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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D5DEC04A68 for ; Thu, 28 Jul 2022 12:36:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238726AbiG1MgC (ORCPT ); Thu, 28 Jul 2022 08:36:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237841AbiG1Mf7 (ORCPT ); Thu, 28 Jul 2022 08:35:59 -0400 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92004683D2 for ; Thu, 28 Jul 2022 05:35:58 -0700 (PDT) Received: from zn.tnic (p57969665.dip0.t-ipconnect.de [87.150.150.101]) (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 C031F1EC064D; Thu, 28 Jul 2022 14:35:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1659011752; 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=fZH/aHwPNis8ybZaSyXYhkjGxh0r6LUJLJQXCmExCPc=; b=sWEY4czH5+ZcnhFRd9TEphxTMLyNW8xdM77Ibauxbu+Dyl1Swgpaca7YLZ9IynqNG9HvAM Zmt9/b+zrvVV/INFmC0NbEBumCPisBe3008CTjjE+Qii6b/ainFHzC+9B3A0DnvxplgLd2 k+eQsuUugtX+boV/l9PDBFcdoQNtuTA= Date: Thu, 28 Jul 2022 14:35:48 +0200 From: Borislav Petkov To: Thadeu Lima de Souza Cascardo Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Dimitri John Ledkov , Peter Zijlstra Subject: Re: [PATCH] x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available Message-ID: References: <20220728122602.2500509-1-cascardo@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20220728122602.2500509-1-cascardo@canonical.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org drop stable@ On Thu, Jul 28, 2022 at 09:26:02AM -0300, Thadeu Lima de Souza Cascardo wrote: > Some cloud hypervisors do not provide IBPB on very recent CPU processors, > including AMD processors affected by Retbleed. Which hypervisors are those? How relevant is that use case? How do I reproduce it here? Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette