[PATCH v4 26/36] kselftest/arm64: Verify the GCS hwcap
From: Mark Brown <broonie@kernel.org>
Date: 2023-08-07 22:06:34
Also in:
kvmarm, linux-arm-kernel, linux-doc, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel selftest framework, the rest · Maintainers:
Catalin Marinas, Will Deacon, Shuah Khan, Linus Torvalds
Add coverage of the GCS hwcap to the hwcap selftest, using a read of GCSPR_EL0 to generate SIGILL without having to worry about enabling GCS. Signed-off-by: Mark Brown <broonie@kernel.org> --- tools/testing/selftests/arm64/abi/hwcap.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
index d4ad813fed10..38844e4c5aae 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c@@ -39,6 +39,17 @@ static void cssc_sigill(void) asm volatile(".inst 0xdac01c00" : : : "x0"); } +static void gcs_sigill(void) +{ + unsigned long *gcspr; + + asm volatile( + "mrs %0, S3_3_C2_C5_1" + : "=r" (gcspr) + : + : "cc"); +} + static void mops_sigill(void) { char dst[1], src[1];
@@ -223,6 +234,14 @@ static const struct hwcap_data { .cpuinfo = "cssc", .sigill_fn = cssc_sigill, }, + { + .name = "GCS", + .at_hwcap = AT_HWCAP2, + .hwcap_bit = HWCAP2_GCS, + .cpuinfo = "gcs", + .sigill_fn = gcs_sigill, + .sigill_reliable = true, + }, { .name = "MOPS", .at_hwcap = AT_HWCAP2,
--
2.30.2