linux-kernel - Re: [PATCH] mm: don't defer struct page initialization for Xen pv guests

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Message-ID: <1424bb25-7d6a-ee21-83b4-0e90369d6132@suse.com>
Date:   Fri, 16 Feb 2018 15:02:17 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        xen-devel@...ts.xenproject.org, akpm@...ux-foundation.org,
        stable@...r.kernel.org, Pavel Tatashin <pasha.tatashin@...cle.com>
Subject: Re: [PATCH] mm: don't defer struct page initialization for Xen pv
 guests

On 16/02/18 14:59, Michal Hocko wrote:
> [CC Pavel]
> 
> On Fri 16-02-18 14:37:26, Juergen Gross wrote:
>> Commit f7f99100d8d95dbcf09e0216a143211e79418b9f ("mm: stop zeroing
>> memory during allocation in vmemmap") broke Xen pv domains in some
>> configurations, as the "Pinned" information in struct page of early
>> page tables could get lost.
> 
> Could you be more specific please?

In which way? Do you want to see the resulting crash in the commit
message or some more background information?

> 
>> Avoid this problem by not deferring struct page initialization when
>> running as Xen pv guest.
>>
>> Cc: <stable@...r.kernel.org> #4.15
> Fixes: f7f99100d8d9 ("mm: stop zeroing memory during allocation in vmemmap")
> 
> please

Okay.


Juergen