From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f200.google.com (mail-pf1-f200.google.com [209.85.210.200]) (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 CD3B53B440E for ; Thu, 30 Jul 2026 19:19:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785439154; cv=none; b=h5Po+4gW3tV63vdN8Gn0eJmH/H4ClQrM/3g4IfbHHSRklVlAXbePSkNQLWO0GmhN6wElKlzB9OH7dGalZGMlArxxEb4DJlXZrRX8q7Qlxvp/BRq980pPueKZKYwtGxpZaNByPBepZiyK5zfvyaT+xsSjkz+fJVlTG9MRMI5eQUU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785439154; 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=LaWGIX2SEga+73xLFmZCj/gahBjJbMDUe4vOZeBAL97Ar3fTucDDW7FgtgQ+pTXb0Zo5KBHv1Sb7Yc4W2RUa8unJdakoBEI3Q68j0QU72i7yZUaOPzjQMEJRIoQwUzuewGCgCcj4PbdavTg398FBYFL7/BFGxjVW3LFiwM0Ksd0= 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=sctFyi6m; arc=none smtp.client-ip=209.85.210.200 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="sctFyi6m" Received: by mail-pf1-f200.google.com with SMTP id d2e1a72fcca58-8485d853b08so361053b3a.1 for ; Thu, 30 Jul 2026 12:19:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785439152; x=1786043952; 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=sctFyi6ms9V2HS+SVpUrdpis4US11PnuZtouV/u/wlE0ZnocZxOHpkGJQIeQcFoSfW 7K886laFVzIkde5TNSv3eAXCzdUEbXb5KItjtB/mco1b0q7amDe2BYypWh2wY0PHu59y itamf46hfnunLusoBtqCCMfC2bJQ6OnkOP3LyKeBeqNKNnoF4df4ReC4TEy9+8dJjrhw uEnuK6yGqoZEY+ztHYJZD1NDohOErcJsg9wsHw36+7eGS7Vi9+Rme8Lv943+i6Tk5e8H CS1Cv6Tj5BkFjvnlenrze+11V3U6ysjKisd/TykOigdMYprERMbQcy01s/mEMv7cilb3 7gNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785439152; x=1786043952; 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=I0GiexfpeXZw2/RotR0JFlJabl9hiR4zLt06DgrROpvOfO2sNfb4iruYtuFwfwOqg6 /EGdps9u6xUmCdE0FPTRmAeux72Lk3vC9HTFxru4U8iJqiDIza+oqnJPr5oZIk2urDTO Q8RhHEgplycCHdvOLcw/ggHgRXP9dgeKov5PUvtLCQNCOxI7G099Iid2CN88k896HJi0 NEOqbODYr4Kv6L7chwqAmN2nthhE8r8gyd3NWGnCYrAcPe1EoSNWEbf7CuOscCI91wtH MSOHzzOT2eWecJSHSroeV+UVEJbYwaHpSeLqiJUANREdbjwzyZy4uAl67YnRK8wgMrFq PxUA== X-Forwarded-Encrypted: i=1; AHgh+Rosnf0Hy4mNDGxV0UXnXbfpreewSUsvystI8ThLaPJaVqZULyvFkf/lVu7727k51O47KanMb5Q=@lists.linux.dev X-Gm-Message-State: AOJu0YyVk9SxWOulR3JHKKguRwPU9m5glvozf4shAabj7jTUtAvgZhXU 7GcWEWvJWBBhInisY14VWSv7rPCms7aGtA5gRliyeW0fwh3auVQ0yIUOaWgDry6LalWf2kWcWw5 Fp6Uqpw== X-Received: from pfjd18.prod.google.com ([2002:a05:6a00:2452:b0:847:7599:7277]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:3020:b0:846:8b21:6304 with SMTP id d2e1a72fcca58-84ebc1fd6bemr3617195b3a.14.1785439151792; Thu, 30 Jul 2026 12:19:11 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 30 Jul 2026 12:19:00 -0700 In-Reply-To: <20260730191908.2084803-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260730191908.2084803-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260730191908.2084803-2-seanjc@google.com> Subject: [PATCH 1/9] 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