[{"id":3682783,"web_url":"http://patchwork.ozlabs.org/comment/3682783/","msgid":"<87h5owif7q.fsf@suse.de>","list_archive_url":null,"date":"2026-04-27T15:40:41","subject":"Re: [PATCH] tests/qtest: Make qtest_get_arch() cleverer","submitter":{"id":85343,"url":"http://patchwork.ozlabs.org/api/people/85343/","name":"Fabiano Rosas","email":"farosas@suse.de"},"content":"Peter Maydell writes:\n\n> The qtest_get_arch() function tries to determine the architecture\n> under test by extracting it from the binary name as provided in\n> QTEST_QEMU_BINARY. The current logic finds the last '-' in the\n> string and assumes everything beyond it is the architecture name.\n> Although we also look for the substring \"-system-\", the only effect\n> this check has is that we will exit with an error if it is not\n> present.\n>\n> Because the logic at the moment is very simplistic, although\n> it is possible to provide more complex commands than a bare\n> QEMU binary path, such as:\n> QTEST_QEMU_BINARY='rr record ./qemu-system-x86_64'\n> it is not possible to provide extra arguments to QEMU, such as:\n> QTEST_QEMU_BINARY='./qemu-system-x86_64 -d trace:foo'\n>\n> Because the \"-system-\" check and the \"find the architecture\" check\n> are not the same, the latter example will pass the \"we found\n> -system-\" check and not notice that the \"architecture name\" it has\n> found starts further on in the string; so rather than printing an\n> error it will return \"d trace:foo\" to the test.\n>\n> Improve the \"find the architecture name\" logic to look for the\n> rightmost occurrence of the substring \"-system-\" in\n> QTEST_QEMU_BINARY, and take the architecture name as starting there\n> and continuing until the first whitespace character or the end of the\n> string.\n>\n> Because we now need to potentially modify the environment variable\n> string to terminate the architecture name if it is not the last part\n> of the string, we make a copy of it which we cache in a static\n> variable. This lets us avoid having to modify all the callers to get\n> them to take ownership of the returned string.\n>\n> Signed-off-by: Peter Maydell \n> ---\n> I wanted to be able to pass trace arguments to a QEMU to help\n> debug a failing test; in the past I've done this by writing\n> a little wrapper shell script with the right shaped name, but\n> we can do better than that.\n>\n\nThere's QTEST_TRACE which can inject any command line option if you give\nit a tracepoint name as first string:\n\nQTEST_TRACE=\"cpu_reset -d guest_errors\"\n\nMaybe we should just rename it to QTEST_QEMU_ARGS.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=R+FTWhx5;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=N9rWT3iW;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=R+FTWhx5;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=N9rWT3iW;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1777304448;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:content-type:content-type:\n in-reply-to:in-reply-to:references:references;\n bh=/uiYnWu1b4rX/JrqXNIc1s4aISJjoa2VVVRvrGImHqE=;\n b=N9rWT3iWX23ahOdy3PtzNKgGO89678PGYI53Sd60BKXAqRoNqEJnvUjN6RDfES9MF016Of\n wYmq/9n+/JNiXgBA=="],"From":"Fabiano Rosas ","To":"Peter Maydell , qemu-devel@nongnu.org","Cc":"Laurent Vivier , Paolo Bonzini ","Subject":"Re: [PATCH] tests/qtest: Make qtest_get_arch() cleverer","In-Reply-To":"<20260427150007.1185559-1-peter.maydell@linaro.org>","References":"<20260427150007.1185559-1-peter.maydell@linaro.org>","Date":"Mon, 27 Apr 2026 12:40:41 -0300","Message-ID":"<87h5owif7q.fsf@suse.de>","MIME-Version":"1.0","Content-Type":"text/plain","X-Spamd-Result":"default: False [-4.50 / 50.00]; BAYES_HAM(-2.99)[99.97%];\n NEURAL_HAM_LONG(-1.00)[-1.000];\n R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n NEURAL_HAM_SHORT(-0.20)[-1.000]; 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The current logic finds the last '-' in the\n> > string and assumes everything beyond it is the architecture name.\n> > Although we also look for the substring \"-system-\", the only effect\n> > this check has is that we will exit with an error if it is not\n> > present.\n> >\n> > Because the logic at the moment is very simplistic, although\n> > it is possible to provide more complex commands than a bare\n> > QEMU binary path, such as:\n> > QTEST_QEMU_BINARY='rr record ./qemu-system-x86_64'\n> > it is not possible to provide extra arguments to QEMU, such as:\n> > QTEST_QEMU_BINARY='./qemu-system-x86_64 -d trace:foo'\n> >\n> > Because the \"-system-\" check and the \"find the architecture\" check\n> > are not the same, the latter example will pass the \"we found\n> > -system-\" check and not notice that the \"architecture name\" it has\n> > found starts further on in the string; so rather than printing an\n> > error it will return \"d trace:foo\" to the test.\n> >\n> > Improve the \"find the architecture name\" logic to look for the\n> > rightmost occurrence of the substring \"-system-\" in\n> > QTEST_QEMU_BINARY, and take the architecture name as starting there\n> > and continuing until the first whitespace character or the end of the\n> > string.\n> >\n> > Because we now need to potentially modify the environment variable\n> > string to terminate the architecture name if it is not the last part\n> > of the string, we make a copy of it which we cache in a static\n> > variable. This lets us avoid having to modify all the callers to get\n> > them to take ownership of the returned string.\n> >\n> > Signed-off-by: Peter Maydell \n> > ---\n> > I wanted to be able to pass trace arguments to a QEMU to help\n> > debug a failing test; in the past I've done this by writing\n> > a little wrapper shell script with the right shaped name, but\n> > we can do better than that.\n> >\n>\n> There's QTEST_TRACE which can inject any command line option if you give\n> it a tracepoint name as first string:\n>\n> QTEST_TRACE=\"cpu_reset -d guest_errors\"\n>\n> Maybe we should just rename it to QTEST_QEMU_ARGS.\n\nThat might also be useful. It would also be good to document\nall these environment variables that you can use to help\nin debugging qtests...\n\n-- PMM","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=mX9+A9tF;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g47ss6ZRCz1yHv\n\tfor ; Tue, 28 Apr 2026 02:13:53 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wHOaV-0004pR-0z; 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Mon, 27 Apr 2026\n 09:13:30 -0700 (PDT)","MIME-Version":"1.0","References":"<20260427150007.1185559-1-peter.maydell@linaro.org>\n <87h5owif7q.fsf@suse.de>","In-Reply-To":"<87h5owif7q.fsf@suse.de>","From":"Peter Maydell ","Date":"Mon, 27 Apr 2026 17:13:16 +0100","X-Gm-Features":"AVHnY4LnMuPaZ2cQo4-Cla25bzhKWXe21xdvaeuwhoAEVfbcT95iyd3r9zicUVE","Message-ID":"\n ","Subject":"Re: [PATCH] tests/qtest: Make qtest_get_arch() cleverer","To":"Fabiano Rosas ","Cc":"qemu-devel@nongnu.org, Laurent Vivier ,\n Paolo Bonzini ","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::b135;\n envelope-from=peter.maydell@linaro.org; helo=mail-yx1-xb135.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}}]