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Tue, 06 Oct 2026 03:30:15 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: kvm@vger.kernel.org, Sean Christopherson Cc: Paolo Bonzini , linuxppc-dev@lists.ozlabs.org, Michael Ellerman , Christophe Leroy , Anushree Mathur , Venkat Rao Bagalkote , Harsh Prateek Bora , Madhavan Srinivasan , Shrikanth Hegde , linux-kernel@vger.kernel.org, "Ritesh Harjani (IBM)" Subject: [PATCH v7 6/8] KVM: selftests: Skip kvm_create_max_vcpus on powerpc pseries LPAR Date: Tue, 6 Oct 2026 15:58:40 +0530 Message-Id: X-Mailer: git-send-email 2.39.5 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 On a PAPR LPAR, KVM_CREATE_VCPU is H_GUEST_CREATE_VCPU and KVM_CAP_MAX_VCPUS is only the vcpuId range but is not a guarantee from L0 i.e. because L0 Guest Management Space can be exhausted before that many vCPUs exist, so creating MAX_VCPUS is not a valid assert. So, skip the test when powerpc is pseries LPAR (running nested i.e. ibm,hypertas-functions is present). Signed-off-by: Ritesh Harjani (IBM) --- tools/testing/selftests/kvm/kvm_create_max_vcpus.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/kvm/kvm_create_max_vcpus.c b/tools/testing/selftests/kvm/kvm_create_max_vcpus.c index 1b95027d41ba..22279c638d06 100644 --- a/tools/testing/selftests/kvm/kvm_create_max_vcpus.c +++ b/tools/testing/selftests/kvm/kvm_create_max_vcpus.c @@ -39,6 +39,12 @@ int main(int argc, char *argv[]) int kvm_max_vcpu_id = kvm_check_cap(KVM_CAP_MAX_VCPU_ID); int kvm_max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS); + /* + * PowerPC's PAPR L0 does not guarantee KVM_CAP_MAX_VCPUS when running + * on pseries LPAR (nested kvm-on-powervm). + */ + TEST_REQUIRE(!kvm_is_ppc_pseries_lpar()); + pr_info("KVM_CAP_MAX_VCPU_ID: %d\n", kvm_max_vcpu_id); pr_info("KVM_CAP_MAX_VCPUS: %d\n", kvm_max_vcpus); -- 2.39.5