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[187.189.51.144]) by smtp.gmail.com with ESMTPSA id i11sm1953966otp.76.2021.03.20.09.57.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Mar 2021 09:57:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=0jLCRbOfP8b7p8Z2vRhheskl97O3VX3ZegE0fpM6SkE=; b=auXJFJlCl5tHNojb9R7EmjqhQFElUU8z3T6ZlJc072yLEzk5v26fssPBkeJVOOdUSP Dz7z5t2FYq/H/vVAaCr28SnWo7kUfyjeH+KmsSCCzZpp9g6xKObF31v4REJvPLpwxbIz hQbiwNXegyBNurvlsAvHTbsJmbTYglE4ujgHCx3XwEqKopXX8IEpmubaLabVIok6sUw5 7rvuLIqUUqxE7hxwEG8HEo4JgbSqXZrscQ0bdLcYAW2aBteptJ3tc4BsuCMhASnAnn/R ekq7eWpBh9TBDMjgic2lf1A9NjeSwJFqqfjluyRw4MNySGESwYlqsYHymi754q6ax310 sGqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=0jLCRbOfP8b7p8Z2vRhheskl97O3VX3ZegE0fpM6SkE=; b=G2vsiOGWvI+S0Qs+O0EYEErbxKUCuedelnJY/kDw9Ig7KRpBWbcfxD9ytLBYc4yw5W AQmbnks4zxSKsAWJTzBzgZmCc+4YBM7YI4e1GAY8jDEtD/ijHwJ10/K23t+GVRxZLCbg UmqwpZU3NIGNTM6IWCxIGct7OaoOiR6XDdbUQaiXMtOUPpYMk5QB6Ftx0ZRbaU9/i07s wTM2gL7nZT84S/3+O8jN/9VXf6OkeI4wMyx1lAMxjq+PKIDA68snkGxtCbIdi8pbvLtC m0yTizFbNeqEAmbGmVE7z0hA7jqS3qx5Ad0SQ4POSGSmvvnnGBlujn9affOJ9yrizxz+ CmRA== X-Gm-Message-State: AOAM530Ja+D9lPim4YoVBOPRiAMqOU2c+gTl7Jwff//PhfiK9NoR+l3j nHwaNWzU3ycHf15sz4684QepcEBNE6SkB0qZ X-Google-Smtp-Source: ABdhPJzU6kLdeLQQfpsDAcLNQQ4HiSMr6+D5u6YHY7L6mG2JQa5PzbaMIx/twD0L60ahBHBe4xCf7A== X-Received: by 2002:a4a:d0ce:: with SMTP id u14mr5689275oor.36.1616259445025; Sat, 20 Mar 2021 09:57:25 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v3 for-6.0 2/2] tcg: Workaround macOS 11.2 mprotect bug Date: Sat, 20 Mar 2021 10:57:20 -0600 Message-Id: <20210320165720.1813545-3-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210320165720.1813545-1-richard.henderson@linaro.org> References: <20210320165720.1813545-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::c30; envelope-from=richard.henderson@linaro.org; helo=mail-oo1-xc30.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=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: r.bolshakov@yadro.com, j@getutm.app Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" There's a change in mprotect() behaviour [1] in the latest macOS on M1 and it's not yet clear if it's going to be fixed by Apple. As a short-term fix, ignore failures setting up the guard pages. [1] https://gist.github.com/hikalium/75ae822466ee4da13cbbe486498a191f Buglink: https://bugs.launchpad.net/qemu/+bug/1914849 Signed-off-by: Richard Henderson Reviewed-by: Roman Bolshakov Tested-by: Roman Bolshakov --- tcg/tcg.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tcg/tcg.c b/tcg/tcg.c index 88c9e6f8a4..1fbe0b686d 100644 --- a/tcg/tcg.c +++ b/tcg/tcg.c @@ -864,11 +864,15 @@ void tcg_region_init(void) */ for (i =3D 0; i < region.n; i++) { void *start, *end; - int rc; =20 tcg_region_bounds(i, &start, &end); - rc =3D qemu_mprotect_none(end, page_size); - g_assert(!rc); + + /* + * macOS 11.2 has a bug (Apple Feedback FB8994773) in which mprote= ct + * rejects a permission change from RWX -> NONE. Guard pages are + * nice for bug detection but are not essential; ignore any failur= e. + */ + (void)qemu_mprotect_none(end, page_size); } =20 tcg_region_trees_init(); --=20 2.25.1