linux-kernel - Re: [patch 1/2] x2apic: fix reserved APIC register accesses in print_local

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.55.0809032145020.23174@cliff.in.clinika.pl>
Date:	Wed, 3 Sep 2008 22:28:18 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
cc:	"mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [patch 1/2] x2apic: fix reserved APIC register accesses in
 print_local_APIC()

On Wed, 3 Sep 2008, Suresh Siddha wrote:

> from SDV Vol 3a Section 17.27.1
> 
>   The remote read delivery mode provided in the 82489DX and local APIC for
>   Pentium processors is not supported in the local APIC in the Pentium 4, Intel
>   Xeon, and P6 family processors.
> 
> It looks like it is not supported (officially atleast) even in APIC bus
> architectures. Only the Pentium integrated APIC seems to be the exception.

 Yeah, trust documentation and see where you'll get... ;)

> I have to probably use maxlvt check, to selectively enable this debug output
> for Pentium and !APIC_INTEGRATED check for 82489DX.

 Sounds about right.  Why couldn't have the designers simply bump up the
bloody APIC version when they introduced or removed functionality other
than LVT entries, sigh?...  It's not that they are going to run out of
numbers anytime soon.

  Maciej
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/