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 00D9DC64EC4 for ; Wed, 22 Feb 2023 08:33:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231130AbjBVIdp (ORCPT ); Wed, 22 Feb 2023 03:33:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229907AbjBVIdn (ORCPT ); Wed, 22 Feb 2023 03:33:43 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F11C3609D for ; Wed, 22 Feb 2023 00:33:26 -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 01FA61EC0622; Wed, 22 Feb 2023 09:33:24 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1677054805; 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=Pwf1mVBeC8lifWJo57TbIJVle0b9fZlWLzD9yuuHPCg=; b=oLnr/n70JfA77+w1i4y/di8j+EQdJbMUdYB3MFMINKurVnCGsnxPCPsEF1+v+DzITU85rk YKGCEIhanKHUltjhnwNSZOZZn32L2MRctoVuUB9LnR0a4lPICksbR+0XMnP4Auq/Rh3yq0 HQP5ZQXXcRqHY369AJAWH/tVRu3J8zg= Date: Wed, 22 Feb 2023 09:33:19 +0100 From: Borislav Petkov To: Tavis Ormandy Cc: linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: x86: AMD Zen2 ymm registers rolling back Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 21, 2023 at 10:40:07PM -0800, Tavis Ormandy wrote: > Hello, I'm experiencing a serious bug on AMD Zen2 that is causing > registers to "roll back" to previous values after a context switch. It probably doesn't matter all too much but which kernel are you running this on? Latest and greatest I hope... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette