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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 50C2FC2D0DB for ; Thu, 23 Jan 2020 15:05:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2395021835 for ; Thu, 23 Jan 2020 15:05:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fUBs/DqD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727523AbgAWPFI (ORCPT ); Thu, 23 Jan 2020 10:05:08 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:57542 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726232AbgAWPFH (ORCPT ); Thu, 23 Jan 2020 10:05:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579791906; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Vri1PiNggc4kMFOyjNBBzvcf8kkA+0uO3Ck4TLEP00Y=; b=fUBs/DqD+jSq16YTkx9azaiOWmjQvUIXeiFw4yYJKEEHxZBSwlwy1MBqo84LigISAJkf/g JUUmyRRTEQfwtv5jxwca+JGFb72+cqgdshIL8vbOkJidtQMo5s0eW/zEkVUeqbwU/A/TGe mt/VTInlIesix2EqdVk4u9nB9SuIjvE= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-317-iJ1eXOiQN7a8-IOVdqj0MQ-1; Thu, 23 Jan 2020 10:05:03 -0500 X-MC-Unique: iJ1eXOiQN7a8-IOVdqj0MQ-1 Received: by mail-wm1-f70.google.com with SMTP id y125so839613wmg.1 for ; Thu, 23 Jan 2020 07:05:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Vri1PiNggc4kMFOyjNBBzvcf8kkA+0uO3Ck4TLEP00Y=; b=naeaZt5qxwjkJgk/EzrgA6LyyQR77fFfir5vX6UZezc5lJ4oUWwEae1OmXFVZm2n1P 7/7k4wT2EKjRiOsmuaVKTaNyKJDFcWqBNoTtWA+/ddJXhIRsvnqdrU7626NuznK4jq8X yI0g7E4AdZE7CczYLlphpz5+hHAwqpTGC88LhJ3B52HOH/3CHQBIPSwUCuICar3rJjUK Tgsq73DtgigFbqyYJ+aegKJS7NGM1NDxJBWPKdEmQtLwCFzeoTTN4lKzN04LjmJxE5Y5 pXnCHp5Zdr3uP5zzSq0Mndr4Ze35c9m5tQDBDO0ZHbvMMfBEK+mamfwU77M3hgXEmlsQ 9K2w== X-Gm-Message-State: APjAAAVSWEvH9A7BKms5/iBEIYp+QQP7e7pyeTNcbtrH8us/8eA7g7I4 Nu04qdu9ApVZKe75tBHko+YEYi6y0tXaKreNL9RSE3ICLhy6HTjG2KkcQ6i+sNcwta7K4iAjOux cr7kYHEp6CNhf X-Received: by 2002:a1c:9a56:: with SMTP id c83mr4710494wme.79.1579791902852; Thu, 23 Jan 2020 07:05:02 -0800 (PST) X-Google-Smtp-Source: APXvYqwyzmBgLo2X+QxowpQ8W2rLbvoB593D5jfFwLuoy6KhhwN4Ns7zQHLLaFbW0YhjgklXIQ8fWw== X-Received: by 2002:a1c:9a56:: with SMTP id c83mr4710479wme.79.1579791902646; Thu, 23 Jan 2020 07:05:02 -0800 (PST) Received: from ?IPv6:2001:b07:6468:f312:b8fe:679e:87eb:c059? ([2001:b07:6468:f312:b8fe:679e:87eb:c059]) by smtp.gmail.com with ESMTPSA id d16sm3807788wrg.27.2020.01.23.07.05.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Jan 2020 07:05:02 -0800 (PST) Subject: Re: [PATCH 2/2] kvm: Add ioctl for gathering debug counters To: Alexander Graf , milanpa@amazon.com, Milan Pandurov , kvm@vger.kernel.org Cc: rkrcmar@redhat.com, borntraeger@de.ibm.com References: <20200115134303.30668-1-milanpa@amazon.de> <18820df0-273a-9592-5018-c50a85a75205@amazon.de> <8584d6c2-323c-14e2-39c0-21a47a91bbda@amazon.com> <668ea6d3-06ae-4586-9818-cdea094419fe@redhat.com> <30358a22-084c-6b0b-ae67-acfb7e69ba8e@amazon.com> <7f206904-be2b-7901-1a88-37ed033b4de3@amazon.de> <7e6093f1-1d80-8278-c843-b4425ce098bf@redhat.com> <6f13c197-b242-90a5-3f53-b75aa8a0e5aa@amazon.de> <3d3d9374-a92b-0be0-1d6c-82b39fe7ef16@redhat.com> <25821210-50c4-93f4-2daf-5b572f0bcf31@amazon.de> From: Paolo Bonzini Message-ID: <2e2cd423-ab6c-87ec-b856-2c7ca191d809@redhat.com> Date: Thu, 23 Jan 2020 16:05:01 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <25821210-50c4-93f4-2daf-5b572f0bcf31@amazon.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 23/01/20 15:58, Alexander Graf wrote: >> the case, of course it would be fine for me to use ONE_REG on a VM.  The >> part which I don't like is having to make all ONE_REG part of the >> userspace ABI/API. > > We don't have all of ONE_REG as part of the user space ABI today. Still those that exist cannot change their id. This makes them a part of the userspace ABI. > But I like the idea of a ONE_REG query interface that gives you the list > of available registers and a string representation of them. It would > make programming kvm from Python so easy! Yeah, wouldn't it? Milan, what do you think about it? Paolo