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 3D8D8C77B75 for ; Tue, 16 May 2023 20:16:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pz157-0006PG-JL; Tue, 16 May 2023 16:15:37 -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 1pz14z-0006Lv-Kq for qemu-devel@nongnu.org; Tue, 16 May 2023 16:15:29 -0400 Received: from mail-pf1-x429.google.com ([2607:f8b0:4864:20::429]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1pz14w-0001hC-Mh for qemu-devel@nongnu.org; Tue, 16 May 2023 16:15:28 -0400 Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-6434e65d808so15348748b3a.3 for ; Tue, 16 May 2023 13:15:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1684268125; x=1686860125; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=6ALXpJK+7DvrwDIzFYeRW/niyeZZakhY3E0cVXl3WYM=; b=TwFDu7rtTa6LjGV++Bmgn0r85y2wxsc/aPLH/Zpw7De2yW5hH+Lg/QO/5yERz2kUY4 ebJvrPOFPO9yz8+fcNr8S9q3e6fCXrac1l6ohI7dA7QSg816wFMeypJ6C4MidAcnCtsT zZ248FZwHW6lY7ePbckCNCv835K8u3Cmvt0w2BEV7Z06OB0LDAMt0PchxgOFaQLEzBbg /4lzU5rLBWwoHKY0YmirOMPdiRMw7GSph1os+jWA5YXrDv+l/ywAzD+N+UR2bvA8oulL j4t3kbpu3WDXsoPxIlll0MkOiutVZZ4SHsccRNacd5ACaP0oyVRE+ILNYtTZ8i5K/gR4 630Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684268125; x=1686860125; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=6ALXpJK+7DvrwDIzFYeRW/niyeZZakhY3E0cVXl3WYM=; b=XArDmIkFqyN58d1WRCmB/M6jkPlEuU+hsbPu7EG8LoO37enhhg83s0KhY82jIvEBQx pjtAkQVHue6MU87J5pjxpe+3Skj2iOgks3N/imNm7nMMN/sLWbXU8sL4GaafdoH8NQkN lm50O6NjPA7bgCL5Wp9K+xKXbmVbX3jVSjGr/C0L6esWmH5F0VhgHAk9hiy4A8GlYkOn 6cfeSGb7UmpXwyRdzlM8RZRi5z+onBuygaOQfvuZkD3ocdbrsPIQkc6SaDyu7idZacvW skZs3q3yUTm3mkgVOIGa6a7aJwn3ydt9TrNqupCB+zACkf5Nuu5+hb0BkA/Z9VOFLvLY bnMQ== X-Gm-Message-State: AC+VfDyNiiucNIJ30Ejku/k6yScnWIzlaB+F/uIt+N2A3C+WBqKX/pVt UPlXChB44OCzu+3LQhHUhcdRuYl/7tutjEmwDFU= X-Google-Smtp-Source: ACHHUZ4Ve8SjrPj1cbkCmbn54jgjwpggfpu5pCqPbikKnjRUM2L9WXbSWXX9SP/P5C9hviilOsMZkg== X-Received: by 2002:a05:6a00:2408:b0:63f:18ae:1d5f with SMTP id z8-20020a056a00240800b0063f18ae1d5fmr49249310pfh.29.1684268124728; Tue, 16 May 2023 13:15:24 -0700 (PDT) Received: from ?IPV6:2602:ae:1598:4c01:ec81:440e:33a4:40b9? ([2602:ae:1598:4c01:ec81:440e:33a4:40b9]) by smtp.gmail.com with ESMTPSA id x20-20020aa793b4000000b0063d2bb0d107sm13886101pff.64.2023.05.16.13.15.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 May 2023 13:15:24 -0700 (PDT) Message-ID: <91729126-1e70-2d80-88f4-c636199dba6a@linaro.org> Date: Tue, 16 May 2023 13:15:22 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [RFC PATCH] target/arm: add RAZ/WI handling for DBGDTR[TX|RX] Content-Language: en-US To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Anders Roxell , Evgeny Iakovlev , Peter Maydell References: <20230516104420.407912-1-alex.bennee@linaro.org> From: Richard Henderson In-Reply-To: <20230516104420.407912-1-alex.bennee@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::429; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x429.google.com X-Spam_score_int: -47 X-Spam_score: -4.8 X-Spam_bar: ---- X-Spam_report: (-4.8 / 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, NICE_REPLY_A=-2.666, 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 5/16/23 03:44, Alex Bennée wrote: > 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. > > Cc: Anders Roxell > Cc: Evgeny Iakovlev > Signed-off-by: Alex Bennée > --- > target/arm/debug_helper.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) Reviewed-by: Richard Henderson r~