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

>>> 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.


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