Marcelo Tosatti wrote:
Here's one way to make this work:
- add a hash of global pagetables, indexed by virtual address instead
of the pagetable's gfn
- invlpg checks this hash in addition to the recursive walk
We'd need to make the virtual address part of sp->role to avoid needing
to link the same page multiple times in the virtual address hash.
Humpf, yes. It seems its too expensive/complex to handle this, for such
small gain (~= 2% on AIM7 with RHEL3 guest).
Are you okay with just disabling the global pages optimization?
Definitely to plug the hole; and probably for later as well, unless
people cry out due to regressions.
Please send it in two patches: one a trivial one to disable global page
detection which can be sent to -stable as well, and a follow on which
rips out the global page machinery until (and if) we decide to
reimplement it correctly.
--
error compiling committee.c: too many arguments to function
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