Hi everyone,
I'm updating my dev environment to use the shiny new vfio
infrastructure for PCI assignment to kvm guests, and I'm not able to
do what I used to do with the old-school KVM passthrough. In
particular, I have, say, a two-port QLogic adapter that looks like:
82:00.0 0200: 1077:8030 (rev 02)
82:00.1 0200: 1077:8030 (rev 02)
82:00.2 0c04: 1077:8031 (rev 02)
82:00.3 0c04: 1077:8031 (rev 02)
82:00.4 0280: 1077:8032 (rev 02)
82:00.5 0280: 1077:8032 (rev 02)
that is, each port gets three different PCI functions (one for NIC,
one for FCoE and one for iSCSI).
I used to be able to assign 82:00.2 to one VM and 82:00.3 to a
different VM by binding those devices to pci_stub and using "-device
pci-assign,host=82:00.2" and "-device pci-assign,host=82:00.3" on my
respective QEMU command lines. (That let me have an initiator and
target in separate VMs with one adapter in one dev system)
However, all of those PCI devices have the same iommu_group, so now if
I bind the devices to vfio-pci and do "s/pci-assign/vfio-pci/", the
second QEMU to start fails with something like
qemu-system-x86_64: -device vfio-pci,host=82:00.3: vfio: error
opening /dev/vfio/41: Device or resource busy
qemu-system-x86_64: -device vfio-pci,host=82:00.3: vfio: failed to
get group 41
qemu-system-x86_64: -device vfio-pci,host=82:00.3: Device
initialization failed.
qemu-system-x86_64: -device vfio-pci,host=82:00.3: Device
'vfio-pci' could not be initialized
Is there a way to split multi-function devices (with the same
iommu_group) between VMs with vfio?
Thanks!
Roland
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