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From a8d41b7937a34904611011ca357f8db880d42270 Mon Sep 17 00:00:00 2001
From: Martin Doucha <mdoucha@suse.cz>
Date: Mon, 25 Jul 2022 17:37:27 +0200
Subject: [PATCH] Add KVM_LD Makefile variable for building KVM payload
binaries
KVM linker needs to be configurable for cross-compiling but some
linkers don't support the linker script for wrapping arbitrary files
into linkable resource files. Allow KVM linker to be changed
independently of $LD via $KVM_LD.
Signed-off-by: Martin Doucha <mdoucha@suse.cz>
Acked-by: Richard Palethorpe <rpalethorpe@suse.com>
Upstream-Status: Backport [https://github.com/linux-test-project/ltp/commit/5ef0b7892a17b64040e55e9ad62d36ebb75d33fd]
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
doc/build-system-guide.txt | 5 +++++
testcases/kernel/kvm/Makefile | 5 +++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/doc/build-system-guide.txt b/doc/build-system-guide.txt
index 166f7fb92..b8d267b4b 100644
--- a/doc/build-system-guide.txt
+++ b/doc/build-system-guide.txt
@@ -145,6 +145,11 @@ $(CPPFLAGS) : Preprocessor flags, e.g. -I arguments.
$(DEBUG_CFLAGS) : Debug flags to pass to $(CC), -g, etc.
+$(KVM_LD) : Special linker for wrapping KVM payload binaries
+ into linkable object files. Defaults to $(LD).
+ Change this variable if the KVM Makefile fails
+ to build files named *-payload.o.
+
$(LD) : The system linker (typically $(CC), but not
necessarily).
diff --git a/testcases/kernel/kvm/Makefile b/testcases/kernel/kvm/Makefile
index d67230735..31f144c26 100644
--- a/testcases/kernel/kvm/Makefile
+++ b/testcases/kernel/kvm/Makefile
@@ -11,6 +11,7 @@ GUEST_CPPFLAGS = $(CPPFLAGS) -DCOMPILE_PAYLOAD
GUEST_CFLAGS = -ffreestanding -O2 -Wall -fno-asynchronous-unwind-tables -mno-mmx -mno-sse
GUEST_LDFLAGS = -nostdlib -Wl,--build-id=none
GUEST_LDLIBS =
+KVM_LD ?= $(LD)
FILTER_OUT_MAKE_TARGETS := lib_guest lib_host lib_x86
@@ -50,11 +51,11 @@ include $(top_srcdir)/include/mk/generic_leaf_target.mk
ifdef VERBOSE
$(CC) $(GUEST_CPPFLAGS) $(GUEST_CFLAGS) $(GUEST_LDFLAGS) -o $*-payload.elf $^ $(GUEST_LDLIBS)
objcopy -O binary -j .init.boot -j .text -j .data -j .init -j .preinit_array -j .init_array --gap-fill=0 $*-payload.elf $*-payload.bin
- $(LD) -z noexecstack -r -T $(abs_srcdir)/linker/payload.lds --oformat=$(BIN_FORMAT) -o $@ $*-payload.bin
+ $(KVM_LD) -z noexecstack -r -T $(abs_srcdir)/linker/payload.lds --oformat=$(BIN_FORMAT) -o $@ $*-payload.bin
else
@$(CC) $(GUEST_CPPFLAGS) $(GUEST_CFLAGS) $(GUEST_LDFLAGS) -o $*-payload.elf $^ $(GUEST_LDLIBS)
@objcopy -O binary -j .init.boot -j .text -j .data -j .init -j .preinit_array -j .init_array --gap-fill=0 $*-payload.elf $*-payload.bin
- @$(LD) -z noexecstack -r -T $(abs_srcdir)/linker/payload.lds --oformat=$(BIN_FORMAT) -o $@ $*-payload.bin
+ @$(KVM_LD) -z noexecstack -r -T $(abs_srcdir)/linker/payload.lds --oformat=$(BIN_FORMAT) -o $@ $*-payload.bin
@echo KVM_CC $(target_rel_dir)$@
endif
@rm $*-payload.elf $*-payload.bin
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