{"id":2230836,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230836/?format=json","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=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":"<20260430054906.94431-4-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=json","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=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/2230836/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230836/checks/","tags":{},"headers":{"Return-Path":"\n ","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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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 \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"]}