vfio/container: Implement HostIOMMUDeviceClass::realize() handler
The realize function populates the capabilities. For now only the
aw_bits caps is computed for legacy backend.
Introduce a helper function vfio_device_get_aw_bits() which calls
range_get_last_bit() to get host aw_bits and package it in
HostIOMMUDeviceCaps for query with .get_cap(). This helper will
also be used by iommufd backend.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index c4fca2d..2f62c13 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -1136,6 +1136,24 @@
vioc->pci_hot_reset = vfio_legacy_pci_hot_reset;
};
+static bool hiod_legacy_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
+ Error **errp)
+{
+ VFIODevice *vdev = opaque;
+
+ hiod->name = g_strdup(vdev->name);
+ hiod->caps.aw_bits = vfio_device_get_aw_bits(vdev);
+
+ return true;
+}
+
+static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
+{
+ HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
+
+ hioc->realize = hiod_legacy_vfio_realize;
+};
+
static const TypeInfo types[] = {
{
.name = TYPE_VFIO_IOMMU_LEGACY,
@@ -1144,6 +1162,7 @@
}, {
.name = TYPE_HOST_IOMMU_DEVICE_LEGACY_VFIO,
.parent = TYPE_HOST_IOMMU_DEVICE,
+ .class_init = hiod_legacy_vfio_class_init,
}
};
diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index 27ea26a..b14edd4 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -658,3 +658,20 @@
vbasedev->ram_block_discard_allowed = ram_discard;
}
+
+int vfio_device_get_aw_bits(VFIODevice *vdev)
+{
+ /*
+ * iova_ranges is a sorted list. For old kernels that support
+ * VFIO but not support query of iova ranges, iova_ranges is NULL,
+ * in this case HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX(64) is returned.
+ */
+ GList *l = g_list_last(vdev->bcontainer->iova_ranges);
+
+ if (l) {
+ Range *range = l->data;
+ return range_get_last_bit(range) + 1;
+ }
+
+ return HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX;
+}
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 56d1717..105b8b7 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -289,4 +289,5 @@
void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **errp);
void vfio_device_init(VFIODevice *vbasedev, int type, VFIODeviceOps *ops,
DeviceState *dev, bool ram_discard);
+int vfio_device_get_aw_bits(VFIODevice *vdev);
#endif /* HW_VFIO_VFIO_COMMON_H */