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=-6.3 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 9887AC433E9 for ; Tue, 9 Feb 2021 14:57:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4EDB264E7C for ; Tue, 9 Feb 2021 14:57:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232313AbhBIO5Z (ORCPT ); Tue, 9 Feb 2021 09:57:25 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:51602 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232139AbhBIO5H (ORCPT ); Tue, 9 Feb 2021 09:57:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612882541; 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=WSsdPlcWLs4B7/MYVeVITkDmFpb6BsySsmx2wFDfjIg=; b=RNL/CcDL+IAKBwA0EISQhdXGo6HzhQ1YzsL7iIrDlgqlcUCzqV4aKvaskaqqThhdmCKZ5v xvBPcOLRJhWWnrYLAEjC6n1jSBrTG0jmYyd2izIB+KLCe2dBf0Jn5t2n37k8dZkalkpkas fP2vA7J6ykQ/3EFodGn8cmgOXMm4uy0= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-468-EpDYcWexMQ-ru-vQ9l6rvg-1; Tue, 09 Feb 2021 09:55:40 -0500 X-MC-Unique: EpDYcWexMQ-ru-vQ9l6rvg-1 Received: by mail-wm1-f69.google.com with SMTP id x20so3122907wmc.0 for ; Tue, 09 Feb 2021 06:55:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=WSsdPlcWLs4B7/MYVeVITkDmFpb6BsySsmx2wFDfjIg=; b=oMWH1lr/eIVW9iyqOQ/EnIUiW+H//KNFstzWQn0xODY0wcTc65Y1lLJ/YowkvVwXhG 3EDKMOBTiNgjXi9+Mqu97s0vu7rimOUi0ZRqpDiqhsosCZMB/b5n3FcvfWJ1xkEnzcEW tubW1OQkpP6zjJvGYzx3zLQKGHe+A3CNsMjJkNZSDEpEWup7d+7q8ipEZ/vMwT84Y3H/ Z4IQyqf5TJFrcPJXarhN3B2vzsFiknat6fglSY+rFnW7gXZoHoXvKrVg9rCn34bhGuga 13YgSJFYhGmGIvW5m/f4szf5peleJALZ7ehKRRRy6gnGrO+scNTi5832cu77bC+enSj5 GVnA== X-Gm-Message-State: AOAM531Iga50jJKfDXyvfduNNfkiwNbX9Dw0ofye/JgPJY8Yjj1Vo/Xd Vi/yRZCPDGh1g3fFtuD0/ihlP+ORXBiQ4Wb+f3TaptCCnKTl+YkZ0Bw3wBW5KsHEXHBgXxci2oc 6GO0Ks18kKYYS X-Received: by 2002:adf:eb82:: with SMTP id t2mr13792137wrn.231.1612882538031; Tue, 09 Feb 2021 06:55:38 -0800 (PST) X-Google-Smtp-Source: ABdhPJzGiyD0i/pTC5CRicHdOTkBxICTMpZX9F+ZX+9eu4fC4Ozi+Yen5iR0i1cuW6uuuaqb68GylQ== X-Received: by 2002:adf:eb82:: with SMTP id t2mr13792098wrn.231.1612882537862; Tue, 09 Feb 2021 06:55:37 -0800 (PST) Received: from redhat.com (bzq-79-180-2-31.red.bezeqint.net. [79.180.2.31]) by smtp.gmail.com with ESMTPSA id x15sm19731236wro.66.2021.02.09.06.55.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Feb 2021 06:55:37 -0800 (PST) Date: Tue, 9 Feb 2021 09:55:32 -0500 From: "Michael S. Tsirkin" To: Adrian Catangiu Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, gregkh@linuxfoundation.org, graf@amazon.com, rdunlap@infradead.org, arnd@arndb.de, ebiederm@xmission.com, rppt@kernel.org, 0x7f454c46@gmail.com, borntraeger@de.ibm.com, Jason@zx2c4.com, jannh@google.com, w@1wt.eu, colmmacc@amazon.com, luto@kernel.org, tytso@mit.edu, ebiggers@kernel.org, dwmw@amazon.co.uk, bonzini@gnu.org, sblbir@amazon.com, raduweis@amazon.com, corbet@lwn.net, mhocko@kernel.org, rafael@kernel.org, pavel@ucw.cz, mpe@ellerman.id.au, areber@redhat.com, ovzxemul@gmail.com, avagin@gmail.com, ptikhomirov@virtuozzo.com, gil@azul.com, asmehra@redhat.com, dgunigun@redhat.com, vijaysun@ca.ibm.com, oridgar@gmail.com, ghammer@redhat.com Subject: Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver Message-ID: <20210209095350-mutt-send-email-mst@kernel.org> References: <1612200294-17561-1-git-send-email-acatan@amazon.com> <1612200294-17561-3-git-send-email-acatan@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1612200294-17561-3-git-send-email-acatan@amazon.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org > +The ``vmgenid`` driver uses ACPI events to be notified by hardware > +changes to the 128-bit Vm Gen Id UUID. That's ok, problem is ACPI event processing is asynchronous. What we need is thus to flush out ACPI events whenever userspace does a read, otherwise the value it gets will be stale. -- MST