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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 95447C77B7D for ; Thu, 18 May 2023 10:11:20 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pzabB-000358-8E; Thu, 18 May 2023 06:11:05 -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 1pzab9-00034k-Qr for qemu-devel@nongnu.org; Thu, 18 May 2023 06:11:03 -0400 Received: from mail-ed1-x532.google.com ([2a00:1450:4864:20::532]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1pzab8-0003PT-B3 for qemu-devel@nongnu.org; Thu, 18 May 2023 06:11:03 -0400 Received: by mail-ed1-x532.google.com with SMTP id 4fb4d7f45d1cf-50be17a1eceso3190263a12.2 for ; Thu, 18 May 2023 03:11:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1684404661; x=1686996661; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=vScuOnyVFxi8AXSnCF0Ztm0U6LugS58i6f/I6I8ifvk=; b=v95m79OPCOCWNj3YX2w0P5pGLV0AfXrCXJfipoqaTBkxMLJdXoO6DxztxeO7QOx7YT 8VttwF07ZWR/CyXO+1lA3lVQB3QHthXeQUP/3ROZLjwOPWN+XTUCvXwq9u5BIfJTeEGD WkTBV5LkBKo9GxjOAehaGhFz3T+73iggXXLy4ZqLlizMNVuWRKrMMX5FdWSBpc/2hVEL ybGm0cERo55w6LMXYV2AXbm8dSESjWw7+/0lzzfo9GMfSxLB0/4P8vDVXPTLB9UGWbRr cz3w1isi/LCjDNkjEGkgTCPHWhQm3F7xRbuTsMx2YPCpcw6Vi3gl2SXVbF/kJw8lxO4K P+Qg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684404661; x=1686996661; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=vScuOnyVFxi8AXSnCF0Ztm0U6LugS58i6f/I6I8ifvk=; b=AACLyjg7rVE2Dpo39ZKrnalzuZT4F8cBTObqozSVGuLohvUK1C4mlWI3Z2vWIemkL0 epTKk1bKv513wTipPcNzz5D4u9isbAVgx0D2QzuU5RgHRjoBtMURYDYrjqX2yoC+reoh zAV525OQJmX54IRxhtuOtulNwfStVLYzLulDP165qfviCY426JFpBONOV4R9iwYTcqz5 2soryK/P8ToKU9jOrYLO48+9eeBCeC0nlg96Aw5d9B3XiTf4GvUKrXs5riOJZz2HYSDR BEJxvDdfSMmhgnt4KZ0YeepEmlcSXaIPFZawB6nv1DRNEg40IZZh908Jp7Lzh/YaGWNV oAqg== X-Gm-Message-State: AC+VfDwrvnNeaAxRrEkHsXkHb/xD6Ye9VjyVi092mMrMkTe04Yt7nuv4 vQFRvKZKlEd2PB/ii1gc1jyVq6fX1szJmvCmT4W4sw== X-Google-Smtp-Source: ACHHUZ5plqNHL1Po/U+akHPLRwFBJvc3nWrKp+aNSO7DiCv4vSI99peBowY4iMoQHkZwKCRYpey3C1GQEcuilKiv2xU= X-Received: by 2002:a50:eb0c:0:b0:50b:c1d6:8d60 with SMTP id y12-20020a50eb0c000000b0050bc1d68d60mr4912561edp.21.1684404660879; Thu, 18 May 2023 03:11:00 -0700 (PDT) MIME-Version: 1.0 References: <20230516104420.407912-1-alex.bennee@linaro.org> In-Reply-To: <20230516104420.407912-1-alex.bennee@linaro.org> From: Peter Maydell Date: Thu, 18 May 2023 11:10:50 +0100 Message-ID: Subject: Re: [RFC PATCH] target/arm: add RAZ/WI handling for DBGDTR[TX|RX] To: =?UTF-8?B?QWxleCBCZW5uw6ll?= Cc: qemu-devel@nongnu.org, qemu-arm@nongnu.org, Anders Roxell , Evgeny Iakovlev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::532; envelope-from=peter.maydell@linaro.org; helo=mail-ed1-x532.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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Tue, 16 May 2023 at 11:44, Alex Benn=C3=A9e wro= te: > > The commit b3aa2f2128 (target/arm: provide stubs for more external > debug registers) was added to handle HyperV's unconditional usage of > Debug Communications Channel. It turns out that Linux will similarly > break if you enable CONFIG_HVC_DCC "ARM JTAG DCC console". > > Extend the registers we RAZ/WI set to avoid this. Applied to target-arm.next, thanks. (In theory we could implement the DCC and wire it up to a chardev, which might be a cute way of getting early debug.) -- PMM