Re: [dpdk-dev] [PATCH v4] pci: support both PIO and MMIO BAR for legacy virtio on x86

[谢华伟(此时此刻）]

        switch (p->dev->kdrv) {
  #ifdef VFIO_PRESENT
        case RTE_PCI_KDRV_VFIO:
-               pci_vfio_ioport_read(p, data, len, offset);
+               pci_uio_ioport_read(p, data, len, offset);
                break;
  #endif
        case RTE_PCI_KDRV_IGB_UIO:
-               pci_uio_ioport_read(p, data, len, offset);
-               break;
        case RTE_PCI_KDRV_UIO_GENERIC:
                pci_uio_ioport_read(p, data, len, offset);
  }


Maxime:

With this patch, virtio PIO/MMIO port RW is directly through user space 
instruction instead of vfio ioctl syscall.

/huawei