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 F3955C61DA4 for ; Wed, 22 Feb 2023 10:10:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232117AbjBVKKA (ORCPT ); Wed, 22 Feb 2023 05:10:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48798 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231135AbjBVKJ6 (ORCPT ); Wed, 22 Feb 2023 05:09:58 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 764492E0C6 for ; Wed, 22 Feb 2023 02:09:57 -0800 (PST) Received: from zn.tnic (p5de8e9fe.dip0.t-ipconnect.de [93.232.233.254]) (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 092521EC0622; Wed, 22 Feb 2023 11:09:56 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1677060596; 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=efmGMNG9B+mdqMf7s/t0MQIi1wPRwzoJkvLtSbsvMt4=; b=TdG0IIN2Alqhrg53rQNmyPwAWswElPOPjVdW2xTC5Ls/U1W+H6QMMG/SWARbkcWGZiCeIz vyMHtdK7R67rbjlPbVTYINcl8aTuyiZE3jDIccbtWNb8s6pZ6PTgZa4Kr6keEiZCCwbaGs lUYnGRSamTer5pW+0/fjvanDac/IJMw= Date: Wed, 22 Feb 2023 11:09:51 +0100 From: Borislav Petkov To: Andrew Cooper Cc: Tavis Ormandy , linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: x86: AMD Zen2 ymm registers rolling back Message-ID: References: <0371ec3d-0899-f94a-7f21-21d805df2927@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <0371ec3d-0899-f94a-7f21-21d805df2927@citrix.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 22, 2023 at 09:38:09AM +0000, Andrew Cooper wrote: > This sounds suspiciously like an errata which was fixed with a ucode > update last year. Yes, it looks like it. Alternatively, you can try booting with "clearcpuid=xsaves" - that should take care of your observation too but yeah, you should rather update your microcode. HTH. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette