Xen devel - Jul 2010 - Question about backporting pci passthrough fix to 2.6.18

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@oracle.com  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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On Thu, Jul 01, 2010 at 10:04:01AM +0100, Paraic Gallagher
wrote:
> 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.
You should be able to do it. The SysFS parts might need some
tweaking.
> 
> 
> ------- Comment #1 from konrad.wilk@oracle.com  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.
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

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