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Wed, 10 Jun 2026 05:48:06 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: kvm@vger.kernel.org, Paolo Bonzini Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Michael Ellerman , Christophe Leroy , Anushree Mathur , Venkat Rao Bagalkote , Harsh Prateek Bora , Sean Christopherson , Ackerley Tng , Christian Borntraeger , Claudio Imbrenda , "Ritesh Harjani (IBM)" Subject: [PATCH v3 RESEND 05/10] KVM: selftests: Print the vcpu_id when KVM_CREATE_VCPU ioctl fails Date: Wed, 10 Jun 2026 18:17:21 +0530 Message-ID: <2d2c46be7f051c7f1c645afaec67f57067d37a81.1781093720.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 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index e00a25f59416..6319e2037882 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -1354,6 +1354,13 @@ 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) { + int saved_errno = errno; + + pr_info("Failed KVM_CREATE_VCPU for vcpu_id %u with errno %d\n", + vcpu_id, saved_errno); + errno = saved_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 " -- 2.50.1 (Apple Git-155)