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selftests/x86/apx: Add APX test

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The extended general-purpose registers for APX may contain random data,
which is currently assumed by the xstate testing framework. This allows
the testing of the new userspace feature using the common test code.

Invoke the test entry function from apx.c after enumerating the
state component and adding it to the support list

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20250416021720.12305-6-chang.seok.bae@intel.com
This commit is contained in:
Chang S. Bae 2025-04-15 19:16:55 -07:00 committed by Ingo Molnar
parent 50c5b071e2
commit ab6f87ddd0
4 changed files with 16 additions and 2 deletions
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3
tools/testing/selftests/x86/Makefile
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@ -19,7 +19,7 @@ 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
corrupt_xstate_header amx lam test_shadow_stack avx apx
# Some selftests require 32bit support enabled also on 64bit systems
TARGETS_C_32BIT_NEEDED := ldt_gdt ptrace_syscall
@ -136,3 +136,4 @@ $(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
$(OUTPUT)/apx_64: EXTRA_FILES += xstate.c

10
tools/testing/selftests/x86/apx.c Normal file
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@ -0,0 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include "xstate.h"
int main(void)
{
test_xstate(XFEATURE_APX);
}

3
tools/testing/selftests/x86/xstate.c
View File

@ -31,7 +31,8 @@
(1 << XFEATURE_OPMASK) | \
(1 << XFEATURE_ZMM_Hi256) | \
(1 << XFEATURE_Hi16_ZMM) | \
(1 << XFEATURE_XTILEDATA))
(1 << XFEATURE_XTILEDATA) | \
(1 << XFEATURE_APX))
static inline uint64_t xgetbv(uint32_t index)
{

2
tools/testing/selftests/x86/xstate.h
View File

@ -33,6 +33,7 @@ enum xfeature {
XFEATURE_RSRVD_COMP_16,
XFEATURE_XTILECFG,
XFEATURE_XTILEDATA,
XFEATURE_APX,
XFEATURE_MAX,
};
@ -59,6 +60,7 @@ static const char *xfeature_names[] =
"unknown xstate feature",
"AMX Tile config",
"AMX Tile data",
"APX registers",
"unknown xstate feature",
};