{"id":2230839,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230839/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430054906.94431-7-amachhiw@linux.ibm.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.1/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<20260430054906.94431-7-amachhiw@linux.ibm.com>","date":"2026-04-30T05:49:05","name":"[6/6] KVM: PPC: Document KVM_PPC_GET_COMPAT_CAPS ioctl","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"7f129aad063a3bfacb80d0e01296721c50e804e9","submitter":{"id":87864,"url":"http://patchwork.ozlabs.org/api/1.1/people/87864/?format=json","name":"Amit Machhiwal","email":"amachhiw@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430054906.94431-7-amachhiw@linux.ibm.com/mbox/","series":[{"id":502205,"url":"http://patchwork.ozlabs.org/api/1.1/series/502205/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=502205","date":"2026-04-30T05:48:59","name":"KVM: PPC: Handle CPU compatibility mode for nested guests","version":1,"mbox":"http://patchwork.ozlabs.org/series/502205/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230839/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230839/checks/","tags":{},"headers":{"Return-Path":"\n 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","To":"linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan ","Cc":"Amit Machhiwal ,\n Vaibhav Jain ,\n Paolo Bonzini , Jonathan Corbet ,\n Shuah Khan , kvm@vger.kernel.org,\n linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org","Subject":"[PATCH 6/6] KVM: PPC: Document KVM_PPC_GET_COMPAT_CAPS ioctl","Date":"Thu, 30 Apr 2026 11:19:05 +0530","Message-ID":"<20260430054906.94431-7-amachhiw@linux.ibm.com>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260430054906.94431-1-amachhiw@linux.ibm.com>","References":"<20260430054906.94431-1-amachhiw@linux.ibm.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-TM-AS-GCONF":"00","X-Proofpoint-ORIG-GUID":"PY1Pk5C2qoENucOkMV8Y5LISX-Mrjos1","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDMwMDA1NSBTYWx0ZWRfXxz0Q8GlnGWtM\n 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definitions=2026-04-30_01,2026-04-28_01,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n clxscore=1015 suspectscore=0 adultscore=0 lowpriorityscore=0 phishscore=0\n spamscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 impostorscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604300055","X-Spam-Status":"No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"},"content":"Add documentation for the KVM_PPC_GET_COMPAT_CAPS ioctl to the KVM API\ndocumentation.\n\nThe ioctl exposes host processor compatibility modes supported for\nnested KVM guests on PowerPC systems.\n\nSigned-off-by: Amit Machhiwal \n---\n Documentation/virt/kvm/api.rst | 35 ++++++++++++++++++++++++++++++++++\n 1 file changed, 35 insertions(+)","diff":"diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst\nindex 52bbbb553ce1..7a10c3c6cbf1 100644\n--- a/Documentation/virt/kvm/api.rst\n+++ b/Documentation/virt/kvm/api.rst\n@@ -6555,6 +6555,41 @@ KVM_S390_KEYOP_SSKE\n \n .. _kvm_run:\n \n+4.145 KVM_PPC_GET_COMPAT_CAPS\n+-----------------------------\n+:Capability: KVM_CAP_PPC_COMPAT_CAPS\n+:Architectures: powerpc\n+:Type: vm ioctl\n+:Parameters: struct kvm_ppc_compat_caps (out)\n+:Returns:\n+\t0 on successful completion,\n+\t-EFAULT if ``struct kvm_ppc_compat_caps`` cannot be written\n+\n+IBM POWER system server-based processors provide a compatibility mode feature\n+where an Nth generation processor can operate in modes consistent with earlier\n+generations such as (N-1) and (N-2).\n+\n+This ioctl provides userspace with information about the CPU compatibility modes\n+supported by the current host processor for booting the nested KVM guests on\n+PowerNV (KVM nested APIv1) and PowerVM (KVM nested APIv2) platforms.\n+\n+::\n+\n+ struct kvm_ppc_compat_caps {\n+ __u32 flags;\n+ __u64 compat_capabilities; /* Capabilities supported by the host */\n+ };\n+\n+The ``compat_capabilities`` bit field describes the processor compatibility\n+modes supported by the host. For example, the following bits indicate support\n+for specific processor modes.\n+\n+::\n+\n+ bit 1: KVM guests can run in Power9 processor mode\n+ bit 2: KVM guests can run in Power10 processor mode\n+ bit 3: KVM guests can run in Power11 processor mode\n+\n 5. The kvm_run structure\n ========================\n \n","prefixes":["6/6"]}