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[204.210.126.223]) by smtp.gmail.com with ESMTPSA id u24sm39286390pfm.200.2021.07.24.13.48.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 24 Jul 2021 13:48:03 -0700 (PDT) Subject: Re: [PATCH for-6.2 0/2] target/sparc: Drop use of gen_io_end() To: Peter Maydell , QEMU Developers References: <20210724134902.7785-1-peter.maydell@linaro.org> From: Richard Henderson Message-ID: <0750612a-5945-290c-d907-9f01e0baf336@linaro.org> Date: Sat, 24 Jul 2021 10:47:59 -1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::102a; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102a.google.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 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=-0.058, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: Mark Cave-Ayland , Artyom Tarasenko Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 7/24/21 10:27 AM, Peter Maydell wrote: > On Sat, 24 Jul 2021 at 14:49, Peter Maydell wrote: >> There is a slight difficulty here with testing this: icount >> doesn't seem to work for sparc Linux guests in master at the >> moment. For instance if you get the advent calendar image from >> https://www.qemu-advent-calendar.org/2018/download/day11.tar.xz >> it will boot without icount with a command line like >> qemu-system-sparc -display none -vga none -machine SS-20 -serial stdio -kernel /tmp/day11/zImage.elf >> But if you add '-icount auto' it will get as far as >> "bootconsole [earlyprom0] disabled" and then apparently hang. >> I'm not sure what's going on here :-( >> (I filed this as https://gitlab.com/qemu-project/qemu/-/issues/499) > > This turns out to be a recent regression, caused by commit 78ff82bb > ("accel/tcg: Reduce CF_COUNT_MASK to match TCG_MAX_INSNS"). It's > an intermittent rather than a 100% reproducible hang. Ouch. Ok, I'll have a look. r~