Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764413AbcJaJxS (ORCPT ); Mon, 31 Oct 2016 05:53:18 -0400 Received: from mail.skyhub.de ([78.46.96.112]:53483 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1764251AbcJaJxQ (ORCPT ); Mon, 31 Oct 2016 05:53:16 -0400 Date: Mon, 31 Oct 2016 10:53:12 +0100 From: Borislav Petkov To: "Luc, Piotr" Cc: "pbonzini@redhat.com" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "he.chen@linux.intel.com" , "tglx@linutronix.de" , "x86@kernel.org" , "hpa@zytor.com" , "mingo@redhat.com" , "Kang, Luwei" , "rkrcmar@redhat.com" Subject: Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest Message-ID: <20161031095312.dzv3rj2fqgjjsy7w@pd.tnic> References: <1477645960-6898-1-git-send-email-he.chen@linux.intel.com> <1477649272.17668.7.camel@intel.com> <5c00fdf0-a5a4-7a78-4ed8-8ae3ef710a68@redhat.com> <20161028110834.svzzs5hftg3bybiz@pd.tnic> <20161028122123.24i3synevehn6r3p@pd.tnic> <425702906.9319122.1477743677017.JavaMail.zimbra@redhat.com> <1477905033.32008.5.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1477905033.32008.5.camel@intel.com> User-Agent: NeoMutt/20161014 (1.7.1) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 480 Lines: 14 On Mon, Oct 31, 2016 at 09:15:43AM +0000, Luc, Piotr wrote: > I think that in v4.9-rc2 the CPUID[7,0].edx bits can be masked out by > applying noxsave to cmdline. Using directly cpu_count will result in > passing the bits in edx to a guest directly while the xsaveopt and rest > of AVX512 features bits will be cleared.  Errr, I can't parse that reading it backwards and forwards. Please elaborate. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply.