the number of PCI pass-through devices limit?

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* the number of PCI pass-through devices limit?
@ 2015-01-26  8:46 Xuekun Hu
  2015-01-26 15:13 ` Alex Williamson
  0 siblings, 1 reply; 2+ messages in thread
From: Xuekun Hu @ 2015-01-26  8:46 UTC (permalink / raw)
  To: kvm

Hi, All

Is there a limit for number of PCI pass-through devices in KVM? For
Legacy PCI device assignement or VFIO pass-through method?

Many thanks.
Thx, Xuekun

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: the number of PCI pass-through devices limit?
  2015-01-26  8:46 the number of PCI pass-through devices limit? Xuekun Hu
@ 2015-01-26 15:13 ` Alex Williamson
  0 siblings, 0 replies; 2+ messages in thread
From: Alex Williamson @ 2015-01-26 15:13 UTC (permalink / raw)
  To: Xuekun Hu; +Cc: kvm

On Mon, 2015-01-26 at 16:46 +0800, Xuekun Hu wrote:
> Hi, All
> 
> Is there a limit for number of PCI pass-through devices in KVM? For
> Legacy PCI device assignement or VFIO pass-through method?

There's no enforced limit, but the usable limit is related to the number
of KVM memory slots available.  Each PCI BAR uses a memory slot
(sometimes two).  If memory slots are exhausted, the the VM aborts.
Thanks,

Alex


^ permalink raw reply	[flat|nested] 2+ messages in thread

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2015-01-26  8:46 the number of PCI pass-through devices limit? Xuekun Hu
2015-01-26 15:13 ` Alex Williamson

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