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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E0F5C433EF for ; Tue, 11 Jan 2022 08:15:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348827AbiAKIPt (ORCPT ); Tue, 11 Jan 2022 03:15:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235106AbiAKIPt (ORCPT ); Tue, 11 Jan 2022 03:15:49 -0500 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AAB51C06173F; Tue, 11 Jan 2022 00:15:46 -0800 (PST) Received: by mail-pl1-x631.google.com with SMTP id l15so15974302pls.7; Tue, 11 Jan 2022 00:15:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:content-language:to:cc :references:from:organization:subject:in-reply-to :content-transfer-encoding; bh=65e4pY8c6IKP5/BwWsThn09+viwP4Cyof2rq2OFXBLA=; b=JLj76DTnuqGLWS3wL4xskV1uf4xVSbCIclOhGiKxT4Hc6rpcJ2AiCFloz539jmg1tB gYw2AQWFbPKnqcRywJmHXil9qd1TZzxd9Uin5bgWv9cOIHVXIaCWQJxBmJ3J6dMwxnuD RCCN3K2varbNOyS8dNBGUNpCvOyhnoTBuQl3mUGDDv7R4535j+zNflkkacYgjY+lVCfb 5yX+JJ1L4UCdyUZX800upmeHwDpO0iJo5XHvsYUVIiXhXjr6YGIh6+nBV4mV2RsymYYm tCTflUZQ2cUsjrEwh0Xb0SfRYGqfbNZbDiSUzOHwqakXFavykXv9zQTcyqxugKzeqlG4 y88A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent :content-language:to:cc:references:from:organization:subject :in-reply-to:content-transfer-encoding; bh=65e4pY8c6IKP5/BwWsThn09+viwP4Cyof2rq2OFXBLA=; b=e7+TSipJ6iA95JDrxnA6hcVb4kZYt/dSOK1aQlhZLwVhu9OzRbGcHlZLBiWnbmPJXz I6RH/ks44rEk5PFWuehq2NOqywNtlTOBuWT7QgY7QpxP9ScKLZotRgnuuDQdhfYVlZQd +FbeZRkCPKrELRo8eouAnk7k1Yln5mk/bfLYppHtJti+RzE6yWCeYDAAI0r+ftNQS2+I PVLvs4aHZRlfwgIvn4bX8sC23UK2iYfsyaG6+Ds162AngpAghDhor3MpWAH3XD9ufjvT ktr6F0MsN7xPG0mS1bc9IQFYN5myplu4ea8UE7VOef1cHqqZRVLHN/4QWbpBFZVWV7B1 TwyQ== X-Gm-Message-State: AOAM530UqBgVUP/DyF6Od9Xaj0A0FakWs0PPmvTWFgxZJEIKd7A1YZ34 D6ps8T/S0NsdtTOUNFPRk3Q= X-Google-Smtp-Source: ABdhPJwFGoWgo+kK/ZP3yeqM9tGaVtD51Vubm7aOGIatueuMYBzU5Sxlpw+VCc4s4DBYEVh0nCDXgQ== X-Received: by 2002:a17:90b:3ecc:: with SMTP id rm12mr1851434pjb.225.1641888946117; Tue, 11 Jan 2022 00:15:46 -0800 (PST) Received: from [192.168.255.10] ([103.7.29.32]) by smtp.gmail.com with ESMTPSA id g6sm7621531pgk.37.2022.01.11.00.15.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Jan 2022 00:15:45 -0800 (PST) Message-ID: <4afbaf27-04a9-91a6-f9fa-178e4624b482@gmail.com> Date: Tue, 11 Jan 2022 16:15:36 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: Xiaoyao Li Cc: Paolo Bonzini , Jim Mattson , Wanpeng Li , Vitaly Kuznetsov , Joerg Roedel , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson References: <20220110034747.30498-1-likexu@tencent.com> <80b40829-0d25-eb84-7bd7-f21685daeb20@gmail.com> <8a6e5b96-1191-7693-314a-1714cb7c9c9c@intel.com> From: Like Xu Organization: Tencent Subject: Re: [PATCH v2] KVM: x86/pt: Ignore all unknown Intel PT capabilities In-Reply-To: <8a6e5b96-1191-7693-314a-1714cb7c9c9c@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/1/2022 3:59 pm, Xiaoyao Li wrote: >> >> +#define GUEST_SUPPORTED_CPUID_14_EBX    \ >> +    (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5)) >> + >> +#define GUEST_SUPPORTED_CPUID_14_ECX    \ >> +    (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(31)) >> + > > I doubt BIT(3) of CPUID_14_ECX can be exposed to guest directly. > > It means "output to Trace Transport Subsystem Supported". If I understand > correctly, it at least needs passthrough of the said Transport Subsystem or > emulation of it. I'm not surprised that we can route Intel Guest PT output to a platform-specific trace endpoint (e.g., physical or emulated JTAG) as an MMIO debug port.