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Wed, 07 Apr 2021 06:55:59 -0700 (PDT) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id j23sm8122562wmo.33.2021.04.07.06.55.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Apr 2021 06:55:58 -0700 (PDT) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id A216A1FF7E; Wed, 7 Apr 2021 14:55:57 +0100 (BST) References: <20210406174031.64299-1-richard.henderson@linaro.org> <20210406174031.64299-2-richard.henderson@linaro.org> User-agent: mu4e 1.5.11; emacs 28.0.50 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Richard Henderson Subject: Re: [PATCH v4 01/12] accel/tcg: Preserve PAGE_ANON when changing page permissions Date: Wed, 07 Apr 2021 14:55:20 +0100 In-reply-to: <20210406174031.64299-2-richard.henderson@linaro.org> Message-ID: <87tuoiurki.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x333.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 autolearn=unavailable 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: qemu-arm@nongnu.org, qemu-devel@nongnu.org, Stephen Long Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Richard Henderson writes: > Using mprotect() to change PROT_* does not change the MAP_ANON > previously set with mmap(). Our linux-user version of MTE only > works with MAP_ANON pages, so losing PAGE_ANON caused MTE to > stop working. > > Reported-by: Stephen Long > Signed-off-by: Richard Henderson Yay test case ;-) It certainly fails before and works after. Tested-by: Alex Benn=C3=A9e Reviewed-by: Alex Benn=C3=A9e --=20 Alex Benn=C3=A9e