vfio: Add vfio_container_ioctl()

While most operations with VFIO IOMMU driver are generic and used inside
vfio.c, there are still some operations which only specific VFIO IOMMU
drivers implement. The first example of it will be reading a DMA window
start from the host.

This adds a helper which passes an ioctl request to the container's fd.

The helper will check if @req is known. For this, stub is added. This return
-1 on any requests for now.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 51 insertions, 0 deletions

diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 7437c2e..bdd6e33 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -39,6 +39,7 @@
 #include "qemu/range.h"
 #include "sysemu/kvm.h"
 #include "sysemu/sysemu.h"
+#include "hw/misc/vfio.h"
 
 /* #define DEBUG_VFIO */
 #ifdef DEBUG_VFIO
@@ -4318,3 +4319,44 @@ static void register_vfio_pci_dev_type(void)
 }
 
 type_init(register_vfio_pci_dev_type)
+
+static int vfio_container_do_ioctl(AddressSpace *as, int32_t groupid,
+                                   int req, void *param)
+{
+    VFIOGroup *group;
+    VFIOContainer *container;
+    int ret = -1;
+
+    group = vfio_get_group(groupid, as);
+    if (!group) {
+        error_report("vfio: group %d not registered", groupid);
+        return ret;
+    }
+
+    container = group->container;
+    if (group->container) {
+        ret = ioctl(container->fd, req, param);
+        if (ret < 0) {
+            error_report("vfio: failed to ioctl container: ret=%d, %s",
+                         ret, strerror(errno));
+        }
+    }
+
+    vfio_put_group(group);
+
+    return ret;
+}
+
+int vfio_container_ioctl(AddressSpace *as, int32_t groupid,
+                         int req, void *param)
+{
+    /* We allow only certain ioctls to the container */
+    switch (req) {
+    default:
+        /* Return an error on unknown requests */
+        error_report("vfio: unsupported ioctl %X", req);
+        return -1;
+    }
+
+    return vfio_container_do_ioctl(as, groupid, req, param);
+}
diff --git a/include/hw/misc/vfio.h b/include/hw/misc/vfio.h
new file mode 100644
index 0000000..0b26cd8
--- /dev/null
+++ b/include/hw/misc/vfio.h
@@ -0,0 +1,9 @@
+#ifndef VFIO_API_H
+#define VFIO_API_H
+
+#include "qemu/typedefs.h"
+
+extern int vfio_container_ioctl(AddressSpace *as, int32_t groupid,
+                                int req, void *param);
+
+#endif