From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CBA49C433EF for ; Wed, 1 Jun 2022 12:55:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352408AbiFAMz4 (ORCPT ); Wed, 1 Jun 2022 08:55:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232460AbiFAMzz (ORCPT ); Wed, 1 Jun 2022 08:55:55 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB75E6FD26; Wed, 1 Jun 2022 05:55:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=PvnY4f6raeIKuCN1PO950argpuur0vlG5YTm23/TIyo=; b=NtvTkl0wA87gBtf6ObEy5+OutY QXVNfiTR6FVh7QIWlw2R2wiaQhuRUGtHQJ+o6Z4ZxXmtaN+rzn+st5P4o6nqvvhIDUjfINcfN0YKS HqpvSpOcgZ53YHJjXNhSlULkbCY541ucARH5Bnj8MM+CBqGZWijSws+Q4fzKNtQjr0/kK/zBkFB4+ KJ78ia2fC3zhwwjrHviCMIVxMgkO0BwzBJQhcWxBg92rb7iRUOVKa7ueHKw/qt3leaan1aRCs0xBL GkMkblBguF/p94QrgkOwxRtIEK25SV4HEIfec3UfGPucbSgJlOD1IPU0f6vMSZvY8IME0k6RERl+J Fp/jeMgA==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nwNsU-003mZr-20; Wed, 01 Jun 2022 12:55:10 +0000 Message-ID: <7a030232a8002a31520e1c435034f2c9b2f8a858.camel@infradead.org> Subject: Re: [PATCH] KVM: VMX: CPU frequency scaling for intel x86_64 KVM guests From: David Woodhouse To: Paolo Bonzini , Metin Kaya , jalliste@amazon.com Cc: bp@alien8.de, diapop@amazon.co.uk, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Date: Wed, 01 Jun 2022 13:55:07 +0100 In-Reply-To: <0194b22a-38a1-08a1-a576-de6463389ce4@redhat.com> References: <20220531105925.27676-1-jalliste@amazon.com> <20220531114333.29153-1-metikaya@amazon.co.uk> <0194b22a-38a1-08a1-a576-de6463389ce4@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-2fY5x4KN15+eABK7O71C" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-2fY5x4KN15+eABK7O71C Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2022-05-31 at 20:11 +0200, Paolo Bonzini wrote: > On 5/31/22 13:43, Metin Kaya wrote: > > Thanks, Jack. > >=20 > > Reviewed-by: Metin Kaya > >=20 >=20 > Please try a bit harder. "Reviewed-by" is neither "this matches what's= =20 > been forever in the Amazon kernel"=20 Oh, it hasn't made it to the Amazon kernel yet. I have started threatening to *eat* people who even submit stuff to the internal kernel for review without first posting it upstream. That does mean you get to see it sooner, which is a mixed blessing :) > - does not even *apply* to the upstream kernel, because it uses=20 > (presumably Amazon-specific) CAP numbers above 10000 >=20 > - does not work if the vCPU is moved from one physical CPU to another >=20 > - does not work if the intel_pstate driver writes to MSR_HWP_REQUEST >=20 > - does not include documentation for the new capability >=20 > - does not include a selftest >=20 > - is unacceptable anyway because, as mentioned in the cover letter, it= =20 > isn't undone when the process exits That's a useful summary; thank you. I think we should definitely focus on integrating with cpufreq too. Is this even a KVM thing? I don't think we really want to do the change on every vmexit/enter. We could *maybe* make a case for doing it on entry and then removing the limit when either returning to *userspace* or scheduling? But I think even that probably isn't needed. Just let the VMM run at the same frequency too, as a per-process setting. > Jack, please understand that I am not really blaming you in any way, and= =20 > ask some of your colleagues with upstream kernel experience (Alex Graf,= =20 > David Woodhouse, Filippo Sironi, Jan Schoenherr, Amit Shah are the ones= =20 > I know) which patches could be good targets for including upstream. Indeed. As a straw man there are worse ways to start the discussion. 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