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__ 13 14hostprogs := gen-hyprel 15HOST_EXTRACFLAGS += -I$(objtree)/include 16 17lib-objs := clear_page.o copy_page.o memcpy.o memset.o 18lib-objs := $(addprefix ../../../lib/, $(lib-objs)) 19 20hyp-obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ 21 hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \ 22 cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o stacktrace.o 23hyp-obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ 24 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o 25hyp-obj-$(CONFIG_DEBUG_LIST) += list_debug.o 26hyp-obj-y += $(lib-objs) 27 28## 29## Build rules for compiling nVHE hyp code 30## Output of this folder is `kvm_nvhe.o`, a partially linked object 31## file containing all nVHE hyp code and data. 32## 33 34hyp-obj := $(patsubst %.o,%.nvhe.o,$(hyp-obj-y)) 35obj-y := kvm_nvhe.o 36targets += $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o 37 38# 1) Compile all source files to `.nvhe.o` object files. The file extension 39# avoids file name clashes for files shared with VHE. 40$(obj)/%.nvhe.o: $(src)/%.c FORCE 41 $(call if_changed_rule,cc_o_c) 42$(obj)/%.nvhe.o: $(src)/%.S FORCE 43 $(call if_changed_rule,as_o_S) 44 45# 2) Compile linker script. 46$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE 47 $(call if_changed_dep,cpp_lds_S) 48 49# 3) Partially link all '.nvhe.o' files and apply the linker script. 50# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. 51# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before 52# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to 53# keep the dependency on the target while avoiding an error from 54# GNU ld if the linker script is passed to it twice. 55LDFLAGS_kvm_nvhe.tmp.o := -r -T 56$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE 57 $(call if_changed,ld) 58 59# 4) Generate list of hyp code/data positions that need to be relocated at 60# runtime. Because the hypervisor is part of the kernel binary, relocations 61# produce a kernel VA. We enumerate relocations targeting hyp at build time 62# and convert the kernel VAs at those positions to hyp VAs. 63$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE 64 $(call if_changed,hyprel) 65 66# 5) Compile hyp-reloc.S and link it into the existing partially linked object. 67# The object file now contains a section with pointers to hyp positions that 68# will contain kernel VAs at runtime. These pointers have relocations on them 69# so that they get updated as the hyp object is linked into `vmlinux`. 70LDFLAGS_kvm_nvhe.rel.o := -r 71$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE 72 $(call if_changed,ld) 73 74# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. 75# Prefixes names of ELF symbols with '__kvm_nvhe_'. 76$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE 77 $(call if_changed,hypcopy) 78 79# The HYPREL command calls `gen-hyprel` to generate an assembly file with 80# a list of relocations targeting hyp code/data. 81quiet_cmd_hyprel = HYPREL $@ 82 cmd_hyprel = $(obj)/gen-hyprel $< > $@ 83 84# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names 85# to avoid clashes with VHE code/data. 86quiet_cmd_hypcopy = HYPCOPY $@ 87 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ 88 89# Remove ftrace, Shadow Call Stack, and CFI CFLAGS. 90# This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations. 91KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS)) 92 93# KVM nVHE code is run at a different exception code with a different map, so 94# compiler instrumentation that inserts callbacks or checks into the code may 95# cause crashes. Just disable it. 96GCOV_PROFILE := n 97KASAN_SANITIZE := n 98KCSAN_SANITIZE := n 99UBSAN_SANITIZE := n 100KCOV_INSTRUMENT := n 101 102# Skip objtool checking for this directory because nVHE code is compiled with 103# non-standard build rules. 104OBJECT_FILES_NON_STANDARD := y 105