[V1,21/26] iommufd: change process ioctl

Commit Message

Steven Sistare Jan. 29, 2025, 2:43 p.m. UTC

Define the change process ioctl

Signed-off-by: Steve Sistare <[e-mail]>
---
 backends/iommufd.c       | 20 ++++++++++++++++++++
 backends/trace-events    |  1 +
 include/system/iommufd.h |  2 ++
 3 files changed, 23 insertions(+)

Patch

diff --git a/backends/iommufd.c b/backends/iommufd.c
index 6d29221..be5f6a3 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -73,6 +73,26 @@  static void iommufd_backend_class_init(ObjectClass *oc, void *data)
     object_class_property_add_str(oc, "fd", NULL, iommufd_backend_set_fd);
 }
 
+bool iommufd_change_process_capable(IOMMUFDBackend *be)
+{
+    struct iommu_ioas_change_process args = {.size = sizeof(args)};
+
+    return !ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args);
+}
+
+int iommufd_change_process(IOMMUFDBackend *be)
+{
+    struct iommu_ioas_change_process args = {.size = sizeof(args)};
+    int ret = ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args);
+
+    if (ret) {
+        ret = -errno;
+        error_report("IOMMU_IOAS_CHANGE_PROCESS fd %d failed: %m", be->fd);
+    }
+    trace_iommufd_change_process(be->fd, ret);
+    return ret;
+}
+
 bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp)
 {
     int fd;
diff --git a/backends/trace-events b/backends/trace-events
index f478e18..9b33dc3 100644
--- a/backends/trace-events
+++ b/backends/trace-events
@@ -7,6 +7,7 @@  dbus_vmstate_loading(const char *id) "id: %s"
 dbus_vmstate_saving(const char *id) "id: %s"
 
 # iommufd.c
+iommufd_change_process(int fd, int ret) "fd=%d (%d)"
 iommufd_backend_connect(int fd, bool owned, uint32_t users) "fd=%d owned=%d users=%d"
 iommufd_backend_disconnect(int fd, uint32_t users) "fd=%d users=%d"
 iommu_backend_set_fd(int fd) "pre-opened /dev/iommu fd=%d"
diff --git a/include/system/iommufd.h b/include/system/iommufd.h
index ac700b8..4e9c037 100644
--- a/include/system/iommufd.h
+++ b/include/system/iommufd.h
@@ -64,6 +64,8 @@  bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id,
                                       uint64_t iova, ram_addr_t size,
                                       uint64_t page_size, uint64_t *data,
                                       Error **errp);
+bool iommufd_change_process_capable(IOMMUFDBackend *be);
+int iommufd_change_process(IOMMUFDBackend *be);
 
 #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
 #endif