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

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Message-ID: <20180216142808.GS7275@dhcp22.suse.cz>
Date:   Fri, 16 Feb 2018 15:28:08 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Juergen Gross <jgross@...e.com>
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 Fri 16-02-18 15:02:17, Juergen Gross wrote:
> 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?

ideally both.
-- 
Michal Hocko
SUSE Labs