[PATCH v4 01/12] vfio/pci: Extract mdev check into an helper

[Joao Martins <joao.m.martins@oracle.com>]

In preparation to skip initialization of the HostIOMMUDevice for mdev,
extract the checks that validate if a device is an mdev into helpers.

A vfio_set_mdev() is created, and subsystems consult VFIODevice::mdev
to check if it's mdev or not.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 include/hw/vfio/vfio-common.h |  2 ++
 hw/vfio/helpers.c             | 18 ++++++++++++++++++
 hw/vfio/pci.c                 |  9 ++-------
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index e8ddf92bb185..7419466bca92 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -116,6 +116,7 @@ typedef struct VFIODevice {
     DeviceState *dev;
     int fd;
     int type;
+    bool mdev;
     bool reset_works;
     bool needs_reset;
     bool no_mmap;
@@ -231,6 +232,7 @@ void vfio_region_exit(VFIORegion *region);
 void vfio_region_finalize(VFIORegion *region);
 void vfio_reset_handler(void *opaque);
 struct vfio_device_info *vfio_get_device_info(int fd);
+void vfio_set_mdev(VFIODevice *vbasedev);
 bool vfio_attach_device(char *name, VFIODevice *vbasedev,
                         AddressSpace *as, Error **errp);
 void vfio_detach_device(VFIODevice *vbasedev);
diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index b14edd46edc9..bace0e788a09 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -675,3 +675,21 @@ int vfio_device_get_aw_bits(VFIODevice *vdev)
 
     return HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX;
 }
+
+void vfio_set_mdev(VFIODevice *vbasedev)
+{
+    g_autofree char *tmp = NULL;
+    char *subsys;
+    bool is_mdev;
+
+    if (!vbasedev->sysfsdev) {
+        return;
+    }
+
+    tmp = g_strdup_printf("%s/subsystem", vbasedev->sysfsdev);
+    subsys = realpath(tmp, NULL);
+    is_mdev = subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
+    free(subsys);
+
+    vbasedev->mdev = is_mdev;
+}
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index e03d9f3ba546..585f23a18406 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2963,12 +2963,10 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     ERRP_GUARD();
     VFIOPCIDevice *vdev = VFIO_PCI(pdev);
     VFIODevice *vbasedev = &vdev->vbasedev;
-    char *subsys;
     int i, ret;
     bool is_mdev;
     char uuid[UUID_STR_LEN];
     g_autofree char *name = NULL;
-    g_autofree char *tmp = NULL;
 
     if (vbasedev->fd < 0 && !vbasedev->sysfsdev) {
         if (!(~vdev->host.domain || ~vdev->host.bus ||
@@ -2997,11 +2995,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
      * stays in sync with the active working set of the guest driver.  Prevent
      * the x-balloon-allowed option unless this is minimally an mdev device.
      */
-    tmp = g_strdup_printf("%s/subsystem", vbasedev->sysfsdev);
-    subsys = realpath(tmp, NULL);
-    is_mdev = subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
-    free(subsys);
-
+    vfio_set_mdev(vbasedev);
+    is_mdev = vbasedev->mdev;
     trace_vfio_mdev(vbasedev->name, is_mdev);
 
     if (vbasedev->ram_block_discard_allowed && !is_mdev) {
-- 
2.17.2