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

[Juergen Gross <jgross@xxxxxxxx>]

On 06/26/2017 08:37 AM, 謝 東曄 wrote:
> 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?
Not with the data you provided.

Things you should try:

- use the kernel config of the working kernel (it  might be provided via
  /proc/config.gz)
- build a ramdisk matching the new kernel (from the steps you mentioned
  above you might still use the old one)
- add "earlyprintk=xen" to the kernel's boot options. Use "xl dmesg" to
  check for error messages issued during early boot process
- post your kernel config

Juergen

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