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Re: [Qemu-devel] [PATCH 05/11] qemu: MSI-X support functions

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH 05/11] qemu: MSI-X support functions
Date: Wed, 10 Jun 2009 18:52:38 +0300
User-agent: Mutt/1.5.18 (2008-05-17)

On Wed, Jun 10, 2009 at 04:15:04PM +0100, Paul Brook wrote:
> > > That's seems just plain wrong to me.
> > > Loading a VM shouldn't not
> > > do anything that can't happen during normal operation.
> >
> > At least wrt pci, we are very far from this state: load just overwrites
> > all registers, readonly or not, which can never happen during normal
> > operation.
> IMO that code is wrong. We should only be loading things that the guest can 
> change (directly or indirectly).
> Paul

Making it work this way will mean that minor changes to a device can
break backwards compatibility with old images, often in surprising ways.
What are the advantages?


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