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GET /api/1.1/patches/2230839/?format=api
{ "id": 2230839, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230839/?format=api", "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=api", "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=api", "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=api", "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 <linuxppc-dev+bounces-20338-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], 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Machhiwal <amachhiw@linux.ibm.com>", "To": "linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan <maddy@linux.ibm.com>", "Cc": "Amit Machhiwal <amachhiw@linux.ibm.com>,\n Vaibhav Jain <vaibhav@linux.ibm.com>,\n Paolo Bonzini <pbonzini@redhat.com>, Jonathan Corbet <corbet@lwn.net>,\n Shuah Khan <skhan@linuxfoundation.org>, 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": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": 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kkjWF/5Shwi9Q3hqySQ12oh6BHNqfoYSCFC3pQsyD6TfqmDj1NbvuNEBJWVUYstsCDlSB4nx+zw\n g7MAWXZKl0nbR9kFJv5sd/CBlSZmuWMm+hzgSgZJ/bEOnE0CB/TsDcTkcjrwQjfOs+AcTi5cFEI\n ZI9N0NdjjPfRymOZu8w==", "X-Authority-Analysis": "v=2.4 cv=VZLH+lp9 c=1 sm=1 tr=0 ts=69f2edc3 cx=c_pps\n a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=fHGwRvExhQHp1Ic8jzwA:9", "X-Proofpoint-GUID": "PY1Pk5C2qoENucOkMV8Y5LISX-Mrjos1", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n 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 <amachhiw@linux.ibm.com>\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" ] }