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

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F3293F681@ORSMSX114.amr.corp.intel.com>
Date:	Tue, 18 Nov 2014 00:22:20 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Borislav Petkov <bp@...en8.de>, 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>,
	Oleg Nesterov <oleg@...hat.com>
Subject: RE: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from
 userspace

> It could also be interesting to tweak mce_panic to not actually panic
> the machine but to try to return and stop the test instead.  Then real
> debugging could be possible :)

The lost cpu is *really* lost.  Warm reset doesn't fix the machine, I usually
have to do a full power cycle.

-Tony