KVM: arm64: nvhe: Fix build with profile optimization

Bugzilla: https://bugzilla.redhat.com/2128973

commit bde971a
Author: Denis Nikitin <denik@chromium.org>
Date:   Fri Oct 14 11:45:32 2022 -0700

    KVM: arm64: nvhe: Fix build with profile optimization

    Kernel build with clang and KCFLAGS=-fprofile-sample-use=<profile> fails with:

    error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: Unexpected SHT_REL
    section ".rel.llvm.call-graph-profile"

    Starting from 13.0.0 llvm can generate SHT_REL section, see
    https://reviews.llvm.org/rGca3bdb57fa1ac98b711a735de048c12b5fdd8086.
    gen-hyprel does not support SHT_REL relocation section.

    Filter out profile use flags to fix the build with profile optimization.

    Signed-off-by: Denis Nikitin <denik@chromium.org>
    Signed-off-by: Marc Zyngier <maz@kernel.org>
    Link: https://lore.kernel.org/r/20221014184532.3153551-1-denik@chromium.org

Signed-off-by: Cornelia Huck <cohuck@redhat.com>

Author: cohuck

arch/arm64/kvm/hyp/nvhe/Makefile

@@ -89,6 +89,10 @@ quiet_cmd_hypcopy = HYPCOPY $@
 # Remove ftrace, Shadow Call Stack, and CFI CFLAGS.
 # This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations.
 KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS))
+# Starting from 13.0.0 llvm emits SHT_REL section '.llvm.call-graph-profile'
+# when profile optimization is applied. gen-hyprel does not support SHT_REL and
+# causes a build failure. Remove profile optimization flags.
+KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%, $(KBUILD_CFLAGS))
 
 # KVM nVHE code is run at a different exception code with a different map, so
 # compiler instrumentation that inserts callbacks or checks into the code may