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GET /api/1.1/patches/2230836/?format=api
{ "id": 2230836, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230836/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430054906.94431-4-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": "<20260430054906.94431-4-amachhiw@linux.ibm.com>", "date": "2026-04-30T05:49:02", "name": "[3/6] KVM: PPC: Wire up KVM_PPC_GET_COMPAT_CAPS ioctl", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "312624a8e5647ce939e3b5548a66348e92368137", "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/20260430054906.94431-4-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/2230836/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230836/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20335-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=EUvm/qjg;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com;\n dkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=EUvm/qjg; dkim-atps=neutral;\n spf=pass (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com;\n envelope-from=amachhiw@linux.ibm.com;\n receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n\t:content-transfer-encoding:date:from:in-reply-to:message-id\n\t:mime-version:references:subject:to; s=pp1; bh=zux2iqmTVMoxCwd+G\n\tglwc5wsABaBBuAJANF/lFJMKzo=; b=EUvm/qjgmAo0X+WglVWZuPQxUssZB4o9J\n\tZq2BC4XmjtJaaXqBKy3cCntJecGEaCAC3M0xCZMHmrem7xBZQWT3fIAzqtnyJSuK\n\tky0WI5r4ghEjjmfx04C3/hw97Ps7TZBH3+jyqphgltsNFSlitxjjmbaSGPuZlWwl\n\th9uEdAatEAZvwcnCgiQMZIdejQSTH4pKRhDg0JgyCOpePIXffzntmcJqrYHVo84B\n\tYp0lrxI+2C8+Fu64hBI7YzuYuA85Ur1qz7RWQj9Tf3AUZ2WaQ4y3RQt+cv2GeOi7\n\tZ/RtyS//aL/4EVHBgYrZ4XKGXMKPkkY09H7qziKmVjhlXNiDRU5Gg==", "From": "Amit 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 Nicholas Piggin <npiggin@gmail.com>,\n Michael Ellerman <mpe@ellerman.id.au>,\n \"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>,\n kvm@vger.kernel.org, linux-kernel@vger.kernel.org", "Subject": "[PATCH 3/6] KVM: PPC: Wire up KVM_PPC_GET_COMPAT_CAPS ioctl", "Date": "Thu, 30 Apr 2026 11:19:02 +0530", "Message-ID": "<20260430054906.94431-4-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": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Proofpoint-Reinject": "loops=2 maxloops=12", "X-Proofpoint-ORIG-GUID": "N0YytoSHj77IpD60dC_KIuO930sp6Edt", "X-Authority-Analysis": "v=2.4 cv=Ft81OWrq c=1 sm=1 tr=0 ts=69f2edab cx=c_pps\n a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=MxX2ZhQXYH6PMiHjArUA:9", "X-Proofpoint-GUID": "sw-Vb_Bk0h4TjseRr9opP-Lf-6-iNc9W", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDMwMDA1NSBTYWx0ZWRfX3gmRQYD5fkIn\n vNhXoFnroncb91SiAm+7A94HI6TYd0LYMaN+0mAutviOSDPcqnYi7Lvvi4cD7CDKx/zT5bpvdd4\n Qg+J+onkN3h1rrC37IuUxjxIIe2o0fb8l3pObujOR77Tmcy+55PNZ+QM5PlVGHvyH66bmHO+4Jr\n cOG8npEIqUFBR5w228nYrby0eA1Uo/0ncLdYLDgub92PFbaenb/SkkgoeaXXJVWrkpxlgJ9vlre\n JAOz/G8ljjj+ENBFJcN9CUnKBdfyfItfSrutBp1+cpHDMeExuJqdSA7VusNcluwS8rLIRgKE/cq\n Ug0WZcOawHkYKG4YxEfMuPMDmtJnJJWz9UjzgU7QVdkC17Y3is+PUVR8l6AnVhy6T2nqIvB9547\n BVeTaADZrR4hosWPH/gExMHYh/mUiEmtjywSouz8c1Bch+uhap9kwUiOpxwTsPLJ16n8b3h5ghu\n 9EMJ2Lw0yGAMJPwZ6fQ==", "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 priorityscore=1501 lowpriorityscore=0 bulkscore=0 spamscore=0 impostorscore=0\n clxscore=1015 malwarescore=0 phishscore=0 suspectscore=0 adultscore=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 handling for KVM_PPC_GET_COMPAT_CAPS in kvm_arch_vm_ioctl() and\nadvertise support via KVM_CAP_PPC_COMPAT_CAPS.\n\nThe ioctl retrieves host CPU compatibility capabilities via a\nPowerPC-specific backend implementation when available. If the\ncapability is not supported, the ioctl returns success with no\ncapabilities set, allowing userspace to fall back gracefully.\n\nSigned-off-by: Amit Machhiwal <amachhiw@linux.ibm.com>\n---\n arch/powerpc/include/asm/kvm_ppc.h | 1 +\n arch/powerpc/kvm/powerpc.c | 19 +++++++++++++++++++\n 2 files changed, 20 insertions(+)", "diff": "diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h\nindex 0953f2daa466..cadfb839e836 100644\n--- a/arch/powerpc/include/asm/kvm_ppc.h\n+++ b/arch/powerpc/include/asm/kvm_ppc.h\n@@ -319,6 +319,7 @@ struct kvmppc_ops {\n \tbool (*hash_v3_possible)(void);\n \tint (*create_vm_debugfs)(struct kvm *kvm);\n \tint (*create_vcpu_debugfs)(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry);\n+\tint (*get_compat_cpu_ver)(struct kvm_ppc_compat_caps *host_caps);\n };\n \n extern struct kvmppc_ops *kvmppc_hv_ops;\ndiff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c\nindex 00302399fc37..f35017d83d77 100644\n--- a/arch/powerpc/kvm/powerpc.c\n+++ b/arch/powerpc/kvm/powerpc.c\n@@ -697,6 +697,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)\n \t\t\t}\n \t\t}\n \t\tbreak;\n+#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE)\n+\tcase KVM_CAP_PPC_COMPAT_CAPS:\n+\t\tif (kvmhv_on_pseries())\n+\t\t\tr = 1;\n+\t\tbreak;\n+#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */\n \tdefault:\n \t\tr = 0;\n \t\tbreak;\n@@ -2463,6 +2469,19 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n \t\tr = kvm->arch.kvm_ops->svm_off(kvm);\n \t\tbreak;\n \t}\n+\tcase KVM_PPC_GET_COMPAT_CAPS: {\n+\t\tstruct kvm_ppc_compat_caps host_caps;\n+\n+\t\tmemset(&host_caps, 0, sizeof(host_caps));\n+\t\tif (!kvm->arch.kvm_ops->get_compat_cpu_ver)\n+\t\t\tgoto out;\n+\n+\t\tr = kvm->arch.kvm_ops->get_compat_cpu_ver(&host_caps);\n+\t\tif (!r && copy_to_user(argp, &host_caps,\n+\t\t\t\t sizeof(host_caps)))\n+\t\t\tr = -EFAULT;\n+\t\tbreak;\n+\t}\n \tdefault: {\n \t\tstruct kvm *kvm = filp->private_data;\n \t\tr = kvm->arch.kvm_ops->arch_vm_ioctl(filp, ioctl, arg);\n", "prefixes": [ "3/6" ] }