VFIO - Virtual Function I/O

Co-Authored-By: richardg867 <540874+richardg867@users.noreply.github.com>

CMakeLists.txt

@@ -185,6 +185,7 @@ cmake_dependent_option(SIO_DETECT     "Super I/O Detection Helper"
 cmake_dependent_option(WACOM          "Wacom Input Devices"                      ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(XL24           "ATI VGA Wonder XL24 (ATI-28800-6)"        ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(NETSWITCH      "Network Switch Support"                   ON    "DEV_BRANCH"  OFF)
+cmake_dependent_option(VFIO           "Virtual Function I/O"                     ON    "DEV_BRANCH"  OFF)
 
 # Ditto but for Qt
 if(QT)

src/86box.c

@@ -107,6 +107,7 @@
 #include <86box/apm.h>
 #include <86box/acpi.h>
 #include <86box/nv/vid_nv_rivatimer.h>
+#include <86box/vfio.h>
 
 // Disable c99-designator to avoid the warnings about int ng
 #ifdef __clang__
@@ -1646,6 +1647,11 @@ pc_reset_hard_init(void)
        the chances of the SCSI controller ending up on the bridge. */
     video_voodoo_init();
 
+#if defined(USE_VFIO) && defined(__linux__)
+    /* Initialize VFIO */
+    vfio_init();
+#endif
+
     /* installs first game port if no device provides one, must be late */
     if (joystick_type[0])
         gameport_update_joystick_type(0);

src/CMakeLists.txt

@@ -103,6 +103,16 @@ if(VNC)
     endif()
 endif()
 
+if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+    if(VFIO)
+        include(CheckIncludeFile)
+        check_include_file("linux/vfio.h" VFIO_AVAILABLE)
+        if(VFIO_AVAILABLE)
+            add_compile_definitions(USE_VFIO)
+        endif()
+    endif()
+endif()
+
 if(INSTRUMENT)
     add_compile_definitions(USE_INSTRUMENT)
 endif()

src/device/CMakeLists.txt

@@ -81,6 +81,17 @@ if(ISAMEM_BRAT)
     target_compile_definitions(dev PRIVATE USE_ISAMEM_BRAT)
 endif()
 
+if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+    if(VFIO)
+        include(CheckIncludeFile)
+        check_include_file("linux/vfio.h" VFIO_AVAILABLE)
+        if(VFIO_AVAILABLE)
+            add_compile_definitions(USE_VFIO)
+            target_sources(dev PRIVATE vfio.c)
+        endif()
+    endif()
+endif()
+
 if(LASERXT)
     target_compile_definitions(dev PRIVATE USE_LASERXT)
 endif()

src/include/86box/vfio.h

@@ -0,0 +1,20 @@
+/*
+ * 86Box    A hypervisor and IBM PC system emulator that specializes in
+ *          running old operating systems and software designed for IBM
+ *          PC systems and compatibles from 1981 through fairly recent
+ *          system designs based on the PCI bus.
+ *
+ *          This file is part of the 86Box distribution.
+ *
+ *          Definitions for Virtual Function I/O PCI passthrough.
+ *
+ * Authors: RichardG, <richardg867@gmail.com>
+ *
+ *          Copyright 2021-2025 RichardG.
+ */
+#if !defined(EMU_VFIO_H) && defined(USE_VFIO)
+#    define EMU_VFIO_H
+
+extern void vfio_init(void);
+
+#endif