Re: [Xen-devel] q35 support in Xen

[Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>]

On 17-09-19 13:35:19, Alexey G wrote:
> On Sun, 17 Sep 2017 10:49:12 +0800
> Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx> wrote:
> 
> > On 17-09-15 23:12:58, Alexey G wrote:
> > > On Thu, 14 Sep 2017 16:39:32 +0800
> > > Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx> wrote:
> > >   
> > > > Hi, Alexey,
> > > > 
> > > > Have you submitted the patches? If yes, could you please share the
> > > > link?  
> > > 
> > > Sorry, had a lot of work recently -- so far I've managed to submit only
> > > the bugfix for mentioned xen-mapcache issue with emulated AHCI DMA I/O,
> > > which was a main prerequisite for Q35 on Xen.
> > > 
> > > Right now I need to rebase Q35 support patches on recent changes --
> > > there were multiple commits to related parts of code in both Xen and
> > > QEMU while Q35 patches were initially made for Xen 4.8.0 (which I'm
> > > still using at the moment). I'll try rebasing Q35 patches on this
> > > weekend, hopefully there will be no big differences with 4.8.
> > >   
> > Thanks a lot for the update! Do you have a plan for the whole feature?
> > When do you expect all changes can be submitted or get merged?
>  
> Will send the whole set this week, once I refactor patches and write

That is great. Thank you!

> descriptions for them -- for at least one patch it will be a lenghty one,
> I'm afraid. Most Q35 support patches are depend on each other, so it's
> easier to send them in a single batch (one for QEMU and one for Xen in
> fact).
> 
Per my experiences, it would be better to split big patch into several small
pieces so that reviewers are easier to understand. Maintainer Wei, Liu provided
a good method before: you can write what the patch does into commit message,
then you can find if it is possible to split it into some small patches.
Hope it can help.

> Rebasing was done only for stable-4.9.0 currently. As patches will be sent
> as RFC first, I've decided to delay rebasing to latest staging/master a bit
> -- it will require a bit of effort to check the impact of some recent
> commits, so it may be a better idea to collect some feedback on RFC patches
> targeting stable-4.9.0 and rebase a more or less updated version to staging
> then.

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