intel_iommu: Skip page walking on device iotlb invalidations
Although they didn't reach the notifier because of the filtering in memory_region_notify_iommu_one, the vt-d was still splitting huge memory invalidations in chunks. Skipping it. This improves performance in case of netperf with vhost-net: * TCP_STREAM: From 1923.6Mbit/s to 2175.13Mbit/s (13%) * TCP_RR: From 8464.73 trans/s to 8932.703333 trans/s (5.5%) * UDP_RR: From 8562.08 trans/s to 9005.62/s (5.1%) * UDP_STREAM: No change observed (insignificant 0.1% improvement) Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Message-Id: <20201116165506.31315-5-eperezma@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -1478,6 +1478,10 @@ static int vtd_sync_shadow_page_table(VTDAddressSpace *vtd_as)
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VTDContextEntry ce;
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IOMMUNotifier *n;
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if (!(vtd_as->iommu.iommu_notify_flags & IOMMU_NOTIFIER_IOTLB_EVENTS)) {
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return 0;
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}
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ret = vtd_dev_to_context_entry(vtd_as->iommu_state,
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pci_bus_num(vtd_as->bus),
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vtd_as->devfn, &ce);
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