linux-kernel - Re: [PATCH v4 14/16] KVM: selftests: Provide empty 'all' and 'clean' targets for unsupported ARCHs

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Message-ID: <29c1434a-bf33-4ab4-9df5-71fc12b4eceb@collabora.com>
Date: Thu, 28 Nov 2024 13:19:46 +0500
From: Muhammad Usama Anjum <Usama.Anjum@...labora.com>
To: Sean Christopherson <seanjc@...gle.com>, Marc Zyngier <maz@...nel.org>,
 Oliver Upton <oliver.upton@...ux.dev>, Anup Patel <anup@...infault.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Paolo Bonzini <pbonzini@...hat.com>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Janosch Frank <frankja@...ux.ibm.com>,
 Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: Usama.Anjum@...labora.com, linux-arm-kernel@...ts.infradead.org,
 kvmarm@...ts.linux.dev, kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Andrew Jones <ajones@...tanamicro.com>,
 James Houghton <jthoughton@...gle.com>
Subject: Re: [PATCH v4 14/16] KVM: selftests: Provide empty 'all' and 'clean'
 targets for unsupported ARCHs

On 11/28/24 5:55 AM, Sean Christopherson wrote:
> Provide empty targets for KVM selftests if the target architecture is
> unsupported to make it obvious which architectures are supported, and so
> that various side effects don't fail and/or do weird things, e.g. as is,
> "mkdir -p $(sort $(dir $(TEST_GEN_PROGS)))" fails due to a missing operand,
> and conversely, "$(shell mkdir -p $(sort $(OUTPUT)/$(ARCH_DIR) ..." will
> create an empty, useless directory for the unsupported architecture.
> 
> Move the guts of the Makefile to Makefile.kvm so that it's easier to see
> that the if-statement effectively guards all of KVM selftests.
> 
> Reported-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Acked-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> ---
>  tools/testing/selftests/kvm/.gitignore   |   1 +
>  tools/testing/selftests/kvm/Makefile     | 336 +----------------------
>  tools/testing/selftests/kvm/Makefile.kvm | 334 ++++++++++++++++++++++
>  3 files changed, 340 insertions(+), 331 deletions(-)
>  create mode 100644 tools/testing/selftests/kvm/Makefile.kvm
> 
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index 7f57abf936e7..1d41a046a7bf 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -9,3 +9,4 @@
>  !config
>  !settings
>  !Makefile
> +!Makefile.kvm
> \ No newline at end of file
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index c59a337cd4da..7b33464bf8cc 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -1,12 +1,9 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -include ../../../build/Build.include
> -
> -all:
> -
>  top_srcdir = ../../../..
>  include $(top_srcdir)/scripts/subarch.include
>  ARCH            ?= $(SUBARCH)
>  
> +ifeq ($(ARCH),$(filter $(ARCH),arm64 s390 riscv x86 x86_64))
>  ifeq ($(ARCH),x86)
>  	ARCH_DIR := x86_64
>  else ifeq ($(ARCH),arm64)
> @@ -17,332 +14,9 @@ else
>  	ARCH_DIR := $(ARCH)
>  endif
>  
> -LIBKVM += lib/assert.c
> -LIBKVM += lib/elf.c
> -LIBKVM += lib/guest_modes.c
> -LIBKVM += lib/io.c
> -LIBKVM += lib/kvm_util.c
> -LIBKVM += lib/memstress.c
> -LIBKVM += lib/guest_sprintf.c
> -LIBKVM += lib/rbtree.c
> -LIBKVM += lib/sparsebit.c
> -LIBKVM += lib/test_util.c
> -LIBKVM += lib/ucall_common.c
> -LIBKVM += lib/userfaultfd_util.c
> -
> -LIBKVM_STRING += lib/string_override.c
> -
> -LIBKVM_x86_64 += lib/x86_64/apic.c
> -LIBKVM_x86_64 += lib/x86_64/handlers.S
> -LIBKVM_x86_64 += lib/x86_64/hyperv.c
> -LIBKVM_x86_64 += lib/x86_64/memstress.c
> -LIBKVM_x86_64 += lib/x86_64/pmu.c
> -LIBKVM_x86_64 += lib/x86_64/processor.c
> -LIBKVM_x86_64 += lib/x86_64/sev.c
> -LIBKVM_x86_64 += lib/x86_64/svm.c
> -LIBKVM_x86_64 += lib/x86_64/ucall.c
> -LIBKVM_x86_64 += lib/x86_64/vmx.c
> -
> -LIBKVM_aarch64 += lib/aarch64/gic.c
> -LIBKVM_aarch64 += lib/aarch64/gic_v3.c
> -LIBKVM_aarch64 += lib/aarch64/gic_v3_its.c
> -LIBKVM_aarch64 += lib/aarch64/handlers.S
> -LIBKVM_aarch64 += lib/aarch64/processor.c
> -LIBKVM_aarch64 += lib/aarch64/spinlock.c
> -LIBKVM_aarch64 += lib/aarch64/ucall.c
> -LIBKVM_aarch64 += lib/aarch64/vgic.c
> -
> -LIBKVM_s390x += lib/s390x/diag318_test_handler.c
> -LIBKVM_s390x += lib/s390x/processor.c
> -LIBKVM_s390x += lib/s390x/ucall.c
> -LIBKVM_s390x += lib/s390x/facility.c
> -
> -LIBKVM_riscv += lib/riscv/handlers.S
> -LIBKVM_riscv += lib/riscv/processor.c
> -LIBKVM_riscv += lib/riscv/ucall.c
> -
> -# Non-compiled test targets
> -TEST_PROGS_x86_64 += x86_64/nx_huge_pages_test.sh
> -
> -# Compiled test targets
> -TEST_GEN_PROGS_x86_64 = x86_64/cpuid_test
> -TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test
> -TEST_GEN_PROGS_x86_64 += x86_64/dirty_log_page_splitting_test
> -TEST_GEN_PROGS_x86_64 += x86_64/feature_msrs_test
> -TEST_GEN_PROGS_x86_64 += x86_64/exit_on_emulation_failure_test
> -TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
> -TEST_GEN_PROGS_x86_64 += x86_64/hwcr_msr_test
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_evmcs
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_extended_hypercalls
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_ipi
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test
> -TEST_GEN_PROGS_x86_64 += x86_64/hyperv_tlb_flush
> -TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test
> -TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test
> -TEST_GEN_PROGS_x86_64 += x86_64/monitor_mwait_test
> -TEST_GEN_PROGS_x86_64 += x86_64/nested_exceptions_test
> -TEST_GEN_PROGS_x86_64 += x86_64/platform_info_test
> -TEST_GEN_PROGS_x86_64 += x86_64/pmu_counters_test
> -TEST_GEN_PROGS_x86_64 += x86_64/pmu_event_filter_test
> -TEST_GEN_PROGS_x86_64 += x86_64/private_mem_conversions_test
> -TEST_GEN_PROGS_x86_64 += x86_64/private_mem_kvm_exits_test
> -TEST_GEN_PROGS_x86_64 += x86_64/set_boot_cpu_id
> -TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test
> -TEST_GEN_PROGS_x86_64 += x86_64/smaller_maxphyaddr_emulation_test
> -TEST_GEN_PROGS_x86_64 += x86_64/smm_test
> -TEST_GEN_PROGS_x86_64 += x86_64/state_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
> -TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
> -TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
> -TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
> -TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
> -TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
> -TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
> -TEST_GEN_PROGS_x86_64 += x86_64/ucna_injection_test
> -TEST_GEN_PROGS_x86_64 += x86_64/userspace_io_test
> -TEST_GEN_PROGS_x86_64 += x86_64/userspace_msr_exit_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_apic_access_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_exception_with_invalid_guest_state
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_msrs_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_invalid_nested_guest_state
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_nested_tsc_scaling_test
> -TEST_GEN_PROGS_x86_64 += x86_64/apic_bus_clock_test
> -TEST_GEN_PROGS_x86_64 += x86_64/xapic_ipi_test
> -TEST_GEN_PROGS_x86_64 += x86_64/xapic_state_test
> -TEST_GEN_PROGS_x86_64 += x86_64/xcr0_cpuid_test
> -TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
> -TEST_GEN_PROGS_x86_64 += x86_64/debug_regs
> -TEST_GEN_PROGS_x86_64 += x86_64/tsc_msrs_test
> -TEST_GEN_PROGS_x86_64 += x86_64/vmx_pmu_caps_test
> -TEST_GEN_PROGS_x86_64 += x86_64/xen_shinfo_test
> -TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test
> -TEST_GEN_PROGS_x86_64 += x86_64/sev_init2_tests
> -TEST_GEN_PROGS_x86_64 += x86_64/sev_migrate_tests
> -TEST_GEN_PROGS_x86_64 += x86_64/sev_smoke_test
> -TEST_GEN_PROGS_x86_64 += x86_64/amx_test
> -TEST_GEN_PROGS_x86_64 += x86_64/max_vcpuid_cap_test
> -TEST_GEN_PROGS_x86_64 += x86_64/triple_fault_event_test
> -TEST_GEN_PROGS_x86_64 += x86_64/recalc_apic_map_test
> -TEST_GEN_PROGS_x86_64 += access_tracking_perf_test
> -TEST_GEN_PROGS_x86_64 += coalesced_io_test
> -TEST_GEN_PROGS_x86_64 += demand_paging_test
> -TEST_GEN_PROGS_x86_64 += dirty_log_test
> -TEST_GEN_PROGS_x86_64 += dirty_log_perf_test
> -TEST_GEN_PROGS_x86_64 += guest_memfd_test
> -TEST_GEN_PROGS_x86_64 += guest_print_test
> -TEST_GEN_PROGS_x86_64 += hardware_disable_test
> -TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
> -TEST_GEN_PROGS_x86_64 += kvm_page_table_test
> -TEST_GEN_PROGS_x86_64 += mmu_stress_test
> -TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
> -TEST_GEN_PROGS_x86_64 += memslot_perf_test
> -TEST_GEN_PROGS_x86_64 += rseq_test
> -TEST_GEN_PROGS_x86_64 += set_memory_region_test
> -TEST_GEN_PROGS_x86_64 += steal_time
> -TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
> -TEST_GEN_PROGS_x86_64 += system_counter_offset_test
> -TEST_GEN_PROGS_x86_64 += pre_fault_memory_test
> -
> -# Compiled outputs used by test targets
> -TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test
> -
> -TEST_GEN_PROGS_aarch64 += aarch64/aarch32_id_regs
> -TEST_GEN_PROGS_aarch64 += aarch64/arch_timer_edge_cases
> -TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
> -TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
> -TEST_GEN_PROGS_aarch64 += aarch64/mmio_abort
> -TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test
> -TEST_GEN_PROGS_aarch64 += aarch64/psci_test
> -TEST_GEN_PROGS_aarch64 += aarch64/set_id_regs
> -TEST_GEN_PROGS_aarch64 += aarch64/smccc_filter
> -TEST_GEN_PROGS_aarch64 += aarch64/vcpu_width_config
> -TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
> -TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
> -TEST_GEN_PROGS_aarch64 += aarch64/vgic_lpi_stress
> -TEST_GEN_PROGS_aarch64 += aarch64/vpmu_counter_access
> -TEST_GEN_PROGS_aarch64 += aarch64/no-vgic-v3
> -TEST_GEN_PROGS_aarch64 += access_tracking_perf_test
> -TEST_GEN_PROGS_aarch64 += arch_timer
> -TEST_GEN_PROGS_aarch64 += coalesced_io_test
> -TEST_GEN_PROGS_aarch64 += demand_paging_test
> -TEST_GEN_PROGS_aarch64 += dirty_log_test
> -TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
> -TEST_GEN_PROGS_aarch64 += guest_print_test
> -TEST_GEN_PROGS_aarch64 += get-reg-list
> -TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
> -TEST_GEN_PROGS_aarch64 += kvm_page_table_test
> -TEST_GEN_PROGS_aarch64 += memslot_modification_stress_test
> -TEST_GEN_PROGS_aarch64 += memslot_perf_test
> -TEST_GEN_PROGS_aarch64 += mmu_stress_test
> -TEST_GEN_PROGS_aarch64 += rseq_test
> -TEST_GEN_PROGS_aarch64 += set_memory_region_test
> -TEST_GEN_PROGS_aarch64 += steal_time
> -TEST_GEN_PROGS_aarch64 += kvm_binary_stats_test
> -
> -TEST_GEN_PROGS_s390x = s390x/memop
> -TEST_GEN_PROGS_s390x += s390x/resets
> -TEST_GEN_PROGS_s390x += s390x/sync_regs_test
> -TEST_GEN_PROGS_s390x += s390x/tprot
> -TEST_GEN_PROGS_s390x += s390x/cmma_test
> -TEST_GEN_PROGS_s390x += s390x/debug_test
> -TEST_GEN_PROGS_s390x += s390x/cpumodel_subfuncs_test
> -TEST_GEN_PROGS_s390x += s390x/shared_zeropage_test
> -TEST_GEN_PROGS_s390x += s390x/ucontrol_test
> -TEST_GEN_PROGS_s390x += demand_paging_test
> -TEST_GEN_PROGS_s390x += dirty_log_test
> -TEST_GEN_PROGS_s390x += guest_print_test
> -TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
> -TEST_GEN_PROGS_s390x += kvm_page_table_test
> -TEST_GEN_PROGS_s390x += rseq_test
> -TEST_GEN_PROGS_s390x += set_memory_region_test
> -TEST_GEN_PROGS_s390x += kvm_binary_stats_test
> -
> -TEST_GEN_PROGS_riscv += riscv/sbi_pmu_test
> -TEST_GEN_PROGS_riscv += riscv/ebreak_test
> -TEST_GEN_PROGS_riscv += arch_timer
> -TEST_GEN_PROGS_riscv += coalesced_io_test
> -TEST_GEN_PROGS_riscv += demand_paging_test
> -TEST_GEN_PROGS_riscv += dirty_log_test
> -TEST_GEN_PROGS_riscv += get-reg-list
> -TEST_GEN_PROGS_riscv += guest_print_test
> -TEST_GEN_PROGS_riscv += kvm_binary_stats_test
> -TEST_GEN_PROGS_riscv += kvm_create_max_vcpus
> -TEST_GEN_PROGS_riscv += kvm_page_table_test
> -TEST_GEN_PROGS_riscv += set_memory_region_test
> -TEST_GEN_PROGS_riscv += steal_time
> -
> -SPLIT_TESTS += arch_timer
> -SPLIT_TESTS += get-reg-list
> -
> -TEST_PROGS += $(TEST_PROGS_$(ARCH_DIR))
> -TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(ARCH_DIR))
> -TEST_GEN_PROGS_EXTENDED += $(TEST_GEN_PROGS_EXTENDED_$(ARCH_DIR))
> -LIBKVM += $(LIBKVM_$(ARCH_DIR))
> -
> -OVERRIDE_TARGETS = 1
> -
> -# lib.mak defines $(OUTPUT), prepends $(OUTPUT)/ to $(TEST_GEN_PROGS), and most
> -# importantly defines, i.e. overwrites, $(CC) (unless `make -e` or `make CC=`,
> -# which causes the environment variable to override the makefile).
> -include ../lib.mk
> -
> -INSTALL_HDR_PATH = $(top_srcdir)/usr
> -LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/
> -LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include
> -ifeq ($(ARCH),x86_64)
> -LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/x86/include
> +include Makefile.kvm
>  else
> -LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
> +# Empty targets for unsupported architectures
> +all:
> +clean:
>  endif
> -CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
> -	-Wno-gnu-variable-sized-type-not-at-end -MD -MP -DCONFIG_64BIT \
> -	-fno-builtin-memcmp -fno-builtin-memcpy \
> -	-fno-builtin-memset -fno-builtin-strnlen \
> -	-fno-stack-protector -fno-PIE -fno-strict-aliasing \
> -	-I$(LINUX_TOOL_INCLUDE) -I$(LINUX_TOOL_ARCH_INCLUDE) \
> -	-I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(ARCH_DIR) \
> -	-I ../rseq -I.. $(EXTRA_CFLAGS) $(KHDR_INCLUDES)
> -ifeq ($(ARCH),s390)
> -	CFLAGS += -march=z10
> -endif
> -ifeq ($(ARCH),x86)
> -ifeq ($(shell echo "void foo(void) { }" | $(CC) -march=x86-64-v2 -x c - -c -o /dev/null 2>/dev/null; echo "$$?"),0)
> -	CFLAGS += -march=x86-64-v2
> -endif
> -endif
> -ifeq ($(ARCH),arm64)
> -tools_dir := $(top_srcdir)/tools
> -arm64_tools_dir := $(tools_dir)/arch/arm64/tools/
> -
> -ifneq ($(abs_objdir),)
> -arm64_hdr_outdir := $(abs_objdir)/tools/
> -else
> -arm64_hdr_outdir := $(tools_dir)/
> -endif
> -
> -GEN_HDRS := $(arm64_hdr_outdir)arch/arm64/include/generated/
> -CFLAGS += -I$(GEN_HDRS)
> -
> -$(GEN_HDRS): $(wildcard $(arm64_tools_dir)/*)
> -	$(MAKE) -C $(arm64_tools_dir) OUTPUT=$(arm64_hdr_outdir)
> -endif
> -
> -no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \
> -        $(CC) -Werror $(CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
> -
> -# On s390, build the testcases KVM-enabled
> -pgste-option = $(call try-run, echo 'int main(void) { return 0; }' | \
> -	$(CC) -Werror -Wl$(comma)--s390-pgste -x c - -o "$$TMP",-Wl$(comma)--s390-pgste)
> -
> -LDLIBS += -ldl
> -LDFLAGS += -pthread $(no-pie-option) $(pgste-option)
> -
> -LIBKVM_C := $(filter %.c,$(LIBKVM))
> -LIBKVM_S := $(filter %.S,$(LIBKVM))
> -LIBKVM_C_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_C))
> -LIBKVM_S_OBJ := $(patsubst %.S, $(OUTPUT)/%.o, $(LIBKVM_S))
> -LIBKVM_STRING_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_STRING))
> -LIBKVM_OBJS = $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ) $(LIBKVM_STRING_OBJ)
> -SPLIT_TEST_GEN_PROGS := $(patsubst %, $(OUTPUT)/%, $(SPLIT_TESTS))
> -SPLIT_TEST_GEN_OBJ := $(patsubst %, $(OUTPUT)/$(ARCH_DIR)/%.o, $(SPLIT_TESTS))
> -
> -TEST_GEN_OBJ = $(patsubst %, %.o, $(TEST_GEN_PROGS))
> -TEST_GEN_OBJ += $(patsubst %, %.o, $(TEST_GEN_PROGS_EXTENDED))
> -TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_OBJ))
> -TEST_DEP_FILES += $(patsubst %.o, %.d, $(LIBKVM_OBJS))
> -TEST_DEP_FILES += $(patsubst %.o, %.d, $(SPLIT_TEST_GEN_OBJ))
> --include $(TEST_DEP_FILES)
> -
> -$(shell mkdir -p $(sort $(OUTPUT)/$(ARCH_DIR) $(dir $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ))))
> -
> -$(filter-out $(SPLIT_TEST_GEN_PROGS), $(TEST_GEN_PROGS)) \
> -$(TEST_GEN_PROGS_EXTENDED): %: %.o
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIBKVM_OBJS) $(LDLIBS) -o $@
> -$(TEST_GEN_OBJ): $(OUTPUT)/%.o: %.c
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> -
> -$(SPLIT_TEST_GEN_PROGS): $(OUTPUT)/%: $(OUTPUT)/%.o $(OUTPUT)/$(ARCH_DIR)/%.o
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) -o $@
> -$(SPLIT_TEST_GEN_OBJ): $(OUTPUT)/$(ARCH_DIR)/%.o: $(ARCH_DIR)/%.c
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> -
> -EXTRA_CLEAN += $(GEN_HDRS) \
> -	       $(LIBKVM_OBJS) \
> -	       $(SPLIT_TEST_GEN_OBJ) \
> -	       $(TEST_DEP_FILES) \
> -	       $(TEST_GEN_OBJ) \
> -	       cscope.*
> -
> -$(LIBKVM_C_OBJ): $(OUTPUT)/%.o: %.c $(GEN_HDRS)
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> -
> -$(LIBKVM_S_OBJ): $(OUTPUT)/%.o: %.S $(GEN_HDRS)
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> -
> -# Compile the string overrides as freestanding to prevent the compiler from
> -# generating self-referential code, e.g. without "freestanding" the compiler may
> -# "optimize" memcmp() by invoking memcmp(), thus causing infinite recursion.
> -$(LIBKVM_STRING_OBJ): $(OUTPUT)/%.o: %.c
> -	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -ffreestanding $< -o $@
> -
> -$(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS))))
> -$(SPLIT_TEST_GEN_OBJ): $(GEN_HDRS)
> -$(TEST_GEN_PROGS): $(LIBKVM_OBJS)
> -$(TEST_GEN_PROGS_EXTENDED): $(LIBKVM_OBJS)
> -$(TEST_GEN_OBJ): $(GEN_HDRS)
> -
> -cscope: include_paths = $(LINUX_TOOL_INCLUDE) $(LINUX_HDR_PATH) include lib ..
> -cscope:
> -	$(RM) cscope.*
> -	(find $(include_paths) -name '*.h' \
> -		-exec realpath --relative-base=$(PWD) {} \;; \
> -	find . -name '*.c' \
> -		-exec realpath --relative-base=$(PWD) {} \;) | sort -u > cscope.files
> -	cscope -b
> diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm
> new file mode 100644
> index 000000000000..e988a72f8c20
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/Makefile.kvm
> @@ -0,0 +1,334 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +include ../../../build/Build.include
> +
> +all:
> +
> +LIBKVM += lib/assert.c
> +LIBKVM += lib/elf.c
> +LIBKVM += lib/guest_modes.c
> +LIBKVM += lib/io.c
> +LIBKVM += lib/kvm_util.c
> +LIBKVM += lib/memstress.c
> +LIBKVM += lib/guest_sprintf.c
> +LIBKVM += lib/rbtree.c
> +LIBKVM += lib/sparsebit.c
> +LIBKVM += lib/test_util.c
> +LIBKVM += lib/ucall_common.c
> +LIBKVM += lib/userfaultfd_util.c
> +
> +LIBKVM_STRING += lib/string_override.c
> +
> +LIBKVM_x86_64 += lib/x86_64/apic.c
> +LIBKVM_x86_64 += lib/x86_64/handlers.S
> +LIBKVM_x86_64 += lib/x86_64/hyperv.c
> +LIBKVM_x86_64 += lib/x86_64/memstress.c
> +LIBKVM_x86_64 += lib/x86_64/pmu.c
> +LIBKVM_x86_64 += lib/x86_64/processor.c
> +LIBKVM_x86_64 += lib/x86_64/sev.c
> +LIBKVM_x86_64 += lib/x86_64/svm.c
> +LIBKVM_x86_64 += lib/x86_64/ucall.c
> +LIBKVM_x86_64 += lib/x86_64/vmx.c
> +
> +LIBKVM_aarch64 += lib/aarch64/gic.c
> +LIBKVM_aarch64 += lib/aarch64/gic_v3.c
> +LIBKVM_aarch64 += lib/aarch64/gic_v3_its.c
> +LIBKVM_aarch64 += lib/aarch64/handlers.S
> +LIBKVM_aarch64 += lib/aarch64/processor.c
> +LIBKVM_aarch64 += lib/aarch64/spinlock.c
> +LIBKVM_aarch64 += lib/aarch64/ucall.c
> +LIBKVM_aarch64 += lib/aarch64/vgic.c
> +
> +LIBKVM_s390x += lib/s390x/diag318_test_handler.c
> +LIBKVM_s390x += lib/s390x/processor.c
> +LIBKVM_s390x += lib/s390x/ucall.c
> +LIBKVM_s390x += lib/s390x/facility.c
> +
> +LIBKVM_riscv += lib/riscv/handlers.S
> +LIBKVM_riscv += lib/riscv/processor.c
> +LIBKVM_riscv += lib/riscv/ucall.c
> +
> +# Non-compiled test targets
> +TEST_PROGS_x86_64 += x86_64/nx_huge_pages_test.sh
> +
> +# Compiled test targets
> +TEST_GEN_PROGS_x86_64 = x86_64/cpuid_test
> +TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test
> +TEST_GEN_PROGS_x86_64 += x86_64/dirty_log_page_splitting_test
> +TEST_GEN_PROGS_x86_64 += x86_64/feature_msrs_test
> +TEST_GEN_PROGS_x86_64 += x86_64/exit_on_emulation_failure_test
> +TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
> +TEST_GEN_PROGS_x86_64 += x86_64/hwcr_msr_test
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_evmcs
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_extended_hypercalls
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_ipi
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test
> +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_tlb_flush
> +TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test
> +TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test
> +TEST_GEN_PROGS_x86_64 += x86_64/monitor_mwait_test
> +TEST_GEN_PROGS_x86_64 += x86_64/nested_exceptions_test
> +TEST_GEN_PROGS_x86_64 += x86_64/platform_info_test
> +TEST_GEN_PROGS_x86_64 += x86_64/pmu_counters_test
> +TEST_GEN_PROGS_x86_64 += x86_64/pmu_event_filter_test
> +TEST_GEN_PROGS_x86_64 += x86_64/private_mem_conversions_test
> +TEST_GEN_PROGS_x86_64 += x86_64/private_mem_kvm_exits_test
> +TEST_GEN_PROGS_x86_64 += x86_64/set_boot_cpu_id
> +TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test
> +TEST_GEN_PROGS_x86_64 += x86_64/smaller_maxphyaddr_emulation_test
> +TEST_GEN_PROGS_x86_64 += x86_64/smm_test
> +TEST_GEN_PROGS_x86_64 += x86_64/state_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
> +TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
> +TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
> +TEST_GEN_PROGS_x86_64 += x86_64/ucna_injection_test
> +TEST_GEN_PROGS_x86_64 += x86_64/userspace_io_test
> +TEST_GEN_PROGS_x86_64 += x86_64/userspace_msr_exit_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_apic_access_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_exception_with_invalid_guest_state
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_msrs_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_invalid_nested_guest_state
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_nested_tsc_scaling_test
> +TEST_GEN_PROGS_x86_64 += x86_64/apic_bus_clock_test
> +TEST_GEN_PROGS_x86_64 += x86_64/xapic_ipi_test
> +TEST_GEN_PROGS_x86_64 += x86_64/xapic_state_test
> +TEST_GEN_PROGS_x86_64 += x86_64/xcr0_cpuid_test
> +TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
> +TEST_GEN_PROGS_x86_64 += x86_64/debug_regs
> +TEST_GEN_PROGS_x86_64 += x86_64/tsc_msrs_test
> +TEST_GEN_PROGS_x86_64 += x86_64/vmx_pmu_caps_test
> +TEST_GEN_PROGS_x86_64 += x86_64/xen_shinfo_test
> +TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test
> +TEST_GEN_PROGS_x86_64 += x86_64/sev_init2_tests
> +TEST_GEN_PROGS_x86_64 += x86_64/sev_migrate_tests
> +TEST_GEN_PROGS_x86_64 += x86_64/sev_smoke_test
> +TEST_GEN_PROGS_x86_64 += x86_64/amx_test
> +TEST_GEN_PROGS_x86_64 += x86_64/max_vcpuid_cap_test
> +TEST_GEN_PROGS_x86_64 += x86_64/triple_fault_event_test
> +TEST_GEN_PROGS_x86_64 += x86_64/recalc_apic_map_test
> +TEST_GEN_PROGS_x86_64 += access_tracking_perf_test
> +TEST_GEN_PROGS_x86_64 += coalesced_io_test
> +TEST_GEN_PROGS_x86_64 += demand_paging_test
> +TEST_GEN_PROGS_x86_64 += dirty_log_test
> +TEST_GEN_PROGS_x86_64 += dirty_log_perf_test
> +TEST_GEN_PROGS_x86_64 += guest_memfd_test
> +TEST_GEN_PROGS_x86_64 += guest_print_test
> +TEST_GEN_PROGS_x86_64 += hardware_disable_test
> +TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
> +TEST_GEN_PROGS_x86_64 += kvm_page_table_test
> +TEST_GEN_PROGS_x86_64 += mmu_stress_test
> +TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
> +TEST_GEN_PROGS_x86_64 += memslot_perf_test
> +TEST_GEN_PROGS_x86_64 += rseq_test
> +TEST_GEN_PROGS_x86_64 += set_memory_region_test
> +TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
> +TEST_GEN_PROGS_x86_64 += system_counter_offset_test
> +TEST_GEN_PROGS_x86_64 += pre_fault_memory_test
> +
> +# Compiled outputs used by test targets
> +TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test
> +
> +TEST_GEN_PROGS_aarch64 += aarch64/aarch32_id_regs
> +TEST_GEN_PROGS_aarch64 += aarch64/arch_timer_edge_cases
> +TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
> +TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
> +TEST_GEN_PROGS_aarch64 += aarch64/mmio_abort
> +TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test
> +TEST_GEN_PROGS_aarch64 += aarch64/psci_test
> +TEST_GEN_PROGS_aarch64 += aarch64/set_id_regs
> +TEST_GEN_PROGS_aarch64 += aarch64/smccc_filter
> +TEST_GEN_PROGS_aarch64 += aarch64/vcpu_width_config
> +TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
> +TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
> +TEST_GEN_PROGS_aarch64 += aarch64/vgic_lpi_stress
> +TEST_GEN_PROGS_aarch64 += aarch64/vpmu_counter_access
> +TEST_GEN_PROGS_aarch64 += aarch64/no-vgic-v3
> +TEST_GEN_PROGS_aarch64 += access_tracking_perf_test
> +TEST_GEN_PROGS_aarch64 += arch_timer
> +TEST_GEN_PROGS_aarch64 += coalesced_io_test
> +TEST_GEN_PROGS_aarch64 += demand_paging_test
> +TEST_GEN_PROGS_aarch64 += dirty_log_test
> +TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
> +TEST_GEN_PROGS_aarch64 += guest_print_test
> +TEST_GEN_PROGS_aarch64 += get-reg-list
> +TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
> +TEST_GEN_PROGS_aarch64 += kvm_page_table_test
> +TEST_GEN_PROGS_aarch64 += memslot_modification_stress_test
> +TEST_GEN_PROGS_aarch64 += memslot_perf_test
> +TEST_GEN_PROGS_aarch64 += mmu_stress_test
> +TEST_GEN_PROGS_aarch64 += rseq_test
> +TEST_GEN_PROGS_aarch64 += set_memory_region_test
> +TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_binary_stats_test
> +
> +TEST_GEN_PROGS_s390x = s390x/memop
> +TEST_GEN_PROGS_s390x += s390x/resets
> +TEST_GEN_PROGS_s390x += s390x/sync_regs_test
> +TEST_GEN_PROGS_s390x += s390x/tprot
> +TEST_GEN_PROGS_s390x += s390x/cmma_test
> +TEST_GEN_PROGS_s390x += s390x/debug_test
> +TEST_GEN_PROGS_s390x += s390x/cpumodel_subfuncs_test
> +TEST_GEN_PROGS_s390x += s390x/shared_zeropage_test
> +TEST_GEN_PROGS_s390x += s390x/ucontrol_test
> +TEST_GEN_PROGS_s390x += demand_paging_test
> +TEST_GEN_PROGS_s390x += dirty_log_test
> +TEST_GEN_PROGS_s390x += guest_print_test
> +TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
> +TEST_GEN_PROGS_s390x += kvm_page_table_test
> +TEST_GEN_PROGS_s390x += rseq_test
> +TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_binary_stats_test
> +
> +TEST_GEN_PROGS_riscv += riscv/sbi_pmu_test
> +TEST_GEN_PROGS_riscv += riscv/ebreak_test
> +TEST_GEN_PROGS_riscv += arch_timer
> +TEST_GEN_PROGS_riscv += coalesced_io_test
> +TEST_GEN_PROGS_riscv += demand_paging_test
> +TEST_GEN_PROGS_riscv += dirty_log_test
> +TEST_GEN_PROGS_riscv += get-reg-list
> +TEST_GEN_PROGS_riscv += guest_print_test
> +TEST_GEN_PROGS_riscv += kvm_binary_stats_test
> +TEST_GEN_PROGS_riscv += kvm_create_max_vcpus
> +TEST_GEN_PROGS_riscv += kvm_page_table_test
> +TEST_GEN_PROGS_riscv += set_memory_region_test
> +TEST_GEN_PROGS_riscv += steal_time
> +
> +SPLIT_TESTS += arch_timer
> +SPLIT_TESTS += get-reg-list
> +
> +TEST_PROGS += $(TEST_PROGS_$(ARCH_DIR))
> +TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(ARCH_DIR))
> +TEST_GEN_PROGS_EXTENDED += $(TEST_GEN_PROGS_EXTENDED_$(ARCH_DIR))
> +LIBKVM += $(LIBKVM_$(ARCH_DIR))
> +
> +OVERRIDE_TARGETS = 1
> +
> +# lib.mak defines $(OUTPUT), prepends $(OUTPUT)/ to $(TEST_GEN_PROGS), and most
> +# importantly defines, i.e. overwrites, $(CC) (unless `make -e` or `make CC=`,
> +# which causes the environment variable to override the makefile).
> +include ../lib.mk
> +
> +INSTALL_HDR_PATH = $(top_srcdir)/usr
> +LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/
> +LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include
> +ifeq ($(ARCH),x86_64)
> +LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/x86/include
> +else
> +LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
> +endif
> +CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
> +	-Wno-gnu-variable-sized-type-not-at-end -MD -MP -DCONFIG_64BIT \
> +	-fno-builtin-memcmp -fno-builtin-memcpy \
> +	-fno-builtin-memset -fno-builtin-strnlen \
> +	-fno-stack-protector -fno-PIE -fno-strict-aliasing \
> +	-I$(LINUX_TOOL_INCLUDE) -I$(LINUX_TOOL_ARCH_INCLUDE) \
> +	-I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(ARCH_DIR) \
> +	-I ../rseq -I.. $(EXTRA_CFLAGS) $(KHDR_INCLUDES)
> +ifeq ($(ARCH),s390)
> +	CFLAGS += -march=z10
> +endif
> +ifeq ($(ARCH),x86)
> +ifeq ($(shell echo "void foo(void) { }" | $(CC) -march=x86-64-v2 -x c - -c -o /dev/null 2>/dev/null; echo "$$?"),0)
> +	CFLAGS += -march=x86-64-v2
> +endif
> +endif
> +ifeq ($(ARCH),arm64)
> +tools_dir := $(top_srcdir)/tools
> +arm64_tools_dir := $(tools_dir)/arch/arm64/tools/
> +
> +ifneq ($(abs_objdir),)
> +arm64_hdr_outdir := $(abs_objdir)/tools/
> +else
> +arm64_hdr_outdir := $(tools_dir)/
> +endif
> +
> +GEN_HDRS := $(arm64_hdr_outdir)arch/arm64/include/generated/
> +CFLAGS += -I$(GEN_HDRS)
> +
> +$(GEN_HDRS): $(wildcard $(arm64_tools_dir)/*)
> +	$(MAKE) -C $(arm64_tools_dir) OUTPUT=$(arm64_hdr_outdir)
> +endif
> +
> +no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \
> +        $(CC) -Werror $(CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
> +
> +# On s390, build the testcases KVM-enabled
> +pgste-option = $(call try-run, echo 'int main(void) { return 0; }' | \
> +	$(CC) -Werror -Wl$(comma)--s390-pgste -x c - -o "$$TMP",-Wl$(comma)--s390-pgste)
> +
> +LDLIBS += -ldl
> +LDFLAGS += -pthread $(no-pie-option) $(pgste-option)
> +
> +LIBKVM_C := $(filter %.c,$(LIBKVM))
> +LIBKVM_S := $(filter %.S,$(LIBKVM))
> +LIBKVM_C_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_C))
> +LIBKVM_S_OBJ := $(patsubst %.S, $(OUTPUT)/%.o, $(LIBKVM_S))
> +LIBKVM_STRING_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_STRING))
> +LIBKVM_OBJS = $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ) $(LIBKVM_STRING_OBJ)
> +SPLIT_TEST_GEN_PROGS := $(patsubst %, $(OUTPUT)/%, $(SPLIT_TESTS))
> +SPLIT_TEST_GEN_OBJ := $(patsubst %, $(OUTPUT)/$(ARCH_DIR)/%.o, $(SPLIT_TESTS))
> +
> +TEST_GEN_OBJ = $(patsubst %, %.o, $(TEST_GEN_PROGS))
> +TEST_GEN_OBJ += $(patsubst %, %.o, $(TEST_GEN_PROGS_EXTENDED))
> +TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_OBJ))
> +TEST_DEP_FILES += $(patsubst %.o, %.d, $(LIBKVM_OBJS))
> +TEST_DEP_FILES += $(patsubst %.o, %.d, $(SPLIT_TEST_GEN_OBJ))
> +-include $(TEST_DEP_FILES)
> +
> +$(shell mkdir -p $(sort $(OUTPUT)/$(ARCH_DIR) $(dir $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ))))
> +
> +$(filter-out $(SPLIT_TEST_GEN_PROGS), $(TEST_GEN_PROGS)) \
> +$(TEST_GEN_PROGS_EXTENDED): %: %.o
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIBKVM_OBJS) $(LDLIBS) -o $@
> +$(TEST_GEN_OBJ): $(OUTPUT)/%.o: %.c
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> +
> +$(SPLIT_TEST_GEN_PROGS): $(OUTPUT)/%: $(OUTPUT)/%.o $(OUTPUT)/$(ARCH_DIR)/%.o
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) -o $@
> +$(SPLIT_TEST_GEN_OBJ): $(OUTPUT)/$(ARCH_DIR)/%.o: $(ARCH_DIR)/%.c
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> +
> +EXTRA_CLEAN += $(GEN_HDRS) \
> +	       $(LIBKVM_OBJS) \
> +	       $(SPLIT_TEST_GEN_OBJ) \
> +	       $(TEST_DEP_FILES) \
> +	       $(TEST_GEN_OBJ) \
> +	       cscope.*
> +
> +$(LIBKVM_C_OBJ): $(OUTPUT)/%.o: %.c $(GEN_HDRS)
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> +
> +$(LIBKVM_S_OBJ): $(OUTPUT)/%.o: %.S $(GEN_HDRS)
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
> +
> +# Compile the string overrides as freestanding to prevent the compiler from
> +# generating self-referential code, e.g. without "freestanding" the compiler may
> +# "optimize" memcmp() by invoking memcmp(), thus causing infinite recursion.
> +$(LIBKVM_STRING_OBJ): $(OUTPUT)/%.o: %.c
> +	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -ffreestanding $< -o $@
> +
> +$(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS))))
> +$(SPLIT_TEST_GEN_OBJ): $(GEN_HDRS)
> +$(TEST_GEN_PROGS): $(LIBKVM_OBJS)
> +$(TEST_GEN_PROGS_EXTENDED): $(LIBKVM_OBJS)
> +$(TEST_GEN_OBJ): $(GEN_HDRS)
> +
> +cscope: include_paths = $(LINUX_TOOL_INCLUDE) $(LINUX_HDR_PATH) include lib ..
> +cscope:
> +	$(RM) cscope.*
> +	(find $(include_paths) -name '*.h' \
> +		-exec realpath --relative-base=$(PWD) {} \;; \
> +	find . -name '*.c' \
> +		-exec realpath --relative-base=$(PWD) {} \;) | sort -u > cscope.files
> +	cscope -b


-- 
BR,
Muhammad Usama Anjum