linux-kernel - Re: [PATCH v4 2/5] x86, traps: Track entry into and exit from IST context

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Message-ID: <CALCETrWFBEvL4CSD+cZ0inMcvv09rLJi4Wpf4gLz5fvsGcV-wQ@mail.gmail.com>
Date:	Wed, 10 Dec 2014 16:24:46 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Tony Luck <tony.luck@...il.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	X86 ML <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Josh Triplett <josh@...htriplett.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v4 2/5] x86, traps: Track entry into and exit from IST context

On Wed, Dec 10, 2014 at 4:22 PM, Tony Luck <tony.luck@...il.com> wrote:
> On Tue, Nov 25, 2014 at 10:58 AM, Borislav Petkov <bp@...en8.de> wrote:
>> On Mon, Nov 24, 2014 at 03:52:10PM -0800, Andy Lutomirski wrote:
>>> Dunno. Tony and Borislav -- when do you want the IST stack switching
>>> stuff?
>>
>> I'd leave that up to Tony and his testbench. I mean, we can hammer on
>> it as much as we can and it can pass all testing locally but the real
>> fun starts once it hits upstream and for that it doesn't matter which
>> release... IMHO.
>
> So what was the net result of all the mode/RCU discussions?
>
> Do I need some extra magic incantations in the final version
> of do_machine_check() beyond what was in this patch:
>
>   https://lkml.kernel.org/r/546d169211835aded@agluck-desk.sc.intel.com
>
> to make everything happy?
>

I think you need ist_begin_non_atomic() before local_irq_enable() and
ist_end_non_atomic() after local_irq_disable().  Otherwise it should
be good.

--Andy

> -Tony



-- 
Andy Lutomirski
AMA Capital Management, LLC
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