Regarding this issue: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1350375 Please pull in this patch from Linus tree (part of 3.16-rc6): commit ea9f9274bf4337ba7cbab241c780487651642d63 Author: David Vrabel <david.vrabel@xxxxxxxxxx> Date: Mon Jun 16 13:07:00 2014 +0200 x86/xen: no need to explicitly register an NMI callback Remove xen_enable_nmi() to fix a 64-bit guest crash when registering the NMI callback on Xen 3.1 and earlier. It's not needed since the NMI callback is set by a set_trap_table hypercall (in xen_load_idt() or xen_write_idt_entry()). It's also broken since it only set the current VCPU's callback. Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Reported-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Tested-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> It's needed to unbreak kernels v3.12 and later when running on a Xen 3.1.x or earlier hypervisor. - Steven -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html