Re: [PATCH] kexec based hibernation: a prototype of kexec multi-stage load

[ebiederm@xmission.com (Eric W. Biederman)]

"Huang, Ying" <ying.huang@intel.com> writes:

> The disadvantage of this solution is that kernel B must know it is
> original kernel (A) or kexeced kernel (B). Different code should be used
> by kernel A and kernel B. And after jump from A to B, jump from B to A,
> when jump from A to B again, kernel A must use different code from the
> first time.

I don't know what the case is for keeping two kernels in memory and switching
between them.

I suspect a small piece of trampoline code between the two kernels could
handle the case. (i.e. purgatory pays attention).

That is a fundamental aspect of the design.  A general purpose infrastructure
with trampoline code to adapt it to whatever situation comes up.

Eric