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 B90295C613; Tue, 21 Jul 2026 16:55:38 +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=1784652944; cv=none; b=GSvbJAU1+V3RVk92yNF34++Pinv6Ri6uKqRjEF6hQFFk+OB0VcWXPyffpAkXm7KMHkuZPxudTp1lO3B7x3y/mznApC7OXPbA4FdPaSIQBDdWJmg4EyhdfIr9BkiQhc/ZzKNiDBsEG+gZu/1RcUxJehc3lpnWYFwazTcPWabuwvg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784652944; c=relaxed/simple; bh=8dwsbDNOrHIPAf2phXUSBv2WkNx959TKcxehu3aVpbA=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=uJUtEe0kzFeVu4KC4kLf/Rw9wWR7mtH/WPFcGObWYl/EgHhrcfUrefI0iuHtwN/xHc26PXRBh2+YRJC8L567iFP2+4sc1pfezPPWhNPeCvtTpogdOQKZrWW06/b7qbSEqwGfG1GcOi99bZZn151yBtLnlJbEAyHZYEUyD+lVZcI= 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=BzaQiceM; 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="BzaQiceM" 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=8dwsbDNOrHIPAf2phXUSBv2WkNx959TKcxehu3aVpbA=; b=BzaQiceMAOZ2j3bD9Z0vSoWkzY +bcUHAvRWlKibvH1O80L6rdTrdJJEttbJ3rAocfoL6MP12ydpwqEPi3NIquwf4OTMzEAe2Hq+KFCX 4hzrmRwnEZeDOvMY8/3b2+cs27RttkTlhBsI5TDvWhtEx25121zRf/da20p7UFeUdHNKute1Ucqkh HEhp1p8H5x/tlbbpSDV3fGX7kHHBE+54uDTWJzKgNtZXX47uwUQuCMK1PZh5/Kw3i/rzvw2c0YQY6 s1xunr81le1TduVAKNV4i4m6OylzQYAtm5sOd64K4Piiz6IXbyEVHti7sN0V4Lw4yRf4FifU98am5 IyI4cKMA==; Received: from [2001:8b0:10b:5:dca6:9c4e:f2fc:586d] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmDkf-0000000DbgJ-1Cke; Tue, 21 Jul 2026 16:55:29 +0000 Message-ID: Subject: Re: [RFC PATCH 0/2] KVM: x86/pmu: Let userspace disable SW accounting of emulated instructions From: David Woodhouse To: Sean Christopherson Cc: Luka Absandze , Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Alexander Graf Date: Tue, 21 Jul 2026 17:55:27 +0100 In-Reply-To: References: <20260720192221.72912-1-absandze@amazon.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-2DBTlJYs3xawvkRh/yhF" 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 --=-2DBTlJYs3xawvkRh/yhF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-07-21 at 09:47 -0700, Sean Christopherson wrote: > On Tue, Jul 21, 2026, David Woodhouse wrote: > > On Mon, 2026-07-20 at 19:22 +0000, Luka Absandze wrote: > > > On hosts that run guests with an *emulated* vPMU -- guest PMU MSR > > > accesses trap into KVM and each guest counter is backed by a host > > > perf_event -- the per-emulated-instruction PMU accounting added by co= mmit > > > 9cd803d496e7 ("KVM: x86: Update vPMCs when retiring instructions") is > > > pathologically expensive. > >=20 > > Given that the guest PMU MSR accesses are trapped... is there a reason > > we can't fold a *separate* count of emulated instructions into the > > value we return to the guest? > >=20 > > I guess the overflow would come late... but isn't that tolerable?=20 >=20 > Like ignoring emulated instructions entirely, it probably depends on the = guest. >=20 > > And we could probably impose a limit on how large the addend could be = =E2=80=94 even > > if we only reprogram the PMU once every 100 times, that's still a win? >=20 > Hmm, yeah, that'd be better than ignoring emulated instruction entirely, = and > would give userspace far better control over how shoddy KVM's emulation i= s.=C2=A0 Off > the cuff, the change would be fairly trivial too?=C2=A0 E.g. >=20 > diff --git arch/x86/kvm/pmu.c arch/x86/kvm/pmu.c > index 7f777049d328..c5f436c6f83f 100644 > --- arch/x86/kvm/pmu.c > +++ arch/x86/kvm/pmu.c > @@ -1084,7 +1084,8 @@ static void kvm_pmu_incr_counter(struct kvm_pmc *pm= c) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (!kvm_vcpu_has_mediated_pmu= (vcpu)) { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 pmc->emulated_counter++; > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 kvm_pmu_request_counter_reprogram(pmc); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 if (pmc->emulated_counter > pmu_something_something_tolerance) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 kvm_pmu_reques= t_counter_reprogram(pmc); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 return; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } >=20 We also want to add the same delta when the the guest reads the counter? --=-2DBTlJYs3xawvkRh/yhF Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT 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