From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f198.google.com (mail-pg1-f198.google.com [209.85.215.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6532D44E67C for ; Fri, 31 Jul 2026 17:06:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785517590; cv=none; b=Jd/9oidprPe4b8glKcJo+bAWm393NZLtvxnjA7Ry9VT9rFBAFNFENlap7qurw/gUEopK+mHo8A96PFXcKBqgtXQCio+LoTrCgY7phx14nWUkqMylgCdPSn7D3y17BRWio1eUgTc02GuFbcBGDqrOY4DawB4RKG8rpRJp5pBgIm0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785517590; c=relaxed/simple; bh=HRd/veKnQQoNlLPIk/S30A+ciXDQdelNm8xjt5JmDww=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=m9aerIKo+AqopEUEDaR42h6BMs+8J7EdTUBBTXSfRcGXpu71ESyKi54L9SzGzBUMxJKTh+/UwVzeMazGB7yD+CQj+PKQLNVFXFvaq+m8pe1YqBcuGHveaFKev1vA1ai9P8hcQ7KtyUQ9WJo/ccmzUMSIunnxIv6vZOjiP/0mRw8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=f5Pjn6Fd; arc=none smtp.client-ip=209.85.215.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="f5Pjn6Fd" Received: by mail-pg1-f198.google.com with SMTP id 41be03b00d2f7-cb5cc1e139bso769216a12.3 for ; Fri, 31 Jul 2026 10:06:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785517588; x=1786122388; darn=lists.linux.dev; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:reply-to:from:to:cc:subject:date:message-id :reply-to:content-type; bh=kus6EqucfaH9HPf637yAVY0TPxuMIU/5NctVRnWGiLw=; b=f5Pjn6FdMlk/ffbnzalAto83vFn6QYC/vq4Vi60WmTZo7LVKnB8rnrgk5K39P5sVtc NJCDM1+NpO5y5wEmDdZVsDuq+7VSzOJKWZRbd5NgoyvUa/ZRjf9Iuu0YoktpiFhxbeU0 nM/d2SyQmyQH3Yf/nW4/nkofHwlZuYvNzJUGfE9BZI1achTBeYk4G+3Are53nnhoXkVZ o3tRqRndQMuHQkXUNIFBMFbsOZyKS/pZzwuOR6xn/Njj5l1gUdIfIoXZEFhiuZyAlOzb CzbQyP9OL1p4dpAr34AHVNvoLtBlkfEdYXHxUA4ZjwA4o9L5QjG1skcJdBcGX7xhNvZa b2Ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785517588; x=1786122388; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:reply-to:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=kus6EqucfaH9HPf637yAVY0TPxuMIU/5NctVRnWGiLw=; b=Wb3sRIRrXfEOQdnFZSHtA3awH3oiNKtbhYbeGS7L0GaILJzZZAtjbfh2WQBihQzejh jRXFILS4QxKiD64XMZ/R/ODio/PdxL0LlTyJJo2hdcciynmyMGIp3+6PdOqnL7ihZ6SM hk9Jdg7gd+HLkcacXBpaQx/fpWt5d1TuzOakZHGSBpwP/YITsQCmlEa/EDRE5lKZFE5S 3Eb5GPjBMv+9zU2f+FZjDvacZZEjewVSFeQ9uz4YqcUR6kqQtmDgpU7tw6N+xwepZrYQ jdlyyqONYLmS0Pqs3R09D3mDdStGZAmG0W/Ns7lp89dExJF49iw3kYKeEQofVCd9v3iv YK2Q== X-Forwarded-Encrypted: i=1; AHgh+RoqF+aJia/rv+/N75hBSfD0kpcoYtUMGPUHR2+gtmxMmkT1oeO3VjqZguxclslBgJTbO5lIiRM=@lists.linux.dev X-Gm-Message-State: AOJu0YzC60QLtS1HKvMlnaYkltGpep0pbb8TKR1dwmOGby9W4D2TI8FF DRbeqJVChWD8O6xY+DuORu21HawRnNJe1cC6fLixb/igw4ZkFc3jsjuhCucmo5y3ixnaf+KYMDp bQqs3pg== X-Received: from pghd20.prod.google.com ([2002:a63:fd14:0:b0:c96:8e22:a215]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:116:b0:3c3:a1a4:862c with SMTP id adf61e73a8af0-3c92a94e9ffmr515706637.68.1785517587444; Fri, 31 Jul 2026 10:06:27 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 31 Jul 2026 10:06:11 -0700 In-Reply-To: <20260731170619.2620845-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260731170619.2620845-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260731170619.2620845-5-seanjc@google.com> Subject: [PATCH v2 04/12] KVM: selftests: Return the target CPU from pin_task_to_random_cpu() 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" When pinning a task to a random CPU, return which CPU the task was pinned to so that the caller can do things like avoid running other tasks on the target CPU. Signed-off-by: Sean Christopherson --- tools/testing/selftests/kvm/include/kvm_util.h | 2 +- tools/testing/selftests/kvm/lib/kvm_util.c | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index b39e713c30a4..61d72e1e7601 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -1094,7 +1094,7 @@ static inline void pin_task_to_cpu(pthread_t task, int cpu) TEST_ASSERT(!r, "Failed to set thread affinity to pCPU '%u'", cpu); } -void pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus); +int pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus); static inline int pin_task_to_any_cpu(pthread_t task) { diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 3794575d2ca0..af2bad0553f9 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -668,7 +668,7 @@ void kvm_print_vcpu_pinning_help(void) " (default: no pinning)\n", name, name); } -void pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus) +int pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus) { int target_idx; int nr_cpus; @@ -682,11 +682,12 @@ void pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus) for (cpu = 0; cpu < CPU_SETSIZE; cpu++) { if (CPU_ISSET(cpu, possible_cpus) && target_idx-- == 0) { pin_task_to_cpu(task, cpu); - return; + return cpu; } } TEST_FAIL("Failed to find random CPU in possible_cpus"); + return -1; } void kvm_parse_vcpu_pinning(const char *pcpus_string, u32 vcpu_to_pcpu[], -- 2.55.0.508.g3f0d502094-goog