linux-kernel - Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from userspace

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Message-ID: <CALCETrXTxJnEejqV_LjrDHO6Pur5afhYERneZD+2KrshH28tVQ@mail.gmail.com>
Date:	Fri, 14 Nov 2014 09:18:51 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	"Luck, Tony" <tony.luck@...el.com>, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from userspace

On Nov 14, 2014 2:34 AM, "Borislav Petkov" <bp@...en8.de> wrote:
>
> On Wed, Nov 12, 2014 at 07:03:21PM -0800, Andy Lutomirski wrote:
> > printk seems to work just fine in do_machine_check.
>
> That must be pure luck. Has anything changed which I missed to make
> printk NMI-safe?

Heh.  Probably not.  Now I wonder whether that might have caused the
scheduling in idle cpu thing.

Grr.  Do you or Tony have any pointers for how to test this myself?  I
don't know enough about the acpi error injection thing, which I assume
is that Tony is using.

--Andy

>
> --
> Regards/Gruss,
>     Boris.
>
> Sent from a fat crate under my desk. Formatting is fine.
> --
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