From: Tony Luck <tony.luck@gmail.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>,
Dan Williams <dan.j.williams@intel.com>,
Andy Lutomirski <luto@amacapital.net>,
linux-nvdimm <linux-nvdimm@ml01.01.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Robert <elliott@hpe.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
X86 ML <x86@kernel.org>
Subject: Re: [PATCH v8 3/3] x86, mce: Add __mcsafe_copy()
Date: Wed, 13 Jan 2016 15:22:58 -0800 [thread overview]
Message-ID: <CA+8MBbJpFWdkwC-yvmDFdFuLrchv2-XhPd3fk8A_hqOOyzm5og@mail.gmail.com> (raw)
In-Reply-To: <20160111104425.GA29448@gmail.com>
On Mon, Jan 11, 2016 at 2:44 AM, Ingo Molnar <mingo@kernel.org> wrote:
> So such a synthetic CPUID bit would definitely be useful.
>
> Also, knowing whether a memcpy function is recoverable or not, should not be
> delegated to callers: there should be the regular memcpy APIs, plus new APIs that
> do everything they can to provide recoverable memory copies. Whether it's achieved
> via flag checking, a function pointer or code patching is an implementation detail
> that's not visible to drivers making use of the new facility.
>
> I'd go for the simplest, most robust solution initially, also perhaps with boot
> time messages to make sure users know which variant is used and now.
Are there some examples of synthetic CPUID bits? I grepped around and
found a handful of places making ad hoc decisions based on sub-strings of
x86_model_id[] ... but didn't find any systematic approach.
-Tony
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next prev parent reply other threads:[~2016-01-13 23:23 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-09 0:04 [PATCH v8 0/3] Machine check recovery when kernel accesses poison Tony Luck
2015-12-31 19:40 ` [PATCH v8 2/3] x86, mce: Check for faults tagged in EXTABLE_CLASS_FAULT exception table entries Tony Luck
2016-01-08 20:49 ` [PATCH v8 1/3] x86: Expand exception table to allow new handling options Tony Luck
2016-01-09 1:52 ` Andy Lutomirski
2016-01-09 3:39 ` Brian Gerst
2016-01-09 4:31 ` Brian Gerst
2016-01-09 6:36 ` Andy Lutomirski
2016-01-11 23:09 ` Brian Gerst
2016-01-11 23:22 ` Andy Lutomirski
2016-01-11 23:48 ` Luck, Tony
2016-01-09 17:45 ` Tony Luck
2016-01-09 18:00 ` Andy Lutomirski
2016-01-09 19:51 ` Tony Luck
2016-01-09 22:32 ` Andy Lutomirski
2016-01-10 1:15 ` Tony Luck
2016-01-11 0:25 ` Luck, Tony
2016-01-08 21:18 ` [PATCH v8 3/3] x86, mce: Add __mcsafe_copy() Tony Luck
2016-01-09 1:49 ` Andy Lutomirski
2016-01-09 17:48 ` Tony Luck
2016-01-09 17:57 ` Andy Lutomirski
2016-01-09 19:39 ` Tony Luck
2016-01-09 22:15 ` Dan Williams
2016-01-09 22:33 ` Andy Lutomirski
2016-01-10 0:23 ` Dan Williams
2016-01-10 1:40 ` Tony Luck
2016-01-10 11:26 ` Borislav Petkov
2016-01-11 10:44 ` Ingo Molnar
2016-01-13 23:22 ` Tony Luck [this message]
2016-01-14 4:39 ` Borislav Petkov
2016-01-30 0:35 ` Tony Luck
2016-01-30 10:28 ` Borislav Petkov
2016-02-01 23:10 ` Tony Luck
2016-02-01 23:16 ` Dan Williams
2016-01-12 0:26 ` Luck, Tony
2016-01-12 0:30 ` Andy Lutomirski
2016-01-12 0:37 ` Andy Lutomirski
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