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 X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CCC22C433EA for ; Mon, 27 Jul 2020 08:34:47 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 962D520714 for ; Mon, 27 Jul 2020 08:34:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LaCsJUF9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 962D520714 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:58476 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jzyas-0004OB-Uh for qemu-devel@archiver.kernel.org; Mon, 27 Jul 2020 04:34:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49328) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jzyaF-0003rm-PE for qemu-devel@nongnu.org; Mon, 27 Jul 2020 04:34:07 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:44959 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jzyaD-0005Bs-Mm for qemu-devel@nongnu.org; Mon, 27 Jul 2020 04:34:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1595838843; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=vxAC7kiFS016cETpwk1rOgUT+R9geqEOY153JJ+pd38=; b=LaCsJUF9Dk5k0eenTZY3rihVA8Zs6u0GIlhm0hoGIq/FRlEWWYRh5Y9VV8bvOWPaqlrObs Vy9bUgKDeAFI//u1SsoxUbqeqk7VqwvEjALe7zlJJ51fhKPt6n3rtkQK8X+EiYwuMZudJN my1HETqiAHO4v6co4TztPNyd4HrXshs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-255-GZ56-Ia_NQGkn41QPapVmw-1; Mon, 27 Jul 2020 04:34:01 -0400 X-MC-Unique: GZ56-Ia_NQGkn41QPapVmw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 70B4B800468; Mon, 27 Jul 2020 08:34:00 +0000 (UTC) Received: from kamzik.brq.redhat.com (unknown [10.40.194.132]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 32D3560BF4; Mon, 27 Jul 2020 08:33:59 +0000 (UTC) Date: Mon, 27 Jul 2020 10:33:56 +0200 From: Andrew Jones To: Peter Maydell Subject: Re: [PATCH 0/3] hw/arm/virt: Introduce kvm-steal-time Message-ID: <20200727083356.6pr6f5ph5wh2aev6@kamzik.brq.redhat.com> References: <20200711101033.47371-1-drjones@redhat.com> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=207.211.31.81; envelope-from=drjones@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/27 03:37:14 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-arm , QEMU Developers , Beata Michalska Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Jul 20, 2020 at 11:16:41AM +0100, Peter Maydell wrote: > On Sat, 11 Jul 2020 at 11:10, Andrew Jones wrote: > > > > KVM supports the ability to publish the amount of time that VCPUs > > were runnable, but not running due to other host threads running > > instead, to the guest. The guest scheduler may use that information > > when making decisions and the guest may expose it to its userspace > > (Linux publishes this information in /proc/stat). This feature is > > called "steal time" as it represents the amount of time stolen from > > a guest by scheduling out its VCPUs. To enable this feature KVM > > userspace must provide a memory region that will be used to publish > > the information to the guest. The memory region is typical migratable > > region. The GPA of the region is given to KVM through a VCPU device > > ioctl interface. This feature is only available for 64-bit hosts > > running 64-bit guests. > > > > This series provides the QEMU support of this feature. It will > > be enabled by default for 5.1 machine types and later, but may > > be disabled with a new CPU property "kvm-steal-time". > > Just a note that this has missed 5.1, but I'll review it at > some point for 5.2. > Yup. No problem. I was out on vacation all last week, so there wasn't a chance for me to follow up until now anyway. Thanks for the review. I'll get to the responses / respinning tomorrow after I dig out of my email backlog. drew