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

[Julien Grall <julien.grall@xxxxxxx>]

Hi Boris,

On 25/05/17 18:08, Boris Ostrovsky wrote:
> On 05/25/2017 11:54 AM, Julien Grall wrote:
> > Hi,
> >
> > The patches fixing the 2 outstanding regressions have been merged.
> 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.
As the first regression was not introduced by Xen 4.9 and we lack review 
bandwidth, I would suggest to revert the commit efa9596e9d until we get 
the patch [1] reviewed.
If we managed to review it before the release, then we can consider to 
include both of them. But, at the moment, I would not consider the 
regression fixed by the commit efa9596e9d as a blocker for the release.
Cheers,

[1] 
https://lists.xenproject.org/archives/html/xen-devel/2017-05/msg02340.html
--
Julien Grall

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