linux-kernel - Re: [RFC V2 0/1] mm/debug: Add tests for architecture exported page table helpers

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Date:   Fri, 9 Aug 2019 12:44:51 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Steven Price <Steven.Price@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Sri Krishna chowdary <schowdary@...dia.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vineet Gupta <vgupta@...opsys.com>,
        James Hogan <jhogan@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        linux-snps-arc@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC V2 0/1] mm/debug: Add tests for architecture exported page
 table helpers

On Fri, Aug 09, 2019 at 03:16:33AM -0700, Matthew Wilcox wrote:
> On Fri, Aug 09, 2019 at 01:03:17PM +0530, Anshuman Khandual wrote:
> > Should alloc_gigantic_page() be made available as an interface for general
> > use in the kernel. The test module here uses very similar implementation from
> > HugeTLB to allocate a PUD aligned memory block. Similar for mm_alloc() which
> > needs to be exported through a header.
> 
> Why are you allocating memory at all instead of just using some
> known-to-exist PFNs like I suggested?

IIUC the issue is that there aren't necessarily known-to-exist PFNs that
are sufficiently aligned -- they may not even exist.

For example, with 64K pages, a PMD covers 512M. The kernel image is
(generally) smaller than 512M, and will be mapped at page granularity.
In that case, any PMD entry for a kernel symbol address will point to
the PTE level table, and that will only necessarily be page-aligned, as
any P?D level table is only necessarily page-aligned.

In the same configuration, you could have less than 512M of total
memory, and none of this memory is necessarily aligned to 512M. So
beyond the PTE level, I don't think you can guarantee a known-to-exist
valid PFN.

I also believe that synthetic PFNs could fail pfn_valid(), so that might
cause us pain too...

Thanks,
Mark.