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[83.57.171.7]) by smtp.gmail.com with ESMTPSA id f4sm23839332wrs.34.2021.01.31.07.35.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 31 Jan 2021 07:35:59 -0800 (PST) Sender: =?UTF-8?Q?Philippe_Mathieu=2DDaud=C3=A9?= Subject: Re: [PATCH v5 03/11] target/arm: Restrict ARMv4 cpus to TCG accel To: Peter Maydell Cc: QEMU Developers , Richard Henderson , kvm-devel , Fam Zheng , Thomas Huth , Paolo Bonzini , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Richard Henderson , Claudio Fontana , =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-arm References: <20210130015227.4071332-1-f4bug@amsat.org> <20210130015227.4071332-4-f4bug@amsat.org> <2871f7db-fe0a-51d6-312d-6d05ffa281a3@amsat.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <40ca4720-7adf-8469-2593-6e6689d03fd6@amsat.org> Date: Sun, 31 Jan 2021 16:35:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 1/30/21 7:54 PM, Peter Maydell wrote: > On Sat, 30 Jan 2021 at 18:36, Philippe Mathieu-Daudé wrote: >> >> Hi Peter, >> >> On 1/30/21 4:37 PM, Peter Maydell wrote: >>> On Sat, 30 Jan 2021 at 01:52, Philippe Mathieu-Daudé wrote: >>>> >>>> KVM requires a cpu based on (at least) the ARMv7 architecture. >>> >>> These days it requires ARMv8, because we dropped 32-bit host >>> support, and all 64-bit host CPUs are v8. >> >> Oh, this comment is about the target, to justify it is pointless to >> include pre-v7 target cpus/machines in a KVM-only binary. >> >> I'll update as: >> >> "KVM requires the target cpu based on (at least) the ARMv7 >> architecture." > > KVM requires the target CPU to be at least ARMv8, because > we only support the "host" cpu type, and all KVM host CPUs > are v8, which means you can't pass a v7 CPU as the target CPU. > (This used to not be true when we still supported running > KVM on a v7 CPU like the Cortex-A15, in which case you could > pass it to the guest.) Indeed: $ qemu-system-aarch64 -M xilinx-zynq-a9 qemu-system-aarch64: KVM is not supported for this guest CPU type qemu-system-aarch64: kvm_init_vcpu: kvm_arch_init_vcpu failed (0): Invalid argument From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DC91C433E0 for ; Sun, 31 Jan 2021 15:40:05 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EC41564E73 for ; Sun, 31 Jan 2021 15:40:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EC41564E73 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=amsat.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:46420 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l6EpX-00066p-Qp for qemu-devel@archiver.kernel.org; Sun, 31 Jan 2021 10:40:03 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:59698) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l6Elf-0002ye-L6; Sun, 31 Jan 2021 10:36:03 -0500 Received: from mail-wr1-x429.google.com ([2a00:1450:4864:20::429]:44875) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1l6Ele-0000HG-2g; Sun, 31 Jan 2021 10:36:03 -0500 Received: by mail-wr1-x429.google.com with SMTP id d16so13855104wro.11; Sun, 31 Jan 2021 07:36:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=Tj9ynb2vRPFjqtE44EpTjMkFQtoIUjhfjhxMTiCpavE=; b=bKISEXILOqbBKSyWxvRZTuqbFnMi0zbFX7AD4hLA5WBrs5OH0WAyfczzJO+CNwqZsH Px6aqJnUVVzUonDQ10/D4g69YH1ddYR09nffJI/ZWFikuSfuVxu3j6deINIQFetTavz5 7CB+cq5ySm37Y8rJ8MwxUmhoZdKCfu36fgGzfloOWPaLi22Cp9ygPjj8aGlQIaaQHq8p 2IHzfac/aVBfZIQQtBiotSnheZvuijwqcKpFhuI1E5CjikLGMbyONtbX/FkkDI2N54ec G0A6Ytwl9tirRcjmpbOsSElN5Jz/07qnnKLQNXGICM/tyABc8/kd8gkD8S3sorOVk8M9 9RCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:cc:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Tj9ynb2vRPFjqtE44EpTjMkFQtoIUjhfjhxMTiCpavE=; b=GW5R69zvX2Q2ttfrrb92E6G4zhACEEPDqUQkKrxHdyl0VKionuFkVERviFeae5ovii Q3p+xKA93v26wkYhY/AwdN8JEG4dbihNN56GU8OkDQ9wtkpllyjOgXIjLfZsABNfKMx3 c48fBqgIgR0547fJNumI/jXt126vYNhHUEqS06Xj3bCQL4j7y5Wps/aiMPVSOSxN+KgC EpgC8kIFTRRgGHej2lZNwDHWfitM9uolr8sW3CoAAHVFI/y+Oms3Rx2/NRP1uy2nHDRH P0N/GPBa+7OLGaRWoIMjNJ9li4i+HjC+vgUJ/zUgpBALwPNRy0ISLYoOi8YkNWAoLEdu 6OoA== X-Gm-Message-State: AOAM531YeWTlYXccXS77fP/lA/YrTobl+lWAtFJVPFVXXzR6Da34roov FhlvlVf2eOqE5DW2L0UEQ2Uq2sWHqtE= X-Google-Smtp-Source: ABdhPJwxwfwJ1O3wZnQXDc1ZmYatUowqBlUM5eDlN14YoQfKfNZKRQ03jZH9GWmo0RCtIQi/fXcy0A== X-Received: by 2002:adf:ecc5:: with SMTP id s5mr13603929wro.423.1612107359885; Sun, 31 Jan 2021 07:35:59 -0800 (PST) Received: from [192.168.1.36] (7.red-83-57-171.dynamicip.rima-tde.net. [83.57.171.7]) by smtp.gmail.com with ESMTPSA id f4sm23839332wrs.34.2021.01.31.07.35.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 31 Jan 2021 07:35:59 -0800 (PST) Subject: Re: [PATCH v5 03/11] target/arm: Restrict ARMv4 cpus to TCG accel To: Peter Maydell References: <20210130015227.4071332-1-f4bug@amsat.org> <20210130015227.4071332-4-f4bug@amsat.org> <2871f7db-fe0a-51d6-312d-6d05ffa281a3@amsat.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <40ca4720-7adf-8469-2593-6e6689d03fd6@amsat.org> Date: Sun, 31 Jan 2021 16:35:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::429; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x429.google.com X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NICE_REPLY_A=-0.079, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Thomas Huth , kvm-devel , =?UTF-8?Q?Alex_Benn=c3=a9e?= , Richard Henderson , QEMU Developers , qemu-arm , Claudio Fontana , Paolo Bonzini , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 1/30/21 7:54 PM, Peter Maydell wrote: > On Sat, 30 Jan 2021 at 18:36, Philippe Mathieu-Daudé wrote: >> >> Hi Peter, >> >> On 1/30/21 4:37 PM, Peter Maydell wrote: >>> On Sat, 30 Jan 2021 at 01:52, Philippe Mathieu-Daudé wrote: >>>> >>>> KVM requires a cpu based on (at least) the ARMv7 architecture. >>> >>> These days it requires ARMv8, because we dropped 32-bit host >>> support, and all 64-bit host CPUs are v8. >> >> Oh, this comment is about the target, to justify it is pointless to >> include pre-v7 target cpus/machines in a KVM-only binary. >> >> I'll update as: >> >> "KVM requires the target cpu based on (at least) the ARMv7 >> architecture." > > KVM requires the target CPU to be at least ARMv8, because > we only support the "host" cpu type, and all KVM host CPUs > are v8, which means you can't pass a v7 CPU as the target CPU. > (This used to not be true when we still supported running > KVM on a v7 CPU like the Cortex-A15, in which case you could > pass it to the guest.) Indeed: $ qemu-system-aarch64 -M xilinx-zynq-a9 qemu-system-aarch64: KVM is not supported for this guest CPU type qemu-system-aarch64: kvm_init_vcpu: kvm_arch_init_vcpu failed (0): Invalid argument