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 191C9C4167B for ; Tue, 31 Oct 2023 16:52:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346991AbjJaQwJ (ORCPT ); Tue, 31 Oct 2023 12:52:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346944AbjJaQv4 (ORCPT ); Tue, 31 Oct 2023 12:51:56 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBF8B3A97; Tue, 31 Oct 2023 09:34:53 -0700 (PDT) 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=GOVRCwbjS2+Vyp5h9ZzGjoMP9lCkkl8D/iU/MwGDsDw=; b=eXlxhJXSgeNrpXzOMILj8ZLLG4 F6vC2BmUus/xx+HFWRMS5qsKAVVv693EMsvg5XFc6zB6QaIc960uilkbFN0epjVOQkaleVWaS7Atn qUB/H/ZIOP4sKy04TN0v0Eos5px2dOTPEUWKLnl4r494DLIWpMgs90Lx+6U+FvBv63ib9p/GQ2n7W XfocYGf7old3FCMijfIv6j8Gra4A77bsI6V3fSUe6vem/HZKjdbuCm4eC5qwMexqEa+zrqr1uaW3D 0S3MA/1KAro4G+FY91iRYIBYFIrmFjkTGOAuRTbZ6Go0ER08jvCeclK1iUZrJH4w4QBk74WkIr8sm gQzqzJdw==; Received: from [2001:8b0:10b:5:7a00:e590:2205:b5e1] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qxrhX-00B7wz-Le; Tue, 31 Oct 2023 16:34:47 +0000 Message-ID: <908ad29b56fbe5e5f4d99e477e96fbd9d03ba4c6.camel@infradead.org> Subject: Re: [PATCH] KVM: x86/xen: improve accuracy of Xen timers From: David Woodhouse To: paul@xen.org, Paul Durrant , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" Date: Tue, 31 Oct 2023 16:34:46 +0000 In-Reply-To: References: <96da7273adfff2a346de9a4a27ce064f6fe0d0a1.camel@infradead.org> <1a679274-bbff-4549-a1ea-c7ea9f1707cc@xen.org> <6c9671b4-d997-42ac-9821-06accb97357f@xen.org> <1DCDC3DB-81E8-426C-AF4B-AA7CA2C1271E@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xID9vXOJmXBHPB0OpzV/" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-xID9vXOJmXBHPB0OpzV/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-31 at 12:22 +0000, Paul Durrant wrote: >=20 > >=20 > > As I said, this patch stands even *after* we fix kvmclock, because > > it handles the timer delta calculation from an single TSC read. > >=20 > > But overengineering a timer reset on KVM_REQ_CLOCK_UPDATE would not. >=20 > I'm not sure what you intend to do to kvmlock, so not sure whether we'll= =20 > still need the __pvclock_read_cycles(&vcpu->arch.hv_clock, guest_tsc) > but this patch (with the extra check on validity of hv_clock) does fix= =20 > the drift so... >=20 > Reviewed-by: Paul Durrant Ta. And no, I'm not quite sure what I'm going to do with kvmclock for the general case yet. The more I look at it, the more I realise how broken it is. Last week I thought it was just about the way KVM 'jumps' the kvmclock and yanks it back to the host's CLOCK_MONOTONIC_RAW, but I thought KVM at *least* managed to do it right between those times. But no, this patch is addressing the fact that even *without* those clock jumps, KVM doesn't manage to calculate the guest clock the same way that it tells the guest to... and thus doesn't get the same results :) I think it involves get_kvmclock_ns() using the frequency given in the KVM-wide (not per-vCPU) KVM_SET_TSC_KHZ ioctl, and scaling via that to get the guest clock. That should match, without having to have a specific vCPU's hv_clock to play with. And maybe we can also have a get_kvmclock_ns_at() which takes a host TSC value, and the timer code from this patch can use that instead of using __pvclock_read_cycles() directly. That's probably the easy part. Fixing the 'resync' to CLOCK_MONOTONIC_RAW, while keeping things working for the now- considered-pathological !CONSTANT_TSC case, will be slightly more fun. As well as suspend etc. in the CONSTANT_TSC case, of course. And replacing that stupid KVM_CLOCK_REALTIME with something that uses CLOCK_TAI. 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