[for-10.1,21/32] vfio: Move vfio_kvm_device_fd() into helpers.c

Commit Message

Cédric Le Goater March 18, 2025, 9:54 a.m. UTC

The vfio_kvm_device_add/del_fd() routines opening the VFIO pseudo
device are defined in "helpers.c". Move 'vfio_kvm_device_fd'
definition there and its declaration into "helpers.h" to reduce
exposure of VFIO internals in "hw/vfio/vfio-common.h".

Signed-off-by: Cédric Le Goater <[e-mail]>
---
 hw/vfio/helpers.h             |  2 ++
 include/hw/vfio/vfio-common.h |  1 -
 hw/vfio/common.c              | 11 -----------
 hw/vfio/helpers.c             | 11 +++++++++++
 hw/vfio/spapr.c               |  2 +-
 5 files changed, 14 insertions(+), 13 deletions(-)

Patch

diff --git a/hw/vfio/helpers.h b/hw/vfio/helpers.h
index 8ac1f13c6e2a51983f69f81072cb134ff8969c70..416b045c6aacd4b6186fc86c4e38be80cad81bbe 100644
--- a/hw/vfio/helpers.h
+++ b/hw/vfio/helpers.h
@@ -12,6 +12,8 @@ 
 #ifdef CONFIG_LINUX
 #include <linux/vfio.h>
 
+extern int vfio_kvm_device_fd;
+
 struct vfio_info_cap_header *
 vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id);
 struct vfio_info_cap_header *
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 7f1df4fc0c545ceb117ad6c090bd3f701456a70c..184a422916f62259158e8759efc473a5efb2b2f7 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -131,7 +131,6 @@  VFIODevice *vfio_get_vfio_device(Object *obj);
 typedef QLIST_HEAD(VFIODeviceList, VFIODevice) VFIODeviceList;
 extern VFIODeviceList vfio_device_list;
 extern const MemoryListener vfio_memory_listener;
-extern int vfio_kvm_device_fd;
 
 #ifdef CONFIG_LINUX
 int vfio_get_region_info(VFIODevice *vbasedev, int index,
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index e70e4c077ca27ce0d2f990d684196f2f74f6f07a..52f440c0d05fa9f781221032442b6118ef898a10 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -49,17 +49,6 @@ 
 VFIODeviceList vfio_device_list =
     QLIST_HEAD_INITIALIZER(vfio_device_list);
 
-#ifdef CONFIG_KVM
-/*
- * We have a single VFIO pseudo device per KVM VM.  Once created it lives
- * for the life of the VM.  Closing the file descriptor only drops our
- * reference to it and the device's reference to kvm.  Therefore once
- * initialized, this file descriptor is only released on QEMU exit and
- * we'll re-use it should another vfio device be attached before then.
- */
-int vfio_kvm_device_fd = -1;
-#endif
-
 /*
  * Device state interfaces
  */
diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index ffc40ff43c8b614f044d6131562e5837cd932aa5..e99d312a9f5c7462644ea3d0de2e9de38979f851 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -106,6 +106,17 @@  bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
     return true;
 }
 
+#ifdef CONFIG_KVM
+/*
+ * We have a single VFIO pseudo device per KVM VM.  Once created it lives
+ * for the life of the VM.  Closing the file descriptor only drops our
+ * reference to it and the device's reference to kvm.  Therefore once
+ * initialized, this file descriptor is only released on QEMU exit and
+ * we'll re-use it should another vfio device be attached before then.
+ */
+int vfio_kvm_device_fd = -1;
+#endif
+
 int vfio_kvm_device_add_fd(int fd, Error **errp)
 {
 #ifdef CONFIG_KVM
diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c
index 4adfd50967313d1a5c3c4033a57c37eeb3a779a7..e9c954352857ab4a437b84eeda6b5a95ce285472 100644
--- a/hw/vfio/spapr.c
+++ b/hw/vfio/spapr.c
@@ -15,13 +15,13 @@ 
 #include "system/hostmem.h"
 #include "exec/address-spaces.h"
 
-#include "hw/vfio/vfio-common.h"
 #include "hw/vfio/vfio-container.h"
 #include "hw/hw.h"
 #include "exec/ram_addr.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "trace.h"
+#include "helpers.h"
 
 typedef struct VFIOHostDMAWindow {
     hwaddr min_iova;