linux-kernel - Re: [Xen-devel] [xen vMCE RFC V0.2] xen vMCE design

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Message-ID: <4FF2BF3E.90803@amd.com>
Date:	Tue, 3 Jul 2012 11:45:34 +0200
From:	Christoph Egger <Christoph.Egger@....com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Jinsong Liu <jinsong.liu@...el.com>,
	IanCampbell <Ian.Campbell@...rix.com>,
	Ashok Raj <ashok.raj@...el.com>,
	Donald D Dugger <donald.d.dugger@...el.com>,
	Haitao Shan <haitao.shan@...el.com>,
	Jun Nakajima <jun.nakajima@...el.com>,
	Susie Li <susie.li@...el.com>, Tony Luck <tony.luck@...el.com>,
	Will Auld <will.auld@...el.com>,
	Xiantao Zhang <xiantao.zhang@...el.com>,
	Yunhong Jiang <yunhong.jiang@...el.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KeirFraser <keir@....org>
Subject: Re: [Xen-devel] [xen vMCE RFC V0.2] xen vMCE design

On 07/03/12 09:16, Jan Beulich wrote:

>>>> On 02.07.12 at 19:32, "Liu, Jinsong" <jinsong.liu@...el.com> wrote:
>> Thanks AMD's feedback :)
>>
>> This vMCE design foils is basically for Intel MCA, involving many details 
>> specific to Intel.
>> I agree that for x86 Intel and AMD can share logic in many fields. However, 
>> for MCA logic Intel and AMD are quite different, like
>> 1. MSRs interface, e.g. MCG_CAP, MCi_MICS, MCi_CTL2, etc;
>> 2. error injection, AMD provide NMI/single MCE/broadcast MCE, while in our 
>> design only concern broadcast MCE# (and pretend to expose CMCI);
>> 3. MCE handler: currently in xen Intel and AMD mce use different triggle 
>> method and mce handler;
>>
>> Considering the big difference, I suggest we separately provide Intel vMCE 
>> and AMD vMCE (i.e. vmce_intel.c and vmce_amd.c).
> 
> I'm not convinced of the need, and would prefer aiming at a
> shared implementation unless issues arise that make this
> impossible.


I have patches ready that do that. About 80% of mce_intel.c is not
Intel specific. I am just waiting for the feature freeze to end...

Christoph


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