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 73497C54FCB for ; Sat, 25 Apr 2020 13:19:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F23D2071E for ; Sat, 25 Apr 2020 13:19:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dUNLV25q" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726188AbgDYNTb (ORCPT ); Sat, 25 Apr 2020 09:19:31 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:28975 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726060AbgDYNTb (ORCPT ); Sat, 25 Apr 2020 09:19:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1587820770; 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=ZURiLBETOzpWxA+m+Ly+zcrAkCfuj4ARVrSBfsuIAdg=; b=dUNLV25qYQXn5GRNAZJUuT0wBn5WdiFx4vknSkgb8ubRBPFbSV1C76wwMU2xh7f/rm7Fh+ vio3d3xSLO8HJW32bOUI9vnM9ctqIg2SBRHiMrmiluXIXhNg8+3VQ/olQY3tVMYUgb3zJS LorlUJavV/ycQDqtSKqQBAP7w8xaKhY= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-134-WkiLUkXUPJCf9Iq7Z2YeZw-1; Sat, 25 Apr 2020 09:19:28 -0400 X-MC-Unique: WkiLUkXUPJCf9Iq7Z2YeZw-1 Received: by mail-wm1-f72.google.com with SMTP id 14so5825734wmo.9 for ; Sat, 25 Apr 2020 06:19:27 -0700 (PDT) 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=ZURiLBETOzpWxA+m+Ly+zcrAkCfuj4ARVrSBfsuIAdg=; b=mLmiZSbtmAyVdNUdrlXF0eqHfeBEVi3D9106+FKC6avbbsUq8U6FgfxjFCiIZz75ib ndBinPPCmhgRhQBYsT6YQolST+TCQzuvW36TmwuD8JQmQyTuTARRyNTD5rbl5YTc01o2 HxGI+WuhFmg84Bqc0RoxebISvCK0/RtJtBoCfYjyGuEqaY1870TOzShFgqj8IVblChw+ sATtb+q0zxACgto/alSuw9Y2yfw/Ki/56ohlW13hNNz3EyfxQJYV45wBwJp2DaHwWSG6 dRUd4MoU8u+eOCwZqQFyomjJcG1AwFv+RCLTNreZS+qlNEUf92LLWQuqPcHybqVEKTsZ 4hVQ== X-Gm-Message-State: AGi0PuZYL7XnbtK1krugeSunv52gldvd01yzIZcrbW4oLyADRg372pSn Yl2xJdc1BVFEGjm3GnqoWzLt8pzLEvtnvfQuD+8xbaml4wCeNUiLjE9hnjyFOlIEi5VX0kaBMFu a//dEs/8SFjaUK7h+KV65WMgw X-Received: by 2002:a7b:c642:: with SMTP id q2mr16619781wmk.41.1587820766823; Sat, 25 Apr 2020 06:19:26 -0700 (PDT) X-Google-Smtp-Source: APiQypJXwcuRtpHk4zpLOp3jvcBubezJLdQBQ3UTl4H8+n7Honsj/U58BP1wRrfhHGtK6n55KUIt+Q== X-Received: by 2002:a7b:c642:: with SMTP id q2mr16619766wmk.41.1587820766602; Sat, 25 Apr 2020 06:19:26 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:d0a0:f143:e9e4:2926? ([2001:b07:6468:f312:d0a0:f143:e9e4:2926]) by smtp.gmail.com with ESMTPSA id a125sm7153885wme.3.2020.04.25.06.19.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 25 Apr 2020 06:19:26 -0700 (PDT) Subject: Re: [PATCH v11 5/9] KVM: X86: Refresh CPUID once guest XSS MSR changes To: Sean Christopherson , Yang Weijiang Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, jmattson@google.com, yu.c.zhang@linux.intel.com References: <20200326081847.5870-1-weijiang.yang@intel.com> <20200326081847.5870-6-weijiang.yang@intel.com> <20200423173450.GJ17824@linux.intel.com> From: Paolo Bonzini Message-ID: <6e1076a5-edbf-e8fe-dd99-fbb92f3cc8d0@redhat.com> Date: Sat, 25 Apr 2020 15:19:24 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200423173450.GJ17824@linux.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/04/20 19:34, Sean Christopherson wrote: >> if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) >> supported_xss = 0; >> + else >> + supported_xss = host_xss & KVM_SUPPORTED_XSS; > Silly nit: I'd prefer to invert the check, e.g. > > if (kvm_cpu_cap_has(X86_FEATURE_XSAVES)) > supported_xss = host_xss & KVM_SUPPORTED_XSS; > else > supported_xss = 0; > Also a nit: Linux coding style should be supported_xss = 0; if (kvm_cpu_cap_has(X86_FEATURE_XSAVES)) supported_xss = host_xss & KVM_SUPPORTED_XSS; Paolo