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

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Date:	Tue, 03 Jul 2012 16:08:28 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Christoph Egger" <Christoph.Egger@....com>,
	"Tony Luck" <tony.luck@...el.com>
Cc:	"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>,
	"Jinsong Liu" <jinsong.liu@...el.com>,
	"Jun Nakajima" <jun.nakajima@...el.com>,
	"Susie Li" <susie.li@...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 03.07.12 at 16:50, Christoph Egger <Christoph.Egger@....com> wrote:
> On 07/03/12 15:26, Luck, Tony wrote:
> 
>>> I'm not convinced of the need, and would prefer aiming at a
>>> shared implementation unless issues arise that make this
>>> impossible.
>> 
>> It does sound odd. Yes, Intel and AMD have differences around CMCI ... but 
> we are never
>> going to send a CMCI to a guest (there is no point, it can't do anything 
> useful with the
>> information, it may do something pointlessly stupid like stop using a guest 
> physical page).
>> The only reason I suggested making MCG_CAP pretend that CMCI was supported 
> was a
>> small optimization ... if a Linux guest sees that CMCI is supported, it will 
> not poll the machine
>> check banks looking for corrected errors.
> 
> 
> Are you talking about PV or HVM guest?
> 
> For HVM guests yes it makes sense to disable CMCI in MCG_CAP for both
> AMD and Intel.

"enable" you mean?

Jan

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