From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792715335; b=LJ2uwJNUFsYb48cX8lKigaGxdqGkz0LN7yZxKzRZz2NZSaxBKavyD1BT0m4W73nsK4a0 1owvxszQTWYtPWzfIMmXdKzAgFHKxbaC2FkfftoPfxXRb0vr6K66uB4QuX+TjP5vVY9M0 VnF+a4L/CRvlm32qVpn73eEnBG+ayWVx9VOV/ZhWOQWGBpTFTz81Og5sQ3Zt2BZKqr7aI w6hgtqb7fZvgzeDYd5fB3XTd+H0GxDlErAnQHa2zLu71WJN7wf6NOe213ck8Iu9vt0nxc CdZHAw/23kgchHDADOjJ270QntM3BCwl6mB3TZFZTeYqZDqOT+uBC4HjQSDKK6Qn9kw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792715335; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=igRysZJrW5JAQ0vNF0XIF2AY7svHdNyPSgMCke+h060=; b=tFlu47qQWbowjFCO5qQLRxuL6FjW7SaJXEJZ4DoiJ51EPaakGM/8HITnJg+LBVGKio5s +jJoTtnzev4nJqvOiCJvxY3dKVVrvu6Y0cW6Zz4g1uk8b7mvKJU0/7Gh+1GVtHozXnEFG Hbx+JqfoJEJC0Dy9SbP209PvZmLUXReGRCNXqxvr9R/XJ02YuonEC/gMy3ljXVELtahD8 /Tqhw527Je2jcl5s+4Yh4dSovc9yId6X3sgg+0AB6h/FzfFKiItF/SnfhOv2SDe9oPjLV 4C4VGnh5JPJ/n5hlZfyoEhYoJruzBGtw92Pr6Wy1p7cyKZfJ41ettCB9dm464cwdiEA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=AxsCL79P; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE5CF606A31E for ; Fri, 23 Oct 2026 00:28:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=AxsCL79P Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE1671F01825; Fri, 23 Oct 2026 00:28:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792715334; bh=igRysZJrW5JAQ0vNF0XIF2AY7svHdNyPSgMCke+h060=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AxsCL79PmDws1gsXExA+Fj1XyFm2/UZ/FMq8xRuAU8CESvKFoQP9IYI2rqTZzt37z /ogzSlD1yehDAUyByCwIUnrWtF+yreUv49soXJ+AYe4NHmKMh1P1cz7TiAs91GSyuA 59STu7hAVztlUSyZLBO19NDJMhGVDjrYxjMeNKIhpbI20wC7aIptiFN/yEDAsoGu5w yOAcVe34X5gXxcWwlWJpaR+H9CjWZ2O+guiVxa2h2QkvTts7c0DYtPeUpHG6tXWn6P XuPIBWTEWDABhoZ4I9S/3Oiu1afDCmyRXR3gl8fjFRWhj4bPBih2nSxpuU1MrN+dYP 9QdIfLSGM2jqw== From: Sasha Levin To: stable@vger.kernel.org Cc: David Woodhouse , Paolo Bonzini , Sasha Levin Subject: [PATCH 5.15.y 1/3] x86/kvm: Silence per-cpu pr_info noise about KVM clocks and steal time Date: Thu, 22 Oct 2026 20:28:49 -0400 Message-ID: <20261023002045.2270144-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026102116-motion-upchuck-3417@gregkh> References: <2026102116-motion-upchuck-3417@gregkh> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: David Woodhouse [ Upstream commit f3f26dae05e39f0f286f588669b54d49b61dcfb8 ] I made the actual CPU bringup go nice and fast... and then Linux spends half a minute printing stupid nonsense about clocks and steal time for each of 256 vCPUs. Don't do that. Nobody cares. Signed-off-by: David Woodhouse Message-Id: <20211209150938.3518-12-dwmw2@infradead.org> Signed-off-by: Paolo Bonzini Stable-dep-of: 81d99abe2bd8 ("x86/kvm: Don't consume async #PF flags on a kernel #PF in NMI context") Signed-off-by: Sasha Levin --- arch/x86/kernel/kvm.c | 6 +++--- arch/x86/kernel/kvmclock.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 4286b0f247ea3..32d3319115e51 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -324,7 +324,7 @@ static void kvm_register_steal_time(void) return; wrmsrl(MSR_KVM_STEAL_TIME, (slow_virt_to_phys(st) | KVM_MSR_ENABLED)); - pr_info("stealtime: cpu %d, msr %llx\n", cpu, + pr_debug("stealtime: cpu %d, msr %llx\n", cpu, (unsigned long long) slow_virt_to_phys(st)); } @@ -361,7 +361,7 @@ static void kvm_guest_cpu_init(void) wrmsrl(MSR_KVM_ASYNC_PF_EN, pa); __this_cpu_write(apf_reason.enabled, 1); - pr_info("setup async PF for cpu %d\n", smp_processor_id()); + pr_debug("setup async PF for cpu %d\n", smp_processor_id()); } if (kvm_para_has_feature(KVM_FEATURE_PV_EOI)) { @@ -387,7 +387,7 @@ static void kvm_pv_disable_apf(void) wrmsrl(MSR_KVM_ASYNC_PF_EN, 0); __this_cpu_write(apf_reason.enabled, 0); - pr_info("disable async PF for cpu %d\n", smp_processor_id()); + pr_debug("disable async PF for cpu %d\n", smp_processor_id()); } static void kvm_disable_steal_time(void) diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index 1d986b353b3e5..047f97813bf34 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -174,7 +174,7 @@ static void kvm_register_clock(char *txt) pa = slow_virt_to_phys(&src->pvti) | 0x01ULL; wrmsrl(msr_kvm_system_time, pa); - pr_info("kvm-clock: cpu %d, msr %llx, %s", smp_processor_id(), pa, txt); + pr_debug("kvm-clock: cpu %d, msr %llx, %s", smp_processor_id(), pa, txt); } static void kvm_save_sched_clock_state(void) -- 2.53.0