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Older kernels, such as those found in Debian Squeeze: * Have bugs in handling of AIO into foreign pages * Have blktap modules, which will cause qemu not to use AIO, but which are not loaded on boot. Attempt to load blktap in xencommons, to make sure modern qemu's which use AIO will work properly on those kernels. Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Prefer to load blktap2 if it exists. This is the name of the driver in classic-Xen ports, while in mainline kernels the driver is called just blktap. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jan Beulich <JBeulich@suse.com> Committed-by: Ian Campbell <ian.campbell@citrix.com>