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
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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