[PATCH v3 02/10] backends/iommufd: Extend iommufd_backend_get_device_info() to fetch HW capabilities

[Joao Martins]

The helper will be able to fetch vendor agnostic IOMMU capabilities
supported both by hardware and software. Right now it is only iommu dirty
tracking.

Signed-off-by: Joao Martins <joao.m.mart...@oracle.com>
---
 include/sysemu/iommufd.h | 2 +-
 backends/iommufd.c       | 4 +++-
 hw/vfio/iommufd.c        | 4 +++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index 9edfec604595..57d502a1c79a 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -49,7 +49,7 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t 
ioas_id,
                               hwaddr iova, ram_addr_t size);
 bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
                                      uint32_t *type, void *data, uint32_t len,
-                                     Error **errp);
+                                     uint64_t *caps, Error **errp);
 
 #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
 #endif
diff --git a/backends/iommufd.c b/backends/iommufd.c
index 84fefbc9ee7a..2b3d51af26d2 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -210,7 +210,7 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t 
ioas_id,
 
 bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
                                      uint32_t *type, void *data, uint32_t len,
-                                     Error **errp)
+                                     uint64_t *caps, Error **errp)
 {
     struct iommu_hw_info info = {
         .size = sizeof(info),
@@ -226,6 +226,8 @@ bool iommufd_backend_get_device_info(IOMMUFDBackend *be, 
uint32_t devid,
 
     g_assert(type);
     *type = info.out_data_type;
+    g_assert(caps);
+    *caps = info.out_capabilities;
 
     return true;
 }
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index a4d23f488b01..9cee71659b1c 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -628,11 +628,13 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice 
*hiod, void *opaque,
     union {
         struct iommu_hw_info_vtd vtd;
     } data;
+    uint64_t hw_caps;
 
     hiod->agent = opaque;
 
     if (iommufd_backend_get_device_info(vdev->iommufd, vdev->devid,
-                                         &type, &data, sizeof(data), NULL)) {
+                                        &type, &data, sizeof(data),
+                                        &hw_caps, NULL)) {
         hiod->name = g_strdup(vdev->name);
         caps->type = type;
         caps->aw_bits = vfio_device_get_aw_bits(vdev);
-- 
2.17.2