linux-kernel - Re: Xenner design and kvm msr handling

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Message-ID: <49EDF131.9060705@redhat.com>
Date:	Tue, 21 Apr 2009 19:15:45 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gerd Hoffmann <kraxel@...hat.com>
CC:	Anthony Liguori <anthony@...emonkey.ws>,
	Huang Ying <ying.huang@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: Xenner design and kvm msr handling

Gerd Hoffmann wrote:
> On 04/21/09 15:33, Avi Kivity wrote:
>> Gerd Hoffmann wrote:
>>> Not sure, have to dig into the xen code to figure.
>>>
>>> Could be xen doesn't remember the page in the first place. They might
>>> let the illegal instruction fault handler patch the opcode. At least I
>>> vaguely remember some discussions about that.
>
> Xen does a simple msr-triggered memcpy() as well, without keeping 
> track of the page.  On a quick glimpse I can't find a opcode patching 
> place either.  Hmm.
>

Maybe migration is cooperative, that is the host tells the guest it is 
migrated, so it can re-register the hypercall area?

-- 
error compiling committee.c: too many arguments to function

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