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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22431C433EF for ; Tue, 4 Jan 2022 21:05:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7B69F6B0074; Tue, 4 Jan 2022 16:05:17 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 766226B0078; Tue, 4 Jan 2022 16:05:17 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 606576B007B; Tue, 4 Jan 2022 16:05:17 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0183.hostedemail.com [216.40.44.183]) by kanga.kvack.org (Postfix) with ESMTP id 4DAD66B0074 for ; Tue, 4 Jan 2022 16:05:17 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 0156792DFC for ; Tue, 4 Jan 2022 21:05:17 +0000 (UTC) X-FDA: 78993835032.15.17C169F Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by imf09.hostedemail.com (Postfix) with ESMTP id 8F516140007 for ; Tue, 4 Jan 2022 21:05:06 +0000 (UTC) Received: from zn.tnic (dslb-088-067-202-008.088.067.pools.vodafone-ip.de [88.67.202.8]) (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 9145B1EC0453; Tue, 4 Jan 2022 21:56:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1641329819; 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=6KjE4zfdnoJa8VcbKr5tWykH8nZeyvMUacQiyUUGOVY=; b=nLvokjXzEdmDvpUARTmnGiFS3Asc47jqMMaRZkBcWW7StoAsBmGlZGPfBmKwKTBjBJedXN W9gYGacnwZlT0e4/Rcho1z9vPnvpi+VnOzEMUi0fPuPrbvIkGMQlvIGArhzm0CEeuYKcx4 n5wB63ndM0lQY7kc2BLP+2EVDi0KVWY= Date: Tue, 4 Jan 2022 21:57:03 +0100 From: Borislav Petkov To: Sean Christopherson Cc: Brijesh Singh , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Vitaly Kuznetsov , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , "Dr . David Alan Gilbert" , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v8 22/40] x86/sev: move MSR-based VMGEXITs for CPUID to helper Message-ID: References: <20211210154332.11526-1-brijesh.singh@amd.com> <20211210154332.11526-23-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 8F516140007 X-Stat-Signature: ti5kt6kkzoofsxt1rhnwhio5myosgd8e Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=alien8.de header.s=dkim header.b=nLvokjXz; dmarc=pass (policy=none) header.from=alien8.de; spf=pass (imf09.hostedemail.com: domain of bp@alien8.de designates 5.9.137.197 as permitted sender) smtp.mailfrom=bp@alien8.de X-Rspamd-Server: rspam11 X-HE-Tag: 1641330306-473055 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Dec 30, 2021 at 06:52:52PM +0000, Sean Christopherson wrote: > Having @subfunc, a.k.a. index, in is weird/confusing/fragile because it's not consumed, > nor is it checked. Peeking ahead, it looks like all future users pass '0'. Taking the > index but dropping it on the floor is asking for future breakage. Either drop it or > assert that it's zero. Yah, just drop it please. It can always be added later if needed. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette