On Monday, 31 of December 2007, Ingo Molnar wrote:
>
> * Rafael J. Wysocki <[email protected]> wrote:
>
> > > ok, just to make sure we are talking about the same thing. Do you
> > > mean we can restore an image saved by v2.6.12 into v2.6.24? I.e. a
> > > 2.6.24 kernel will be able to run a 2.6.12 kernel's hibernation
> > > image, with all the kernel internal data from v2.6.12, etc? No way
> > > can that work.
> >
> > Well, not exactly. The support for different boot and image kernels
> > has only been merged recently, but we can use the current git to
> > restore 2.6.24-rc6-mm1, for example.
> >
> > The trick is to pass a little additional information in the image
> > header that can be used by the boot kernel to locate the entry point
> > to the image kernel and the image kernel's page tables.
>
> ok - i thought you meant that there's a general capability to resume
> across kernel versions. (which would be close to impossible without some
> major surgery.)
Well, there will be one. :-) For example, one should be able to use a 2.6.25+
boot kernel to load the image containing 2.6.24-rc6 and restore the memory
state from it.
> btw., in what way is this different from kexec?
Not that much different indeed. The hibernation code is more focused on
restoring the pre-hibernation state of the system rather than anything else,
plus on ACPI systems we try to handle the platform in accordance with the
specification (to some extent - you'd have to use a non-ACPI boot kernel to
follow the specification literally, which is possible but not straightforward).
Rafael
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