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[PULL v2 07/16] vhost: Unbreak SMMU and virtio-iommu on dev-iotlb suppor

From: Michael S. Tsirkin
Subject: [PULL v2 07/16] vhost: Unbreak SMMU and virtio-iommu on dev-iotlb support
Date: Fri, 5 Feb 2021 10:03:49 -0500

From: Peter Xu <peterx@redhat.com>

Previous work on dev-iotlb message broke vhost on either SMMU or virtio-iommu
since dev-iotlb (or PCIe ATS) is not yet supported for those archs.

An initial idea is that we can let IOMMU to export this information to vhost so
that vhost would know whether the vIOMMU would support dev-iotlb, then vhost
can conditionally register to dev-iotlb or the old iotlb way.  We can work
based on some previous patch to introduce PCIIOMMUOps as Yi Liu proposed [1].

However it's not as easy as I thought since vhost_iommu_region_add() does not
have a PCIDevice context at all since it's completely a backend.  It seems
non-trivial to pass over a PCI device to the backend during init.  E.g. when
the IOMMU notifier registered hdev->vdev is still NULL.

To make the fix smaller and easier, this patch goes the other way to leverage
the flag_changed() hook of vIOMMUs so that SMMU and virtio-iommu can trap the
dev-iotlb registration and fail it.  Then vhost could try the fallback solution
as using UNMAP invalidation for it's translations.


Reported-by: Eric Auger <eric.auger@redhat.com>
Fixes: b68ba1ca57677acf870d5ab10579e6105c1f5338
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210204191228.187550-1-peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
 hw/arm/smmuv3.c          |  5 +++++
 hw/virtio/vhost.c        | 13 +++++++++++--
 hw/virtio/virtio-iommu.c |  5 +++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index 98b99d4fe8..bd1f97000d 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -1497,6 +1497,11 @@ static int smmuv3_notify_flag_changed(IOMMUMemoryRegion 
     SMMUv3State *s3 = sdev->smmu;
     SMMUState *s = &(s3->smmu_state);
+        error_setg(errp, "SMMUv3 does not support dev-iotlb yet");
+        return -EINVAL;
+    }
     if (new & IOMMU_NOTIFIER_MAP) {
                    "device %02x.%02x.%x requires iommu MAP notifier which is "
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 28c7d78172..6e17d631f7 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -704,6 +704,7 @@ static void vhost_iommu_region_add(MemoryListener *listener,
     Int128 end;
     int iommu_idx;
     IOMMUMemoryRegion *iommu_mr;
+    int ret;
     if (!memory_region_is_iommu(section->mr)) {
@@ -726,8 +727,16 @@ static void vhost_iommu_region_add(MemoryListener 
     iommu->iommu_offset = section->offset_within_address_space -
     iommu->hdev = dev;
-    memory_region_register_iommu_notifier(section->mr, &iommu->n,
-                                          &error_fatal);
+    ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, NULL);
+    if (ret) {
+        /*
+         * Some vIOMMUs do not support dev-iotlb yet.  If so, try to use the
+         * UNMAP legacy message
+         */
+        iommu->n.notifier_flags = IOMMU_NOTIFIER_UNMAP;
+        memory_region_register_iommu_notifier(section->mr, &iommu->n,
+                                              &error_fatal);
+    }
     QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next);
     /* TODO: can replay help performance here? */
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 6b9ef7f6b2..c2883a2f6c 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -893,6 +893,11 @@ static int 
virtio_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu_mr,
                                             IOMMUNotifierFlag new,
                                             Error **errp)
+        error_setg(errp, "Virtio-iommu does not support dev-iotlb yet");
+        return -EINVAL;
+    }
     if (old == IOMMU_NOTIFIER_NONE) {
     } else if (new == IOMMU_NOTIFIER_NONE) {

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