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b=dK137Gp8N8/x+KyQc6/NVoVzHB88Jd7kMKrFvQh/CKHmASDBx65nXX4iItcv5Wpwz3e9kT I+r/wiDHSmKTw+b/OY2TeSc0xkBe6nLCp2VpZSyGdDarLE53VHgPhbjdfvBtOr0a9kHYVf 6n5g11UF7JhGpGieBlQ/VNiwCIUPUVs= X-MC-Unique: F8hHA1UKNT6VGgOXsW10SA-1 Date: Wed, 20 Jan 2021 15:12:41 -0500 From: Eduardo Habkost To: qemu-devel@nongnu.org Subject: [PATCH] docs/system: Deprecate `-cpu ...,+feature,-feature` syntax Message-ID: <20210120201241.GR1227584@habkost.net> References: <20210119142207.3443123-1-david.edmondson@oracle.com> <20210119142207.3443123-2-david.edmondson@oracle.com> <20210119152056.GE1227584@habkost.net> <20210119163052.GG1227584@habkost.net> <20210120100803.GF3015589@redhat.com> <20210120161801.GP1227584@habkost.net> <20210120202134.4e0c4523@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210120202134.4e0c4523@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ehabkost@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline 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=63.128.21.124; envelope-from=ehabkost@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.167, 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_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Thomas Huth , Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , "Michael S. Tsirkin" , David Edmondson , Richard Henderson , qemu-devel@nongnu.org, Paolo Bonzini , Igor Mammedov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The ordering semantics of +feature/-feature is tricky and not obvious, and it requires a custom option parser. Deprecate that syntax so we can eventually remove the custom -cpu option parser and plus_features/minus_features global variables in i386. Signed-off-by: Eduardo Habkost Reviewed-by: David Edmondson Reviewed-by: Igor Mammedov --- docs/system/deprecated.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst index e20bfcb17a4..2c4b8d4b78b 100644 --- a/docs/system/deprecated.rst +++ b/docs/system/deprecated.rst @@ -127,6 +127,20 @@ Drives with interface types other than ``if=3Dnone`` a= re for onboard devices. It is possible to use drives the board doesn't pick up with -device. This usage is now deprecated. Use ``if=3Dnone`` instead. =20 +``-cpu`` ``+feature`` and ``-feature`` syntax (since 6.0.0) +''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +The ``-cpu ...,+feature`` and ``-cpu ...,-feature`` syntax for +enabling and disabling CPU features is deprecated. The ``-cpu +...,feature=3Don`` or ``-cpu ...,feature=3Doff`` should be used +instead. + +Note that the ordering semantics of ``-cpu ...,-feature,+feature`` +is different from ``-cpu ...,feature=3Doff,feature=3Don``. With the +former, the feature got disabled because ``-feature`` had +precedence, but with the latter the feature will be enabled +because options are applied in the order they appear. + =20 QEMU Machine Protocol (QMP) commands ------------------------------------ --=20 2.28.0