[Xen-devel] save & restore failed when tmem enabled in Xen 4.1 & Xen 4.3

[yunfang tai <fang8802@xxxxxxxxx>]

Hi all,

  Recently, I am testing the TMEM support on Xen. I discovered that when enabled TMEM in ubuntu 14.10 as guest on Xen 4.1 & Xen 4.3, "xm save" & "xm restoreâ failed after there are more than 1000 pages put in persistent pool of TMEM in Xen. My operations are list as follows:

In ubuntu guest (8 cores , 8GB):

sudo modprobe tmem

(than wait for the selfballoon to finish)

dd if=/dev/zero of=/tmp/test.img bs=10M count=1000

dd if=/tmp/test.img of=/dev/null bs=10M

dd if=/tmp/test.img of=/dev/null bs=10M

.........

(until more than 1000 pages put in persistent pool)

In Domain 0:

(add tmem in grub.cfg)

xm save ubuntu test.save

xm restore ubuntu test.save

When TMEM is not enabled, save & restore success after these operations. But if TMEM is enabled, save & restore fail.

Does anyone test about save & restore when enabled TMEM in Xen?? Is there anything I do wrong?

Thanks!!

Best Regards,

YunfangÂ

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