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Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabi


From: Paul Brook
Subject: Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities
Date: Wed, 10 Jun 2009 16:24:28 +0100
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> > caps can be anywhere, but we don't expect it to change during machine
> > execution lifetime.
> >
> > Or I am just confused by the name "pci_device_load" ?
>
> Right. So I want to load an image and it has capability X at offset Y.
> wmask has to match. I don't want to assume that we never change Y
> for the device without breaking old images, so I clear wmask here
> and set it up again after looking up capabilities that I loaded.

We should not be loading state into a different device (or a similar device 
with a different set of capabilities).

If you want to provide backwards compatibility then you should do that by 
creating a device that is the same as the original.  As I mentioned in my 
earlier mail, loading a snapshot should never do anything that can not be 
achieved through normal operation.

Paul





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