RE: [Xen-devel] [PATCH] enable port accesses with (almost) fullregister context

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Keir Fraser
>Sent: 2006年9月11日 9:19
>Would it be cleaner to allow dom0 to have really direct access to some
>I/O
>ports by allowing it to set a real I/O bitmap? I implemented I/O bitmaps
>via
>emulation mainly because it makes context switching faster and it is less
>of
>a pain to keep admin and guest bitmasks in sync if they are checked
>synchronously. But a direct dom0-only bitmap would be a bit easier:
>quick to
>turn on/off and no need to sync with admin bitmaps. Main downside is
>that
>it'll slow down context-switch paths a little bit.
>
> -- Keir
>

Hi, Keir,
        Say in the driver domain case, does dom0-only bitmap need to sync with 
admin bitmaps? Or simply depend on the assumption that dom0 won't use io ports 
granted to other domains?

Thanks,
Kevin

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel