From nobody Tue Feb 10 01:30:19 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 E235813C9A1; Thu, 4 Jul 2024 17:28:45 +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=1720114126; cv=none; b=ndfqC+6I4u76C4HOXkEg35JNbMRTLJFGgYM7VuwVSPUzG3J+1vSuu8b225DbjYQxW7GG/GiS9kE8bYEg93xmsJPp/zcLqUtDVQ5CYRr0OJVrwnXTRSYdJZ5jxt33vNYZtGT/fRS2gK2GVou9EqkxOLjMneXXeBuIKntLrGoxiec= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720114126; c=relaxed/simple; bh=hZLMZ8MyT6kMtoPFEmNPK6rAznf1lF+TnbSpYE4U9Gw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=d5up8EHD0Zr/23V3dcUH0ONXxiED1+zYS7B6jnWDDLIVTSuVOmuUgAQUCW8ti+bE9GMAP06Qwg9MOunmOtc9SHmkMMTIHjVdtRhuGyBEow5JTvlxKewW9woe5QpNoUPTtFuxhzeg1vFUKabJXMi41P/pu329b6Rkq/+JRi5QiZE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=czq7fVvf; 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="czq7fVvf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54163C4AF0A; Thu, 4 Jul 2024 17:28:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720114125; bh=hZLMZ8MyT6kMtoPFEmNPK6rAznf1lF+TnbSpYE4U9Gw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=czq7fVvfpw8zZ9PDpBBuOELWM23B9djKCrim22XAI5fmUIN8QOucWyYZe3144UcOk /Kk5oa+UvNcHYK/24TZZjwKpkkOMwmG6/ugf+Oyq+goVadm2v9Vs70Its8M9d6t07Q t/KyuJ49x5qKjggMfrelShf+DEQ3LNf3nAp2OLjVQCKZmdiDhjsyICOzYYPL2i3YZ+ oY60zGybNcrgw3502h0+WOZ1iD3FxBV49x8+9ZjdHnnGPs8uYZf1geyoaGbxgI1uxE OgO/EzxTTCPJweyQqe8TKF6tj80KsuwjzaJNwkbsEAKnPN8ezdmANRWdw9RVmYVabJ g/nhuZmJiAJog== From: Mark Brown Date: Thu, 04 Jul 2024 18:28:16 +0100 Subject: [PATCH v4 1/4] arm64/fpsimd: Introduce __bit_to_vl() helper 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: <20240704-kvm-arm64-fix-pkvm-sve-vl-v4-1-b6898ab23dc4@kernel.org> References: <20240704-kvm-arm64-fix-pkvm-sve-vl-v4-0-b6898ab23dc4@kernel.org> In-Reply-To: <20240704-kvm-arm64-fix-pkvm-sve-vl-v4-0-b6898ab23dc4@kernel.org> To: Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Fuad Tabba Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, Mark Brown X-Mailer: b4 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=3064; i=broonie@kernel.org; h=from:subject:message-id; bh=hZLMZ8MyT6kMtoPFEmNPK6rAznf1lF+TnbSpYE4U9Gw=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmhtvFK7ynTjDA3VBW5+3nCTmmSgV+pDygMv8Pa5of tovF3L2JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZobbxQAKCRAk1otyXVSH0NjzB/ 9wAyCRckkz1EF1KyO3aLbh6rTu90S/RI2qugJgleo/PlnfJsFd0CP4Jhk6M1hPpm6EyqjwD47VRihf 1dvghkKGzVEbbk9UNzGROESbYg5fq8g8V+CZZnF5CCI9iSpdwHRnkERVuzwWVG7T35vlRf2fKrJ5ru xGRteEn1YU9i4c2txqKYLHuwV2KmOSXcan0h3hfV5N3SThCpBzJ6X5/Wy7AiYAtTeRZzy6Wycxobxj zf/5/zXZ/82T/8W0WC4IWJ6rmolkkDK/39Zz6pfvc8KdYYzPCrwyT4luLwp9PU5TqOG2z/firzEwFR 0s8nhJ/IZhIdnIqp4SStA7Qj0TcTWG X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB In all cases where we use the existing __bit_to_vq() helper we immediately convert the result into a VL. Provide and use __bit_to_vl() doing this directly. Acked-by: Catalin Marinas Signed-off-by: Mark Brown --- arch/arm64/include/asm/fpsimd.h | 4 ++++ arch/arm64/kernel/fpsimd.c | 12 ++++++------ 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsim= d.h index bc69ac368d73..51c21265b4fa 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -172,6 +172,10 @@ static inline unsigned int __bit_to_vq(unsigned int bi= t) return SVE_VQ_MAX - bit; } =20 +static inline unsigned int __bit_to_vl(unsigned int bit) +{ + return sve_vl_from_vq(__bit_to_vq(bit)); +} =20 struct vl_info { enum vec_type type; diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 82e8a6017382..22542fb81812 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -530,7 +530,7 @@ static unsigned int find_supported_vector_length(enum v= ec_type type, =20 bit =3D find_next_bit(info->vq_map, SVE_VQ_MAX, __vq_to_bit(sve_vq_from_vl(vl))); - return sve_vl_from_vq(__bit_to_vq(bit)); + return __bit_to_vl(bit); } =20 #if defined(CONFIG_ARM64_SVE) && defined(CONFIG_SYSCTL) @@ -1103,7 +1103,7 @@ int vec_verify_vq_map(enum vec_type type) * Mismatches above sve_max_virtualisable_vl are fine, since * no guest is allowed to configure ZCR_EL2.LEN to exceed this: */ - if (sve_vl_from_vq(__bit_to_vq(b)) <=3D info->max_virtualisable_vl) { + if (__bit_to_vl(b) <=3D info->max_virtualisable_vl) { pr_warn("%s: cpu%d: Unsupported vector length(s) present\n", info->name, smp_processor_id()); return -EINVAL; @@ -1169,7 +1169,7 @@ void __init sve_setup(void) set_bit(__vq_to_bit(SVE_VQ_MIN), info->vq_map); =20 max_bit =3D find_first_bit(info->vq_map, SVE_VQ_MAX); - info->max_vl =3D sve_vl_from_vq(__bit_to_vq(max_bit)); + info->max_vl =3D __bit_to_vl(max_bit); =20 /* * For the default VL, pick the maximum supported value <=3D 64. @@ -1188,7 +1188,7 @@ void __init sve_setup(void) /* No virtualisable VLs? This is architecturally forbidden. */ info->max_virtualisable_vl =3D SVE_VQ_MIN; else /* b + 1 < SVE_VQ_MAX */ - info->max_virtualisable_vl =3D sve_vl_from_vq(__bit_to_vq(b + 1)); + info->max_virtualisable_vl =3D __bit_to_vl(b + 1); =20 if (info->max_virtualisable_vl > info->max_vl) info->max_virtualisable_vl =3D info->max_vl; @@ -1305,10 +1305,10 @@ void __init sme_setup(void) WARN_ON(bitmap_empty(info->vq_map, SVE_VQ_MAX)); =20 min_bit =3D find_last_bit(info->vq_map, SVE_VQ_MAX); - info->min_vl =3D sve_vl_from_vq(__bit_to_vq(min_bit)); + info->min_vl =3D __bit_to_vl(min_bit); =20 max_bit =3D find_first_bit(info->vq_map, SVE_VQ_MAX); - info->max_vl =3D sve_vl_from_vq(__bit_to_vq(max_bit)); + info->max_vl =3D __bit_to_vl(max_bit); =20 WARN_ON(info->min_vl > info->max_vl); =20 --=20 2.39.2