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Thu, 30 Apr 2026 05:50:27 +0000 (GMT) Received: from localhost.localdomain (unknown [9.39.18.70]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 30 Apr 2026 05:50:27 +0000 (GMT) From: Amit Machhiwal To: linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan Cc: Amit Machhiwal , Vaibhav Jain , Nicholas Piggin , Michael Ellerman , "Christophe Leroy (CS GROUP)" , 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=MxX2ZhQXYH6PMiHjArUA:9 X-Proofpoint-GUID: sw-Vb_Bk0h4TjseRr9opP-Lf-6-iNc9W X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDMwMDA1NSBTYWx0ZWRfX3gmRQYD5fkIn vNhXoFnroncb91SiAm+7A94HI6TYd0LYMaN+0mAutviOSDPcqnYi7Lvvi4cD7CDKx/zT5bpvdd4 Qg+J+onkN3h1rrC37IuUxjxIIe2o0fb8l3pObujOR77Tmcy+55PNZ+QM5PlVGHvyH66bmHO+4Jr cOG8npEIqUFBR5w228nYrby0eA1Uo/0ncLdYLDgub92PFbaenb/SkkgoeaXXJVWrkpxlgJ9vlre JAOz/G8ljjj+ENBFJcN9CUnKBdfyfItfSrutBp1+cpHDMeExuJqdSA7VusNcluwS8rLIRgKE/cq Ug0WZcOawHkYKG4YxEfMuPMDmtJnJJWz9UjzgU7QVdkC17Y3is+PUVR8l6AnVhy6T2nqIvB9547 BVeTaADZrR4hosWPH/gExMHYh/mUiEmtjywSouz8c1Bch+uhap9kwUiOpxwTsPLJ16n8b3h5ghu 9EMJ2Lw0yGAMJPwZ6fQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-30_01,2026-04-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 spamscore=0 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0 suspectscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604300055 Add handling for KVM_PPC_GET_COMPAT_CAPS in kvm_arch_vm_ioctl() and advertise support via KVM_CAP_PPC_COMPAT_CAPS. The ioctl retrieves host CPU compatibility capabilities via a PowerPC-specific backend implementation when available. If the capability is not supported, the ioctl returns success with no capabilities set, allowing userspace to fall back gracefully. Signed-off-by: Amit Machhiwal --- arch/powerpc/include/asm/kvm_ppc.h | 1 + arch/powerpc/kvm/powerpc.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 0953f2daa466..cadfb839e836 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -319,6 +319,7 @@ struct kvmppc_ops { bool (*hash_v3_possible)(void); int (*create_vm_debugfs)(struct kvm *kvm); int (*create_vcpu_debugfs)(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry); + int (*get_compat_cpu_ver)(struct kvm_ppc_compat_caps *host_caps); }; extern struct kvmppc_ops *kvmppc_hv_ops; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 00302399fc37..f35017d83d77 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -697,6 +697,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) } } break; +#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) + case KVM_CAP_PPC_COMPAT_CAPS: + if (kvmhv_on_pseries()) + r = 1; + break; +#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ default: r = 0; break; @@ -2463,6 +2469,19 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) r = kvm->arch.kvm_ops->svm_off(kvm); break; } + case KVM_PPC_GET_COMPAT_CAPS: { + struct kvm_ppc_compat_caps host_caps; + + memset(&host_caps, 0, sizeof(host_caps)); + if (!kvm->arch.kvm_ops->get_compat_cpu_ver) + goto out; + + r = kvm->arch.kvm_ops->get_compat_cpu_ver(&host_caps); + if (!r && copy_to_user(argp, &host_caps, + sizeof(host_caps))) + r = -EFAULT; + break; + } default: { struct kvm *kvm = filp->private_data; r = kvm->arch.kvm_ops->arch_vm_ioctl(filp, ioctl, arg); -- 2.50.1