Re: kexec: reuse 1st kernel as kexec/kdump kernel?

From: Vivek Goyal
Date: Tue Jan 07 2014 - 09:38:20 EST

On Tue, Jan 07, 2014 at 10:34:06AM +0800, Dave Young wrote:
> Hi, all
> I have a question in mind: can we copy and prepare kexec kernel while
> normal booting?
> Just like below wild idea:
> Kernel uncompress itself (assume kernel is relocatable)
> -> copy the kernel image somewhere for backup
> -> reserver crashkernel memory
> -> copy the backuped kernel image/initrd image to reserved memory
> -> copy the purgatory which can be embedded in elf section?
> -> prepare the e820 memory ranges which is for kdump kernel
> So userspace only need to call kexec reboot, kexec_load is not necessary.
> The initrd for kdump should be different, but we can add some different logic
> which will be only for kdump and it can be skipped in normal boot.
> Is it doable?

What's the advantage of doing all this? Why are you trying to skip load

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