[Xen-devel] boot xen use legacy bios

["quizy_jones@xxxxxxxxxxx" <quizy_jones@xxxxxxxxxxx>]

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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