[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-API] PCI passthrough limit of device?

  • To: 'James Bulpin' <James.Bulpin@xxxxxxxxxxxxx>
  • From: "Melvin B." <melvinbr@xxxxxxxxxxxx>
  • Date: Mon, 22 Oct 2012 11:16:43 -0400
  • Cc: xen-api@xxxxxxxxxxxxx
  • Delivery-date: Mon, 22 Oct 2012 15:16:56 +0000
  • List-id: User and development list for XCP and XAPI <xen-api.lists.xen.org>
  • Thread-index: Ac2sjCvt4kAcO2HgSdePKg7w3kviAQBZkPPgAIJGrkAADVQLoAAGqcqwAACqs3AABinr0AAAU8UA

But for VT-c, not VT-d.
Does VT-c NIC require SR-IOV in bios, or VT-c NIC can be use only with VT-d,
without SR-IOV feature.

-----Message d'origine-----
De : James Bulpin [mailto:James.Bulpin@xxxxxxxxxxxxx] 
Envoyé : 22 octobre 2012 08:16
À : Melvin B.
Cc : xen-api@xxxxxxx
Objet : RE: [Xen-API] PCI passthrough limit of device?

(Adding the list back to CC - please don't remove the list; by keeping
the discussion public others may be able to benefit from the discussion.)

Melvin wrote:
> My last question is about intel VT-c and SR-IOV NIC.
> If SR-IOV NIC require a Motherboard feature other than VT-d ?

Your BIOS must support SR-IOV.

> And if VT-c is for device only, require only a motherboard with VT-d?

You can perform PCI pass-through to a PV guest without VT-d/IOMMU but that
is unsafe (e.g. the device could DMA to other guests' memory) so VT-d is
recommended. If you want to pass-through to a HVM guest you must use

See http://wiki.xen.org/wiki/Xen_PCI_Passthrough for more detail.


Xen-api mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.