[RFC PATCH v4 05/24] vfio/common: Extract out vfio_kvm_device_[add/del]_fd

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

...which will be used by both legacy and iommufd container.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/vfio/common.c              | 50 ++++++++++++++++++++++++-----------
 include/hw/vfio/vfio-common.h |  3 +++
 2 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 67150e4575..b9d493b211 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1759,17 +1759,17 @@ void vfio_reset_handler(void *opaque)
     }
 }
 
-static void vfio_kvm_device_add_group(VFIOGroup *group)
+int vfio_kvm_device_add_fd(int fd)
 {
 #ifdef CONFIG_KVM
     struct kvm_device_attr attr = {
-        .group = KVM_DEV_VFIO_GROUP,
-        .attr = KVM_DEV_VFIO_GROUP_ADD,
-        .addr = (uint64_t)(unsigned long)&group->fd,
+        .group = KVM_DEV_VFIO_FILE,
+        .attr = KVM_DEV_VFIO_FILE_ADD,
+        .addr = (uint64_t)(unsigned long)&fd,
     };
 
     if (!kvm_enabled()) {
-        return;
+        return 0;
     }
 
     if (vfio_kvm_device_fd < 0) {
@@ -1779,37 +1779,57 @@ static void vfio_kvm_device_add_group(VFIOGroup *group)
 
         if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
             error_report("Failed to create KVM VFIO device: %m");
-            return;
+            return -ENODEV;
         }
 
         vfio_kvm_device_fd = cd.fd;
     }
 
     if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
-        error_report("Failed to add group %d to KVM VFIO device: %m",
-                     group->groupid);
+        error_report("Failed to add fd %d to KVM VFIO device: %m",
+                     fd);
+        return -errno;
     }
 #endif
+    return 0;
 }
 
-static void vfio_kvm_device_del_group(VFIOGroup *group)
+static void vfio_kvm_device_add_group(VFIOGroup *group)
+{
+    if (vfio_kvm_device_add_fd(group->fd)) {
+        error_report("Failed to add group %d to KVM VFIO device",
+                     group->groupid);
+    }
+}
+
+int vfio_kvm_device_del_fd(int fd)
 {
 #ifdef CONFIG_KVM
     struct kvm_device_attr attr = {
-        .group = KVM_DEV_VFIO_GROUP,
-        .attr = KVM_DEV_VFIO_GROUP_DEL,
-        .addr = (uint64_t)(unsigned long)&group->fd,
+        .group = KVM_DEV_VFIO_FILE,
+        .attr = KVM_DEV_VFIO_FILE_DEL,
+        .addr = (uint64_t)(unsigned long)&fd,
     };
 
     if (vfio_kvm_device_fd < 0) {
-        return;
+        return -EINVAL;
     }
 
     if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
-        error_report("Failed to remove group %d from KVM VFIO device: %m",
-                     group->groupid);
+        error_report("Failed to remove fd %d from KVM VFIO device: %m",
+                     fd);
+        return -EBADF;
     }
 #endif
+    return 0;
+}
+
+static void vfio_kvm_device_del_group(VFIOGroup *group)
+{
+    if (vfio_kvm_device_del_fd(group->fd)) {
+        error_report("Failed to remove group %d from KVM VFIO device",
+                     group->groupid);
+    }
 }
 
 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 5e376c436e..598c3ce079 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -220,6 +220,9 @@ struct vfio_device_info *vfio_get_device_info(int fd);
 int vfio_get_device(VFIOGroup *group, const char *name,
                     VFIODevice *vbasedev, Error **errp);
 
+int vfio_kvm_device_add_fd(int fd);
+int vfio_kvm_device_del_fd(int fd);
+
 extern const MemoryRegionOps vfio_region_ops;
 typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
 extern VFIOGroupList vfio_group_list;
-- 
2.34.1