Andrea Arcangeli wrote:
On Sun, Mar 15, 2009 at 12:35:48PM +0200, Avi Kivity wrote:
Izik pointed out that for invlpg, the guest is responsible for smp tlb
flushes, and mmu notifiers will protect against pageout.
How will mmu notifier protect against pageout if the spte is already
invalid and removed from the rmapp chain? mmu notifier will search the
rmapp chain and it'll find nothing, it'll do nothing, so then the page
will be freed under the other cpus without no ipi flushing their VT
tlbs.
I mentioned this:
I think we can fix this without taking the hit of the IPI by
- running a local invlpg()
- making need_flush a vm flag instead of a local
- clearing need_flush whenever remote tlbs are flushed
- flushing remote tlbs on an mmu_notifier call when need_flush is set
--
error compiling committee.c: too many arguments to function
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