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Sat, 23 May 2026 04:15:17 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: kvm@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan , Harsh Prateek Bora , Christophe Leroy , Venkat Rao Bagalkote , Nicholas Piggin , Misbah Anjum N , Anushree Mathur , Michael Ellerman , linux-kernel@vger.kernel.org, "Ritesh Harjani (IBM)" Subject: [RFC v2 5/5] KVM: selftests: Print the vcpu_id when KVM_CREATE_VCPU ioctl fails Date: Sat, 23 May 2026 16:44:24 +0530 Message-ID: <12184d5eda089814659d5a861b3ebc30d42733a3.1779524962.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Print the vcpu_id and errno when the KVM_CREATE_VCPU ioctl fails, for debug purposes. This helped in debugging an issue with KVM on PowerVM, where KVM_CREATE_VCPU only supports max 2048 vcpus, because the PAPR_HCALL H_GUEST_CREATE_VCPU ("Documentation/arch/powerpc/kvm-nested.rst") supports only up to 0-2047 vcpu_id. However KVM_CAP_MAX_VCPUS capability extension always reports max_vcpus as NR_CPUS of the host. Signed-off-by: Ritesh Harjani (IBM) --- tools/testing/selftests/kvm/lib/kvm_util.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 0dc67c1502cf..6a0ee6803623 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -1354,6 +1354,9 @@ struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, u32 vcpu_id) vcpu->vm = vm; vcpu->id = vcpu_id; vcpu->fd = __vm_ioctl(vm, KVM_CREATE_VCPU, (void *)(unsigned long)vcpu_id); + if (vcpu->fd < 0) + pr_info("Failed KVM_CREATE_VCPU for vcpu_id %u with errno %d\n", + vcpu_id, errno); TEST_ASSERT_VM_VCPU_IOCTL(vcpu->fd >= 0, KVM_CREATE_VCPU, vcpu->fd, vm); TEST_ASSERT(vcpu_mmap_sz() >= sizeof(*vcpu->run), "vcpu mmap size " -- 2.39.5