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df -h
/dev/sda1 511M 31M 481M 7% /boot/efi

~/boot/efi$ du
3420    ./EFI/ubuntu
8       ./EFI/Dell/BootOptionCache
12      ./EFI/Dell
28268   ./EFI/xen     //this is where i put the xen related files
31704   ./EFI
31708   .

/boot/efi/EFI$ ls xen
initrd.img-3.13.0-24-generic vmlinuz-3.13.0-24-generic xen.cfg xen.efi

xen$ cat xen.cfg
[global]
default=xen
[xen]
options=console=vga,com1 com1=57600 loglvl=all noreboot dom0_mem=8g,max:8g
kernel=vmlinuz-3.13.0-24-generic root=/dev/mapper/xen--vg-root ro #earlyprintk=xen
ramdisk=initrd.img-3.13.0-24-generic

However, the 'efibootmgr' cmd fails as follows and the UEFI shell could only detect the ubuntu item as http://snag.gy/hSnDs.jpg shows.

'efibootmgr -v' outputs

Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.
Try 'modprobe efivars' as root.

As this article suggests https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-that-actually-work-then/ ,

I'm probably in a compatitable bios mode instead of the UEFI native boot is actually used using the detecting method.

This is the detailed BIOS settings: http://snag.gy/v8XeJ.jpg http://snag.gy/hSnDs.jpg http://snag.gy/pQz7o.jpg http://snag.gy/6TdqJ.jpg

Any hints? Is the config wrong or the location?

quizy_jones@xxxxxxxxxxx

From: quizy_jones@xxxxxxxxxxx
Date: 2015-11-29 19:26
To: xen-devel
Subject: [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?

Re: [Xen-devel] boot xen use legacy bios