[libvirt] [PATCH 0/2] check IOMMU group devices usage during vfio device passthrough

[Shivaprasad bhat]

Ping!

Thanks,
Shiva

On Thu, Dec 4, 2014 at 12:56 PM, Shivaprasad G Bhat
<shivaprasadbhat at gmail.com> wrote:
> Problem:
> ====================================================================
> 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):
>       Move struct _virPCIDevice definition from virpci.c to virpci.h
>       check IOMMU group devices usage when preparing device for vfio passthrough
>
>
>  src/util/virhostdev.c |   87 +++++++++++++++++++++++++++++--------------------
>  src/util/virpci.c     |   29 ----------------
>  src/util/virpci.h     |   30 +++++++++++++++++
>  3 files changed, 82 insertions(+), 64 deletions(-)
>
> --
> Signature
>
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