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

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Jan Beulich" <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] enable port accesses with (almost) fullregister context
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Tue, 12 Sep 2006 01:24:19 +0800
Delivery-date: Mon, 11 Sep 2006 10:25:31 -0700
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Thread-topic: [Xen-devel] [PATCH] enable port accesses with (almost) fullregister context
>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
>ports by allowing it to set a real I/O bitmap? I implemented I/O bitmaps
>emulation mainly because it makes context switching faster and it is less
>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
>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?


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