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 5E352191F92; Tue, 20 Aug 2024 15:42:18 +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=1724168543; cv=none; b=POQehD2wsqc9UqDpSKKv1WGV2c4TNajQhLGmwrXBVUw9r/DVhwoTTX0kB1dNYm9Gmwcg2xDYdtg/pCFauwCelOXERlofMQ4/zcNoXQORnR+wwGePqxxYRgyYtp9MEMOa0Tso1qbHiXLgeM77TdK/B4uGWa6XpJI/nqBIZ2uxZFo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724168543; c=relaxed/simple; bh=Ho2WZv7W0O/hHM9CFlRHRdevUWdWaY+S13BIdXz64Ns=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=mh1z0fK3b3QBPDo0fcHNNZadwc+m3dZi6yvQUzft7QQKqiS17gt6zvvTnEhHVERPaa2jzLWPi6IDG1Ry4pmrNEJO4kmxIO2dP8nRNhgoTZmC1ifi5EbH7Z4bl+r5f9KwoHDPCDwsxuEp8I7ot4T091aDgnlQSx1kTY5VJi1GIso= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=SRtW28zb; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="SRtW28zb" 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=Ho2WZv7W0O/hHM9CFlRHRdevUWdWaY+S13BIdXz64Ns=; b=SRtW28zbPoGdrg9T1fd2qOLoBM syZe/s7ASB+fB1Oh95xCUP7cmKb+/fifF8coQWwt0UPz3zOVHcV+OBsJBa2oq2+gZuTzuKhlWn/OB zFTmW6LkRXSNRpsxRgVTcuu2xOlBiivgn2Ll89hPZR0LNrMDljZed82WzMeZuLvdwxYdclokUmOwl xAYLKbxOv9HcVDXV/53mtZj5L08LsrteGoeEdC2S2wi84Ndn/qKRz5RvDmArWGWTmTsBOJkM8RD/l ShrvfGtWR7PKiG8yrLwjDqKGzuDzCIq44vaeCIluRiUEvP/F1u7iV3DraEgsMMNSKNIGm5W63mfFr mH+Tt9gw==; Received: from [2001:8b0:10b:5:cb53:8564:1f06:36f6] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgQzq-000000087KZ-1AtS; Tue, 20 Aug 2024 15:42:10 +0000 Message-ID: <35cac418a6b84fc64709d64d2b05116d5557b657.camel@infradead.org> Subject: Re: [RFC PATCH v3 20/21] KVM: x86/xen: Prevent runstate times from becoming negative From: David Woodhouse To: Steven Rostedt Cc: Sean Christopherson , kvm@vger.kernel.org, Paolo Bonzini , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Paul Durrant , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Shuah Khan , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, jalliste@amazon.co.uk, sveith@amazon.de, zide.chen@intel.com, Dongli Zhang , Chenyi Qiang Date: Tue, 20 Aug 2024 16:42:09 +0100 In-Reply-To: <20240820110814.7d4117fd@gandalf.local.home> References: <20240522001817.619072-1-dwmw2@infradead.org> <20240522001817.619072-21-dwmw2@infradead.org> <6f805099c5751a3092ee5f198fffb83673ba91ee.camel@infradead.org> <20240820110814.7d4117fd@gandalf.local.home> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vFXcu5NpbCv95218eMrB" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-vFXcu5NpbCv95218eMrB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-08-20 at 11:08 -0400, Steven Rostedt wrote: > On Tue, 20 Aug 2024 11:22:31 +0100 > David Woodhouse wrote: >=20 > > On Thu, 2024-08-15 at 21:39 -0700, Sean Christopherson wrote: > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0vx->last_steal =3D run_d= elay; > > > > + > > > > +=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 clock time wen= t backwards, stop updating > > > > until it > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * catches up (or the ru= nstates are reset by > > > > userspace). > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */=C2=A0=20 > > >=20 > > > I take it this is a legitimate scenario where userpace sets KVM > > > clock and then > > > the runstates, and KVM needs to lend a hand because userspace > > > can't do those two > > > things atomically?=C2=A0=20 > >=20 > > Indeed. Will update the comment to make that more obvious. > >=20 > > Thanks for the rest of the review on this series. I'll go through > > in > > detail and update it, hopefully this week. >=20 > Hmm, is this related at all to this: >=20 > =C2=A0 > https://lore.kernel.org/all/20240806111157.1336532-1-suleiman@google.com/ No, but patch 21 in this same series is. --=-vFXcu5NpbCv95218eMrB Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 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