[libvirt] libvirt 1.2.1 vs. Xen 4.1.4

[Jim Fehlig]

Guido Günther wrote:
> Hi,
>
> a user of Debian's libvirt backport to wheezy using Xen reported libvirt
> 1.2.1 failing for him like:
>
>  info : libvirt version: 1.2.1
>  error : virIdentityGetSystem:173 : Unable to lookup SELinux process context: Invalid argument
>  error : xenHypervisorDoV2Sys:1011 : Unable to issue hypervisor ioctl 3166208: Permission denied
>  error : xenHypervisorDoV2Sys:1011 : Unable to issue hypervisor ioctl 3166208: Permission denied
>  error : xenHypervisorDoV2Sys:1011 : Unable to issue hypervisor ioctl 3166208: Permission denied
>  error : xenHypervisorDoV2Sys:1011 : Unable to issue hypervisor ioctl 3166208: Permission denied
>  error : xenHypervisorDoV2Sys:1011 : Unable to issue hypervisor ioctl 3166208: Permission denied
>  error : xend_req:302 : internal error: failed to parse Xend response return code
>  error : xend_req:302 : internal error: failed to parse Xend response return code
>  error : virNetSocketReadWire:1454 : End of file while reading data: Input/output error
>   

I was able to reproduce this with git master and Xen 4.1.6.  The
attached patch fixes it for me.

Regards,
Jim
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