vfio/pci: Split out VGA setup

This could be setup later by device specific code, such as IGD
initialization.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

hw/vfio/pci.c

@@ -2054,6 +2054,52 @@ static VFIODeviceOps vfio_pci_ops = {
     .vfio_eoi = vfio_intx_eoi,
 };
 
+int vfio_populate_vga(VFIOPCIDevice *vdev)
+{
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    struct vfio_region_info *reg_info;
+    int ret;
+
+    if (vbasedev->num_regions > VFIO_PCI_VGA_REGION_INDEX) {
+        ret = vfio_get_region_info(vbasedev,
+                                   VFIO_PCI_VGA_REGION_INDEX, &reg_info);
+        if (ret) {
+            return ret;
+        }
+
+        if (!(reg_info->flags & VFIO_REGION_INFO_FLAG_READ) ||
+            !(reg_info->flags & VFIO_REGION_INFO_FLAG_WRITE) ||
+            reg_info->size < 0xbffff + 1) {
+            error_report("vfio: Unexpected VGA info, flags 0x%lx, size 0x%lx",
+                         (unsigned long)reg_info->flags,
+                         (unsigned long)reg_info->size);
+            g_free(reg_info);
+            return -EINVAL;
+        }
+
+        vdev->vga = g_new0(VFIOVGA, 1);
+
+        vdev->vga->fd_offset = reg_info->offset;
+        vdev->vga->fd = vdev->vbasedev.fd;
+
+        g_free(reg_info);
+
+        vdev->vga->region[QEMU_PCI_VGA_MEM].offset = QEMU_PCI_VGA_MEM_BASE;
+        vdev->vga->region[QEMU_PCI_VGA_MEM].nr = QEMU_PCI_VGA_MEM;
+        QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_MEM].quirks);
+
+        vdev->vga->region[QEMU_PCI_VGA_IO_LO].offset = QEMU_PCI_VGA_IO_LO_BASE;
+        vdev->vga->region[QEMU_PCI_VGA_IO_LO].nr = QEMU_PCI_VGA_IO_LO;
+        QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_IO_LO].quirks);
+
+        vdev->vga->region[QEMU_PCI_VGA_IO_HI].offset = QEMU_PCI_VGA_IO_HI_BASE;
+        vdev->vga->region[QEMU_PCI_VGA_IO_HI].nr = QEMU_PCI_VGA_IO_HI;
+        QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks);
+    }
+
+    return 0;
+}
+
 static int vfio_populate_device(VFIOPCIDevice *vdev)
 {
     VFIODevice *vbasedev = &vdev->vbasedev;
@@ -2113,45 +2159,13 @@ static int vfio_populate_device(VFIOPCIDevice *vdev)
 
     g_free(reg_info);
 
-    if ((vdev->features & VFIO_FEATURE_ENABLE_VGA) &&
-        vbasedev->num_regions > VFIO_PCI_VGA_REGION_INDEX) {
-        ret = vfio_get_region_info(vbasedev,
-                                   VFIO_PCI_VGA_REGION_INDEX, &reg_info);
+    if (vdev->features & VFIO_FEATURE_ENABLE_VGA) {
+        ret = vfio_populate_vga(vdev);
         if (ret) {
             error_report(
                 "vfio: Device does not support requested feature x-vga");
             goto error;
         }
-
-        if (!(reg_info->flags & VFIO_REGION_INFO_FLAG_READ) ||
-            !(reg_info->flags & VFIO_REGION_INFO_FLAG_WRITE) ||
-            reg_info->size < 0xbffff + 1) {
-            error_report("vfio: Unexpected VGA info, flags 0x%lx, size 0x%lx",
-                         (unsigned long)reg_info->flags,
-                         (unsigned long)reg_info->size);
-            g_free(reg_info);
-            ret = -1;
-            goto error;
-        }
-
-        vdev->vga = g_new0(VFIOVGA, 1);
-
-        vdev->vga->fd_offset = reg_info->offset;
-        vdev->vga->fd = vdev->vbasedev.fd;
-
-        g_free(reg_info);
-
-        vdev->vga->region[QEMU_PCI_VGA_MEM].offset = QEMU_PCI_VGA_MEM_BASE;
-        vdev->vga->region[QEMU_PCI_VGA_MEM].nr = QEMU_PCI_VGA_MEM;
-        QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_MEM].quirks);
-
-        vdev->vga->region[QEMU_PCI_VGA_IO_LO].offset = QEMU_PCI_VGA_IO_LO_BASE;
-        vdev->vga->region[QEMU_PCI_VGA_IO_LO].nr = QEMU_PCI_VGA_IO_LO;
-        QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_IO_LO].quirks);
-
-        vdev->vga->region[QEMU_PCI_VGA_IO_HI].offset = QEMU_PCI_VGA_IO_HI_BASE;
-        vdev->vga->region[QEMU_PCI_VGA_IO_HI].nr = QEMU_PCI_VGA_IO_HI;
-        QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks);
     }
 
     irq_info.index = VFIO_PCI_ERR_IRQ_INDEX;

hw/vfio/pci.h

@@ -157,4 +157,6 @@ void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr);
 void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr);
 void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev);
 
+int vfio_populate_vga(VFIOPCIDevice *vdev);
+
 #endif /* HW_VFIO_VFIO_PCI_H */