From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: [PATCH -v2] kvm: Emulate MOVBE Date: Sun, 14 Apr 2013 21:09:55 +0200 Message-ID: <20130414190954.GE20547@pd.tnic> References: <20130410112942.07dfc167@slackpad> <20130410100845.GB17919@redhat.com> <20130410123901.46b65169@slackpad> <20130410121639.GE17919@redhat.com> <20130411001815.GA17544@pd.tnic> <20130411142818.GA17919@redhat.com> <20130411153733.GE27062@pd.tnic> <20130414074107.GD17919@redhat.com> <20130414173215.GD20547@pd.tnic> <4bbedfc0-67cb-48de-bfb5-2e0b0c42a9f6@email.android.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: Gleb Natapov , Andre Przywara , kvm@vger.kernel.org, =?utf-8?B?SsO2cmcgUsO2ZGVs?= , x86-ml To: "H. Peter Anvin" Return-path: Received: from mail.skyhub.de ([78.46.96.112]:35598 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753364Ab3DNTKF (ORCPT ); Sun, 14 Apr 2013 15:10:05 -0400 Content-Disposition: inline In-Reply-To: <4bbedfc0-67cb-48de-bfb5-2e0b0c42a9f6@email.android.com> Sender: kvm-owner@vger.kernel.org List-ID: On Sun, Apr 14, 2013 at 11:36:29AM -0700, H. Peter Anvin wrote: > Just to interject here... all this is about host kernel vs userspace, > correct? I.e. nothing that affects the guest. I assume that the guest > sees CPUID and that is what is supported. Actually, currently the guest sees MOVBE in CPUID set: max base function: 0x00000005 CPUID.EAX=0x00000000 EAX=0x00000005, EBX=0x68747541, ECX=0x444d4163, EDX=0x69746e65 CPUID.EAX=0x00000001 EAX=0x000106c2, EBX=0x01000800, ECX=0x80400201, EDX=0x0789fbff ^ |- bit 22 even though host (AMD) doesn't support it. And I'd say we want it that way because the guest should show it in CPUID so that not only the guest kernel but also guest userspace binaries built with MOVBE can be run. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --