From 4f8a62a933a79094e44bc1b16b63bb23e62d67b4 Mon Sep 17 00:00:00 2001
From: Peter Xu <peterx@redhat.com>
Date: Fri, 18 May 2018 15:25:12 +0800
Subject: intel-iommu: only do page walk for MAP notifiers

For UNMAP-only IOMMU notifiers, we don't need to walk the page tables.
Fasten that procedure by skipping the page table walk.  That should
boost performance for UNMAP-only notifiers like vhost.

CC: QEMU Stable <qemu-stable@nongnu.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/hw/i386/intel_iommu.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'include')

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index 016e74bedb..156f35e919 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -93,6 +93,8 @@ struct VTDAddressSpace {
     IntelIOMMUState *iommu_state;
     VTDContextCacheEntry context_cache_entry;
     QLIST_ENTRY(VTDAddressSpace) next;
+    /* Superset of notifier flags that this address space has */
+    IOMMUNotifierFlag notifier_flags;
 };
 
 struct VTDBus {
-- 
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