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

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] enable port accesses with (almost) fullregister context
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Mon, 11 Sep 2006 20:58:41 +0100
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On 11/9/06 6:24 pm, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

> 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?

There's no checking of that kind of thing already. Xen will happily allow
I/O memory and I/O ports to be assigned write access for multiple domains
simultaneously. It's up to control tools, or a sysadmin, to implement or
enforce a more sophisticated policy if that is what is wanted.

 -- Keir

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