linux-kernel - [PATCH v6 28/38] kselftest/arm64: Verify the GCS hwcap

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Message-Id: <20231009-arm64-gcs-v6-28-78e55deaa4dd@kernel.org>
Date:   Mon, 09 Oct 2023 13:09:02 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Arnd Bergmann <arnd@...db.de>, Oleg Nesterov <oleg@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <shuah@...nel.org>,
        "Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
        Deepak Gupta <debug@...osinc.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>
Cc:     "H.J. Lu" <hjl.tools@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Florian Weimer <fweimer@...hat.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        kvmarm@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH v6 28/38] kselftest/arm64: Verify the GCS hwcap

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@...nel.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 e3d262831d91..785c9a4ad666 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c
@@ -63,6 +63,17 @@ static void fp_sigill(void)
 	asm volatile("fmov s0, #1");
 }
 
+static void gcs_sigill(void)
+{
+	unsigned long *gcspr;
+
+	asm volatile(
+		"mrs	%0, S3_3_C2_C5_1"
+	: "=r" (gcspr)
+	:
+	: "cc");
+}
+
 static void ilrcpc_sigill(void)
 {
 	/* LDAPUR W0, [SP, #8] */
@@ -327,6 +338,14 @@ static const struct hwcap_data {
 		.cpuinfo = "fp",
 		.sigill_fn = fp_sigill,
 	},
+	{
+		.name = "GCS",
+		.at_hwcap = AT_HWCAP2,
+		.hwcap_bit = HWCAP2_GCS,
+		.cpuinfo = "gcs",
+		.sigill_fn = gcs_sigill,
+		.sigill_reliable = true,
+	},
 	{
 		.name = "JSCVT",
 		.at_hwcap = AT_HWCAP,

-- 
2.30.2