[Xen-devel] DomU can't start after recompiling DomU(PV) OS kernel

[謝 東曄 <j0921634545@xxxxxxxxxxxx>]

Xen Version:4.5.5
Guest OS(DomU OS):Ubuntu 14.04 
Old kernel: 4.4.0

new recompile Kernel : 4.4.31

// Install DomU OS in image file
first, i use dd if=/dev/zero of=test.img bs=1M count=20480 to create 20G empty image file.
then use xl create vm.cfg command to create VM.
The configuration file(vm.cfg) is as follows:

kernel = "vmlinuz"
ramdisk = "initrd.img"
name = "test"
memory = "1024"
disk = [ 'file:test.img,xvda,w', ]

vmlinuz and initrd.img is download from http://archive.ubuntu.com/ubuntu/dists/trusty-updates/main/installer-amd64/current/images/netboot/xen/

then use xl console test command to log in and install DomU OS(Ubuntu 14.04).
when DomU OS install complete , I start recompile DomU OS kernel.

// Recompile DomU OS kernel
download linux kernel source from http://www.kernel.org/pub/linux/kernel/v4.x/linux-4.4.31.tar.gz
add some printk in driver/xen/balloon.c.
Configure the DomU OS kernel according to https://wiki.xenproject.org/wiki/Mainline_Linux_Kernel_Configs#Getting_the_Current_Stable_Version

then

make
make modules_install
make install

reboot VM after recompile complete.

Use xl create startVM.cfg command to create VM.
The VM configuration file(startVM.cfg) is as follows:

name = "test"
memory = "1024"
bootloader = 'pygrub'
disk = [ 'file:test.img,xvda,w', ]

but i can't start VM after recompiling DomU OS kernel.

DomU can boot into grub and start successful by choosing other kernel(4.4.0), but when choosing kernel that i compile(4.4.31), it fail(maybe it create and crash immediately).

No error message on the terminal.

Can someone tell me where it is wrong?

THX

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