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With this patch, the cpuidle driver does not load and does not issue the mwait operations. Instead the hypervisor is doing them (b/c we call the safe_halt pvops call). This fixes quite a lot of bootup issues wherein the user had to force interrupts for the continuation of the bootup. Details are discussed in: http://lists.xensource.com/archives/html/xen-devel/2011-01/msg00535.html [v2: Wrote the commit description] Reported-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Tested-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>