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SubjectRe: [PATCH] vdpa/mlx5: set_features should allow reset to zero
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On 2021/2/24 4:43 下午, Michael S. Tsirkin wrote:
> 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.


Ok, then we can do the workaround in the qemu, isn't it?

Thanks


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