From nobody Mon Feb 9 06:48:18 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 241265EE79 for ; Tue, 13 Feb 2024 15:35:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707838553; cv=none; b=Mfyl/7JbSUq0TLqmPcYTxVij9ge/TbdjLCJf2tyR/rZ4BKupnjXikcdGGJy6To6vN/BCy7fOYb8Y610XNm5PlIDUGf3y/qPlsA7SQmQB9J151DThRSQgK5U/4CZYGfDYBfmn63MzjQCsVrNLudlGzhkJSoFFiTSOyGkMEPO2BkI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707838553; c=relaxed/simple; bh=SUBjxkuKBtRVkvGx34gf818xvgGWgaa/xPYwJFrPRlM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BsKRcHFi7/pkqrHlBciCjumtqavlr4eLFiDXMXE+DMlztzLQTYnK0q9BNzd6+im7H72uFF2DZ0G7Ykbcq9ufn3X9wMJdiW2mZHVbs4u6HwY2DwC6SjU5SGnaMaqXxhC9rftSe8MhdjuyCL8zOGNEGkGVpGZRUTU4PaQzoKoRe+k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kd/9uVyy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kd/9uVyy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 752ABC43399; Tue, 13 Feb 2024 15:35:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707838552; bh=SUBjxkuKBtRVkvGx34gf818xvgGWgaa/xPYwJFrPRlM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=kd/9uVyyIJb5NAJl3o+ZexzNZwJkGOgxeNr2DwrbbuSFfxBuBBnCxfWzrjldxs9b5 fwoK01VQpIJun/p1nejaIMQcLSttc9fgvDlVuV/NPQl/KSsvv2FzNeTHNcOlUmsu3Y +Fg7t9vX/9ybXMMoKbL0ieHkQ7oxJXKE8GF8yM5SXgG8OXZj40nt6U+yttDzgbwFnW HdW4QpVJJrkvZnvRzhaax76ZQIvTjey69jbug2hzpf4sTWczabdocO6Coir8nYd3VI CZzDNzcXpa6G2PhiMPQrcVxw4hvuOv9zrMXvZkwoInPY08oGsds4vA+9mOIVPR4zUO ROIhKq36K23Bw== From: Mark Brown Date: Tue, 13 Feb 2024 15:32:45 +0000 Subject: [PATCH 1/2] arm64/sve: Ensure that all fields in ZCR_EL1 are set to known values Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240213-arm64-fp-init-vec-cr-v1-1-7e7c2d584f26@kernel.org> References: <20240213-arm64-fp-init-vec-cr-v1-0-7e7c2d584f26@kernel.org> In-Reply-To: <20240213-arm64-fp-init-vec-cr-v1-0-7e7c2d584f26@kernel.org> To: Catalin Marinas , Will Deacon Cc: Dave Martin , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-a684c X-Developer-Signature: v=1; a=openpgp-sha256; l=849; i=broonie@kernel.org; h=from:subject:message-id; bh=SUBjxkuKBtRVkvGx34gf818xvgGWgaa/xPYwJFrPRlM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBly4xU8jE97v/JDxRmvJyueiHa2XfsWKq9Yvi56jLQ ptOViZWJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZcuMVAAKCRAk1otyXVSH0DflB/ 9VepOmmsuiVYGDQF13XF2tE56zYQ7dQMtVpBtyjZDXvgXXEI1IA/BeL4nUYq2sfeXiSzMyFFybqImD Gv6EgNRRqoAs1xXNH9TBCJMYZxLx11YF0apQqr8+VRyOCfl8eF99DhSRV+Im5cG/puiNysDr6j0XKi fNxRSdbsfh/y+1upsRPPRWLTOXqCSqDuDkhZz6ZlVpKOUG7zyabwO9v9gMbfSFwbNZUlxjqAXveva/ duOjOXx1Gjr1RcKcSAcQiMOzXb6hHrSU/cDyAtr7ZvowCzXfLiDc5knyWP+ysnEf79QWOfcbw4oVRl H9ox2a/OjlARoFxcgBJ9SVPJ8gVpLr X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB At present nothing in our CPU initialisation code ever sets unknown fields in ZCR_EL1 to known values, all updates to ZCR_EL1 are read/modify/write sequences for LEN. All the unknown fields are RES0, explicitly initialise them as such to avoid future surprises. Signed-off-by: Mark Brown --- arch/arm64/kernel/fpsimd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index a5dc6f764195..cc3c9ad877a8 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1134,6 +1134,8 @@ void cpu_enable_sve(const struct arm64_cpu_capabiliti= es *__always_unused p) { write_sysreg(read_sysreg(CPACR_EL1) | CPACR_EL1_ZEN_EL1EN, CPACR_EL1); isb(); + + write_sysreg_s(0, SYS_ZCR_EL1); } =20 void __init sve_setup(void) --=20 2.30.2