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Sat, 23 May 2026 04:15:11 -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 4/5] KVM: PPC: selftests: powerpc enable kvm_create_max_vcpus test Date: Sat, 23 May 2026 16:44:23 +0530 Message-ID: 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 From: Nicholas Piggin powerpc's maximum permitted vCPU ID depends on the VM's SMT mode, and the maximum reported by KVM_CAP_MAX_VCPU_ID exceeds a simple non-SMT VM's limit. The powerpc KVM selftest port uses non-SMT VMs, so add a workaround to the kvm_create_max_vcpus test case to limit vCPU IDs to KVM_CAP_MAX_VCPUS on powerpc. Signed-off-by: Nicholas Piggin [Rebased to latest mainline tree] Signed-off-by: Ritesh Harjani (IBM) --- tools/testing/selftests/kvm/kvm_create_max_vcpus.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/testing/selftests/kvm/kvm_create_max_vcpus.c b/tools/testing/selftests/kvm/kvm_create_max_vcpus.c index c5310736ed06..a82c13d6cdf5 100644 --- a/tools/testing/selftests/kvm/kvm_create_max_vcpus.c +++ b/tools/testing/selftests/kvm/kvm_create_max_vcpus.c @@ -56,6 +56,15 @@ int main(int argc, char *argv[]) "KVM_MAX_VCPU_IDS (%d) must be at least as large as KVM_MAX_VCPUS (%d).", kvm_max_vcpu_id, kvm_max_vcpus); +#ifdef __powerpc64__ + /* + * powerpc has a particular format for the vcpu ID that depends on + * the guest SMT mode, and the max ID cap is too large for non-SMT + * modes, where the maximum ID is the same as the maximum vCPUs. + */ + kvm_max_vcpu_id = kvm_max_vcpus; +#endif + test_vcpu_creation(0, kvm_max_vcpus); if (kvm_max_vcpu_id > kvm_max_vcpus) -- 2.39.5