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 11B76ECAAD8 for ; Wed, 21 Sep 2022 17:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230418AbiIURL7 (ORCPT ); Wed, 21 Sep 2022 13:11:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229886AbiIURLy (ORCPT ); Wed, 21 Sep 2022 13:11:54 -0400 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF4EC9C200; Wed, 21 Sep 2022 10:11:53 -0700 (PDT) Received: from zn.tnic (p200300ea9733e77f329c23fffea6a903.dip0.t-ipconnect.de [IPv6:2003:ea:9733:e77f: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 1E84D1EC058A; Wed, 21 Sep 2022 19:11:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1663780308; 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=zZihCniDI8tfhFO4vqwAEpD+8GtCUUxL/p4YLiWpZg8=; b=UoZZutyWNC3FkK5dRPhoALhO+RzO67cnT86qzhc66sA7G0/7VcD1vBJE18zEGNgOOkgHF4 ekgJCTzq5m/vDM2gyqwoWg7KJd+wkJScFmkyvK2NP+o8k+fzvEwNuvF5eCekGBbAyt9+vJ vBqgju55puczFtlL8EIcLy1wkptYRno= Date: Wed, 21 Sep 2022 19:11:42 +0200 From: Borislav Petkov To: Jim Mattson Cc: Sean Christopherson , Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Paolo Bonzini , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH v2 0/3] KVM: EFER.LMSLE cleanup Message-ID: References: <20220920205922.1564814-1-jmattson@google.com> 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 Wed, Sep 21, 2022 at 09:23:40AM -0700, Jim Mattson wrote: > AMD defined the 64-bit x86 extensions while Intel was distracted with > their VLIW science fair project. In this space, Intel produces AMD64 > compatible CPUs. Almost-compatible. And maybe, just maybe, because Intel were probably and practically forced to implement AMD64 but then thought, oh well, we'll do some things differently. > The definitive specification comes from AMD (which is sad, because > AMD's documentation is abysmal). Just don't tell me the SDM is better... But you and I are really talking past each other: there's nothing definitive about a spec if, while implementing it, the other vendor is doing some subtle, but very software visible things differently. I.e., the theory vs reality point I'm trying to get across. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette