H. Peter Anvin wrote:
quoted text
> In other words, reusing the early page tables isn't all that 
> straightforward.  It may easily be that it's better to build a new set 
> of page tables from scratch, however, it would *still* be beneficial 
> to have the early page tables be in the same format as the later one, 
> since it lets us use the fixmap area, and therefore 
> {bt,early}_ioremap() much sooner.

Yes, and it simplifies Xen as it always starts guest domains in the 
appropriate pagetable mode and doesn't let the guest change it on the 
fly.  If early_ioremap depends on non-PAE early pagetables in an 
otherwise PAE kernel, we'd need to go to some effort to make sure all 
the early_ioremap stuff is skipped (which would be possible but 
unpleasant for domU, but very bad in dom0).

    J

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