[{"id":3682922,"web_url":"http://patchwork.ozlabs.org/comment/3682922/","msgid":"","list_archive_url":null,"date":"2026-04-27T19:48:45","subject":"Re: [PATCH] qdev: test if DeviceListener is in use","submitter":{"id":5111,"url":"http://patchwork.ozlabs.org/api/people/5111/","name":"Peter Maydell","email":"peter.maydell@linaro.org"},"content":"On Mon, 27 Apr 2026 at 18:43, Jagannathan Raman wrote:\n>\n> Adds a function to test if a given DeviceListener object is in use. This\n> is necessary to confirm we're not unregistering an object that is not in\n> use, which results in a crash.\n>\n> Fixes a crash when we execute \"qom-list-properties\" QMP command on the\n> \"x-remote-object\":\n> https://www.mail-archive.com/qemu-devel@nongnu.org/msg1185472.html\n>\n> Signed-off-by: Jagannathan Raman \n> ---\n> hw/core/qdev.c | 5 +++++\n> hw/remote/remote-obj.c | 4 +++-\n> include/hw/core/qdev.h | 1 +\n> 3 files changed, 9 insertions(+), 1 deletion(-)\n>\n> diff --git a/hw/core/qdev.c b/hw/core/qdev.c\n> index e48616b2c6..97b09f6e7f 100644\n> --- a/hw/core/qdev.c\n> +++ b/hw/core/qdev.c\n> @@ -208,6 +208,11 @@ void device_listener_unregister(DeviceListener *listener)\n> QTAILQ_REMOVE(&device_listeners, listener, link);\n> }\n>\n> +bool device_listener_is_registered(DeviceListener *listener)\n> +{\n> + return QTAILQ_IN_USE(listener, link);\n> +}\n\nThe approach used by memory_listener_register() and\nmemory_listener_unregister() is that the latter is a\nno-op for a MemoryListener that's not currently\nregistered (we test for listener->address_space is NULL,\nand at the end of unregister we set it to NULL). Would\nit be possible to follow the same API pattern for\nDeviceListener rather than introducing an is_registered\nfunction ?\n\nthanks\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=rrg0eQUl;\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 4g4Dg22GL5z1yJX\n\tfor ; Tue, 28 Apr 2026 05:49:50 +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 1wHRx5-0006l3-P7; 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Mon, 27 Apr 2026\n 12:48:57 -0700 (PDT)","MIME-Version":"1.0","References":"<20260427162700.89750-1-jag.raman@oracle.com>","In-Reply-To":"<20260427162700.89750-1-jag.raman@oracle.com>","From":"Peter Maydell ","Date":"Mon, 27 Apr 2026 20:48:45 +0100","X-Gm-Features":"AVHnY4I8JTe1CW78ri5F-0PmZhWj7HrCMRC60d0QqdGrcgFo27BTKMZ6cxkDjSU","Message-ID":"\n ","Subject":"Re: [PATCH] qdev: test if DeviceListener is in use","To":"Jagannathan Raman ","Cc":"qemu-devel@nongnu.org, armbru@redhat.com,\n Paolo Bonzini ,\n =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= ,\n Elena Ufimtseva ","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::b131;\n envelope-from=peter.maydell@linaro.org; helo=mail-yx1-xb131.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"}},{"id":3682928,"web_url":"http://patchwork.ozlabs.org/comment/3682928/","msgid":"<3358ed92-143c-4e24-aa39-ddab4bcb00eb@oracle.com>","list_archive_url":null,"date":"2026-04-27T19:56:38","subject":"Re: [PATCH] qdev: test if DeviceListener is in use","submitter":{"id":71309,"url":"http://patchwork.ozlabs.org/api/people/71309/","name":"Jagannathan Raman","email":"jag.raman@oracle.com"},"content":"On 4/27/26 3:48 PM, Peter Maydell wrote:\n> On Mon, 27 Apr 2026 at 18:43, Jagannathan Raman wrote:\n>> Adds a function to test if a given DeviceListener object is in use. This\n>> is necessary to confirm we're not unregistering an object that is not in\n>> use, which results in a crash.\n>>\n>> Fixes a crash when we execute \"qom-list-properties\" QMP command on the\n>> \"x-remote-object\":\n>> https://www.mail-archive.com/qemu-devel@nongnu.org/msg1185472.html\n>>\n>> Signed-off-by: Jagannathan Raman\n>> ---\n>> hw/core/qdev.c | 5 +++++\n>> hw/remote/remote-obj.c | 4 +++-\n>> include/hw/core/qdev.h | 1 +\n>> 3 files changed, 9 insertions(+), 1 deletion(-)\n>>\n>> diff --git a/hw/core/qdev.c b/hw/core/qdev.c\n>> index e48616b2c6..97b09f6e7f 100644\n>> --- a/hw/core/qdev.c\n>> +++ b/hw/core/qdev.c\n>> @@ -208,6 +208,11 @@ void device_listener_unregister(DeviceListener *listener)\n>> QTAILQ_REMOVE(&device_listeners, listener, link);\n>> }\n>>\n>> +bool device_listener_is_registered(DeviceListener *listener)\n>> +{\n>> + return QTAILQ_IN_USE(listener, link);\n>> +}\n> The approach used by memory_listener_register() and\n> memory_listener_unregister() is that the latter is a\n> no-op for a MemoryListener that's not currently\n> registered (we test for listener->address_space is NULL,\n> and at the end of unregister we set it to NULL). Would\n> it be possible to follow the same API pattern for\n> DeviceListener rather than introducing an is_registered\n> function ?\nThanks, Peter! I believe sticking to the above pattern is better to remain\nconsistent with the existing MemoryListener implementation.\n\nMarc-Andre just published a patch which does something \nsimilar:https://patchew.org/QEMU/20260427-qom-tests-v1-0-c413f3605311@redhat.com/20260427-qom-tests-v1-9-c413f3605311@redhat.com/\n\nI'll follow up with him also.\n\nThanks,\nJag\n>\n> thanks\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=oracle.com header.i=@oracle.com header.a=rsa-sha256\n header.s=corp-2025-04-25 header.b=LlH/Ig4v;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com\n header.a=rsa-sha256 header.s=selector2-oracle-onmicrosoft-com\n header.b=lhuikpOm;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) 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