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 46E2542F6FA; Tue, 21 Jul 2026 07:33:55 +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=1784619239; cv=none; b=rhptKvhiAyNbzc3GXQQRPfmDV2w8YlBA4/yazKkHciyQePHJ5l4pj1PDOZYD9XxGJtgdGw/+GSGXzCfjadwXdehpHfSLeHDPRMKoRN0tZU+jEbXQw4UPRDI5lz9KTEhWio5Y4XwiQh5ZoLRMczw/OdUxZC0KwComV7J3lgT083w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784619239; c=relaxed/simple; bh=PznmX3DboxmkJhIzVCWhwNnJClpaG7ou4S1MIoF7Or4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=G4BHX2AFF0PDjEYAtqcbfwC2EROBJESUXAP8X84FFJyj3tjxVFHNRpHcuy2p3frgSKucmiInYnIceMUbDd0jCv50chrx+uUNlJ7eSZTanOsg+H5Zy9sGNIbOBmW1YxbsVQZ0yQJ/KCUm3CJlGiYGpXmpyDj/RoOQ4ALrC75XRn0= 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=iRdpS1+y; 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="iRdpS1+y" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=PznmX3DboxmkJhIzVCWhwNnJClpaG7ou4S1MIoF7Or4=; b=iRdpS1+yMd6Dr51BhFrpuWTgr0 DTq8AHuyqRKnBUIhV7UZb9gYTDwfWXYhxTMmm851C+Zk0/N4EZgMOqDv4AGgHoySzpJzosx+guhO2 F37BWloTrXaK40RlAbCNqs4kR8eDxqDUhG+cA29JqAw43BnHJntNayj5HKX+Wf0lt3U0SZSuhXOZz 3yyQ18NFNzygyQiimXJV/2vZy8Vv8GYfYbTLwRUPOBjWHnXJu5agvcPZMGAl/DNPcHZjsfOIHZAJm +o5FSzjjeKoGo9+/TEUwVekYUlr2TB4d/pPN/AV1MeMlUtmK1/BA8+61qXHsF/tho3o/fYICnf2EG vkXX7tYQ==; Received: from [2001:8b0:10b:5:20bb:46f3:73c2:f4b2] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wm4zA-0000000Chh8-2ERj; Tue, 21 Jul 2026 07:33:53 +0000 Message-ID: Subject: Re: [RFC PATCH 1/2] KVM: x86/pmu: Add CAP to disable SW accounting of emulated instructions From: David Woodhouse To: Sean Christopherson , Luka Absandze Cc: Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Alexander Graf Date: Tue, 21 Jul 2026 08:33:46 +0100 In-Reply-To: References: <20260720192221.72912-1-absandze@amazon.de> <20260720192221.72912-2-absandze@amazon.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-MXsei1UVd9EYmV+W0ON0" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org 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 --=-MXsei1UVd9EYmV+W0ON0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-07-20 at 15:27 -0700, Sean Christopherson wrote: > On Mon, Jul 20, 2026, Luka Absandze wrote: > > The only functional change for an opted-in VM is reduced accuracy: a > > guest counting instructions-retired or branches-retired undercounts by > > the instructions KVM emulates in host context, i.e. the behavior that > > predates the accounting cited above. Hardware-executed guest > > instructions continue to be counted by the backing perf_event, and its > > overflow/PMI path is unchanged. >=20 > Do you *need* per-VM control, or would a module param (or a magic value f= or > enable_pmu) suffice?=C2=A0 While I mostly buy the "it used to work this w= ay" argument > (just "mostly", because that commit landed 4.5 years ago), I'm not exactl= y keen > on adding uAPI that is effectively "re-introduce a bug to workaround fund= amental > design issues in KVM's emulated PMU implementation". Which is the bug? Some would argue that timer interrupts running 50 times slower is also a bug. We just get to choose *which* bug we want the guest to experience :) And I think that is a per-guest choice, if we can't find a way to do it with *sufficient* correctness *and* efficiency (qv). --=-MXsei1UVd9EYmV+W0ON0 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z 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