linux-kernel - RE: [Xen-devel] [PATCH 1/3] Add mcelog support for xen platform

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Date:	Mon, 23 Apr 2012 15:43:47 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	"Luck, Tony" <tony.luck@...el.com>, Borislav Petkov <bp@...64.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: RE: [Xen-devel] [PATCH 1/3] Add mcelog support for xen platform

Luck, Tony wrote:
>> Because, if you'd hooked into it, just imagine one fine day, when we
>> remove mcelog support, what screaming the xen people will be doing
>> when mcelog doesn't work anymore.
> 
> Agreed. Even before we get to deleting mcelog, "struct mce" can
> change (new fields could be added) ... and you don't want to have
> your hypervisor to have to know which version of Linux it is talking
> to. 
> 

Hmm, adding new fields block neither native nor xen -- xen just ignore new added fields, that would be no problem for xen:
/* Fields are zero when not available */
struct mce {
	...
}

and, hypervisor only record error into its mc_info cookie (in its own format), it doesn't care what's dom0's version and how dom0 translate it -- that's dom0's business. The role of hypervisor is virtual 'platform', just like h/w platform don't care what linux version runs over it.


Thanks,
Jinsong--
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