Received: by 10.223.185.116 with SMTP id b49csp3634528wrg; Mon, 26 Feb 2018 03:31:18 -0800 (PST) X-Google-Smtp-Source: AH8x2258NV/yNARJfb0Ez8TWFuLyJ0wwMgtl9UicaSEEh0sam48+cQNixkl5yMKXZp28e8JR1U+P X-Received: by 2002:a17:902:522:: with SMTP id 31-v6mr10350039plf.122.1519644678207; Mon, 26 Feb 2018 03:31:18 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1519644678; cv=none; d=google.com; s=arc-20160816; b=NHwbCwd4hLVH7a+GishW378hEgL8mCBp81DoIJqGiYG+KbC+sFGL2L5uXCe5OMCXcn GzNZLWQi76AcqZ6+e1d8Lkejc8GWzCklT3mmbVCItji8cfDj8EjCESX+mcpLy84x3iOk k5TCdbcLMO0zCMDeH2r1GUE/HmO5Y9TJHLqQho+1qR/yvTHwqKNM55/1tBxNPsoDgq2a 37zvLz/IKiOlfUXPjvSJJJ9fUMPrYAUBS/qiua4UQIJXMs3nB+tELIwpxnU3FmxaEofm hsAL7aIh/u//OLU6gmqyvV2z8VsmxezuNSgCYkCycX22xgECDH7ZEc4EtjaQLuPkbJHk awkA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:arc-authentication-results; bh=Dnr+6/D9WJWgQD4LHtHVGT7KQVgwTANdE/BCP2fFDiY=; b=uASQB5+OXbFRIxQHRbSM5r6jsHKoqXt2bKJbfDTriATBIzISWrlF4F3jqsJDQwJXyu X6eXM0Ip+pBHEiVJMsir5ai0a71Y+eGkzGqJuCrM7aQhcigVYcGN6HdWKQCamDngjW5N nD3YOB+E4i+1PBQGVZ/N3qllqNc6UaqBLmuhXN3YZmkFeSndWvN014oU2Kt2zHr9EZof ivJyn/V569RvWawpmrlfQE5oZP+0Uz74LNOPhi+HBS/itSxk9TvvAShEWUo/DdXnE0Hf vxVRzxfasxxMqwrfOavvaEwnJFmRRqeCwIC+T4rCHitbPqNQwlCMrKXBEncafoOg7+Rn 7rRw== ARC-Authentication-Results: i=1; mx.google.com; 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f69si6594625pfd.211.2018.02.26.03.31.03; Mon, 26 Feb 2018 03:31:18 -0800 (PST) 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; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752728AbeBZLaY (ORCPT + 99 others); Mon, 26 Feb 2018 06:30:24 -0500 Received: from mail.skyhub.de ([5.9.137.197]:52542 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752353AbeBZLaU (ORCPT ); Mon, 26 Feb 2018 06:30:20 -0500 X-Virus-Scanned: Nedap ESD1 at mail.skyhub.de Received: from mail.skyhub.de ([127.0.0.1]) by localhost (blast.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id miV8Fx49_jbW; Mon, 26 Feb 2018 12:30:19 +0100 (CET) Received: from pd.tnic (p200300EC2BCE210020411134B639594E.dip0.t-ipconnect.de [IPv6:2003:ec:2bce:2100:2041:1134:b639:594e]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 2FB5F1EC098E; Mon, 26 Feb 2018 12:30:19 +0100 (CET) Date: Mon, 26 Feb 2018 12:30:00 +0100 From: Borislav Petkov To: Wanpeng Li Cc: LKML , kvm , Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= Subject: Re: [PATCH] KVM: X86: Allow userspace to define the microcode version Message-ID: <20180226113000.GC4377@pd.tnic> References: <1519629838-4898-1-git-send-email-wanpengli@tencent.com> <20180226094148.GA15539@pd.tnic> <20180226104921.GA4377@pd.tnic> <20180226111630.GB4377@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.3 (2018-01-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 26, 2018 at 07:25:28PM +0800, Wanpeng Li wrote: > Both are the same values set by kvm userspace. This still doesn't answer my question what "the non-sensical value which is written by the guest will not reflect to guest-visible microcode revision" means? > This is correct. The link explains why the userspace sets microcode > revision is still needed. Why is it still needed? -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.