From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4F04A3C279B; Sat, 8 Aug 2026 10:36:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786185405; cv=none; b=JyEHaV0cpXqF9c7yT+HeBPBMp8/ZUNTTKvtp/2TBX27xgkiT/8ObG7vkeLJCCixN33piNbWisKHupYRBA1TG0qsx3d76DHF1NFPBCXxZzHJO9IBHR+U4jAcbSX6R/2KI2KHiPUWrjY4dzITFUHIZ01vGDn9a1zGsqXuY9BslStc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786185405; c=relaxed/simple; bh=RBMyDlI9bYhhju6SazkJ74+FPw4KUUTT3qdlDDFzYVg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=oeLp8FTfMy0ee4u1jLZiLeN4Kmu1oyCFqjzhzKX57nWWHH0V+nzxLNC+X2w10kVKeVxWCsi20t3dLX3yRMLV8pYwi/eqU3ckaqyaUI+NPpwp7YC6ruHBgJQBpg2fPNmnSsrcjxL9EzzFOBJAenQL7gNAgsvfGyNBIsUIMjOqEyc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=MiHbwmDI; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="MiHbwmDI" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:References; bh=mrC+xOT3bpITTMAExjiGGBzjrg3sW5ihiujwcUvw5oE=; b=MiHbwmDIzYwEe6BwoNHGeNjHq7 f65veJY5YjTHd83AKNHa4qlLhl2EUZpbVBaKqJiRZbtmu20uTY06o1B9vUPmy9ooa0TSwVbO5SmyB Xy0GLrvdIYt0ZVf9LjZ9Y5CZGlIdKAAMhY3vBTHKxjBRud+sPw9U/bCbRI6kAK+1MRJ14Lqdn74XU imEjrXxYVgSdeKhaTEfdqtWfdcNVAMSL8GeyMQWoCow4VfoKrqiLLHSIhmsGgpzr51rHAAQTat189 ObgOshNFcjyaEjVmhcISSqs8Yd6VuRoErbndkGqxAkVjftfRavz/HKtgRiucilnU6E14iBEd/ZZjN z8nvzx4A==; Received: from [54.239.6.187] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wsePo-00000006Fn4-0KfB; Sat, 08 Aug 2026 10:36:32 +0000 Message-ID: Subject: Re: [PATCH v6 01/51] x86/apic: Provide helpers to set local APIC timer frequency in hz and khz From: David Woodhouse To: seanjc@google.com Cc: kas@kernel.org, rick.p.edgecombe@intel.com, pbonzini@redhat.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, jan.kiszka@siemens.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, jgross@suse.com, daniel.lezcano@kernel.org, tglx@kernel.org, jstultz@google.com, x86@kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Date: Sat, 08 Aug 2026 11:36:30 +0100 In-Reply-To: <20260806233609.212337-2-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-+oD9ig9rliifEw/S0oU7" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-+oD9ig9rliifEw/S0oU7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-08-06 at 16:35 -0700, Sean Christopherson wrote: > Add and use APIs to set the local APIC timer period (given a frequency) > instead of open coding the subtle HZ math in all external callers, and > make lapic_timer_period local to apic.c. Provide APIs to specify the > frequency in both hertz and kilohertz so that Hyper-V and VMware code > aren't forced to lose precision. > > Opportunistically take the frequency as a u64 to harden against the > possibility that the frequency (in Khz) is greater than 4294967, i.e. if > the APIC timer runs at ~4.29 GHz. As pointed out by Sashiko, > 4294968 * 1000 =3D=3D 0x1_000002c0, and thus a Khz period of 4294968 woul= d > silently overflow the 32-bit unsigned integer used by most callers. > > Print out who set the period to maintain equivalent Hyper-V and VMware > functionality, and in general to make it easier to triage/debug issues. > > Cc: Michael Kelley > Signed-off-by: Sean Christopherson Reviewed-by: David Woodhouse --=-+oD9ig9rliifEw/S0oU7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE 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