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[174.21.143.238]) by smtp.gmail.com with ESMTPSA id 16sm174913pjg.56.2020.05.19.11.01.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 19 May 2020 11:01:21 -0700 (PDT) Subject: Re: [PATCH 0/2] Update use_goto_tb() in hppa and rx targets To: Ahmed Karaman , qemu-devel@nongnu.org, rth@twiddle.net, ysato@users.sourceforge.jp References: <20200519162144.10831-1-ahmedkhaledkaraman@gmail.com> From: Richard Henderson Message-ID: Date: Tue, 19 May 2020 11:01:18 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200519162144.10831-1-ahmedkhaledkaraman@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::444; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x444.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: aleksandar.qemu.devel@gmail.com, alex.bennee@linaro.org, stefanha@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/19/20 9:21 AM, Ahmed Karaman wrote: > The issue arose because the page crossings check in use_goto_tb() > function is required only in the system mode. Checking it in both modes > causes an unnecessary overhead in the user mode. It is not only required in system mode. You can see failures in user-mode if you modify executable pages, or change their permissions with mmap. Such as if the guest program contains a JIT. r~