[virtio-dev] RE: [virtio-comment] Re: [PATCH 00/11] Introduce transitional mmr pci device

Tue, 11 Apr 2023 22:15:57 -0700 


> From: [email protected] <[email protected]
> open.org> On Behalf Of Michael S. Tsirkin

> New issue I found today:
> - if guest disables MSI-X host can not disable MSI-X.
>   need some other channel to notify device about this.
>
I will look into it. 
 
> Old issues we discussed before today:
> - reset needs some special handling because real hardware
>   can not guarantee returning 0 on the 1st read
When done through the legacy MMR as we discussed, it will.

> - if guest writes into mac, reusing host mac (which is RO)
>   will not work, need extra registers
No. Again legacy interface section of MMR behaves as legacy.

> - something about notification makes you want to poke
>   at modern notification register? which of course
>   is its own can of worms with VIRTIO_F_NOTIFICATION_DATA
>   changing the format completely.
There is no NOTIFICATION_DATA with legacy. So it is not applicable.
Format is same with only vq index.

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