linux-kernel - Re: [PATCH v4 0/7] mm/mprotect: Fix dax puds

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Message-Id: <20240807142316.bbad141a106093b6f36249e2@linux-foundation.org>
Date: Wed, 7 Aug 2024 14:23:16 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Peter Xu <peterx@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, "Aneesh Kumar K . V"
 <aneesh.kumar@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, Oscar
 Salvador <osalvador@...e.de>, Dan Williams <dan.j.williams@...el.com>,
 James Houghton <jthoughton@...gle.com>, Matthew Wilcox
 <willy@...radead.org>, Nicholas Piggin <npiggin@...il.com>, Rik van Riel
 <riel@...riel.com>, Dave Jiang <dave.jiang@...el.com>, x86@...nel.org, Ingo
 Molnar <mingo@...hat.com>, Rick P Edgecombe <rick.p.edgecombe@...el.com>,
 "Kirill A . Shutemov" <kirill@...temov.name>,
 linuxppc-dev@...ts.ozlabs.org, Mel Gorman <mgorman@...hsingularity.net>,
 Hugh Dickins <hughd@...gle.com>, Borislav Petkov <bp@...en8.de>, David
 Hildenbrand <david@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
 Vlastimil Babka <vbabka@...e.cz>, Dave Hansen
 <dave.hansen@...ux.intel.com>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Huang Ying <ying.huang@...el.com>
Subject: Re: [PATCH v4 0/7] mm/mprotect: Fix dax puds

On Wed,  7 Aug 2024 15:48:04 -0400 Peter Xu <peterx@...hat.com> wrote:

> 
> Tests
> =====
> 
> What I did test:
> 
> - cross-build tests that I normally cover [1]
> 
> - smoke tested on x86_64 the simplest program [2] on dev_dax 1G PUD
>   mprotect() using QEMU's nvdimm emulations [3] and ndctl to create
>   namespaces with proper alignments, which used to throw "bad pud" but now
>   it'll run through all fine.  I checked sigbus happens if with illegal
>   access on protected puds.
> 
> - vmtests.
> 
> What I didn't test:
> 
> - fsdax: I wanted to also give it a shot, but only until then I noticed it
>   doesn't seem to be supported (according to dax_iomap_fault(), which will
>   always fallback on PUD_ORDER).  I did remember it was supported before, I
>   could miss something important there.. please shoot if so.

OK.  Who are you addressing this question to?

> - userfault wp-async: I also wanted to test userfault-wp async be able to
>   split huge puds (here it's simply a clear_pud.. though), but it won't
>   work for devdax anyway due to not allowed to do smaller than 1G faults in
>   this case. So skip too.

Sounds OK.  So that's an additional project if anyone cares enough?

> - Power, as no hardware on hand.

Hopefully the powerpc people can help with that.  What tests do you ask
that they run?