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xen-users
RE: [Xen-users] Multiple VMs Using Multiple Video Cards w/Pacifica
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> Steve Higton
> Sent: 02 May 2006 22:41
> To: Xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Multiple VMs Using Multiple Video Cards
> w/Pacifica
>
> Hi All,
>
> I've read a few references to the imminent AMD AM2 CPUs
> including Pacifica technology and that these CPUs have an
> io-mmu (I may have spelt that wrong or used incorrectly
> terminology, if it's not an io-mmu it's something that allows
> devices on the PCI/PCI-express bus to have their memory
> remapped.) WIll this enable XenU domains to have access to
> multiple video cards? I would like to be able to have two
> XenU domains have a PCI-express video card each to run two
> independent displays in either Windows XP or Linux.
The short answer is: Probably not immediately.
Let's first sort out the naming of things: The code-name pacifica is now
called AMD Virtulization Technology or Secure Virtual Machine extension,
SVM for short.
IOMMU is a technology that isn't implemented in the first generation SVM
processors, but will come in future processors [I don't honestly know at
which point in the future]. But yes, this technology will, amongst other
things, allow the mapping of virtualized "pseudo-physical" memory to
"real physical" memory.
We do have an alternative, which is to use the GART for this. This has
been implemented in the x86-64 kernel for quite some time [to remap
IO-buffers from above 4GB to below 4GB so that 32-bit hardware can
access memory above 4GB], but so far there is no solution for Xen to use
this method, although I believe there is work in progress to make this.
The second problem is that the PCI device hiding for Dom0 isn't
implemented for HVM systems. I think this is also being worked on (or at
least it's on someones list to be done when they get to that item on the
list or something like that).
--
Mats
>
> Thanks,
>
> Steve.
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>
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