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Iglesias" , Ruslan_Ruslichenko@epam.com, Paolo Bonzini , Zhao Liu , Yanan Wang , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH 18/27] hw/core/machine: add '-hw-dtb' option for machine Date: Mon, 26 Jan 2026 18:43:04 +0100 Message-ID: <20260126174313.1418150-19-ruslichenko.r@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260126174313.1418150-1-ruslichenko.r@gmail.com> References: <20260126174313.1418150-1-ruslichenko.r@gmail.com> 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=2a00:1450:4864:20::42e; envelope-from=ruslichenko.r@gmail.com; helo=mail-wr1-x42e.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, FREEMAIL_FROM=0.001, 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: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1769449887463154100 Content-Type: text/plain; charset="utf-8" From: Ruslan Ruslichenko Add new '-hw-dtb' command-line option and corresponding MachineState property. The 'hw-dtb' option allows to specify a Device tree binary with hardware description which Qemu should emulate. Signed-off-by: Ruslan Ruslichenko --- hw/core/machine.c | 19 +++++++++++++++++++ include/hw/core/boards.h | 1 + qemu-options.hx | 9 +++++++++ system/vl.c | 3 +++ 4 files changed, 32 insertions(+) diff --git a/hw/core/machine.c b/hw/core/machine.c index 6411e68856..fc04cf75c0 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -378,6 +378,20 @@ static void machine_set_dtb(Object *obj, const char *v= alue, Error **errp) ms->dtb =3D g_strdup(value); } =20 +static char *machine_get_hw_dtb(Object *obj, Error **errp) +{ + MachineState *ms =3D MACHINE(obj); + + return g_strdup(ms->hw_dtb); +} + +static void machine_set_hw_dtb(Object *obj, const char *value, Error **err= p) +{ + MachineState *ms =3D MACHINE(obj); + + ms->hw_dtb =3D g_strdup(value); +} + static char *machine_get_dumpdtb(Object *obj, Error **errp) { MachineState *ms =3D MACHINE(obj); @@ -1287,6 +1301,11 @@ static void machine_initfn(Object *obj) ms->ram_size =3D mc->default_ram_size; ms->maxram_size =3D mc->default_ram_size; =20 + object_property_add_str(obj, "hw-dtb", + machine_get_hw_dtb, machine_set_hw_dtb); + object_property_set_description(obj, "hw-dtb", + "A device tree used to describe the hardware to QEMU."= ); + if (mc->nvdimm_supported) { ms->nvdimms_state =3D g_new0(NVDIMMState, 1); object_property_add_bool(obj, "nvdimm", diff --git a/include/hw/core/boards.h b/include/hw/core/boards.h index 07f8938752..c28c505bb6 100644 --- a/include/hw/core/boards.h +++ b/include/hw/core/boards.h @@ -402,6 +402,7 @@ struct MachineState { =20 void *fdt; char *dtb; + char *hw_dtb; char *dumpdtb; int phandle_start; char *dt_compatible; diff --git a/qemu-options.hx b/qemu-options.hx index bd014a3244..6dd3e04e38 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4492,6 +4492,15 @@ SRST(initrd) =20 ERST =20 +DEF("hw-dtb", HAS_ARG, QEMU_OPTION_hw_dtb, \ + "-hw-dtb file use 'file' as device tree image\n", QEMU_ARCH_ALL) +SRST +``-hw-dtb file`` + Use as a device tree binary (dtb) image used to create the + emulated machine. This dtb will not be passed to the kernel, use -dtb + for that. +ERST + DEF("dtb", HAS_ARG, QEMU_OPTION_dtb, \ "-dtb file use 'file' as device tree image\n", QEMU_ARCH_ALL) SRST diff --git a/system/vl.c b/system/vl.c index aa9a155041..c890da586c 100644 --- a/system/vl.c +++ b/system/vl.c @@ -3020,6 +3020,9 @@ void qemu_init(int argc, char **argv) case QEMU_OPTION_dtb: qdict_put_str(machine_opts_dict, "dtb", optarg); break; + case QEMU_OPTION_hw_dtb: + qdict_put_str(machine_opts_dict, "hw-dtb", optarg); + break; case QEMU_OPTION_cdrom: drive_add(IF_DEFAULT, 2, optarg, CDROM_OPTS); break; --=20 2.43.0