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[Xen-devel] boot xen use legacy bios



I got the problem of multiple cores CPU cannot be fully used when using UEFI mode. It is suggested that I should be boot the xen in legacy mode. How is it done? 
My environment: Xen 4.1.2, PowerEdge R730xd E5-2603 v3 @ 1.60GHz, ubuntu 14.04 kernel 3.13.0-24-generic
Some References I use:
http://www.gossamer-threads.com/lists/xen/devel/266383 
http://wiki.xenproject.org/wiki/Xen_EFI#Booting_Xen_under_EFI_platform 
http://lists.xenproject.org/archives/html/xen-users/2013-03/msg00239.html 
http://wiki.xenproject.org/wiki/Xen_EFI#Booting_Xen_under_EFI_platform 
http://xenbits.xenproject.org/docs/unstable/misc/efi.html 

Here are the files  in /boot/efi/EFI/xen$ ls
initrd.img-3.13.0-24-generic          xen-4.4.1.cfg  xen-4.4.1.gz
vmlinuz-3.13.0-24-generic.efi.signed  xen-4.4.1.efi

And the content of xen.4.4.1.cfg
[global]
default=sle11sp2
[sle11sp2]
options=console=vga,com1 com1=57600 loglvl=all noreboot
kernel=xen-4.4.1.efi root=/dev/sda1 ro console=tty1 console=hvc0
ramdisk=xen-4.4.1.gz

When I run "efibootmgr -w -L Xen -l "\EFI\Xen\xen.efi" -c",  it shows:
$ efibootmgr -w -L Xen -l "\EFI\Xen\xen-4.4.1.efi" -c
Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.
Try 'modprobe efivars' as root.

I tried modprobe efiwars and still generate the same error. Directly reboot the system from BIOS doesn't success.

Any suggestions?
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