linux-kernel - Re: EFI mixed mode + perf = rampant triple faults

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Message-ID: <20150114184714.GD6902@pd.tnic>
Date:	Wed, 14 Jan 2015 19:47:14 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: EFI mixed mode + perf = rampant triple faults

On Wed, Jan 14, 2015 at 10:38:25AM -0800, Andy Lutomirski wrote:
> That's not a real MCE, though -- it happens synchronously instead of

MCE can be synchronous in a sense too, as a result of executing an insn,
for example, i.e., EIPV bit set.

> at MCE priority with all the associated messiness.  Or is the idea to
> just stick that in after switching to the 32-bit mode being tested?

Yes, the idea was to simply trigger a real exception after switching to
32-bit while still with 64-bit IDT handlers.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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