Received: by 2002:a25:8b12:0:0:0:0:0 with SMTP id i18csp2490965ybl; Mon, 19 Aug 2019 02:58:28 -0700 (PDT) X-Google-Smtp-Source: APXvYqwagGNGbygDq30Phq83SD5m3d0FvzniI/V+JGpV8baTzvvkF9Y84jeFxLJjJrPYYh4VVI8o X-Received: by 2002:a17:902:d70a:: with SMTP id w10mr20408284ply.251.1566208708748; Mon, 19 Aug 2019 02:58:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1566208708; cv=none; d=google.com; s=arc-20160816; b=AzI5aFB0pJGoNOYZR05L6Z4SFJQoLCgsG0vgufupq1uCQeV6Mb7omt2AHI7Armr5ct GjYWJjbAegO99ChOMrAIsmax3bcfXtNBqRRvte/clCYRRjXZoicxsBSx/vZp6sC8MhkW T6JcCFgv2B7cnx6/ATUAWsRtvglOgRjSEgC1cKBtvYm8W3L/h00digPHgheW/WL3bDEp 7hpgPdcFH+gJAWzs0P5XJExHL50X+smEv8jC+cjGuOsrgh81ulc+bt2+ZEnBxAqAKae3 m8V42ndujQAq3MG64vvJm2f1D0Qr6eL5R7zZOZoTvJaFyEJZgyg/GdU/VRiclVHav/fy vqHA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject:dkim-signature; bh=iveYkg8kU/7ePY7D1PCLQ4/L7oW5zWX3wxHw6b4m958=; b=0qllT3vMFDxNXxbg/uTWI5gGqbVSaczuSLC+L2Hja/7Dr6/k/FnMmT+Ux4qoucfsTf WdmL0OAvPeemg3I1EXTuHUrRoE+V9ka2iySF5Dpmwc5vvm0f/PSTPNxVh/cXg/KdNGg6 h18aYqwHPzibR9Dxmh88zj6cU0tnQ3kdC1rMwYZ86EvHyRPh1j/SheuFbQ9fuDO1HUN8 IIT2Ld98kHibqXrLWpfv+3/icDWEo0SaMF02TTSaPQXKuH5nStydfo1ZEw15tvmWqp6k PLS84Ux9HqozKWFJkPjineqMD4WD9U7NIxBsdrWGms8OxwyL/xA439ibw6SgwGPiCIrv lrRw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.com header.s=amazon201209 header.b=OXw2OhL9; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b3si9478401pgq.112.2019.08.19.02.58.13; Mon, 19 Aug 2019 02:58:28 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@amazon.com header.s=amazon201209 header.b=OXw2OhL9; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726755AbfHSJ50 (ORCPT + 99 others); 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