Jeremy Fitzhardinge wrote:
H. Peter Anvin wrote:
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).
Yeah, and it's ugly for the kernel proper, so that bit is a no-brainer.
It's just a matter of hammering out the details.
It doesn't sound from the above that you have any opinion either way
about reusing the initial page tables or creating a new set, as long as
they're in the same format.
-hpa
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