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xen-devel
Re: [Xen-devel] Hypercall interface changes for PAE
On 31 May 2005, at 22:18, Keir Fraser wrote:
The code that would be affected by an interface difference is
precisely that code which manipulates page tables, and so is already
broken by the different pagetable format. The only way unmodified
non-pae code could possibly be made to work is by using shadow page
tables. In that case we would hook off the call to e.g.,
do_mmu_update() very early anyway (off into shadow code). Hardly
different really from jumping in the first place at a different
hypercall function with different prototype: this latter would
arguably be cleaner and less cluttered, as well as easily allowing us
to support non-pae hypercall interface within pae xen.
I really think that creating this interface inconsistency is not
something to be worried about.
I'll repeat again, though, that I'm neutral on this. A larger
mmu_update_t and extra register argument to update_va_mapping is not
going to noticeably slow down non-pae i386.
-- Keir
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