Re: [PATCH V4 00/24] IOREQ feature (+ virtio-mmio) on Arm

[Oleksandr <olekstysh@xxxxxxxxx>]

On 14.01.21 18:11, Ian Jackson wrote:

Hi Ian

> Hi, thanks for giving this update.
>
> Since you were the only person who took the time to send such an
> update I feel I can spend some time on trying to help with any
> obstacles you may face.
Thank you.


>    
> Hence this enquiry:
> Oleksandr writes ("Re: [ANNOUNCE] Xen 4.15 release schedule and feature 
> tracking"):
> > I work on virtio-mmio on Arm which involves x86's IOREQ/DM features.
> > Currently I am working on making the said features common, implementing
> > missing bits, code cleanup an hardening, etc.
> > I don't think the virtio-mmio is a 4.15 material, but it would be great
> > have at least "common" IOREQ/DM in 4.15.
> ..
> > > P: your current estimate of the probability it making 4.15, as a %age
> > Difficult to say, it depends ...
> > RFC was posted Aug 3, 2020, The last posted version is V3. Currently I
> > am in the middle of preparing v4, still need to find a common ground for
> > few bits.
> So, I'm replying to V4 here.  Did you resolve your issues ?
I think, yes. I hope, I addressed all review сomments/requests for V3.


> What are the major outstanding risks to this series and do you need
> any help from the Xen Project (eg from me as Release Manager) ?
I would like to get the review for V4 for me to be able to make the 
required changes in time.
Last 2 patches could be skipped for now, I don't expect the VirtIO to be 
in 4.15
(I keep these patches for visibility reason and test purposes):
- libxl: Introduce basic virtio-mmio support on Arm
- [RFC] libxl: Add support for virtio-disk configuration
But, first 22 patches (IOREQ/DM) I would like to see in 4.15.

Also what worries me the most is that a quite big series hasn't been 
fully tested on x86 (only build tested).

> NB I have not been following this series in detail - I'm just looking
> at your mail and your 00/ posting and so on.  So if there is some
> blocker or risk I am probably unaware of it.
>
> I notice that there's one libxl RFC patch in there.  Since that's in
> my bailiwick I will try to review it soon.
Thank you, please note, this RFC patch is not a target for 4.15, no rush)
For the next version I will drop these VirtIO related patches.


--
Regards,

Oleksandr Tyshchenko