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Thu, 12 Mar 2026 08:05:51 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.45.242.12]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 556D430002D6; Thu, 12 Mar 2026 08:05:51 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id E9E7921E6937; Thu, 12 Mar 2026 09:05:48 +0100 (CET) From: Markus Armbruster To: Thomas Huth Cc: Peter Maydell , qemu-devel@nongnu.org, Paolo Bonzini , Daniel P. =?utf-8?Q?Berrang=C3=A9?= , Peter Xu , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= Subject: Re: -device T,help crashes In-Reply-To: <2bdcb31f-b53b-44eb-ae70-b36e73cdad1c@redhat.com> (Thomas Huth's message of "Wed, 11 Mar 2026 16:14:35 +0100") References: <87pl5abgpl.fsf@pond.sub.org> <2bdcb31f-b53b-44eb-ae70-b36e73cdad1c@redhat.com> Date: Thu, 12 Mar 2026 09:05:48 +0100 Message-ID: <87jyvhzd43.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Thomas Huth writes: > On 11/03/2026 15.55, Peter Maydell wrote: >> On Wed, 11 Mar 2026 at 14:10, Markus Armbruster wrote: >>> >>> Watch this: >>> >>> $ qemu-system-aarch64 -S -display none -M virt -device acpi-ged,help >>> qemu-system-aarch64: ../hw/core/qdev.c:858: qdev_get_machine: Assertion `dev' failed. >>> >>> A number of devices crash this way: >>> >>> * acpi-ged (aarch64 arm i386 loongarch64 x86_64) >>> * fsl-imx6 (aarch64 arm) >>> * fsl-imx7 (aarch64 arm) >>> * fsl-imx8mp (aarch64) >>> * microchip.pfsoc (riscv64) >>> * riscv.sifive.e.soc (riscv32 riscv64) >>> * xlnx-zynqmp (aarch64) >> >> Largely speaking these are pretty useless to try to create on >> the command line, of course... > > Agreed, but note that you can also query help for non-user-creatable devices > normally, e.g.: > > $ ./qemu-system-x86_64 -device port92 > qemu-system-x86_64: -device port92: Parameter 'driver' expects a pluggable > device type > $ ./qemu-system-x86_64 -device port92,help > port92 options: > a20[0]=> > port92[0]=> Correct. QOM introspection needs to create and destroy an object, and this must effectively be a no-op. I don't like that part of its design, but it's what we got. > ... so we likely should fix the crashes anyway, even if we decide to mark > the devices with user_creatable = false. In fact, the devices mentioned above are all marked already.