On 21.01.2014, at 10:42, Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> wrote: > Liu Ping Fan <kernelfans@xxxxxxxxx> writes: > >> To make sure that on host, the pages marked with _PAGE_NUMA result in a fault >> when guest access them, we should force the checking when guest uses hypercall >> to setup hpte. >> >> Signed-off-by: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx> > > Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > > When we mark pte with _PAGE_NUMA we already call mmu_notifier_invalidate_range_start and > mmu_notifier_invalidate_range_end, which will mark existing guest hpte > entry as HPTE_V_ABSENT. Now we need to do that when we are inserting new > guest hpte entries. This patch does that. So what happens next? We insert a page into the HTAB without HPTE_V_VALID set, so the guest will fail to use it. If the guest does an H_READ on it it will suddenly turn to V_VALID though? I might need a crash course in the use of HPTE_V_ABSENT. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
