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    SubjectRe: [PATCH] vdpa/mlx5: set_features should allow reset to zero
    On Wed, Feb 24, 2021 at 04:26:43PM +0800, Jason Wang wrote:
    > Basically on first guest access QEMU would tell kernel whether
    > guest is using the legacy or the modern interface.
    > E.g. virtio_pci_config_read/virtio_pci_config_write will call ioctl(ENABLE_LEGACY, 1)
    > while virtio_pci_common_read will call ioctl(ENABLE_LEGACY, 0)
    >
    >
    > But this trick work only for PCI I think?
    >
    > Thanks

    ccw has a revision it can check. mmio does not have transitional devices
    at all.

    --
    MST

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