From: Borislav Petkov <bp@alien8.de>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
x86@kernel.org
Subject: Re: [x86] only print out DR registers if they are not power-on defaults.
Date: Wed, 19 Jun 2013 23:52:34 +0200 [thread overview]
Message-ID: <20130619215233.GU28300@pd.tnic> (raw)
In-Reply-To: <51C225D9.8070100@zytor.com>
On Wed, Jun 19, 2013 at 02:42:49PM -0700, H. Peter Anvin wrote:
> There is serious confusion with regards to DR6 about the bits which
> are *fixed* (forced to 1) and the ones which are *reserved* (should
> always have a fixed value.)
>
> There are some bits in DR6 which are used by hardware probes.
Haha, I knew it! HW guys don't care about the architectural documents.
Maybe DR6 should probably be dropped altogether from the check before
exiting __show_regs early?
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
next prev parent reply other threads:[~2013-06-19 21:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-18 4:11 [x86] only print out DR registers if they are not power-on defaults Dave Jones
2013-06-18 8:43 ` Borislav Petkov
2013-06-18 14:07 ` Dave Jones
2013-06-18 15:59 ` Borislav Petkov
2013-06-18 16:09 ` [x86][v2] " Dave Jones
2013-06-18 17:08 ` Borislav Petkov
2013-06-19 18:42 ` [tip:x86/debug] x86/debug: Only " tip-bot for Dave Jones
2013-06-19 21:42 ` [x86] only " H. Peter Anvin
2013-06-19 21:52 ` Borislav Petkov [this message]
2013-06-19 22:02 ` H. Peter Anvin
2013-06-20 5:29 ` Borislav Petkov
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