From: David Hopwood <david.nospam.hopwood@blueyonder.co.uk>
To: xen-devel@lists.xensource.com
Subject: Re: frontend and backend devices and different types of hw - pci for example
Date: Sun, 04 Sep 2005 14:35:44 +0100 [thread overview]
Message-ID: <431AF830.2000700@blueyonder.co.uk> (raw)
In-Reply-To: <200509040423.51526.mark.williamson@cl.cam.ac.uk>
Mark Williamson wrote:
> While I'm on the subject, I'd personally like to see guests granted IO access
> slightly differently. There are two ways to grant IO access on x86: change
> the IOPL (giving the guest access to all IO ports) or set IO bits in the TSS
> (giving fine grained control). The problem with the latter is that guest
> *apps* will be able to access the hardware; essentially x86 gives you coarse
> grained control and ring-level protection, or vice-versa.
Could XenLinux use a different TSS to run its apps?
--
David Hopwood <david.nospam.hopwood@blueyonder.co.uk>
next prev parent reply other threads:[~2005-09-04 13:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-28 7:28 frontend and backend devices and different types of hw - pci for example Sting Zax
2005-08-28 15:25 ` Mark Williamson
2005-08-29 6:57 ` Sting Zax
2005-08-29 8:59 ` Keir Fraser
2005-08-29 10:45 ` Mark Williamson
2005-08-29 19:48 ` Stefan Berger
2005-09-03 17:46 ` Mark Williamson
2005-09-03 18:42 ` Stefan Berger
2005-09-04 3:23 ` Mark Williamson
2005-09-04 13:35 ` David Hopwood [this message]
2005-09-06 21:59 ` Stefan Berger
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