Re: Xenner design and kvm msr handling
From: Avi Kivity
Date: Tue Apr 21 2009 - 12:16:12 EST
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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