linux-kernel - Re: [Xen-devel] [PATCH] x86/amd: fix crash as Xen Dom0 on AMD Trinity systems

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: <4FC6597D.4060204@zytor.com>
Date:	Wed, 30 May 2012 10:31:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Jacob Shin <jacob.shin@....com>,
	Andre Przywara <andre.przywara@....com>, jeremy@...p.org,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	Jan Beulich <JBeulich@...e.com>, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: [Xen-devel] [PATCH] x86/amd: fix crash as Xen Dom0 on AMD Trinity
 systems

On 05/30/2012 10:17 AM, Konrad Rzeszutek Wilk wrote:
>> Yes, the following patch also fixed the crash for us:
>>
>> Implement rdmsr_regs and wrmsr_regs for Xen pvops.
> 
> That needs more data. Such as the reason for it, the crash
> tombstone, and an analysis of the bug.
> 
> But at this point I am not sure what we are going to do.
> 
> I think Peter leans towards ripping the .rdmsr_regs/wdmsr_regs
> function out altogether (so altering the amd_rdmsr... to use the
> .rdmsr/.wrdmsr). At which point I think this would all work
> just fine?
> 

No, you can't just do that.  Rip them out as in trap and emulate.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

--
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/