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
92UBSAN_SANITIZE	:= n
93KCOV_INSTRUMENT	:= n
94
95# Skip objtool checking for this directory because nVHE code is compiled with
96# non-standard build rules.
97OBJECT_FILES_NON_STANDARD := y
98