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

["Melvin B." <melvinbr@xxxxxxxxxxxx>]

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
VT-d/IOMMU.

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

Cheers,
James


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