On Fri, 2007-07-20 at 08:48 -0700, [email protected] wrote:
> > Backuping target memory before kexec and restoring it after kexec is
> > planed feature for kexec jump. But I will work on image writing/reading
> > first.
>
> if we can get a list of what memory is safe to backup/restore then the
> reading/writing of the image should be able to be done in userspace.
The backup/restore here has nothing to do with the read/write of the
image. It means instead of preserving memory for a new kernel like that
of crash-dump, the memory for a new kernel is backupped before kexec and
restored after kexec by the kexec kernel.
> > If the "scatter copy" is replaced by "scatter swap", we need not the
> > inverse list, and the state of kexeced kernel can be backuped too. There
> > are "scatter copy" support in normal kexec implementation in
> > "relocate_kernel".
>
> what do you mean by "scatter swap"
copy: dest=src
swap: tmp=dest; dest=src; src=tmp
If memory is swapped, no information is lost, both that of kexec kernel
and kexeced kernel.
Best Regards,
Huang, Ying
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