xen: Do not enable PV IPIs when vector callback not present
Fix regression for HVM case on older (<4.1.1) hypervisors caused by commit 99bbb3a8 Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Date: Thu Dec 2 17:55:10 2010 +0000 xen: PV on HVM: support PV spinlocks and IPIs This change replaced the SMP operations with event based handlers without taking into account that this only works when the hypervisor supports callback vectors. This causes unexplainable hangs early on boot for HVM guests with more than one CPU. BugLink: http://bugs.launchpad.net/bugs/791850 CC: stable@kernel.org Signed-off-by:Stefan Bader <stefan.bader@canonical.com> Signed-off-by:
Stefano Stabellini <stefano.stabellini@eu.citrix.com> Tested-and-Reported-by:
Stefan Bader <stefan.bader@canonical.com> Signed-off-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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ccbcdf7c
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