From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (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 0EECB29B8E5 for ; Tue, 16 Dec 2025 22:59:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765925968; cv=none; b=T6Y62GJRX0M+doECT8d1VcBNQWGZdqAS0K6+oalIx+OdFOvbAuSfSbILas/OjgbBY+3Nsz1gqwOZH/5ZxXhY37TVK/Er9K8RPK9x7IS0/T68wDJZ3RpskTm9rgzZI2QCZoznP4BnhuCNcpW4GgR3NuYsXGgVmPZ4ZqwG3IZMziw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765925968; c=relaxed/simple; bh=kWLv1ZatiB79bU/6xLjGSPPP8KxuSeaL3GK3ohz7jvM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=JTe87js+XOThPP2Jw0brMKOF2GsgWw5tL9lM+wHdCmsWS57DE/OSHx7vanD1SfQAKg11UuA93RGt9ieAauPkT+OJPavF1ShaxQDS7iexlC2anRBD13DCvNcFSSo+UVzlo64kV5p1NzrF6TVXxQJR2qwQGf5ngIz+2WtdhZdi9aM= 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=logYfAw4; arc=none smtp.client-ip=209.85.215.201 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="logYfAw4" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-bbcf3bd4c8fso15414a12.0 for ; Tue, 16 Dec 2025 14:59:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1765925966; x=1766530766; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:from:to:cc:subject:date:message-id :reply-to; bh=A6FqMrw/4plY2VKF8NHzNlp9G6Ihzs4CeaMN/98WbHo=; b=logYfAw4w+7oeqIUbAhc5AhKLpAuoVQeL5Zj1tVAB4OsOjKc7vMxPED9HzcI3og/6X Xwyj7BHUWCaxpo3KjkYgzAgzKKRxnEPAAkmsiQFrvRMdyun7eVT3IKBuJ5d53K+Dod4T yR/HyyrDVJnFgv4FSn8tJj/MzHi60HxMed6JKNNd1x4KswJx4daPYQbI3dy9et91Bh5L lELxpceyB8byTrWI7W7m0sEoVL9lO8cgRNCfBAKS2i2OtRJaOr9V39eStgFVNvDlwBDv T+VpiwouOhFP1ex0AgZocPlSkvaOPbE1FzeMm5plrIxovJG8BVQKMBt/1WGoEyWWhm21 dEaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765925966; x=1766530766; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=A6FqMrw/4plY2VKF8NHzNlp9G6Ihzs4CeaMN/98WbHo=; b=NAJ1jO+6U3r4duNPECsJqt9syfq7j1JAtdXBtuo1Kp48O78W5clcu9RN2l4Piy5z+F F573CTLMKU3Hex3YeQnOvwul+tsAqE2ax5JYpFOlnRlsyZRjRvU8xpQY4Hg9SgA3rhIg qCkOfK2Qh6uASgQCmUwNce7BVzZmhvqapHrghVDF5qo16slp35HAFtou/h+dkUQy0eUi ZonoUwxhjop9lI2aRQG2pCK5/Mh5/aU+czJKcAxF75P92S500Qx5h4rfRY1ezqS7ffCn qleQoOYBqAvZbCr0ct080Q+wvzmddxlSXwUqs47z6zhvTH/9OVFXpojHtGPcNyqxtYpi vwVA== X-Forwarded-Encrypted: i=1; AJvYcCW9POkza821oMV9A/ECFVjhln1BDQMRORMxrKXdkINT03nFEWr9aKh3EgkOWzR4+Ggtx+BnkrDmG7Gjk7c=@vger.kernel.org X-Gm-Message-State: AOJu0YzAUhdxCHcVd0lMDXpJOLOf57KzsbSISKwy1V7ltc0120zWdtky V54Bzbiz05T23yK8VyUSR6Zxhof1TMkp7tDU9UZKwQgHUbt5KGIxhYlmkN/jlsjqTbBwFsiJnfI MbfbmHg== X-Google-Smtp-Source: AGHT+IExgYn2AoeL6TyR0RvctoohVap9xTM7Yty7PGJedJtwf0ynDvLmNyZOoeANgTeWAYI0dch7dNX6VG4= X-Received: from pjbnb12.prod.google.com ([2002:a17:90b:35cc:b0:34c:c510:f186]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:734c:b0:35f:31bb:5a5d with SMTP id adf61e73a8af0-369a83f9190mr16163192637.2.1765925966212; Tue, 16 Dec 2025 14:59:26 -0800 (PST) Date: Tue, 16 Dec 2025 14:59:24 -0800 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250816101308.2594298-1-dwmw2@infradead.org> <20250816101308.2594298-3-dwmw2@infradead.org> Message-ID: Subject: Re: [PATCH v2 2/3] KVM: x86: Provide TSC frequency in "generic" timing infomation CPUID leaf From: Sean Christopherson To: Doug Covelli Cc: David Woodhouse , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Vitaly Kuznetsov , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, graf@amazon.de, Ajay Kaher , Alexey Makhalov , Colin Percival , Zack Rusin Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Tue, Dec 16, 2025, Doug Covelli wrote: > On Tue, Dec 16, 2025 at 3:27=E2=80=AFPM Sean Christopherson wrote: > > > > +Doug and Zach > > > > VMware folks, TL;DR question for you: > > > > Does VMware report TSC and APIC bus frequency in CPUID 0x40000010.{EA= X,EBX}, > > or at the very least pinky swear not to use those outputs for anythin= g else? >=20 > Yes, all 32-bits of 0x40000010.EAX is for TSC frequency and all > 32-bits of 0x40000010.EBX is for APIC bus frequency. Nice, thanks much for the confirmation and quick response!