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 early_alloc.o stub.o page_alloc.o \ 17 cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o 18obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ 19 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o 20obj-y += $(lib-objs) 21 22## 23## Build rules for compiling nVHE hyp code 24## Output of this folder is `kvm_nvhe.o`, a partially linked object 25## file containing all nVHE hyp code and data. 26## 27 28hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y)) 29obj-y := kvm_nvhe.o 30extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o 31 32# 1) Compile all source files to `.nvhe.o` object files. The file extension 33# avoids file name clashes for files shared with VHE. 34$(obj)/%.nvhe.o: $(src)/%.c FORCE 35 $(call if_changed_rule,cc_o_c) 36$(obj)/%.nvhe.o: $(src)/%.S FORCE 37 $(call if_changed_rule,as_o_S) 38 39# 2) Compile linker script. 40$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE 41 $(call if_changed_dep,cpp_lds_S) 42 43# 3) Partially link all '.nvhe.o' files and apply the linker script. 44# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. 45# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before 46# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to 47# keep the dependency on the target while avoiding an error from 48# GNU ld if the linker script is passed to it twice. 49LDFLAGS_kvm_nvhe.tmp.o := -r -T 50$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE 51 $(call if_changed,ld) 52 53# 4) Generate list of hyp code/data positions that need to be relocated at 54# runtime. Because the hypervisor is part of the kernel binary, relocations 55# produce a kernel VA. We enumerate relocations targeting hyp at build time 56# and convert the kernel VAs at those positions to hyp VAs. 57$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE 58 $(call if_changed,hyprel) 59 60# 5) Compile hyp-reloc.S and link it into the existing partially linked object. 61# The object file now contains a section with pointers to hyp positions that 62# will contain kernel VAs at runtime. These pointers have relocations on them 63# so that they get updated as the hyp object is linked into `vmlinux`. 64LDFLAGS_kvm_nvhe.rel.o := -r 65$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE 66 $(call if_changed,ld) 67 68# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. 69# Prefixes names of ELF symbols with '__kvm_nvhe_'. 70$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE 71 $(call if_changed,hypcopy) 72 73# The HYPREL command calls `gen-hyprel` to generate an assembly file with 74# a list of relocations targeting hyp code/data. 75quiet_cmd_hyprel = HYPREL $@ 76 cmd_hyprel = $(obj)/gen-hyprel $< > $@ 77 78# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names 79# to avoid clashes with VHE code/data. 80quiet_cmd_hypcopy = HYPCOPY $@ 81 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ 82 83# Remove ftrace, Shadow Call Stack, and CFI CFLAGS. 84# This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations. 85KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS)) 86 87# KVM nVHE code is run at a different exception code with a different map, so 88# compiler instrumentation that inserts callbacks or checks into the code may 89# cause crashes. Just disable it. 90GCOV_PROFILE := n 91KASAN_SANITIZE := n 92KCSAN_SANITIZE := n 93UBSAN_SANITIZE := n 94KCOV_INSTRUMENT := n 95 96# Skip objtool checking for this directory because nVHE code is compiled with 97# non-standard build rules. 98OBJECT_FILES_NON_STANDARD := y 99