Re: [Qemu-devel] [PATCH 09/26] ehci: Use uframe precision for interrupt threshold checking

[Hans de Goede]

Hi,

On 12/17/2012 02:16 PM, Gerd Hoffmann wrote:
> On 12/14/12 14:35, Hans de Goede wrote:
> > Note that a shadow variable is used instead of changing frindex to
> > uframe accuracy because we must send a frindex which is a multiple of 8
> > during migration for migration compatibility, and rounding it down to
> > a multiple of 8 pre-migration, can lead to frindex going backwards from
> > the guest pov.
>
> Jumping forward instead?

You mean rounding the send frindex up pre-migration, I didn't really consider
that as it will cause us skipping processing an entry in the periodic frame
list. I guess doing that on migration isn't too bad. OTOH giving the guest
only frame accuracy like we've been doing till now also works fine...

Your choice :)

Regards,

Hans