[Xen-devel] Question about backporting pci passthrough fix to 2.6.18

[Paraic Gallagher <paraic.gallagher@xxxxxxxxx>]

Hi,

I have a question about the bug:
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1632

This is marked as fixed in the pv-ops kernel.

I am working for a company developing a xen based virtualisation solution. 
Unfortunately the design is tied to CentOS and there is resistance to upgrade to > 2.6.31 kernel.

My question is whether it is possible for me to try to backport the fixes for this pci passthrough issue to a 2.6.18 kernel, or are there too many differences between the kernel versions to make this feasible/possible. 

thanks all,
Páraic.

------- Comment #1 from konrad.wilk@xxxxxxxxxx  2010-06-30 07:54 -------
There is a fix for this in the pv-ops kernel.

Specifically:
 xen-pciback: Allocate IRQ handler for device that is shared with guest.
     xen-pciback: Add SysFS instrumentation for the fake IRQ handler.
     xen-pciback: When device transitions to MSI/MSI-X stop ACK-ing on the
legacy interrupt.
     xen-pciback: Enable interrupt handler when device is enabled.
     xen-pciback: Probe the IRQ line to check if it is not shared

Here is a howto on PV-OPS:http://wiki.xensource.com/xenwiki/XenParavirtOps
and how to migrate from RHEL5 to it
http://wiki.xensource.com/xenwiki/2.6.18-to-2.6.31-and-higher

Closing bug as FIXED in upstream.

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