It turns out that there was a hypervisor side workaround for this issue
for a while now but it was broken in xen-unstable.hg between
13392:0fd65225e4c6 (17 Jan 2007) and 15433:a5360bf18668 (28 June 2007).
The workaround is in xen/arch/x86/mm.c with the comment (line 3297 in
current xen-unstable):
/*
* If this is an upper-half write to a PAE PTE then we assume
that
* the guest has simply got the two writes the wrong way round.
We
* zap the PRESENT bit on the assumption that the bottom half
will
* be written immediately after we return to the guest.
*/
I suspect the hypervisor in Etch has the workaround but not the
breakage. If so this bug can be closed.
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