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linux/tools/testing/selftests/x86/Makefile
Chang S. Bae bfc98dbcb3 selftests/x86/avx: Add AVX tests 
Add xstate testing specifically for those vector register states,
validating kernel's context switching and ensuring ABI compliance.
Use the established xstate testing framework.

Alternatively, this invocation could be placed directly in
xstate.c::main(). However, the current test file naming convention, which
clearly specifies the tested area, seems reasonable. Adding avx.c
considerably aligns with that convention.

The test output should be like this for ZMM_Hi256 as an example:

  $ avx_64
  ...
  [RUN]   AVX-512 ZMM_Hi256: check context switches, 10 iterations, 5 threads.
  [OK]    No incorrect case was found.
  [RUN]   AVX-512 ZMM_Hi256: inject xstate via ptrace().
  [OK]    'xfeatures' in SW reserved area was correctly written
  [OK]    xstate was correctly updated.
  [RUN]   AVX-512 ZMM_Hi256: load xstate and raise SIGUSR1
  [OK]    'magic1' is valid
  [OK]    'xfeatures' in SW reserved area is valid
  [OK]    'xfeatures' in XSAVE header is valid
  [OK]    xstate delivery was successful
  [OK]    'magic2' is valid
  [RUN]   AVX-512 ZMM_Hi256: load new xstate from sighandler and check it after sigreturn
  [OK]    xstate was restored correctly

But systems without AVX-512 will look like:
  ...
  The kernel does not support feature number: 5
  The kernel does not support feature number: 6
  The kernel does not support feature number: 7

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250226010731.2456-10-chang.seok.bae@intel.com
2025-02-26 13:05:30 +01:00

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Makefile
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# SPDX-License-Identifier: GPL-2.0
all:
include ../lib.mk
.PHONY: all all_32 all_64 warn_32bit_failure clean
UNAME_M := $(shell uname -m)
CAN_BUILD_I386 := $(shell ./check_cc.sh "$(CC)" trivial_32bit_program.c -m32)
CAN_BUILD_X86_64 := $(shell ./check_cc.sh "$(CC)" trivial_64bit_program.c)
CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh "$(CC)" trivial_program.c -no-pie)
TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt test_mremap_vdso \
check_initial_reg_state sigreturn iopl ioperm \
test_vsyscall mov_ss_trap \
syscall_arg_fault fsgsbase_restore sigaltstack
TARGETS_C_BOTHBITS += nx_stack
TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \
test_FCMOV test_FCOMI test_FISTTP \
vdso_restorer
TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip syscall_numbering \
corrupt_xstate_header amx lam test_shadow_stack avx
# Some selftests require 32bit support enabled also on 64bit systems
TARGETS_C_32BIT_NEEDED := ldt_gdt ptrace_syscall
TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY) $(TARGETS_C_32BIT_NEEDED)
TARGETS_C_64BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_64BIT_ONLY)
ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),11)
TARGETS_C_64BIT_ALL += $(TARGETS_C_32BIT_NEEDED)
endif
BINARIES_32 := $(TARGETS_C_32BIT_ALL:%=%_32)
BINARIES_64 := $(TARGETS_C_64BIT_ALL:%=%_64)
BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32))
BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))
CFLAGS := -O2 -g -std=gnu99 -pthread -Wall $(KHDR_INCLUDES)
# call32_from_64 in thunks.S uses absolute addresses.
ifeq ($(CAN_BUILD_WITH_NOPIE),1)
CFLAGS += -no-pie
ifneq ($(LLVM),)
# clang only wants to see -no-pie during linking. Here, we don't have a separate
# linking stage, so a compiler warning is unavoidable without (wastefully)
# restructuring the Makefile. Avoid this by simply disabling that warning.
CFLAGS += -Wno-unused-command-line-argument
endif
endif
define gen-target-rule-32
$(1) $(1)_32: $(OUTPUT)/$(1)_32
.PHONY: $(1) $(1)_32
endef
define gen-target-rule-64
$(1) $(1)_64: $(OUTPUT)/$(1)_64
.PHONY: $(1) $(1)_64
endef
ifeq ($(CAN_BUILD_I386),1)
all: all_32
TEST_PROGS += $(BINARIES_32)
EXTRA_CFLAGS += -DCAN_BUILD_32
$(foreach t,$(TARGETS_C_32BIT_ALL),$(eval $(call gen-target-rule-32,$(t))))
endif
ifeq ($(CAN_BUILD_X86_64),1)
all: all_64
TEST_PROGS += $(BINARIES_64)
EXTRA_CFLAGS += -DCAN_BUILD_64
$(foreach t,$(TARGETS_C_64BIT_ALL),$(eval $(call gen-target-rule-64,$(t))))
endif
all_32: $(BINARIES_32)
all_64: $(BINARIES_64)
EXTRA_CLEAN := $(BINARIES_32) $(BINARIES_64) srso
$(BINARIES_32): $(OUTPUT)/%_32: %.c helpers.h
$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $< $(EXTRA_FILES) -lrt -ldl -lm
$(BINARIES_64): $(OUTPUT)/%_64: %.c helpers.h
$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $< $(EXTRA_FILES) -lrt -ldl
# x86_64 users should be encouraged to install 32-bit libraries
ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),01)
all: warn_32bit_failure
warn_32bit_failure:
@echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
echo "environment. This will reduce test coverage of 64-bit" 2>&1; \
echo "kernels. If you are using a Debian-like distribution," 2>&1; \
echo "try:"; 2>&1; \
echo ""; \
echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
echo ""; \
echo "If you are using a Fedora-like distribution, try:"; \
echo ""; \
echo " yum install glibc-devel.*i686"; \
echo ""; \
echo "If you are using a SUSE-like distribution, try:"; \
echo ""; \
echo " zypper install gcc-32bit glibc-devel-static-32bit"; \
exit 0;
endif
# Add an additional file to the source file list for a given target, and also
# add a Makefile dependency on that same file. However, do these separately, so
# that the compiler invocation ("$(CC) file1.c file2.S") is not combined with
# the dependencies ("header3.h"), because clang, unlike gcc, will not accept
# header files as an input to the compiler invocation.
define extra-files
$(OUTPUT)/$(1): EXTRA_FILES := $(2)
$(OUTPUT)/$(1): $(2)
endef
$(eval $(call extra-files,sysret_ss_attrs_64,thunks.S))
$(eval $(call extra-files,ptrace_syscall_32,raw_syscall_helper_32.S))
$(eval $(call extra-files,test_syscall_vdso_32,thunks_32.S))
$(eval $(call extra-files,fsgsbase_restore_64,clang_helpers_64.S))
$(eval $(call extra-files,fsgsbase_restore_32,clang_helpers_32.S))
$(eval $(call extra-files,sysret_rip_64,clang_helpers_64.S))
# check_initial_reg_state is special: it needs a custom entry, and it
# needs to be static so that its interpreter doesn't destroy its initial
# state.
$(OUTPUT)/check_initial_reg_state_32: CFLAGS += -Wl,-ereal_start -static
$(OUTPUT)/check_initial_reg_state_64: CFLAGS += -Wl,-ereal_start -static
$(OUTPUT)/nx_stack_32: CFLAGS += -Wl,-z,noexecstack
$(OUTPUT)/nx_stack_64: CFLAGS += -Wl,-z,noexecstack
$(OUTPUT)/avx_64: CFLAGS += -mno-avx -mno-avx512f
$(OUTPUT)/amx_64: EXTRA_FILES += xstate.c
$(OUTPUT)/avx_64: EXTRA_FILES += xstate.c
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