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 7 8# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as 9# there is no way to execute them and any such MMIO access from nVHE KVM 10# will explode instantly (Words of Marc Zyngier). So introduce a generic flag 11# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM. 12ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__ 13ccflags-y += -fno-stack-protector \ 14 -DDISABLE_BRANCH_PROFILING \ 15 $(DISABLE_STACKLEAK_PLUGIN) 16 17hostprogs := gen-hyprel 18HOST_EXTRACFLAGS += -I$(objtree)/include 19 20lib-objs := clear_page.o copy_page.o memcpy.o memset.o 21lib-objs := $(addprefix ../../../lib/, $(lib-objs)) 22 23hyp-obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ 24 hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \ 25 cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o stacktrace.o 26hyp-obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ 27 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o 28hyp-obj-$(CONFIG_DEBUG_LIST) += list_debug.o 29hyp-obj-y += $(lib-objs) 30 31## 32## Build rules for compiling nVHE hyp code 33## Output of this folder is `kvm_nvhe.o`, a partially linked object 34## file containing all nVHE hyp code and data. 35## 36 37hyp-obj := $(patsubst %.o,%.nvhe.o,$(hyp-obj-y)) 38obj-y := kvm_nvhe.o 39targets += $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o 40 41# 1) Compile all source files to `.nvhe.o` object files. The file extension 42# avoids file name clashes for files shared with VHE. 43$(obj)/%.nvhe.o: $(src)/%.c FORCE 44 $(call if_changed_rule,cc_o_c) 45$(obj)/%.nvhe.o: $(src)/%.S FORCE 46 $(call if_changed_rule,as_o_S) 47 48# 2) Compile linker script. 49$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE 50 $(call if_changed_dep,cpp_lds_S) 51 52# 3) Partially link all '.nvhe.o' files and apply the linker script. 53# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. 54# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before 55# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to 56# keep the dependency on the target while avoiding an error from 57# GNU ld if the linker script is passed to it twice. 58LDFLAGS_kvm_nvhe.tmp.o := -r -T 59$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE 60 $(call if_changed,ld) 61 62# 4) Generate list of hyp code/data positions that need to be relocated at 63# runtime. Because the hypervisor is part of the kernel binary, relocations 64# produce a kernel VA. We enumerate relocations targeting hyp at build time 65# and convert the kernel VAs at those positions to hyp VAs. 66$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE 67 $(call if_changed,hyprel) 68 69# 5) Compile hyp-reloc.S and link it into the existing partially linked object. 70# The object file now contains a section with pointers to hyp positions that 71# will contain kernel VAs at runtime. These pointers have relocations on them 72# so that they get updated as the hyp object is linked into `vmlinux`. 73LDFLAGS_kvm_nvhe.rel.o := -r 74$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE 75 $(call if_changed,ld) 76 77# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. 78# Prefixes names of ELF symbols with '__kvm_nvhe_'. 79$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE 80 $(call if_changed,hypcopy) 81 82# The HYPREL command calls `gen-hyprel` to generate an assembly file with 83# a list of relocations targeting hyp code/data. 84quiet_cmd_hyprel = HYPREL $@ 85 cmd_hyprel = $(obj)/gen-hyprel $< > $@ 86 87# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names 88# to avoid clashes with VHE code/data. 89quiet_cmd_hypcopy = HYPCOPY $@ 90 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ 91 92# Remove ftrace, Shadow Call Stack, and CFI CFLAGS. 93# This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations. 94KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS)) 95# Starting from 13.0.0 llvm emits SHT_REL section '.llvm.call-graph-profile' 96# when profile optimization is applied. gen-hyprel does not support SHT_REL and 97# causes a build failure. Remove profile optimization flags. 98KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%, $(KBUILD_CFLAGS)) 99KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 100 101# KVM nVHE code is run at a different exception code with a different map, so 102# compiler instrumentation that inserts callbacks or checks into the code may 103# cause crashes. Just disable it. 104GCOV_PROFILE := n 105KASAN_SANITIZE := n 106KCSAN_SANITIZE := n 107UBSAN_SANITIZE := n 108KCOV_INSTRUMENT := n 109 110# Skip objtool checking for this directory because nVHE code is compiled with 111# non-standard build rules. 112OBJECT_FILES_NON_STANDARD := y 113