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=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 33A10C3A59D for ; Mon, 19 Aug 2019 09:57:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F38A92184D for ; Mon, 19 Aug 2019 09:57:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="OXw2OhL9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726949AbfHSJ50 (ORCPT ); Mon, 19 Aug 2019 05:57:26 -0400 Received: from smtp-fw-2101.amazon.com ([72.21.196.25]:55961 "EHLO smtp-fw-2101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726343AbfHSJ50 (ORCPT ); Mon, 19 Aug 2019 05:57:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1566208645; x=1597744645; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=iveYkg8kU/7ePY7D1PCLQ4/L7oW5zWX3wxHw6b4m958=; b=OXw2OhL9Jt8sS34SOOmkcz5qnle3lPjo4a+0dWQ1KLgmn5GHf/hoWuwK tHHE7NMFlb5AgbO4I/UDMdsaaWwlcDr8h9FyeHmnsiS1vtfLGIw9oQvWe wAJhL7jQcLGu0J02hT+VOOuAAEGFHp/A5cwnN+JoSZ2SLFGlXFiaawmXO I=; X-IronPort-AV: E=Sophos;i="5.64,403,1559520000"; d="scan'208";a="747344503" Received: from iad6-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-2b-baacba05.us-west-2.amazon.com) ([10.124.125.2]) by smtp-border-fw-out-2101.iad2.amazon.com with ESMTP; 19 Aug 2019 09:57:19 +0000 Received: from EX13MTAUWC001.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2b-baacba05.us-west-2.amazon.com (Postfix) with ESMTPS id 380BFA1D77; Mon, 19 Aug 2019 09:57:19 +0000 (UTC) Received: from EX13D20UWC001.ant.amazon.com (10.43.162.244) by EX13MTAUWC001.ant.amazon.com (10.43.162.135) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Mon, 19 Aug 2019 09:57:18 +0000 Received: from 38f9d3867b82.ant.amazon.com (10.43.161.67) by EX13D20UWC001.ant.amazon.com (10.43.162.244) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Mon, 19 Aug 2019 09:57:16 +0000 Subject: Re: [PATCH v2 04/15] kvm: x86: Add per-VM APICv state debugfs To: "Suthikulpanit, Suravee" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" CC: "pbonzini@redhat.com" , "rkrcmar@redhat.com" , "joro@8bytes.org" , "jschoenh@amazon.de" , "karahmed@amazon.de" , "rimasluk@amazon.com" , "Grimm, Jon" References: <1565886293-115836-1-git-send-email-suravee.suthikulpanit@amd.com> <1565886293-115836-5-git-send-email-suravee.suthikulpanit@amd.com> From: Alexander Graf Message-ID: Date: Mon, 19 Aug 2019 11:57:13 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1565886293-115836-5-git-send-email-suravee.suthikulpanit@amd.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.43.161.67] X-ClientProxiedBy: EX13D13UWB001.ant.amazon.com (10.43.161.156) To EX13D20UWC001.ant.amazon.com (10.43.162.244) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15.08.19 18:25, Suthikulpanit, Suravee wrote: > Currently, there is no way to tell whether APICv is active > on a particular VM. This often cause confusion since APICv > can be deactivated at runtime. > > Introduce a debugfs entry to report APICv state of a VM. > This creates a read-only file: > > /sys/kernel/debug/kvm/70860-14/apicv-state > > Signed-off-by: Suravee Suthikulpanit Shouldn't this first and foremost be a VM ioctl so that user space can inquire its own state? Alex