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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.155.12; envelope-from=mark.caveayland@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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: 2.1.29 Precedence: list List-Id: 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 @nutanix.com) X-ZM-MESSAGEID: 1758816416985116600 Content-Type: text/plain; charset="utf-8" Following recent discussions on the mailing list, it has been decided that instead of mapping -cpu host and -cpu max to a suitable 32-bit x86 CPU, it is preferable to disallow them and use the existing valid_cpu_types validation logic so that an error is returned to the user instead. Signed-off-by: Mark Cave-Ayland Reviewed-by: Markus Armbruster --- hw/i386/isapc.c | 27 --------------------------- 1 file changed, 27 deletions(-) diff --git a/hw/i386/isapc.c b/hw/i386/isapc.c index 44f4a44672..6c35a397df 100644 --- a/hw/i386/isapc.c +++ b/hw/i386/isapc.c @@ -41,31 +41,6 @@ static void pc_init_isa(MachineState *machine) DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS]; int i; =20 - /* - * There is a small chance that someone unintentionally passes "-cpu m= ax" - * for the isapc machine, which will provide a much more modern 32-bit - * CPU than would be expected for an ISA-era PC. If the "max" cpu type= has - * been specified, choose the "best" 32-bit cpu possible which we cons= ider - * be the pentium3 (deliberately choosing an Intel CPU given that the - * default 486 CPU for the isapc machine is also an Intel CPU). - */ - if (!strcmp(machine->cpu_type, X86_CPU_TYPE_NAME("max"))) { - machine->cpu_type =3D X86_CPU_TYPE_NAME("pentium3"); - warn_report("-cpu max is invalid for isapc machine, using pentium3= "); - } - - /* - * Similarly if someone unintentionally passes "-cpu host" for the isa= pc - * machine then display a warning and also switch to the "best" 32-bit - * cpu possible which we consider to be the pentium3. This is because = any - * host CPU will already be modern than this, but it also ensures any - * newer CPU flags/features are filtered out for older guests. - */ - if (!strcmp(machine->cpu_type, X86_CPU_TYPE_NAME("host"))) { - machine->cpu_type =3D X86_CPU_TYPE_NAME("pentium3"); - warn_report("-cpu host is invalid for isapc machine, using pentium= 3"); - } - if (machine->ram_size > 3.5 * GiB) { error_report("Too much memory for this machine: %" PRId64 " MiB, " "maximum 3584 MiB", machine->ram_size / MiB); @@ -162,8 +137,6 @@ static void isapc_machine_options(MachineClass *m) X86_CPU_TYPE_NAME("pentium2"), X86_CPU_TYPE_NAME("pentium3"), X86_CPU_TYPE_NAME("qemu32"), - X86_CPU_TYPE_NAME("max"), - X86_CPU_TYPE_NAME("host"), NULL }; PCMachineClass *pcmc =3D PC_MACHINE_CLASS(m); --=20 2.43.0 From nobody Sun Sep 28 15:26:54 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.151.68; envelope-from=mark.caveayland@nutanix.com; helo=mx0a-002c1b01.pphosted.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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: 2.1.29 Precedence: list List-Id: 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 @nutanix.com) X-ZM-MESSAGEID: 1758816445087116600 Content-Type: text/plain; charset="utf-8" Add a new paragraph in the "Backwards compatibility" section documenting th= at the isapc machine is now restricted to 32-bit x86 CPUs, and -cpu host and -cpu max are no longer supported. Signed-off-by: Mark Cave-Ayland Reviewed-by: Markus Armbruster --- docs/about/deprecated.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index aa300bbd50..4c7000650d 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -514,6 +514,19 @@ available firmwares that are using the current (wrong)= name. The property is kept as is in 9.1, together with "riscv,delegation", to give more time for firmware developers to change their code. =20 +x86 "isapc" board restricted to 32-bit x86 CPUs (since 10.2) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +The "isapc" board represents a historical x86 ISA PC and is intended for +older 32-bit x86 CPU models, defaulting to a 486 CPU model. Previously it +was possible (but non-sensical) to specify a more modern x86 CPU, including +``-cpu host`` or ``-cpu max`` even if the features were incompatible with = many +of the intended guest OSs. + +Now the "isapc" board contains an explicit list of supported 32-bit x86 CPU +models. If the user requests an unsupported CPU model then an error messag= e is +returned indicating the available CPU models. + Migration --------- =20 --=20 2.43.0