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 12lib-objs := clear_page.o copy_page.o memcpy.o memset.o 13lib-objs := $(addprefix ../../../lib/, $(lib-objs)) 14 15obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ 16 hyp-main.o hyp-smp.o psci-relay.o 17obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ 18 ../fpsimd.o ../hyp-entry.o ../exception.o 19obj-y += $(lib-objs) 20 21## 22## Build rules for compiling nVHE hyp code 23## Output of this folder is `kvm_nvhe.o`, a partially linked object 24## file containing all nVHE hyp code and data. 25## 26 27hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y)) 28obj-y := kvm_nvhe.o 29extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o 30 31# 1) Compile all source files to `.nvhe.o` object files. The file extension 32# avoids file name clashes for files shared with VHE. 33$(obj)/%.nvhe.o: $(src)/%.c FORCE 34 $(call if_changed_rule,cc_o_c) 35$(obj)/%.nvhe.o: $(src)/%.S FORCE 36 $(call if_changed_rule,as_o_S) 37 38# 2) Compile linker script. 39$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE 40 $(call if_changed_dep,cpp_lds_S) 41 42# 3) Partially link all '.nvhe.o' files and apply the linker script. 43# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. 44# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before 45# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to 46# keep the dependency on the target while avoiding an error from 47# GNU ld if the linker script is passed to it twice. 48LDFLAGS_kvm_nvhe.tmp.o := -r -T 49$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE 50 $(call if_changed,ld) 51 52# 4) Generate list of hyp code/data positions that need to be relocated at 53# runtime. Because the hypervisor is part of the kernel binary, relocations 54# produce a kernel VA. We enumerate relocations targeting hyp at build time 55# and convert the kernel VAs at those positions to hyp VAs. 56$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel 57 $(call if_changed,hyprel) 58 59# 5) Compile hyp-reloc.S and link it into the existing partially linked object. 60# The object file now contains a section with pointers to hyp positions that 61# will contain kernel VAs at runtime. These pointers have relocations on them 62# so that they get updated as the hyp object is linked into `vmlinux`. 63LDFLAGS_kvm_nvhe.rel.o := -r 64$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE 65 $(call if_changed,ld) 66 67# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. 68# Prefixes names of ELF symbols with '__kvm_nvhe_'. 69$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE 70 $(call if_changed,hypcopy) 71 72# The HYPREL command calls `gen-hyprel` to generate an assembly file with 73# a list of relocations targeting hyp code/data. 74quiet_cmd_hyprel = HYPREL $@ 75 cmd_hyprel = $(obj)/gen-hyprel $< > $@ 76 77# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names 78# to avoid clashes with VHE code/data. 79quiet_cmd_hypcopy = HYPCOPY $@ 80 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ 81 82# Remove ftrace and Shadow Call Stack CFLAGS. 83# This is equivalent to the 'notrace' and '__noscs' annotations. 84KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) 85 86# KVM nVHE code is run at a different exception code with a different map, so 87# compiler instrumentation that inserts callbacks or checks into the code may 88# cause crashes. Just disable it. 89GCOV_PROFILE := n 90KASAN_SANITIZE := n 91UBSAN_SANITIZE := n 92KCOV_INSTRUMENT := n 93 94# Skip objtool checking for this directory because nVHE code is compiled with 95# non-standard build rules. 96OBJECT_FILES_NON_STANDARD := y 97