From: Joanna Rutkowska <joanna@invisiblethingslab.com>
To: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: feature suggestion: DMAR table emulation for Xen
Date: Thu, 13 May 2010 16:14:00 +0200 [thread overview]
Message-ID: <4BEC0928.8090604@invisiblethingslab.com> (raw)
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As many people on this list realize, lots of machines that have VT-d in
hardware, effectively does not support VT-d because of broken BIOSes
that usually do not expose DMAR ACPI table at all (or do it with some
bugs?).
So, the idea is to implement dmar emulation for Xen. E.g. if we pass
certain boot option, e.g. emulate_chipset4_dmar, then Xen would read
DMAR table from the image hardcoded into the Xen hypervisor.
We could provide images for series 4 and 5 chipsets. I think there are
no differences in how DMAR table looks between various specific chipsets
from the same family (e.g. Q45 would be probably using the very same
DMAR as PM45). Can somebody from Intel confirm this?
Implementing such a feature would make it possible to use Xen w/ IOMMU
support on many newer machines that otherwise do not support it.
joanna.
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next reply other threads:[~2010-05-13 14:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-13 14:14 Joanna Rutkowska [this message]
2010-05-14 5:41 ` feature suggestion: DMAR table emulation for Xen Kay, Allen M
2010-05-14 9:22 ` Joanna Rutkowska
2010-05-14 9:35 ` Keir Fraser
2010-05-14 10:15 ` Joanna Rutkowska
2010-05-14 10:48 ` Keir Fraser
2010-05-14 10:58 ` Joanna Rutkowska
2010-05-14 11:29 ` Keir Fraser
2010-05-14 11:47 ` philosophically about IGD pass-through (was: feature suggestion: DMAR table emulation for Xen) Joanna Rutkowska
2010-05-14 11:58 ` James Harper
2010-05-14 12:30 ` Keir Fraser
2010-05-14 15:57 ` Dan Magenheimer
2010-05-14 16:43 ` philosophically about IGD pass-through Joanna Rutkowska
2010-05-14 17:54 ` philosophically about IGD pass-through (was: feature suggestion: DMAR table emulation for Xen) Kay, Allen M
2010-05-15 16:54 ` feature suggestion: DMAR table emulation for Xen Ian Pratt
2010-05-15 17:12 ` IGD passthrough security (was Re: feature suggestion: DMAR table emulation for Xen) Joanna Rutkowska
2010-05-14 9:41 ` feature suggestion: DMAR table emulation for Xen Barde Kaushik 00901718
2010-05-14 10:16 ` Joanna Rutkowska
2010-05-14 14:25 ` Barde Kaushik 00901718
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