From: Borislav Petkov <bp@alien8.de>
To: Tony Luck <tony.luck@gmail.com>, Andy Lutomirski <luto@amacapital.net>
Cc: linux-nvdimm <linux-nvdimm@ml01.01.org>, X86 ML <x86@kernel.org>,
"elliott@hpe.com" <elliott@hpe.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Williams, Dan J" <dan.j.williams@intel.com>,
Ingo Molnar <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCHV5 3/3] x86, ras: Add __mcsafe_copy() function to recover from machine checks
Date: Sun, 27 Dec 2015 11:09:19 +0100 [thread overview]
Message-ID: <20151227100919.GA19398@nazgul.tnic> (raw)
In-Reply-To: <CA+8MBbJcw8dRW3DBYW-EhcOiGYFCm7HUxwG-df67wJCOqMpz0A@mail.gmail.com>
On Sat, Dec 26, 2015 at 10:57:26PM -0800, Tony Luck wrote:
> ... will get the right value. Maybe this would still work out
> if the fixup is a 31-bit value plus a flag, but the external
> tool thinks it is a 32-bit value? I'd have to ponder that.
I still fail to see why do we need to make it so complicated and can't
do something like:
fixup_exception:
...
#ifdef CONFIG_MCE_KERNEL_RECOVERY
if (regs->ip >= (unsigned long)__mcsafe_copy &&
regs->ip <= (unsigned long)__mcsafe_copy_end)
run_special_handler();
#endif
and that special handler does all the stuff we want. And we pass
X86_TRAP* etc through fixup_exception along with whatever else we
need from the trap handler...
Hmmm?
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
next prev parent reply other threads:[~2015-12-27 10:09 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-24 20:54 [PATCHV4 0/3] Machine check recovery when kernel accesses poison Tony Luck
2015-12-16 1:29 ` [PATCHV4 1/3] x86, ras: Add new infrastructure for machine check fixup tables Tony Luck
2015-12-16 1:29 ` [PATCHV4 2/3] x86, ras: Extend machine check recovery code to annotated ring0 areas Tony Luck
2015-12-16 1:30 ` [PATCHV4 3/3] x86, ras: Add __mcsafe_copy() function to recover from machine checks Tony Luck
2015-12-24 21:46 ` Borislav Petkov
2015-12-16 1:30 ` [PATCHV5 " Tony Luck
2015-12-25 11:49 ` Borislav Petkov
2015-12-25 20:05 ` Luck, Tony
2015-12-26 10:32 ` Borislav Petkov
2015-12-26 14:54 ` Andy Lutomirski
2015-12-27 2:08 ` Tony Luck
2015-12-27 2:15 ` Andy Lutomirski
2015-12-27 2:16 ` Andy Lutomirski
2015-12-27 6:57 ` Tony Luck
2015-12-27 10:09 ` Borislav Petkov [this message]
2015-12-27 12:19 ` Andy Lutomirski
2015-12-27 13:17 ` Boris Petkov
2015-12-27 13:25 ` Andy Lutomirski
2015-12-27 13:33 ` Borislav Petkov
2015-12-27 13:40 ` Andy Lutomirski
2015-12-27 19:04 ` Dan Williams
2015-12-27 12:18 ` Andy Lutomirski
2015-12-30 23:32 ` Tony Luck
2015-12-31 20:30 ` Tony Luck
2015-12-31 21:22 ` Andy Lutomirski
2016-01-01 22:19 ` Tony Luck
2016-01-03 3:40 ` Andy Lutomirski
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