Index: VirtualBox-6.1.2/src/VBox/HostDrivers/linux/Makefile
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/HostDrivers/linux/Makefile
+++ VirtualBox-6.1.2/src/VBox/HostDrivers/linux/Makefile
@@ -35,9 +35,6 @@ endif
 ifneq ($(wildcard $(CURDIR)/vboxnetadp/Makefile),)
  obj-m += vboxnetadp/
 endif
-ifneq ($(wildcard $(CURDIR)/vboxpci/Makefile),)
- obj-m += vboxpci/
-endif
 
 else # ! KERNELRELEASE
 
@@ -45,10 +42,11 @@ else # ! KERNELRELEASE
 
 KBUILD_VERBOSE ?=
 KERN_VER ?= $(shell uname -r)
-.PHONY: all install clean check unload load vboxdrv vboxnetflt vboxnetadp \
-    vboxpci
+PWD ?= $(shell pwd)
+
+.PHONY: all install clean check unload load vboxdrv vboxnetflt vboxnetadp
 
-all: vboxdrv vboxnetflt vboxnetadp vboxpci
+all: vboxdrv vboxnetflt vboxnetadp
 
 # We want to build on Linux 2.6.18 and later kernels.
 ifneq ($(filter-out 1.% 2.0.% 2.1.% 2.2.% 2.3.% 2.4.% 2.5.%,$(KERN_VER)),)
@@ -64,6 +62,7 @@ vboxnetflt: vboxdrv
 	    if [ -f vboxdrv/Module.symvers ]; then \
 	        cp vboxdrv/Module.symvers vboxnetflt; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetflt/Module.symvers; \
 	    echo "=== Building 'vboxnetflt' module ==="; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetflt || exit 1; \
 	    cp vboxnetflt/vboxnetflt.ko .; \
@@ -75,41 +74,29 @@ vboxnetadp: vboxdrv
 	    if [ -f vboxdrv/Module.symvers ]; then \
 	        cp vboxdrv/Module.symvers vboxnetadp; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetadp/Module.symvers; \
 	    echo "=== Building 'vboxnetadp' module ==="; \
-	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetadp || exit 1; \
+            $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetadp || exit 1; \
 	    cp vboxnetadp/vboxnetadp.ko .; \
 	    echo; \
 	fi
 
-vboxpci: vboxdrv
-	@if [ -d vboxpci ]; then \
-	    if [ -f vboxdrv/Module.symvers ]; then \
-	        cp vboxdrv/Module.symvers vboxpci; \
-	    fi; \
-	    echo "=== Building 'vboxpci' module ==="; \
-	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxpci || exit 1; \
-	    cp vboxpci/vboxpci.ko .; \
-	    echo; \
-	fi
-
 install:
 	@$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxdrv install
 	@if [ -d vboxnetflt ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetflt/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetflt install; \
 	fi
 	@if [ -d vboxnetadp ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetadp/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetadp install; \
 	fi
-	@if [ -d vboxpci ]; then \
-	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxpci install; \
-	fi
 
 else
 
 vboxdrv:
 vboxnetflt:
 vboxnetadp:
-vboxpci:
 install:
 
 endif
@@ -122,16 +109,13 @@ clean:
 	@if [ -d vboxnetadp ]; then \
 	    $(MAKE) -C vboxnetadp clean; \
 	fi
-	@if [ -d vboxpci ]; then \
-	    $(MAKE) -C vboxpci clean; \
-	fi
-	rm -f vboxdrv.ko vboxnetflt.ko vboxnetadp.ko vboxpci.ko
+	rm -f vboxdrv.ko vboxnetflt.ko vboxnetadp.ko
 
 check:
 	@$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxdrv check
 
 unload:
-	@for module in vboxpci vboxnetadp vboxnetflt vboxdrv; do \
+	@for module in vboxnetadp vboxnetflt vboxdrv; do \
 		if grep "^$$module " /proc/modules >/dev/null; then \
 			echo "Removing previously installed $$module module"; \
 			/sbin/rmmod $$module; \
@@ -139,7 +123,7 @@ unload:
 	done
 
 load: unload
-	@for module in vboxdrv vboxnetflt vboxnetadp vboxpci; do \
+	@for module in vboxdrv vboxnetflt vboxnetadp; do \
 		if test -f $$module.ko; then \
 			echo "Installing $$module module"; \
 			/sbin/insmod $$module.ko; \
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/Makefile
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/Makefile
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/Makefile
@@ -24,6 +24,7 @@ obj-m = vboxguest/ vboxsf/ vboxvideo/
 else # ! KERNELRELEASE
 
 KBUILD_VERBOSE =
+PWD ?= $(shell pwd)
  ifeq ($(KBUILD_VERBOSE),)
 VBOX_QUIET    := @
 VBOX_QUIET_SH := @
@@ -49,6 +50,7 @@ vboxsf: vboxguest
 	    if [ -f vboxguest/Module.symvers ]; then \
 	        cp vboxguest/Module.symvers vboxsf; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxsf/Module.symvers; \
 	    echo "=== Building 'vboxsf' module ==="; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) KBUILD_EXTRA_SYMBOLS=$(abspath vboxsf/Module.symvers) -C vboxsf || exit 1; \
 	    if [ -f vboxsf/vboxsf.ko ]; then \
@@ -64,6 +66,7 @@ vboxvideo:
 	    if [ -f vboxguest/Module.symvers ]; then \
 	        cp vboxguest/Module.symvers vboxvideo; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxvideo/Module.symvers; \
 	    echo "=== Building 'vboxvideo' module ==="; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) KBUILD_EXTRA_SYMBOLS=$(abspath vboxvideo/Module.symvers) -C vboxvideo || exit 1; \
 	    if [ -f vboxvideo/vboxvideo.ko ]; then \
@@ -77,9 +80,11 @@ vboxvideo:
 install:
 	$(VBOX_QUIET)$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxguest install
 	$(VBOX_QUIET_SH)if [ -d vboxsf ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxsf/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxsf install; \
 	fi
 	$(VBOX_QUIET_SH)if [ -d vboxvideo ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxvideo/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxvideo install; \
 	fi
 
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_drv.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/drm/vbox_drv.c
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_drv.c
@@ -35,8 +35,18 @@
 #include <linux/module.h>
 #include <linux/console.h>
 #include <linux/vt_kern.h>
+#include <linux/version.h>
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0))
+#include <drm/drm_file.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_device.h>
+#include <linux/pci.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_pci.h>
+#else
 #include <drm/drmP.h>
+#endif
 #include <drm/drm_crtc_helper.h>
 
 #include "vbox_drv.h"
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_drv.h
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/drm/vbox_drv.h
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_drv.h
@@ -103,7 +103,13 @@
 #define S64_MIN         ((s64)(-S64_MAX - 1))
 #endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0))
+#include <drm/drm_file.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_device.h>
+#else
 #include <drm/drmP.h>
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) || defined(RHEL_75)
 #include <drm/drm_encoder.h>
 #endif
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_fb.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/drm/vbox_fb.c
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_fb.c
@@ -42,7 +42,19 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 
+#include <linux/version.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0))
+#include <drm/drm_file.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_device.h>
+#include <linux/pci.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_pci.h>
+#include <drm/drm_ioctl.h>
+#define drm_compat_ioctl NULL
+#else
 #include <drm/drmP.h>
+#endif
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_mode.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/drm/vbox_mode.c
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_mode.c
@@ -45,6 +45,14 @@
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0) || defined(RHEL_81)
 #include <drm/drm_probe_helper.h>
 #endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+#include <drm/drm_fourcc.h>
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
+#include <drm/drm_vblank.h>
+#else
+#include <drm/drmP.h>
+#endif
 
 #include "VBoxVideo.h"
 
@@ -398,6 +406,13 @@ static struct drm_encoder *drm_encoder_f
 static struct drm_encoder *vbox_best_single_encoder(struct drm_connector
 						    *connector)
 {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+	struct drm_encoder *encoder;
+
+	/* There is only one encoder per connector */
+	drm_connector_for_each_possible_encoder(connector, encoder)
+		return encoder;
+#else
 	int enc_id = connector->encoder_ids[0];
 
 	/* pick the encoder ids */
@@ -410,6 +425,7 @@ static struct drm_encoder *vbox_best_sin
 #else
 		return drm_encoder_find(connector->dev, enc_id);
 #endif
+#endif
 
 	return NULL;
 }
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_ttm.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/drm/vbox_ttm.c
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_ttm.c
@@ -34,6 +34,10 @@
  */
 #include "vbox_drv.h"
 #include <drm/ttm/ttm_page_alloc.h>
+#include <linux/pci.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+#include <drm/drm_fourcc.h>
+#endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) && !defined(RHEL_72)
 #define PLACEMENT_FLAGS(placement) (placement)
@@ -102,8 +106,16 @@ static int vbox_ttm_global_init(struct v
  */
 static void vbox_ttm_global_release(struct vbox_private *vbox)
 {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+	struct ttm_bo_device *bdev = &vbox->ttm.bdev;
+#endif
 	drm_global_item_unref(&vbox->ttm.bo_global_ref.ref);
 	drm_global_item_unref(&vbox->ttm.mem_global_ref);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+	drm_vma_offset_manager_destroy(bdev->vma_manager);
+	kfree(bdev->vma_offset_manager);
+	bdev->vma_offset_manager = NULL;
+#endif
 }
 #endif
 
@@ -296,11 +308,27 @@ int vbox_mm_init(struct vbox_private *vb
 	int ret;
 	struct drm_device *dev = vbox->dev;
 	struct ttm_bo_device *bdev = &vbox->ttm.bdev;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+	struct drm_vma_offset_manager *vma_manager;
 
+	vma_manager = kzalloc(sizeof(*vma_manager), GFP_KERNEL);
+	if (!vma_manager)
+		return -ENOMEM;
+#endif
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0) && !defined(RHEL_77) && !defined(RHEL_81)
 	ret = vbox_ttm_global_init(vbox);
-	if (ret)
+	if (ret) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+		kfree(vma_manager);
+#endif
 		return ret;
+	}
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+	bdev->vma_manager = vma_manager;
+	drm_vma_offset_manager_init(bdev->vma_manager,
+				    DRM_FILE_PAGE_OFFSET_START,
+				    DRM_FILE_PAGE_OFFSET_SIZE);
 #endif
 	ret = ttm_bo_device_init(&vbox->ttm.bdev,
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0) && !defined(RHEL_77) && !defined(RHEL_81)
@@ -310,11 +338,12 @@ int vbox_mm_init(struct vbox_private *vb
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0) || defined(RHEL_71)
 				 dev->anon_inode->i_mapping,
 #endif
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-				 DRM_FILE_PAGE_OFFSET, true);
-#else
-				 true);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+				 bdev->vma_manager,
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
+				 DRM_FILE_PAGE_OFFSET,
 #endif
+				 true);
 	if (ret) {
 		DRM_ERROR("Error initialising bo driver; %d\n", ret);
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0) && !defined(RHEL_77) && !defined(RHEL_81)
Index: VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_irq.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Additions/linux/drm/vbox_irq.c
+++ VirtualBox-6.1.2/src/VBox/Additions/linux/drm/vbox_irq.c
@@ -42,6 +42,10 @@
 #include <drm/drm_probe_helper.h>
 #endif
 #include <VBoxVideo.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+#include <drm/drm_irq.h>
+#include <linux/pci.h>
+#endif
 
 static void vbox_clear_irq(void)
 {