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