Re: [Xen-devel] [PATCHv9 0/9] Xen: extend kexec hypercall for use with pv-ops kernels

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 21/10/13 11:21, David Vrabel wrote:
> On 21/10/13 04:11, Xu, YongweiX wrote:
>> Hi, David
>> I have tried to use kexec with upstream xen source(C/S:27758) which has been 
>> put your patches and didn't not work on Dom0. Step as below:
>> 1. use upstream xen and tools with your patch
>> 2. use kexec-tools with branch "remotes/origin/xen-v6"
>> 3. kexec -l -t multiboot-x86 /boot/xen.gz --module="/boot/vmlinuz-xen 
>> root=/dev/sda1 o" --module="/boot/initrd-xen.img"
> 
> kexec segfaults for me here because of a missing command line for Xen.
> Specifying one with --command-line="console=com1 etc" will work around this.
> 
>> 4. kexec -e
>> The phenomenon was that the kernel didn't change, but the network broke.
>>
>> Is there any problem in my operation?
> 
> Yes, you're trying something that is not supported -- see the comment at
> the top of kexec/arch/i386/kexec-multiboot-x86.c.  Only ELF32 images are
> supported.

Huh.  It does sort of work.  There's a 3 minute or so delay between
starting purgatory and Xen starting.

I don't have time to look into this use case (kexec'ing into Xen) so if
you care you'll have to do some digging yourself.

David

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