linux-kernel - Re: [PATCH v12 4/6] arm64: support copy_mc_[user]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240821122848.00004047@Huawei.com>
Date: Wed, 21 Aug 2024 12:28:48 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Tong Tiangen <tongtiangen@...wei.com>
CC: Mark Rutland <mark.rutland@....com>, Catalin Marinas
	<catalin.marinas@....com>, Will Deacon <will@...nel.org>, Andrew Morton
	<akpm@...ux-foundation.org>, James Morse <james.morse@....com>, "Robin
 Murphy" <robin.murphy@....com>, Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>, Vincenzo Frascino
	<vincenzo.frascino@....com>, Michael Ellerman <mpe@...erman.id.au>, Nicholas
 Piggin <npiggin@...il.com>, Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>, Christophe Leroy
	<christophe.leroy@...roup.eu>, Aneesh Kumar K.V <aneesh.kumar@...nel.org>,
	"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>, Thomas Gleixner
	<tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov
	<bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mm@...ck.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <wangkefeng.wang@...wei.com>, Guohanjun
	<guohanjun@...wei.com>
Subject: Re: [PATCH v12 4/6] arm64: support copy_mc_[user]_highpage()

On Tue, 20 Aug 2024 11:02:05 +0800
Tong Tiangen <tongtiangen@...wei.com> wrote:

> 在 2024/8/19 19:56, Jonathan Cameron 写道:
> > On Tue, 28 May 2024 16:59:13 +0800
> > Tong Tiangen <tongtiangen@...wei.com> wrote:
> >   
> >> Currently, many scenarios that can tolerate memory errors when copying page
> >> have been supported in the kernel[1~5], all of which are implemented by
> >> copy_mc_[user]_highpage(). arm64 should also support this mechanism.
> >>
> >> Due to mte, arm64 needs to have its own copy_mc_[user]_highpage()
> >> architecture implementation, macros __HAVE_ARCH_COPY_MC_HIGHPAGE and
> >> __HAVE_ARCH_COPY_MC_USER_HIGHPAGE have been added to control it.
> >>
> >> Add new helper copy_mc_page() which provide a page copy implementation with
> >> hardware memory error safe. The code logic of copy_mc_page() is the same as
> >> copy_page(), the main difference is that the ldp insn of copy_mc_page()
> >> contains the fixup type EX_TYPE_KACCESS_ERR_ZERO_ME_SAFE, therefore, the
> >> main logic is extracted to copy_page_template.S.
> >>
> >> [1] commit d302c2398ba2 ("mm, hwpoison: when copy-on-write hits poison, take page offline")
> >> [2] commit 1cb9dc4b475c ("mm: hwpoison: support recovery from HugePage copy-on-write faults")
> >> [3] commit 6b970599e807 ("mm: hwpoison: support recovery from ksm_might_need_to_copy()")
> >> [4] commit 98c76c9f1ef7 ("mm/khugepaged: recover from poisoned anonymous memory")
> >> [5] commit 12904d953364 ("mm/khugepaged: recover from poisoned file-backed memory")
> >>
> >> Signed-off-by: Tong Tiangen <tongtiangen@...wei.com>  
> > Trivial stuff inline.
> > 
> > Jonathan  
> 
> I'm sorry, I may not have understood what you meant. Where is the better
> place to do inline? :)
Oops. All I meant was:

My comments are inline - as in within the patch later in the email.