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Subject: Re: [virtio-dev] Re: [PATCH v1] virtio-mmio: Specify wait needed in driver during reset

* Michael S. Tsirkin <mst@redhat.com> [2021-08-16 01:35:46]:

> So thinking about all this, quite early in the setup process we
> have:
>         /* Figure out what features the device supports. */
>         device_features = dev->config->get_features(dev);
> isn't this sufficient? this will flush out
> all writes and device can defer responding to reads
> until reset is complete.

Hmm not sure if that's possible in all MMIO devices? I think a while back Jason
felt some of the MMIO devices, their registers could act as plain DRAM for
reads, which means device can't block such reads?

- vatsa


Qualcomm Innovation Center, Inc. is submitting the attached "feedback" as a
non-member to the virtio-dev mailing list for consideration and inclusion.

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