1# SPDX-License-Identifier: GPL-2.0 2# 3# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part 4# 5 6asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS 7ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS 8 9hostprogs := gen-hyprel 10HOST_EXTRACFLAGS += -I$(objtree)/include 11 12obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ 13 hyp-main.o hyp-smp.o psci-relay.o 14obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ 15 ../fpsimd.o ../hyp-entry.o ../exception.o 16 17## 18## Build rules for compiling nVHE hyp code 19## Output of this folder is `kvm_nvhe.o`, a partially linked object 20## file containing all nVHE hyp code and data. 21## 22 23hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y)) 24obj-y := kvm_nvhe.o 25extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o 26 27# 1) Compile all source files to `.nvhe.o` object files. The file extension 28# avoids file name clashes for files shared with VHE. 29$(obj)/%.nvhe.o: $(src)/%.c FORCE 30 $(call if_changed_rule,cc_o_c) 31$(obj)/%.nvhe.o: $(src)/%.S FORCE 32 $(call if_changed_rule,as_o_S) 33 34# 2) Compile linker script. 35$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE 36 $(call if_changed_dep,cpp_lds_S) 37 38# 3) Partially link all '.nvhe.o' files and apply the linker script. 39# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. 40# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before 41# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to 42# keep the dependency on the target while avoiding an error from 43# GNU ld if the linker script is passed to it twice. 44LDFLAGS_kvm_nvhe.tmp.o := -r -T 45$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE 46 $(call if_changed,ld) 47 48# 4) Generate list of hyp code/data positions that need to be relocated at 49# runtime. Because the hypervisor is part of the kernel binary, relocations 50# produce a kernel VA. We enumerate relocations targeting hyp at build time 51# and convert the kernel VAs at those positions to hyp VAs. 52$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel 53 $(call if_changed,hyprel) 54 55# 5) Compile hyp-reloc.S and link it into the existing partially linked object. 56# The object file now contains a section with pointers to hyp positions that 57# will contain kernel VAs at runtime. These pointers have relocations on them 58# so that they get updated as the hyp object is linked into `vmlinux`. 59LDFLAGS_kvm_nvhe.rel.o := -r 60$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE 61 $(call if_changed,ld) 62 63# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. 64# Prefixes names of ELF symbols with '__kvm_nvhe_'. 65$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE 66 $(call if_changed,hypcopy) 67 68# The HYPREL command calls `gen-hyprel` to generate an assembly file with 69# a list of relocations targeting hyp code/data. 70quiet_cmd_hyprel = HYPREL $@ 71 cmd_hyprel = $(obj)/gen-hyprel $< > $@ 72 73# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names 74# to avoid clashes with VHE code/data. 75quiet_cmd_hypcopy = HYPCOPY $@ 76 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ 77 78# Remove ftrace, Shadow Call Stack, and CFI CFLAGS. 79# This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations. 80KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS)) 81 82# KVM nVHE code is run at a different exception code with a different map, so 83# compiler instrumentation that inserts callbacks or checks into the code may 84# cause crashes. Just disable it. 85GCOV_PROFILE := n 86KASAN_SANITIZE := n 87UBSAN_SANITIZE := n 88KCOV_INSTRUMENT := n 89 90# Skip objtool checking for this directory because nVHE code is compiled with 91# non-standard build rules. 92OBJECT_FILES_NON_STANDARD := y 93