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 71901C433E0 for ; Wed, 29 Jul 2020 08:23:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 48095206D4 for ; Wed, 29 Jul 2020 08:23:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="izATLkqo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727992AbgG2IX1 (ORCPT ); Wed, 29 Jul 2020 04:23:27 -0400 Received: from us-smtp-delivery-74.mimecast.com ([216.205.24.74]:37696 "EHLO us-smtp-delivery-74.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726737AbgG2IX0 (ORCPT ); Wed, 29 Jul 2020 04:23:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1596011005; 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=8lrqZhx4wIlIKGfI1v+EKqO6jc0hqmda+j4PZMrvWEE=; b=izATLkqoGsmn4NG6MP7HxZydLZv+7lEfCEEwa7nofJYBi+idgLTcpHMgWzgWEP07esXa8C f5L9WvT7cLQ9N4h704UtbI0zELjZo0z6Hd67gptJjLBUcGkZejw7woN6ek+t+Ju1hvnVgn Sv/3byYdJZLX2gX2O05Gzf/+VF/RAKo= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-503-ftZZS5_ZPwyi0LUtVU8aog-1; Wed, 29 Jul 2020 04:23:23 -0400 X-MC-Unique: ftZZS5_ZPwyi0LUtVU8aog-1 Received: by mail-ej1-f72.google.com with SMTP id q9so8176495ejr.21 for ; Wed, 29 Jul 2020 01:23:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version; bh=8lrqZhx4wIlIKGfI1v+EKqO6jc0hqmda+j4PZMrvWEE=; b=rFZB6WetZknlpO+orpm9zFEyFYbk7WdZERShcpNWJdZH+lrdYifpe8JuwtEPHaCXpg E4z1KCQ51J8iJt1wng66hGnRrsX2dg3cBmeFbU/DYeFwf4QL4Uipc1/ppL7Ae7BHaYy3 Z2DO8O8hIjIB29IW1Q3wEK62/0foCQiKojg4z4sTuFKStxRVjgVQO+vf+fdrC5MvVLww u+EN2yxKV+2b06nasYwzFvv/AwiTVVNVTWnFdEAG6TZWGRlYeq2IvEAXDWBHkwsFaZ7j WuU0wJxivGd6xH8VY3sO4ZzWZpIveD1S8qb4s6Fo8NlIu0QXfwA31cZYnP5ipAXiqoYw Tt1w== X-Gm-Message-State: AOAM532HXldoz4VLx32oCl+yZQHTsyMzj6rnyw6C1Hd2LegufcDUvE+k l6QhZhfvszPwGbOmVg1W7Jj2kY0N/g+B/aHJT5pumZqW4VXsXiOjhH6E5H4c/FJ7G867vj1OehG 3lwF2KTqQKl9Q X-Received: by 2002:a17:906:c096:: with SMTP id f22mr19924869ejz.159.1596011002577; Wed, 29 Jul 2020 01:23:22 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyrtor48PKaJPzhZluQN3DnUZRQ0VogdZPOhAt3ZNs96b8Wg1nFDHyxjUTEMO1FmMqAUc0VVA== X-Received: by 2002:a17:906:c096:: with SMTP id f22mr19924858ejz.159.1596011002411; Wed, 29 Jul 2020 01:23:22 -0700 (PDT) Received: from vitty.brq.redhat.com (g-server-2.ign.cz. [91.219.240.2]) by smtp.gmail.com with ESMTPSA id g9sm609366ejf.101.2020.07.29.01.23.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jul 2020 01:23:21 -0700 (PDT) From: Vitaly Kuznetsov To: Jim Mattson , Alexander Graf Cc: Paolo Bonzini , Jonathan Corbet , Sean Christopherson , Wanpeng Li , Joerg Roedel , kvm list , linux-doc@vger.kernel.org, LKML , Aaron Lewis Subject: Re: [PATCH] KVM: x86: Deflect unknown MSR accesses to user space In-Reply-To: References: <20200728004446.932-1-graf@amazon.com> <87d04gm4ws.fsf@vitty.brq.redhat.com> Date: Wed, 29 Jul 2020 10:23:20 +0200 Message-ID: <87y2n2log7.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Jim Mattson writes: > On Tue, Jul 28, 2020 at 5:41 AM Alexander Graf wrote: >> ... >> While it does feel a bit overengineered, it would solve the problem that >> we're turning in-KVM handled MSRs into an ABI. > > It seems unlikely that userspace is going to know what to do with a > large number of MSRs. I suspect that a small enumerated list will > suffice. The list can also be 'wildcarded', i.e. { u32 index; u32 mask; ... } to make it really short. -- Vitaly