pci passthrough and live migration

pci passthrough and live migration

[Tommy]

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Hello, everybody!

I've done some research on Xenlive migration recently.

I've checked the maillist for pci passthrough and live migration, I
can't figure out the current progress on them.

Does Xen support live migration with pci passthrough? How about that
with vga passthrough?

If it is supported now, what extra configurations do I need?

If not, could anyone give some ideas on what is the main difficulties
for it?

At last, does anyone have some documents about this area?

Thanks!


-- 

Yours Sincerely!



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Re: pci passthrough and live migration

[Konrad Rzeszutek Wilk]

On Tue, Oct 25, 2011 at 03:33:10PM +0800, Tommy wrote:
> Hello, everybody!
> 
> I've done some research on Xenlive migration recently.

XenLive? What is that? Oh, is that the CentOS4..
> 
> I've checked the maillist for pci passthrough and live migration, I
> can't figure out the current progress on them.

Did you check the Wiki?
> 
> Does Xen support live migration with pci passthrough? How about that
> with vga passthrough?

You can do it with SR-IOV, but normal PCI passthrough would not work that well.

> 
> If it is supported now, what extra configurations do I need?

It definitly is supported in the kernel.. you need to use 'pci-attach'
command and hardware that can do IOMMU if you want to do it with HVM.

If you want to do with PV, you need to pass 'iommu=soft' on the Linux
command line.


However, before the migration, you _must_ hot-unplug the pci-device - you
can use 'pci-detach' and then on the other end do 'pci-attach'.

I am not sure if the tools do this automatically but they might.
> 
> If not, could anyone give some ideas on what is the main difficulties
> for it?
> 
> At last, does anyone have some documents about this area?

Just search for SR-IOV and Xen.
> 
> Thanks!
> 
> 
> -- 
> 
> Yours Sincerely!
> 
> 

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