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

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Date:	Tue, 3 Jul 2012 13:26:37 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Jan Beulich <JBeulich@...e.com>,
	Christoph Egger <Christoph.Egger@....com>,
	"Liu, Jinsong" <jinsong.liu@...el.com>
CC:	IanCampbell <Ian.Campbell@...rix.com>,
	"Raj, Ashok" <ashok.raj@...el.com>,
	"Dugger, Donald D" <donald.d.dugger@...el.com>,
	"Shan, Haitao" <haitao.shan@...el.com>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	"Li, Susie" <susie.li@...el.com>,
	"Auld, Will" <will.auld@...el.com>,
	"Zhang, Xiantao" <xiantao.zhang@...el.com>,
	"Jiang, Yunhong" <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

> 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.

-Tony
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