From nobody Wed Dec 17 07:25:47 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1751639066; cv=none; d=zohomail.com; s=zohoarc; b=I3MpFDkZCArslox+qUi1oVlOmnRrztLFYxUt+/NIkdpWKHFsmuON2G0Dk+7V2R+SXtO5GhE4odNgaZIxyugGP2jf4cjL84wF35/M4R7k6JFeVJJyrM0/MjZFXZXAlWzPmLiap1e1CdvCt54wzA8Zezzs0jRvZNZxwU/i8El15Vc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1751639066; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=SujQ6LdtijDSv29ZxZzc+699lWE9s+/bKoHsoQqj4yY=; b=cpnugxq9cMJRX4NbUhepOF7t+TAEOCxshMX/M/D4zP2T61M+1K1PyuJvyYpI2fBdBr26sTUWx4jx1nlaskZFlHxL++BGPRqSp4fCHFF6Uk3nYPsnxM09mqCFApwzaR0APlZhbnaN/VOMWAE4eeQDwOyVYn7nniD+agUMa3p93x4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1751639066475767.8105089192857; Fri, 4 Jul 2025 07:24:26 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uXhIg-0006Su-Kf; Fri, 04 Jul 2025 10:22:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uXhI8-0004yN-AN for qemu-devel@nongnu.org; Fri, 04 Jul 2025 10:21:28 -0400 Received: from mail-oa1-x2e.google.com ([2001:4860:4864:20::2e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1uXhI2-0005Mj-UJ for qemu-devel@nongnu.org; Fri, 04 Jul 2025 10:21:28 -0400 Received: by mail-oa1-x2e.google.com with SMTP id 586e51a60fabf-2ea58f008e9so1149842fac.0 for ; Fri, 04 Jul 2025 07:21:22 -0700 (PDT) Received: from localhost.localdomain (fixed-187-189-51-143.totalplay.net. [187.189.51.143]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-2f78ff0471esm528016fac.3.2025.07.04.07.21.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Jul 2025 07:21:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1751638882; x=1752243682; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=SujQ6LdtijDSv29ZxZzc+699lWE9s+/bKoHsoQqj4yY=; b=TzfqLhaA4GgK8dSDMg1dCX1jR9ma35Ryg0GCpmpYV/RkIdsYj4UJB0ej1B8htaiyYc U/Ym1AhEgv1+8yj8Sarg79LpmDgycYYr1qe6Va/FwcJtyNjSDcZDrj/4Tz2ss9TEHbHW 2LWApReH3Ofy6bUiRcvthHS0nn0dFJ3jv9LpitCp7v93s/0+zrhrocfBDqPLVG+hdFtL jPxaJWTFj7aSJ/h2OPkUO+hkr8XriTv3xk7ubci+ZvqJCUbJs+c0ScTFMPaTdKU/tA/B iiBCiTdBvPAia3iF2HXlCO2qyLC6Tl7bFeLJnpezcr/SX7D/lTDmGWS6XbSRyb/xQJcg Qs8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751638882; x=1752243682; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SujQ6LdtijDSv29ZxZzc+699lWE9s+/bKoHsoQqj4yY=; b=NvmxEY7+OKYfOdEsUOkpLaKI2qZl6lYeT8g3FYigiUIRjT8p8MFEHI5j5gnSqRCW4y PClOxlD30NmmYvuOnVh24DgqO+y4TsJhx0t0wCCrzqhHfzSgN0VA1hrQ6LytkR/xfCxd +WrYR6UG66ZZmEKtBgKAWVm2Ns0m5eczbZd+XKqISidGHUn6j70rABvBaIdw+pZ4DNcw oYAPUNlTReBx2Q/w35s8VM8hgnIk0SHMmEKzRP/BsthdcaBKot5IeIcXAZIwo2exyE0B TZTDsjXQ2mRDKVCgDVglv7SDXNl9AGuSsAygyAQ7pnuCBIUPTCAEbdpYfHGza7zWKe3F +D1Q== X-Gm-Message-State: AOJu0Yww7htyE2iT8gz5fLgVQuC0CNyZ95A8rqSoTgfG4yLnAsemMvIx o4RCr9662PhFyA7YeLWT0F0vE7hYtSG+hRuQHlDZs05MJHB4twIfh7r8m23QXtrkC0RNNdmT3Sv vzcsU8FE= X-Gm-Gg: ASbGnctwNkU9EP3hvo/Y3UMgoIYAPR8hlNFSCDgTYgYo/0osS6+5bczT2tFAO8fnhuz /Uvm7uodROvGrZAMUKcqDwwkJSnlp+JRmB/IazQSE8GYLV7wps/f0mxnGPjHkIQ40Rd5MbrLdGE cVho3K/gXl9TRxL5AyTGQzPj8K+/WTdOxY0AS1H08dRNVDImmwm5G4aptYd4/nzhjeuHtclUcIo JOd8RlhTvZ+Nn7G+YLttl/H+IjkSdlNrtAkOpPhvXLHr3jSfUePt9kbdy8Rlr/JwlYlzBWyC2h8 o0yz5+3vF5vkC73KnC8lMVVCLP2nmGRN810qDvK6MvX9AWbsAtHtVKHZrpR4JffCptf7CZ4H8SN zZf9Kgmj3fXWK9lcQ+EfntODtr/dvgTPnPCTHfvrG7ON9nRgN X-Google-Smtp-Source: AGHT+IGQaK8REYNViSqnvHti/D/YZkMZFAl7gl383z8/op8p34TaypQLVhr4snoy5SaQnSnDdocYjg== X-Received: by 2002:a05:6870:c086:b0:29e:2594:81e with SMTP id 586e51a60fabf-2f796a75f48mr1758726fac.13.1751638881021; Fri, 04 Jul 2025 07:21:21 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, peter.maydell@linaro.org Subject: [PATCH v4 006/108] target/arm: Disable FEAT_F64MM if maximum SVE vector size too small Date: Fri, 4 Jul 2025 08:19:29 -0600 Message-ID: <20250704142112.1018902-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250704142112.1018902-1-richard.henderson@linaro.org> References: <20250704142112.1018902-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2001:4860:4864:20::2e; envelope-from=richard.henderson@linaro.org; helo=mail-oa1-x2e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1751639068846116600 Content-Type: text/plain; charset="utf-8" All F64MM instructions operate on a 256-bit vector. If only 128-bit vectors is supported by the cpu, then the cpu cannot enable F64MM. Suggested-by: Peter Maydell Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- target/arm/cpu64.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index 1f3406708b..77e7c4a6a5 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -259,6 +259,13 @@ void arm_cpu_sve_finalize(ARMCPU *cpu, Error **errp) /* From now on sve_max_vq is the actual maximum supported length. */ cpu->sve_max_vq =3D max_vq; cpu->sve_vq.map =3D vq_map; + + /* FEAT_F64MM requires the existence of a 256-bit vector size. */ + if (max_vq < 2) { + uint64_t t =3D GET_IDREG(&cpu->isar, ID_AA64ZFR0); + t =3D FIELD_DP64(t, ID_AA64ZFR0, F64MM, 0); + SET_IDREG(&cpu->isar, ID_AA64ZFR0, t); + } } =20 /* --=20 2.43.0