From: Borislav Petkov <bp@alien8.de>
To: Tony Luck <tony.luck@gmail.com>
Cc: 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>, Ingo Molnar <mingo@kernel.org>,
"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: Sun, 10 Jan 2016 12:26:35 +0100 [thread overview]
Message-ID: <20160110112635.GC22896@pd.tnic> (raw)
In-Reply-To: <CA+8MBbLFb1gdhFWeG-3V4=gHd-fHK_n1oJEFCrYiNa8Af6XAng@mail.gmail.com>
On Sat, Jan 09, 2016 at 05:40:05PM -0800, Tony Luck wrote:
> BUT ... it's all going to be very messy. We don't have any CPUID
> capability bits to say whether we support recovery, or which instructions
> are good/bad choices for recovery.
We can always define synthetic ones and set them after having checked
MCA capability bits, f/m/s, etc., maybe even based on the list you're
supplying...
> Linux code recently got some recovery bits for AMD cpus ... I don't
> know what the story is on which models support this,
You mean this?
/*
* overflow_recov is supported for F15h Models 00h-0fh
* even though we don't have a CPUID bit for it.
*/
if (c->x86 == 0x15 && c->x86_model <= 0xf)
mce_flags.overflow_recov = 1;
If so, that's just an improvement which makes MCi_STATUS[Overflow] MCEs
non-fatal.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Tony Luck <tony.luck@gmail.com>
Cc: 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>, Ingo Molnar <mingo@kernel.org>,
"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: Sun, 10 Jan 2016 12:26:35 +0100 [thread overview]
Message-ID: <20160110112635.GC22896@pd.tnic> (raw)
In-Reply-To: <CA+8MBbLFb1gdhFWeG-3V4=gHd-fHK_n1oJEFCrYiNa8Af6XAng@mail.gmail.com>
On Sat, Jan 09, 2016 at 05:40:05PM -0800, Tony Luck wrote:
> BUT ... it's all going to be very messy. We don't have any CPUID
> capability bits to say whether we support recovery, or which instructions
> are good/bad choices for recovery.
We can always define synthetic ones and set them after having checked
MCA capability bits, f/m/s, etc., maybe even based on the list you're
supplying...
> Linux code recently got some recovery bits for AMD cpus ... I don't
> know what the story is on which models support this,
You mean this?
/*
* overflow_recov is supported for F15h Models 00h-0fh
* even though we don't have a CPUID bit for it.
*/
if (c->x86 == 0x15 && c->x86_model <= 0xf)
mce_flags.overflow_recov = 1;
If so, that's just an improvement which makes MCi_STATUS[Overflow] MCEs
non-fatal.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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next prev parent reply other threads:[~2016-01-10 11:26 UTC|newest]
Thread overview: 72+ 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
2016-01-09 0:04 ` 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
2015-12-31 19:40 ` Tony Luck
2016-01-08 20:49 ` [PATCH v8 1/3] x86: Expand exception table to allow new handling options Tony Luck
2016-01-08 20:49 ` Tony Luck
2016-01-09 1:52 ` Andy Lutomirski
2016-01-09 1:52 ` Andy Lutomirski
2016-01-09 3:39 ` Brian Gerst
2016-01-09 3:39 ` Brian Gerst
2016-01-09 4:31 ` Brian Gerst
2016-01-09 4:31 ` Brian Gerst
2016-01-09 6:36 ` Andy Lutomirski
2016-01-09 6:36 ` Andy Lutomirski
2016-01-11 23:09 ` Brian Gerst
2016-01-11 23:09 ` Brian Gerst
2016-01-11 23:22 ` Andy Lutomirski
2016-01-11 23:22 ` Andy Lutomirski
2016-01-11 23:48 ` Luck, Tony
2016-01-11 23:48 ` Luck, Tony
2016-01-09 17:45 ` Tony Luck
2016-01-09 17:45 ` Tony Luck
2016-01-09 18:00 ` Andy Lutomirski
2016-01-09 18:00 ` Andy Lutomirski
2016-01-09 19:51 ` Tony Luck
2016-01-09 19:51 ` Tony Luck
2016-01-09 22:32 ` Andy Lutomirski
2016-01-09 22:32 ` Andy Lutomirski
2016-01-10 1:15 ` Tony Luck
2016-01-10 1:15 ` Tony Luck
2016-01-11 0:25 ` Luck, Tony
2016-01-11 0:25 ` Luck, Tony
2016-01-08 21:18 ` [PATCH v8 3/3] x86, mce: Add __mcsafe_copy() Tony Luck
2016-01-08 21:18 ` Tony Luck
2016-01-09 1:49 ` Andy Lutomirski
2016-01-09 1:49 ` Andy Lutomirski
2016-01-09 17:48 ` Tony Luck
2016-01-09 17:48 ` Tony Luck
2016-01-09 17:57 ` Andy Lutomirski
2016-01-09 17:57 ` Andy Lutomirski
2016-01-09 19:39 ` Tony Luck
2016-01-09 19:39 ` Tony Luck
2016-01-09 22:15 ` Dan Williams
2016-01-09 22:15 ` Dan Williams
2016-01-09 22:33 ` Andy Lutomirski
2016-01-09 22:33 ` Andy Lutomirski
2016-01-10 0:23 ` Dan Williams
2016-01-10 0:23 ` Dan Williams
2016-01-10 1:40 ` Tony Luck
2016-01-10 1:40 ` Tony Luck
2016-01-10 11:26 ` Borislav Petkov [this message]
2016-01-10 11:26 ` Borislav Petkov
2016-01-11 10:44 ` Ingo Molnar
2016-01-11 10:44 ` Ingo Molnar
2016-01-13 23:22 ` Tony Luck
2016-01-13 23:22 ` Tony Luck
2016-01-14 4:39 ` Borislav Petkov
2016-01-14 4:39 ` Borislav Petkov
2016-01-30 0:35 ` Tony Luck
2016-01-30 0:35 ` Tony Luck
2016-01-30 10:28 ` Borislav Petkov
2016-01-30 10:28 ` Borislav Petkov
2016-02-01 23:10 ` Tony Luck
2016-02-01 23:10 ` Tony Luck
2016-02-01 23:16 ` Dan Williams
2016-02-01 23:16 ` Dan Williams
2016-01-12 0:26 ` Luck, Tony
2016-01-12 0:26 ` Luck, Tony
2016-01-12 0:30 ` Andy Lutomirski
2016-01-12 0:30 ` Andy Lutomirski
2016-01-12 0:37 ` Andy Lutomirski
2016-01-12 0:37 ` Andy Lutomirski
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