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

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Message-ID: <20150114183546.GC6902@pd.tnic>
Date:	Wed, 14 Jan 2015 19:35:46 +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 10:27:47AM -0800, Andy Lutomirski wrote:
> How are you manually triggering an MCE?  I've been playing with some
> MCE stuff recently, but the only reasonably reliable way I know of to
> trigger an MCE is using WHEA, and I don't have a box with WHEA, and I
> assume your ASUS T100 doesn't either.

asm volatile("int $18");

> Tianocore makes assumptions about the kernel's GDT layout?  Yuck.

Yuck indeed.

-- 
Regards/Gruss,
    Boris.

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