linux-kernel - [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0

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>] [day] [month] [year] [list]

Message-ID: <20124.12795.279739.528005@mariner.uk.xensource.com>
Date:	Mon, 17 Oct 2011 14:47:39 +0100
From:	Ian Jackson <Ian.Jackson@...citrix.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	the arch/x86 maintainers <x86@...nel.org>,
	Borislav Petkov <bp@...64.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode
 update in Xen dom0

H. Peter Anvin writes ("[Xen-devel] Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0"):
> On 10/12/2011 12:18 PM, Jeremy Fitzhardinge wrote:
> > But for right now, this patch seems like the pragmatic solution.
> 
> No.

This is a quite astonishing response.  At the moment, microcode
updates in Xen systems are _completely broken_ because they do not
happen at all.

The existing machinery in Linux is the way it is and you say it's no
good - how about we just remove it all too ?  Because that's what
you're suggesting is the proper course for Xen!

At the moment, Jeremy's patch is a significant improvement.  It is
quite unreasonable to block it because some pie-in-the-sky scheme for
doing it at boot time does not exist yet.

Either:
 (a) Jeremy's patch should go in
 (b) all after-boot microcode update code should be removed from Linux

Ian.
(very cross)
--
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/