From: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
To: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
Cc: Matt Fleming
<matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@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: Wed, 14 Jan 2015 19:47:14 +0100 [thread overview]
Message-ID: <20150114184714.GD6902@pd.tnic> (raw)
In-Reply-To: <CALCETrUEfQY-hnmNV9-PfDbEYLa7bVoRcsZc2X0V+mEAbfNH2g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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.
--
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Matt Fleming <matt@console-pimps.org>,
LKML <linux-kernel@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
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: Wed, 14 Jan 2015 19:47:14 +0100 [thread overview]
Message-ID: <20150114184714.GD6902@pd.tnic> (raw)
In-Reply-To: <CALCETrUEfQY-hnmNV9-PfDbEYLa7bVoRcsZc2X0V+mEAbfNH2g@mail.gmail.com>
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.
--
next prev parent reply other threads:[~2015-01-14 18:47 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 [this message]
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
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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