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

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Message-ID: <CA+8MBbJy3QziFGDzOxMrweWEe_yneETuo4O8bTPZg=2y15qdkQ@mail.gmail.com>
Date:	Tue, 11 Nov 2014 18:06:48 -0800
From:	Tony Luck <tony.luck@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.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>
Subject: Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from userspace

> Innocent bystanders have RIPV=1, EIPV=0 in MCG_STATUS ... so they
> are quite easy to spot.

Bother ... except for the SRAO cases where *everyone* is an innocent
bystander - but someone should go look for the error and queue up
a page offline event.  Perhaps for this we'd do the self-ipi trick and
then scan the banks to look for SRAO signatures to process as well
as clearing MCIP

-Tony
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