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[2620:137:e000::1:20]) by mx.google.com with ESMTP id q11-20020a17090a9f4b00b001f4e732b3c4si1992056pjv.154.2022.08.17.11.21.05; Wed, 17 Aug 2022 11:21:16 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=geMB85pA; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231939AbiHQSNb (ORCPT + 99 others); Wed, 17 Aug 2022 14:13:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45068 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230055AbiHQSN3 (ORCPT ); Wed, 17 Aug 2022 14:13:29 -0400 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69094248D0 for ; Wed, 17 Aug 2022 11:13:26 -0700 (PDT) Received: from zn.tnic (p200300ea971b98b0329c23fffea6a903.dip0.t-ipconnect.de [IPv6:2003:ea:971b:98b0:329c:23ff:fea6:a903]) (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 5E5C51EC0409; Wed, 17 Aug 2022 20:13:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1660760000; 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:in-reply-to:in-reply-to: references:references; bh=CavvB/5aPSIX99FCHQlgUNGl6CCYVLu+Q1uLFpQ5Tno=; b=geMB85pAivpEEkhsjYKpPFr/Mngbptzaumn5dktRSVsUu5pf546qEp+O55JMUm8bmGxK1v MgyVVSzzMlBYDGw5EBdLpSiDqkpbNzj0WoilFl8RV8ShpZ/fKF5ii6NxsPmJOYqekFlNZ7 rJ6JK58+bGQmS3L/iwUPio2Vv72APA0= Date: Wed, 17 Aug 2022 20:13:15 +0200 From: Borislav Petkov To: Ashok Raj Cc: Ashok Raj , X86 ML , Andrew Cooper , LKML , =?utf-8?Q?=C8=98tefan?= Talpalaru Subject: Re: [PATCH] x86/microcode/AMD: Attempt applying on every logical thread Message-ID: References: <20220814120026.16118-1-bp@alien8.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 17, 2022 at 03:29:04PM +0000, Ashok Raj wrote: > What I meant was the patch removed any and all revid checks *completely* > Instead of even limiting to == checks. I just tried downgrading the microcode on an AMD box. The hardware wouldn't accept the MSR write with the lower patch ID and the higher patch ID remained. I'll find out whether this is universally the case on AMD. > So forget the hardware testing part. This is a complex flow for > late-load and how can we get more people to test it today in the > community? > Do we have a more scalable way to support it today? You're not reading my mails. Lemme repeat: microcode loading is a dangerous business, especially the late thing. I'm certainly not going to expose that to people if there's no merit. The only merit for loading the same revision is for testing purposes. If you're about to test stuff, you can just as well patch the microcode loader to do what you want it to, like I just did. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette