpci.c     |   16 +++++++++
>  src/util/virpci.h     |    1 +
>  3 files changed, 72 insertions(+), 34 deletions(-)
> 

I've fixed issues I've raised and pushed.

Michal