Re: [Xen-devel] Commit moratorium for branching Xen 4.9

[Julien Grall <julien.grall@xxxxxxx>]

Hi Jan,

On 26/05/17 07:02, Jan Beulich wrote:
> > > > On 25.05.17 at 20:00, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > On 05/25/2017 01:46 PM, Julien Grall wrote:
> > > On 25/05/17 18:08, Boris Ostrovsky wrote:
> > > > Is this:
> > > >
> > > > https://lists.xenproject.org/archives/html/xen-devel/2017-05/msg02340.html
> > > >
> > > >
> > > > being deferred to the next RC (if we are having one)?
> > > I missed that issue sorry. So far, this patch lacks of
> > > Acked-by/Reviewed-by but as a Tested-by.
> > >
> > > I am aware the patch that introduced the regression (efa9596e9d
> > > "x86/mm: fix incorrect unmapping of 2MB and 1GB pages") was attempting
> > > to prevent breaking down an EPT structure irreversibly when removing
> > > 2MB and 1GB pages. AFAIU, this commit will improve performance, but a
> > > boot regression was introduced on AMD platforms.
> >
> > The regression only affects AMD guests that have maxmem > memory.
> >
> > Since we have a fix in flight my suggestion would be to release-note
> > this issue but not revert the offending patch.
> I'm pretty convinced we can get this sorted before 4.9 goes out,
> so +1 to not reverting right away. I'm not even sure is we may
> notice this in osstest, as I'm uncertain whether there are any
> tests with maxmem > memory.
I haven't spot any failure related to that.

Anyway, I will keep an eye on the patch but I will not consider as a 
blocker for branching.
Cheers,

--
Julien Grall

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