# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as # there is no way to execute them and any such MMIO access from nVHE KVM # will explode instantly (Words of Marc Zyngier). So introduce a generic flag # __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM.
ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__
ccflags-y += -fno-stack-protector \
-DDISABLE_BRANCH_PROFILING \
$(DISABLE_KSTACK_ERASE)
## ## Build rules for compiling nVHE hyp code ## Output of this folder is `kvm_nvhe.o`, a partially linked object ## file containing all nVHE hyp code and data. ##
# 1) Compile all source files to `.nvhe.o` object files. The file extension # avoids file name clashes for files shared with VHE.
$(obj)/%.nvhe.o: $(src)/%.c FORCE
$(call if_changed_rule,cc_o_c)
$(obj)/%.nvhe.o: $(src)/%.S FORCE
$(call if_changed_rule,as_o_S)
# 2) Compile linker script.
$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE
$(call if_changed_dep,cpp_lds_S)
# 3) Partially link all '.nvhe.o' files and apply the linker script. # Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. # Note: The following rule assumes that the 'ld' rule puts LDFLAGS before # the list of dependencies to form '-T $(obj)/hyp.lds'. This is to # keep the dependency on the target while avoiding an error from # GNU ld if the linker script is passed to it twice.
LDFLAGS_kvm_nvhe.tmp.o := -r -T
$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
$(call if_changed,ld)
# 4) Generate list of hyp code/data positions that need to be relocated at # runtime. Because the hypervisor is part of the kernel binary, relocations # produce a kernel VA. We enumerate relocations targeting hyp at build time # and convert the kernel VAs at those positions to hyp VAs.
$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE
$(call if_changed,hyprel)
# 5) Compile hyp-reloc.S and link it into the existing partially linked object. # The object file now contains a section with pointers to hyp positions that # will contain kernel VAs at runtime. These pointers have relocations on them # so that they get updated as the hyp object is linked into `vmlinux`.
LDFLAGS_kvm_nvhe.rel.o := -r
$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
$(call if_changed,ld)
# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. # Prefixes names of ELF symbols with '__kvm_nvhe_'.
$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
$(call if_changed,hypcopy)
# The HYPREL command calls `gen-hyprel` to generate an assembly file with # a list of relocations targeting hyp code/data.
quiet_cmd_hyprel = HYPREL $@
cmd_hyprel = $(obj)/gen-hyprel $< > $@
# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names # to avoid clashes with VHE code/data.
quiet_cmd_hypcopy = HYPCOPY $@
cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@
# Remove ftrace and Shadow Call Stack CFLAGS. # This is equivalent to the 'notrace'and'__noscs' annotations.
KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(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=%, $(KBUILD_CFLAGS))
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
ifeq ($(CONFIG_UBSAN_KVM_EL2),y)
UBSAN_SANITIZE := y # Always use brk andnot hooks
ccflags-y += $(CFLAGS_UBSAN_TRAP)
endif
Messung V0.5
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