From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (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 7E3074D9914 for ; Wed, 1 Jul 2026 19:32:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934364; cv=none; b=rJafoZSiQ2dxyJMroS62OVeLkTGFF4qP6kk+OhwxJ9m+Q2nqHHsM1RT2yKIftgXW6tXkR2sZWibXHPsgqi5OrlMUA3Fq6TkSUIJQJYumUAF4yYkCQsGTmEMc4aU/JOrle3GGKKq9+cMqcoBByBP6JdsXsQ9fKb4Wp59V4fWz4fI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934364; c=relaxed/simple; bh=vQr5rqbnVfhj/Q8IIvrfTuhOuv1ctDO8Y9v3PaUviPM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=YyRHqZIJTxzwqx3QaniALhVVbnzVJhLB14+gVS67melL/jqz6C29N+how+ZUv3lh5cuhtqDuybk/C1oCXS7UdJsGpOFc3Qrdt771WGJgS0/J16BmTB7QPkFNIuSAoQNcxhoKJf9+/pj1CB+xiZFk1np2pqemxNZShJHe2ZUfvjo= 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=aZBYAt4C; arc=none smtp.client-ip=209.85.210.202 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="aZBYAt4C" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-84622d6102dso1270895b3a.1 for ; Wed, 01 Jul 2026 12:32:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1782934361; x=1783539161; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=ReYT3wow7KWZM4WGFuJpCOGL6Ebh0IHq2felz3Yetls=; b=aZBYAt4C+qdRtJy1B8y3nO0brOL0G2zKGPUUFp3Gar+8RkIJY23yZofOUQjek8B8ph mKQxX/dcsZiWli/YP3qj7+nobEJ1UrqhhQvDP2YgDfxn91Oza+F+8B2+DljfC2frO5LB eoV6B7qPwlUXX1EhEKnwh+c1XkODkDSpRALXh2b1RS+EntGOSo/CcYUPzrmm50b1/y8b e34x685rxnhMLAPJrjd0XZHh+yavBkGLICurherbOqOZ5UzIsh2/o7Z7ieStTX1rNyX9 v0dQgsWWR4S88XZg2xPf4sUwMe/UoIglrr9HQIlryZQYpm3YeZKHSscBo+o0c/khzmeY 9IOw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782934361; x=1783539161; h=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; bh=ReYT3wow7KWZM4WGFuJpCOGL6Ebh0IHq2felz3Yetls=; b=NkJ2xxQx3vTC6HSpPuZV2Giawv9ddx0s7rXo3/lA0RsC+mkQrep86XfrS/rPtDL0g7 AaVum9qGtrTidnZFSsl4mKDtY0vWi2vTgf9PARC70v+RX9oJlpjXOHlg+AEYcUynG5OB L3Gcrc1RO1vk8LxamrDNNhU0ltf8bY6R8+NG8Un+eh/QKOAUJ14P6q7os2pExitxcFvO N4hNLOwJ6C2Nyn/RSScDw6E37kLJi+YS1UufvSQkAIHr5J0zQAsv147JobRt7E6BZro/ 5IyZwdxAqFAtZwGHJN7AlWv1KQLDeYZpvGDHB7A43bnX1yFCZgthqvL2V5jwaxHetoaS CtOQ== X-Forwarded-Encrypted: i=1; AFNElJ9MOMJEYNDUjTT4BDcz7irY5HGrtC8vd9oRJu10xkSVw4cSeOJZIhLSPIIkTmaEPiIp5gO3RcJ1FIrB/rc=@vger.kernel.org X-Gm-Message-State: AOJu0YxFvljElOnlxRNufmiK9dMvPoJa3uMl6E5Hk8g2G02SWcvB1GG4 yOoOm4i80U/rcZ+5bS8EdSnczKtl3U3EsnNU1sia55a/GA1gxfrUjmlLEMt3wph96UpuMj+PCeS oW55PVg== X-Received: from pfwy27.prod.google.com ([2002:a05:6a00:1c9b:b0:842:8af7:db0d]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:9a6:b0:845:ccf1:49b6 with SMTP id d2e1a72fcca58-847c51b72d4mr2049167b3a.45.1782934360386; Wed, 01 Jul 2026 12:32:40 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 1 Jul 2026 12:31:33 -0700 In-Reply-To: <20260701193212.749551-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260701193212.749551-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.rc0.799.gd6f94ed593-goog Message-ID: <20260701193212.749551-13-seanjc@google.com> Subject: [PATCH v5 12/51] x86/acrn: Register TSC/CPU frequency callbacks iff frequency is actually in CPUID From: Sean Christopherson To: Jonathan Corbet , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Kiryl Shutsemau , Rick Edgecombe , Sean Christopherson , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Jan Kiszka , Andy Lutomirski , Peter Zijlstra , Juergen Gross , Daniel Lezcano , John Stultz Cc: Shuah Khan , "H. Peter Anvin" , Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, Tom Lendacky , Nikunj A Dadhania , David Woodhouse , David Woodhouse , Michael Kelley , Thomas Gleixner Content-Type: text/plain; charset="UTF-8" Register ACRN's TSC/CPU frequency overrides if and only if the exact TSC frequency is actually provided in CPUID. This will allow marking the TSC as reliable as appropriate, and avoids relying on the caller to handle "failure". For all intents and purposes, no functional change intended. Signed-off-by: Sean Christopherson --- arch/x86/kernel/cpu/acrn.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c index ad8f2da8003b..dc71a6fdd461 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -19,6 +19,8 @@ #include #include +static unsigned int acrn_tsc_khz_cpuid __initdata; + static u32 __init acrn_detect(void) { return acrn_cpuid_base(); @@ -26,13 +28,19 @@ static u32 __init acrn_detect(void) static unsigned int __init acrn_get_tsc_khz(void) { - return cpuid_eax(ACRN_CPUID_TIMING_INFO); + return acrn_tsc_khz_cpuid; } static void __init acrn_init_platform(void) { /* Install system interrupt handler for ACRN hypervisor callback */ sysvec_install(HYPERVISOR_CALLBACK_VECTOR, sysvec_acrn_hv_callback); + + acrn_tsc_khz_cpuid = cpuid_eax(ACRN_CPUID_TIMING_INFO); + if (acrn_tsc_khz_cpuid) { + x86_init.hyper.get_tsc_khz = acrn_get_tsc_khz; + x86_init.hyper.get_cpu_khz = acrn_get_tsc_khz; + } } static bool acrn_x2apic_available(void) @@ -80,6 +88,4 @@ const __initconst struct hypervisor_x86 x86_hyper_acrn = { .type = X86_HYPER_ACRN, .init.init_platform = acrn_init_platform, .init.x2apic_available = acrn_x2apic_available, - .init.get_tsc_khz = acrn_get_tsc_khz, - .init.get_cpu_khz = acrn_get_tsc_khz, }; -- 2.55.0.rc0.799.gd6f94ed593-goog