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

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Message-ID: <54B81C2E.2090909@zytor.com>
Date:	Thu, 15 Jan 2015 11:59:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matt Fleming <matt@...sole-pimps.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	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 01/15/2015 11:41 AM, Matt Fleming wrote:
>>
>> Tianocore makes assumptions about the kernel's GDT layout?  Yuck.
>
> No, but 32-bit Tianocore does rely on the second GDT entry being a
> 32-bit CS.
>
> It has no knowledge of Linux's GDT layout.
>

If it assumes that descriptor 16 is a 32-bit CS (and what about data? 
24?) that *is* making assumptions on the kernel.

	-hpa

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