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Fri, 31 Jul 2026 10:06:22 -0700 (PDT) Date: Fri, 31 Jul 2026 10:06:07 -0700 Mime-Version: 1.0 X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260731170619.2620845-1-seanjc@google.com> Subject: [PATCH v2 00/12] KVM: selftests: Add more syscall wrappers, fix hardware_disable_test From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson Cc: Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260731_100626_559633_E58FA2B8 X-CRM114-Status: GOOD ( 12.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Buried in the middle of this is a fix for the hardware_disable_test where it can end up with a runtime of multiple minutes when running a preemptible kernels on a large NUMA system. Turns out my analysis/guess in v1 was wrong; the problem isn't direct CPU contention, it's that letting the workers do any amount of "real" work on any CPUs leads to pthread_create() slowdowns from the perspective of the caller. The vast, vast majority of the changes are adding kvm_xxx() syscall wrappers so that tests don't need to manually assert that a syscall succeeds (the hardware disable test had some ugly equivalents). As with v1, I'm planning on taking this through kvm-x86. v2: - pause() the child after creating workers so as not to busy loop, and to maintain equivalent functionality. [Sashiko] - Don't bother pinning the parent of immediate child, and instead focus on affining workers to their CPUs asap. v1: https://lore.kernel.org/all/20260730191908.2084803-1-seanjc@google.com Sean Christopherson (12): KVM: selftests: Add a KVM syscall wrapper for sched_setaffinity() KVM: selftests: Set threads CPU affinity before doing work in hardware disable test KVM: selftests: Pre-set threads affinity in hardware disable test when possible KVM: selftests: Return the target CPU from pin_task_to_random_cpu() KVM: selftests: Extract picking of random CPU from cpu_set_t to separate API KVM: selftests: Affine threads to random CPUs in hardware disable test KVM: selftests: Drop unreachable, dead code from hardware disable test KVM: selftests: Add KVM syscall wrapper for pthread_create() KVM: selftests: Add KVM syscall wrappers for pthread_{cancel,join}() KVM: selftests: Add helper APIs to cancel+join pthreads KVM: selftests: Add KVM syscall wrappers for pthread_{g,s}etaffinity_np() KVM: selftests: Clean up global constants in hardware disable test tools/testing/selftests/kvm/arch_timer.c | 18 +-- tools/testing/selftests/kvm/arm64/vgic_irq.c | 14 +-- .../selftests/kvm/arm64/vgic_lpi_stress.c | 8 +- tools/testing/selftests/kvm/dirty_log_test.c | 4 +- .../selftests/kvm/hardware_disable_test.c | 103 ++++++++---------- .../selftests/kvm/include/kvm_syscalls.h | 48 ++++++++ .../testing/selftests/kvm/include/kvm_util.h | 11 +- tools/testing/selftests/kvm/irq_test.c | 4 +- tools/testing/selftests/kvm/irqfd_test.c | 4 +- .../selftests/kvm/kvm_page_table_test.c | 6 +- tools/testing/selftests/kvm/lib/kvm_util.c | 10 +- tools/testing/selftests/kvm/lib/memstress.c | 4 +- .../selftests/kvm/lib/userfaultfd_util.c | 7 +- .../testing/selftests/kvm/memslot_perf_test.c | 4 +- tools/testing/selftests/kvm/mmu_stress_test.c | 4 +- .../selftests/kvm/pre_fault_memory_test.c | 4 +- tools/testing/selftests/kvm/rseq_test.c | 12 +- tools/testing/selftests/kvm/s390/memop.c | 4 +- .../selftests/kvm/set_memory_region_test.c | 6 +- tools/testing/selftests/kvm/steal_time.c | 6 +- tools/testing/selftests/kvm/x86/hyperv_ipi.c | 32 +----- .../selftests/kvm/x86/hyperv_tlb_flush.c | 30 +---- .../kvm/x86/private_mem_conversions_test.c | 4 +- .../kvm/x86/private_mem_kvm_exits_test.c | 7 +- .../selftests/kvm/x86/recalc_apic_map_test.c | 5 +- .../selftests/kvm/x86/sev_migrate_tests.c | 4 +- .../selftests/kvm/x86/sync_regs_test.c | 5 +- .../selftests/kvm/x86/tsc_scaling_sync.c | 4 +- .../selftests/kvm/x86/xapic_ipi_test.c | 31 +----- .../selftests/kvm/x86/xen_shinfo_test.c | 10 +- 30 files changed, 183 insertions(+), 230 deletions(-) base-commit: 3c7d7f908d574277a845423ec32250a8d8df44c8 -- 2.55.0.508.g3f0d502094-goog