[dpdk-dev] [PATCH v11 0/2] support both PIO and MMIO BAR for legacy virito device

[David Marchand]

Hello,

On Thu, Mar 11, 2021 at 12:55 PM Wang, Yinan <yinan.wang at intel.com> wrote:
>
> Tested-by: Wang, Yinan <yinan.wang at intel.com>
>
> Tested PVP case with virtio PMD assumes legacy device, VM with below kernel LTS versions, all pass except vfio-pci test blocked with kernel v4.4.
> 5.10.0-051000-generic                     virtio-pmd test with  vfio-pci/ igb_uio/uio_pci_generic  all pass
> 5.4.0-050400-generic                       virtio-pmd test with  vfio-pci/ igb_uio/uio_pci_generic  all pass
> 4.19.179-0419179-generic             virtio-pmd test with  vfio-pci/ igb_uio/uio_pci_generic  all pass
> 4.9.260-0409260-generic               virtio-pmd test with  vfio-pci/ igb_uio/uio_pci_generic  all pass
> 4.4.260-0404260-generic               virtio-pmd test with  igb_uio/uio_pci_generic can pass ; vfio-pci blocked as fail to bind vfio-pci to virtio-pmd
>
> Error info:
> root at vmubuntu2004:~/dpdk/usertools# ./dpdk-devbind.py -b vfio-pci 00:04.0
> lspci: Unable to load libkmod resources: error -12
>
> root at vmubuntu2004:~/dpdk/usertools# dmesg
> [  161.553493] VFIO - User Level meta-driver version: 0.3
> [  179.430529] vfio-pci: probe of 0000:00:04.0 failed with error -22

The vanilla stable 4.4 kernel does not support "No-IOMMU mode" for vfio.
ae5515d66362 - Revert: "vfio: Include No-IOMMU mode" (5 years ago)
<Alex Williamson>

So this behavior is expected if you were testing with no iommu in your
virtual machine.


Thanks for the tests!

-- 
David Marchand