With kernel v5.5, the only change so far is in the behavior of depmod. In
earlier versions, it was sufficient to copy the contents of Module.sysmvers from
the vboxdrv directory to the current directory to have the exported symbols from
vboxdrv be available to another module such as vboxnetflt, etc. With v5.5, that
no longer works.
The workaround is to pass the path of Module.sysvers to kbuild (make) in a
symbol named KBUILD_EXTRA_SYMBOLS. The patch file, which has an MIT license, is
attached. Additional changes were required in the .spec file used to build an
openSUSE RPM, and I would expect changes to be needed for the RPM or DEB build
of other distros. As these changes do not exist here as a separate patch file, I
cannot attach them; however, the meat of the inline builds need to look like this:
if [ "$module_name" = "vboxdrv" -o \
"$module_name" = "vboxguest" ] ; then
SYMBOLS=""
fi
# create build directory for specific flavor
mkdir -p modules_build_dir/$flavor
# copy sources which will be used to build vbox module in last step
cp -r $vbox_module/ modules_build_dir/$flavor/
# copy vboxdrv (for host) module symbols which are used by vboxnetflt
and vboxnetadp km's:
if [ "$module_name" = "vboxnetflt" -o \
"$module_name" = "vboxnetadp" -o \
"$module_name" = "vboxpci" ] ; then
cp $PWD/modules_build_dir/$flavor/vboxdrv/Module.symvers \
$PWD/modules_build_dir/$flavor/$module_name
SYMBOLS="$PWD/modules_build_dir/$flavor/vboxdrv/Module.symvers"
fi
# copy vboxguest (for guest) module symbols which are used by vboxsf km:
if [ "$module_name" = "vboxsf" -o \
"$module_name" = "vboxvideo" ] ; then
cp $PWD/modules_build_dir/$flavor/vboxguest/Module.symvers \
$PWD/modules_build_dir/$flavor/$module_name
SYMBOLS="$PWD/modules_build_dir/$flavor/vboxguest/Module.symvers"
fi
# build the module for the specific flavor
make -j2 -C %{_prefix}/src/linux-obj/%{_target_cpu}/$flavor \
%{?linux_make_arch} \
modules M=$PWD/modules_build_dir/$flavor/$module_name \
KBUILD_EXTRA_SYMBOLS="$SYMBOLS" V=1
Larry
Index: VirtualBox-6.0.14/src/VBox/HostDrivers/linux/Makefile
===================================================================
--- VirtualBox-6.0.14.orig/src/VBox/HostDrivers/linux/Makefile
+++ VirtualBox-6.0.14/src/VBox/HostDrivers/linux/Makefile
@@ -45,6 +45,8 @@ else # ! KERNELRELEASE
KBUILD_VERBOSE ?=
KERN_VER ?= $(shell uname -r)
+PWD ?= $(shell pwd)
+
.PHONY: all install clean check unload load vboxdrv vboxnetflt vboxnetadp \
vboxpci
@@ -64,6 +66,7 @@ vboxnetflt: vboxdrv
if [ -f vboxdrv/Module.symvers ]; then \
cp vboxdrv/Module.symvers vboxnetflt; \
fi; \
+ export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetflt/Module.symvers; \
echo "=== Building 'vboxnetflt' module ==="; \
$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetflt || exit 1; \
cp vboxnetflt/vboxnetflt.ko .; \
@@ -75,8 +78,9 @@ 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
@@ -86,6 +90,7 @@ vboxpci: vboxdrv
if [ -f vboxdrv/Module.symvers ]; then \
cp vboxdrv/Module.symvers vboxpci; \
fi; \
+ export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxpci/Module.symvers; \
echo "=== Building 'vboxpci' module ==="; \
$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxpci || exit 1; \
cp vboxpci/vboxpci.ko .; \
@@ -95,12 +100,15 @@ vboxpci: vboxdrv
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 \
+ export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxpci/Module.symvers; \
$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxpci install; \
fi
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