On Monday, 28 of January 2008, H. Peter Anvin wrote:
quoted text
> Jeremy Fitzhardinge wrote:
> > H. Peter Anvin wrote:
> >>  and we already have to have code to synchronize the PGDs on !PAE and 
> >> the PMDs on Xen (although that was supposedly getting fixed).
> > 
> > No, I don't have any plans there.  Xen will continue to require 
> > non-shared kernel pmd, at least for a 32-bit host.  I think the point is 
> > that nothing that requires an identity mapping will work under Xen 
> > anyway, so Xen just doesn't care about this case.
> > 
> 
> Still makes it a special case, not just for this.

In fact swsusp creates its own temporary page tables for restoring the last
part of the image.  Please have a look at
arch/x86/kernel/suspend_*_64.c and the files in arch/x86/power (most
importantly suspend.c).

Thanks,
Rafael
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