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([2602:ae:154e:e201:a7aa:1d1d:c857:5500]) by smtp.gmail.com with ESMTPSA id i15-20020a62870f000000b0051bc5f4df1csm2212402pfe.154.2022.08.12.17.30.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 12 Aug 2022 17:30:13 -0700 (PDT) Message-ID: <804cd7cd-e83c-2b89-f2ba-cc2ca5c7f835@linaro.org> Date: Fri, 12 Aug 2022 17:30:10 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: Re: [PATCH] riscv: Make semihosting configurable for all privilege modes Content-Language: en-US To: Furquan Shaikh Cc: Palmer Dabbelt , Alistair Francis , Bin Meng , qemu-riscv@nongnu.org, qemu-devel@nongnu.org References: <37244ef8-d2f1-038a-8a51-01d9f62fbe2c@linaro.org> From: Richard Henderson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42b; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42b.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, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, T_SPF_HELO_TEMPERROR=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" On 8/12/22 16:57, Furquan Shaikh wrote: > I am not sure if I understood your comment correctly. Currently, qemu > has a check in `riscv_cpu_do_interrupt` to allow semihosting calls > only in S and M modes. This prevents semihosting calls from U mode. > This patch changes the default behavior of checking `>= PRV_S` for > semihosting and instead replaces it with the usage of > ebreak{m,s,u,vs,vu} properties to allow the user to configure what > modes should allow semihosting calls when `-semihosting` argument is > selected. Why do you need such fine-grained control? What is the use-case? r~