On 2021/2/25 1:52, David Marchand wrote:

On Wed, Feb 24, 2021 at 4:29 PM 谢华伟(此时此刻） [off-list ref] wrote:

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Did you check that virtio devices bound to uio_pci_generic still works
with legacy mode + PIO?

I had verified PIO, might under igb_uio driver.

Well, if you are unsure, please retest both cases, igb_uio and uio_pci_generic.

I still haven't got a VM with PIO, but retested MMIO with both igb_uio 
and uio_pci_generic. They both works.

@Chenbo

Could you help run  with PIO?

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Theoretically it works with uio_pci_generic driver. I could do the test
if needed. Give me some time.  Have to create a legacy VM. Now bars in
virtio device in the cloud are basically mmio.

Sure, take the time to check.
I'll wait for your confirmation, thanks.