[Qemu-devel] [RFC v6 21/22] virtio-iommu: Implement set_page_size_mask

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

We implement the set_page_size_mask callback to allow the
virtio-iommu to be aware of any restrictions on the page size
mask due to an underlying HW IOMMU.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 hw/virtio/trace-events   |  1 +
 hw/virtio/virtio-iommu.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index ce718e8..1145995 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -55,3 +55,4 @@ virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_t sid)
 virtio_iommu_fill_resv_property(uint32_t devid, uint8_t subtype, uint64_t addr, uint64_t size, uint32_t flags, size_t filled) "dev= %d, subtype=%d addr=0x%"PRIx64" size=0x%"PRIx64" flags=%d filled=0x%lx"
 virtio_iommu_fill_none_property(uint32_t devid) "devid=%d"
 virtio_iommu_report_fault(uint8_t reason, uint32_t flags, uint32_t endpoint, uint64_t addr) "FAULT reason=%d flags=%d endpoint=%d address =0x%"PRIx64
+virtio_iommu_set_page_size_mask(const char *iommu_mr, uint64_t mask) "mr=%s page_size_mask=0x%"PRIx64
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index a8fabef..1a15ccc 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -837,6 +837,21 @@ unlock:
     return entry;
 }
 
+static void virtio_iommu_set_page_size_mask(IOMMUMemoryRegion *mr,
+                                            uint64_t page_size_mask)
+{
+    IOMMUDevice *sdev = container_of(mr, IOMMUDevice, iommu_mr);
+    VirtIOIOMMU *s = sdev->viommu;
+
+    s->config.page_size_mask &= page_size_mask;
+    if (!s->config.page_size_mask) {
+        error_setg(&error_fatal,
+                   "No compatible page size between guest and host iommus");
+    }
+
+    trace_virtio_iommu_set_page_size_mask(mr->parent_obj.name, page_size_mask);
+}
+
 static void virtio_iommu_get_config(VirtIODevice *vdev, uint8_t *config_data)
 {
     VirtIOIOMMU *dev = VIRTIO_IOMMU(vdev);
@@ -1027,6 +1042,7 @@ static void virtio_iommu_memory_region_class_init(ObjectClass *klass,
     IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass);
 
     imrc->translate = virtio_iommu_translate;
+    imrc->set_page_size_mask = virtio_iommu_set_page_size_mask;
 }
 
 static const TypeInfo virtio_iommu_info = {
-- 
1.9.1