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Tue, 28 Oct 2025 10:35:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGuJV/fNDosLI+4kYLXYP/ZE26uMxFED1RZQ5mPP8w5izpO32yraFWNs2YnuN089f4CjQU2+w== X-Received: by 2002:a05:6000:40d9:b0:427:665:e37f with SMTP id ffacd0b85a97d-429a7e36fe9mr3264897f8f.4.1761672920804; Tue, 28 Oct 2025 10:35:20 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Mark Cave-Ayland , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PULL 16/18] docs/about/deprecated.rst: document isapc deprecation for modern x86 CPU models Date: Tue, 28 Oct 2025 18:34:28 +0100 Message-ID: <20251028173430.2180057-17-pbonzini@redhat.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251028173430.2180057-1-pbonzini@redhat.com> References: <20251028173430.2180057-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.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, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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 @redhat.com) X-ZM-MESSAGEID: 1761673091374158500 From: Mark Cave-Ayland Add a new paragraph in the "Backwards compatibility" section documenting th= at using modern x86 CPU models with the isapc machine is deprecated, and will = be rejected in a future release. Signed-off-by: Mark Cave-Ayland Reviewed-by: Philippe Mathieu-Daud=C3=A9 Link: https://lore.kernel.org/r/20251023142926.964718-3-mark.caveayland@nut= anix.com Signed-off-by: Paolo Bonzini --- docs/about/deprecated.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index dacf2882e44..020610132ff 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -544,6 +544,20 @@ 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 use of modern 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. + +If the user requests a modern x86 CPU model (i.e. not one of ``486``, +``athlon``, ``kvm32``, ``pentium``, ``pentium2``, ``pentium3``or ``qemu32`= `) +a warning will be displayed until a future QEMU version when such CPUs will +be rejected. + Migration --------- =20 --=20 2.51.1