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David Brazdil76217122020-06-25 14:14:08 +01001# SPDX-License-Identifier: GPL-2.0
2#
3# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part
4#
5
Quentin Perretbbc075e2021-02-03 14:19:31 +00006asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
Sai Prakash Ranjan451f2f12022-05-18 22:14:15 +05307
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__
Vincent Donnefort837d6322022-10-04 16:42:16 +010013ccflags-y += -fno-stack-protector \
14 -DDISABLE_BRANCH_PROFILING \
15 $(DISABLE_STACKLEAK_PLUGIN)
David Brazdil76217122020-06-25 14:14:08 +010016
David Brazdil8c49b5d2021-01-05 18:05:37 +000017hostprogs := gen-hyprel
Marc Zyngierbc937632021-01-30 13:07:51 +000018HOST_EXTRACFLAGS += -I$(objtree)/include
David Brazdil8c49b5d2021-01-05 18:05:37 +000019
Will Deacon7b4a7b52021-03-19 10:01:10 +000020lib-objs := clear_page.o copy_page.o memcpy.o memset.o
21lib-objs := $(addprefix ../../../lib/, $(lib-objs))
22
Masahiro Yamada3d5697f2022-06-13 18:20:25 +090023hyp-obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
Keir Fraser4c68d6c2022-01-31 12:40:53 +000024 hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \
Will Deacon048be5f2023-05-23 11:18:18 +010025 cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o stacktrace.o ffa.o
Masahiro Yamada3d5697f2022-06-13 18:20:25 +090026hyp-obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
Quentin Perretf320bc72021-03-19 10:01:25 +000027 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o
Marco Elveraebc7b02023-08-11 17:18:40 +020028hyp-obj-$(CONFIG_LIST_HARDENED) += list_debug.o
Masahiro Yamada3d5697f2022-06-13 18:20:25 +090029hyp-obj-y += $(lib-objs)
David Brazdil76217122020-06-25 14:14:08 +010030
David Brazdilab254642020-09-22 21:49:01 +010031##
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##
David Brazdil76217122020-06-25 14:14:08 +010036
Masahiro Yamada3d5697f2022-06-13 18:20:25 +090037hyp-obj := $(patsubst %.o,%.nvhe.o,$(hyp-obj-y))
David Brazdilab254642020-09-22 21:49:01 +010038obj-y := kvm_nvhe.o
Masahiro Yamada40c56bd2022-06-13 18:20:26 +090039targets += $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o
David Brazdilab254642020-09-22 21:49:01 +010040
41# 1) Compile all source files to `.nvhe.o` object files. The file extension
42# avoids file name clashes for files shared with VHE.
43$(obj)/%.nvhe.o: $(src)/%.c FORCE
David Brazdil76217122020-06-25 14:14:08 +010044 $(call if_changed_rule,cc_o_c)
David Brazdilab254642020-09-22 21:49:01 +010045$(obj)/%.nvhe.o: $(src)/%.S FORCE
David Brazdil76217122020-06-25 14:14:08 +010046 $(call if_changed_rule,as_o_S)
David Brazdilab254642020-09-22 21:49:01 +010047
48# 2) Compile linker script.
49$(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 $(call if_changed,ld)
61
David Brazdil8c49b5d2021-01-05 18:05:37 +000062# 4) Generate list of hyp code/data positions that need to be relocated at
63# runtime. Because the hypervisor is part of the kernel binary, relocations
64# produce a kernel VA. We enumerate relocations targeting hyp at build time
65# and convert the kernel VAs at those positions to hyp VAs.
Zenghui Yua49b50a2021-09-07 13:21:37 +080066$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE
David Brazdil8c49b5d2021-01-05 18:05:37 +000067 $(call if_changed,hyprel)
68
69# 5) Compile hyp-reloc.S and link it into the existing partially linked object.
70# The object file now contains a section with pointers to hyp positions that
71# will contain kernel VAs at runtime. These pointers have relocations on them
72# so that they get updated as the hyp object is linked into `vmlinux`.
73LDFLAGS_kvm_nvhe.rel.o := -r
74$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
75 $(call if_changed,ld)
76
77# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
David Brazdilab254642020-09-22 21:49:01 +010078# Prefixes names of ELF symbols with '__kvm_nvhe_'.
David Brazdil8c49b5d2021-01-05 18:05:37 +000079$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
David Brazdil76217122020-06-25 14:14:08 +010080 $(call if_changed,hypcopy)
81
David Brazdil8c49b5d2021-01-05 18:05:37 +000082# 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
David Brazdilbdbc0c72020-07-30 14:25:19 +010087# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
David Brazdilab254642020-09-22 21:49:01 +010088# to avoid clashes with VHE code/data.
David Brazdil76217122020-06-25 14:14:08 +010089quiet_cmd_hypcopy = HYPCOPY $@
David Brazdilab254642020-09-22 21:49:01 +010090 cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@
David Brazdilc50cb042020-06-25 14:14:19 +010091
Pierre-Clément Tosieca4ba52024-06-10 07:32:37 +010092# Remove ftrace and Shadow Call Stack CFLAGS.
93# This is equivalent to the 'notrace' and '__noscs' annotations.
94KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
Denis Nikitinbde971a2022-10-14 11:45:32 -070095# 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))
Ard Biesheuvel68c76ad2022-10-27 17:59:06 +020099KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables