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 $(DISABLE_KSTACK_ERASE) 16 17hostprogs := gen-hyprel 18HOST_EXTRACFLAGS += -I$(objtree)/include 19 20lib-objs := clear_page.o copy_page.o memcpy.o memset.o 21lib-objs := $(addprefix ../../../lib/, $(lib-objs)) 22 23CFLAGS_switch.nvhe.o += -Wno-override-init 24 25hyp-obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ 26 hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \ 27 cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o stacktrace.o ffa.o 28hyp-obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ 29 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o 30hyp-obj-y += ../../../kernel/smccc-call.o 31hyp-obj-$(CONFIG_LIST_HARDENED) += list_debug.o 32hyp-obj-y += $(lib-objs) 33 34## 35## Build rules for compiling nVHE hyp code 36## Output of this folder is `kvm_nvhe.o`, a partially linked object 37## file containing all nVHE hyp code and data. 38## 39 40hyp-obj := $(patsubst %.o,%.nvhe.o,$(hyp-obj-y)) 41obj-y := kvm_nvhe.o 42targets += $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o 43 44# 1) Compile all source files to `.nvhe.o` object files. The file extension 45# avoids file name clashes for files shared with VHE. 46$(obj)/%.nvhe.o: $(src)/%.c FORCE 47 $(call if_changed_rule,cc_o_c) 48$(obj)/%.nvhe.o: $(src)/%.S FORCE 49 $(call if_changed_rule,as_o_S) 50 51# 2) Compile linker script. 52$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE 53 $(call if_changed_dep,cpp_lds_S) 54 55# 3) Partially link all '.nvhe.o' files and apply the linker script. 56# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. 57# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before 58# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to 59# keep the dependency on the target while avoiding an error from 60# GNU ld if the linker script is passed to it twice. 61LDFLAGS_kvm_nvhe.tmp.o := -r -T 62$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE 63 $(call if_changed,ld) 64 65# 4) Generate list of hyp code/data positions that need to be relocated at 66# runtime. Because the hypervisor is part of the kernel binary, relocations 67# produce a kernel VA. We enumerate relocations targeting hyp at build time 68# and convert the kernel VAs at those positions to hyp VAs. 69$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE 70 $(call if_changed,hyprel) 71 72# 5) Compile hyp-reloc.S and link it into the existing partially linked object. 73# The object file now contains a section with pointers to hyp positions that 74# will contain kernel VAs at runtime. These pointers have relocations on them 75# so that they get updated as the hyp object is linked into `vmlinux`. 76LDFLAGS_kvm_nvhe.rel.o := -r 77$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE 78 $(call if_changed,ld) 79 80# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. 81# Prefixes names of ELF symbols with '__kvm_nvhe_'. 82$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE 83 $(call if_changed,hypcopy) 84 85# The HYPREL command calls `gen-hyprel` to generate an assembly file with 86# a list of relocations targeting hyp code/data. 87quiet_cmd_hyprel = HYPREL $@ 88 cmd_hyprel = $(obj)/gen-hyprel $< > $@ 89 90# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names 91# to avoid clashes with VHE code/data. 92quiet_cmd_hypcopy = HYPCOPY $@ 93 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ 94 95# Remove ftrace and Shadow Call Stack CFLAGS. 96# This is equivalent to the 'notrace' and '__noscs' annotations. 97KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) 98# Starting from 13.0.0 llvm emits SHT_REL section '.llvm.call-graph-profile' 99# when profile optimization is applied. gen-hyprel does not support SHT_REL and 100# causes a build failure. Remove profile optimization flags. 101KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%, $(KBUILD_CFLAGS)) 102KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 103 104ifeq ($(CONFIG_UBSAN_KVM_EL2),y) 105UBSAN_SANITIZE := y 106# Always use brk and not hooks 107ccflags-y += $(CFLAGS_UBSAN_TRAP) 108endif 109