linux-kernel - Re: IST stack patches v3.5

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Message-ID: <CALCETrUuEsaDjezeeUYtnBpjGppOZ55c1Dp_Zr2aTbcsvL1qZg@mail.gmail.com>
Date:	Mon, 24 Nov 2014 17:54:47 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: IST stack patches v3.5

On Mon, Nov 24, 2014 at 5:52 PM, Andy Lutomirski <luto@...capital.net> wrote:
> I've tagged v3.5 of my paranoid stack code.  It's in a strange state right now:
>

https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/tag/?h=x86/paranoid&id=paranoid-stack-v3.5

--Andy

> Patch 1 (the actual stack switching) is standalone.  It's not really a
> good base for the memory failure stuff, because all of the ist_enter
> stuff is missing.  It should *work*, but the result will be ugly.
> OTOH, it should be okay as a base for fsgsbase.
>
> Patch 2 is from Paul McKenney.  It fixes RCU NMI nesting, which is a
> prerequisite for ist_enter.  I think that the current plan is for that
> to happen in 3.20.  Speak up if you want it sooner.
>
> Patch 4 is purely for testing.  It forces "NMIs" to nest.
>
> "x86, mce: Improve timeout error messages" is in there so I don't
> forget about it.  Tony and Borislav, if you like it, want to pick it
> up?  It really has very little to do with the rest of this code.
>
> The remainder of the non-atomic IST stuff is in there in a plausibly
> final form, but it's oddly based.
>
> --Andy
>
>
> --
> Andy Lutomirski
> AMA Capital Management, LLC



-- 
Andy Lutomirski
AMA Capital Management, LLC
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