From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Matt Fleming
<matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
Cc: LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: EFI mixed mode + perf = rampant triple faults
Date: Thu, 15 Jan 2015 11:59:42 -0800 [thread overview]
Message-ID: <54B81C2E.2090909@zytor.com> (raw)
In-Reply-To: <20150115194127.GB12079-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
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
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Matt Fleming <matt@console-pimps.org>,
Andy Lutomirski <luto@amacapital.net>
Cc: LKML <linux-kernel@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: EFI mixed mode + perf = rampant triple faults
Date: Thu, 15 Jan 2015 11:59:42 -0800 [thread overview]
Message-ID: <54B81C2E.2090909@zytor.com> (raw)
In-Reply-To: <20150115194127.GB12079@codeblueprint.co.uk>
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
next prev parent reply other threads:[~2015-01-15 19:59 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-17 16:51 EFI mixed mode + perf = rampant triple faults Andy Lutomirski
2014-12-17 16:54 ` Andy Lutomirski
2014-12-31 18:37 ` Matt Fleming
[not found] ` <20141231183739.GA28946-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2015-01-14 16:51 ` Matt Fleming
2015-01-14 16:51 ` Matt Fleming
[not found] ` <20150114165151.GA3479-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2015-01-14 18:27 ` Andy Lutomirski
2015-01-14 18:27 ` Andy Lutomirski
[not found] ` <CALCETrWOxPwoL0zo0UZMk=05uAEqgY-Xovk1=JHwbVtinx3u3w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-14 18:35 ` Borislav Petkov
2015-01-14 18:35 ` Borislav Petkov
2015-01-14 18:38 ` Andy Lutomirski
[not found] ` <CALCETrUEfQY-hnmNV9-PfDbEYLa7bVoRcsZc2X0V+mEAbfNH2g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-14 18:47 ` Borislav Petkov
2015-01-14 18:47 ` Borislav Petkov
2015-01-14 18:49 ` Andy Lutomirski
2015-01-15 19:41 ` Matt Fleming
2015-01-15 19:41 ` Matt Fleming
[not found] ` <20150115194127.GB12079-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2015-01-15 19:59 ` H. Peter Anvin [this message]
2015-01-15 19:59 ` H. Peter Anvin
[not found] ` <54B81C2E.2090909-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2015-01-15 22:21 ` Matt Fleming
2015-01-15 22:21 ` Matt Fleming
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