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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-09-03 14:09:17 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2024-09-13 17:28:36 +0200 |
| commit | 712676ea2bb3882a852bcf49862c4247317fc9b2 (patch) | |
| tree | 17d406ce2b8c3ee29444e36f3ff9ba9abaabc22d /tools/testing/selftests/vDSO/Makefile | |
| parent | arm64: alternative: make alternative_has_cap_likely() VDSO compatible (diff) | |
| download | linux-712676ea2bb3882a852bcf49862c4247317fc9b2.tar.xz linux-712676ea2bb3882a852bcf49862c4247317fc9b2.zip | |
arm64: vDSO: Wire up getrandom() vDSO implementation
Hook up the generic vDSO implementation to the aarch64 vDSO data page.
The _vdso_rng_data required data is placed within the _vdso_data vvar
page, by using a offset larger than the vdso_data.
The vDSO function requires a ChaCha20 implementation that does not write
to the stack, and that can do an entire ChaCha20 permutation. The one
provided uses NEON on the permute operation, with a fallback to the
syscall for chips that do not support AdvSIMD.
This also passes the vdso_test_chacha test along with
vdso_test_getrandom. The vdso_test_getrandom bench-single result on
Neoverse-N1 shows:
vdso: 25000000 times in 0.783884250 seconds
libc: 25000000 times in 8.780275399 seconds
syscall: 25000000 times in 8.786581518 seconds
A small fixup to arch/arm64/include/asm/mman.h was required to avoid
pulling kernel code into the vDSO, similar to what's already done in
arch/arm64/include/asm/rwonce.h.
Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'tools/testing/selftests/vDSO/Makefile')
| -rw-r--r-- | tools/testing/selftests/vDSO/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile index 04930125035e..3c6fafbd83a6 100644 --- a/tools/testing/selftests/vDSO/Makefile +++ b/tools/testing/selftests/vDSO/Makefile @@ -9,7 +9,7 @@ ifeq ($(ARCH),$(filter $(ARCH),x86 x86_64)) TEST_GEN_PROGS += vdso_standalone_test_x86 endif TEST_GEN_PROGS += vdso_test_correctness -ifeq ($(ARCH)$(CONFIG_X86_32),$(filter $(ARCH)$(CONFIG_X86_32),x86 x86_64 loongarch)) +ifeq ($(ARCH)$(CONFIG_X86_32),$(filter $(ARCH)$(CONFIG_X86_32),x86 x86_64 loongarch arm64)) TEST_GEN_PROGS += vdso_test_getrandom TEST_GEN_PROGS += vdso_test_chacha endif @@ -40,5 +40,6 @@ $(OUTPUT)/vdso_test_getrandom: CFLAGS += -isystem $(top_srcdir)/tools/include \ $(OUTPUT)/vdso_test_chacha: $(top_srcdir)/tools/arch/$(SRCARCH)/vdso/vgetrandom-chacha.S $(OUTPUT)/vdso_test_chacha: CFLAGS += -idirafter $(top_srcdir)/tools/include \ -idirafter $(top_srcdir)/arch/$(SRCARCH)/include \ + -idirafter $(top_srcdir)/arch/$(SRCARCH)/include/generated \ -idirafter $(top_srcdir)/include \ -D__ASSEMBLY__ -Wa,--noexecstack |