[Qemu-devel] [RFC v4 09/16] virtio-iommu: Implement translate

[Eric Auger <eric.auger@redhat.com>]

This patch implements the translate callback

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 hw/virtio/trace-events   |  1 +
 hw/virtio/virtio-iommu.c | 39 +++++++++++++++++++++++++++++++++++++--
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index da298c1..9010fbd 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -45,3 +45,4 @@ virtio_iommu_put_as(uint32_t asid) "Free asid=%d"
 virtio_iommu_unmap_left_interval(uint64_t low, uint64_t high, uint64_t next_low, uint64_t next_high) "Unmap left [0x%"PRIx64",0x%"PRIx64"], new interval=[0x%"PRIx64",0x%"PRIx64"]"
 virtio_iommu_unmap_right_interval(uint64_t low, uint64_t high, uint64_t next_low, uint64_t next_high) "Unmap right [0x%"PRIx64",0x%"PRIx64"], new interval=[0x%"PRIx64",0x%"PRIx64"]"
 virtio_iommu_unmap_inc_interval(uint64_t low, uint64_t high) "Unmap inc [0x%"PRIx64",0x%"PRIx64"]"
+virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_t sid) "0x%"PRIx64" -> 0x%"PRIx64 " for sid=%d"
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 6f1a7d1..db46a91 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -496,19 +496,54 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr,
                                             IOMMUAccessFlags flag)
 {
     IOMMUDevice *sdev = container_of(mr, IOMMUDevice, iommu_mr);
+    VirtIOIOMMU *s = sdev->viommu;
     uint32_t sid;
+    viommu_dev *dev;
+    viommu_mapping *mapping;
+    viommu_interval interval;
+
+    interval.low = addr;
+    interval.high = addr + 1;
 
     IOMMUTLBEntry entry = {
         .target_as = &address_space_memory,
         .iova = addr,
         .translated_addr = addr,
-        .addr_mask = ~(hwaddr)0,
-        .perm = IOMMU_NONE,
+        .addr_mask = (1 << ctz32(s->config.page_size_mask)) - 1,
+        .perm = flag,
     };
 
     sid = virtio_iommu_get_sid(sdev);
 
     trace_virtio_iommu_translate(mr->parent_obj.name, sid, addr, flag);
+    qemu_mutex_lock(&s->mutex);
+
+    dev = g_tree_lookup(s->devices, GUINT_TO_POINTER(sid));
+    if (!dev) {
+        /* device cannot be attached to another as */
+        printf("%s sid=%d is not known!!\n", __func__, sid);
+        goto unlock;
+    }
+
+    mapping = g_tree_lookup(dev->as->mappings, (gpointer)(&interval));
+    if (!mapping) {
+        printf("%s no mapping for 0x%"PRIx64" for sid=%d\n", __func__,
+               addr, sid);
+        goto unlock;
+    }
+
+    if (((flag & IOMMU_RO) && !(mapping->flags & VIRTIO_IOMMU_MAP_F_READ)) ||
+        ((flag & IOMMU_WO) && !(mapping->flags & VIRTIO_IOMMU_MAP_F_WRITE))) {
+        error_report("Permission error on 0x%"PRIx64"(%d): allowed=%d",
+                     addr, flag, mapping->flags);
+        entry.perm = IOMMU_NONE;
+        goto unlock;
+    }
+    entry.translated_addr = addr - mapping->virt_addr + mapping->phys_addr,
+    trace_virtio_iommu_translate_out(addr, entry.translated_addr, sid);
+
+unlock:
+    qemu_mutex_unlock(&s->mutex);
     return entry;
 }
 
-- 
2.5.5