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xen-users
Re: [Xen-users] pci passthrough and svm
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Forgot to CC, so here is a copy of my answer.
Forwardl:
Von: Paul Schulze <avlex@xxxxxxx>
Datum: 10. September 2008 19:33:57 MESZ
An: mpower@xxxxxxxxxxxxxxxxxx
Betreff: Re: [Xen-users] pci passthrough and svm
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Hi Mike,
The bad news (as far as my understanding of this goes, no clue if
its technically correct): At the moment, there is no AMD equivalent
for VT-d. AMD SVM is a CPU virtualization extension, comparable
with IVT. VT-d, is an IOMMU, that probably resides with the memory
controller and handles virtualization and protection of DMA. So in
case of an Intel CPU on the mainboard (no clue if it needs special
support on the CPU on top of that). AMD first announced to
implement an equivalent to that technology quite a few years ago,
but up until now there are no products I can think of that include
such a feature. However, CPUs, supporting it are rumored to be
released early in 2009, so there is hope (for me too, because my
Xen server is built on AMD hardware as well).
And the good news: Even though there is no IOMMU support on AMD
platforms, it is possible to pass PCI hardware through to a
paravirtualized DomU. This feature does not depend on VT-d, with
the exception of PCI passthrough to HVM domains (to Windows for
example). Like I said, I am on an AMD platform and I have succeeded
in passing though multiple devices, including USB controllers,
audio devices and network devices (no graphics cards though).
However, when passing PCI devices to a paravirtualized domain,
always remember that there is no protection against faulty or
malicious memory access due to the missing IOMMU, enabling the DomU
to potentially access even Dom0 memory.
Cheers,
Paul.
- --
Paul Schulze
Mail: avlex gmx net ($1@$2.$3)
Public Key: http://solaris-net.dyndns.org/keys/key_avlex.asc
"Making mistakes is human,
but to really screw things up, you need Computers"
Am 10.09.2008 um 17:50 schrieb Mike Power:
I noticed talk of pci passthrough seems to always be in reference
to VT_D which from my understanding is an intel technology. Is
there equivalent and xen enabled functionality from AMD's svm
technology?
Mike Power
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http://lists.xensource.com/xen-users
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- --
Paul Schulze
Mail: avlex gmx net ($1@$2.$3)
Public Key: http://solaris-net.dyndns.org/keys/key_avlex.asc
"Making mistakes is human,
but to really screw things up, you need Computers"
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