From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41613) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Vb6sT-0000fL-Jy for qemu-devel@nongnu.org; Tue, 29 Oct 2013 06:50:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Vb6sS-0004ii-Hs for qemu-devel@nongnu.org; Tue, 29 Oct 2013 06:50:25 -0400 Received: from mx.ipv6.kamp.de ([2a02:248:0:51::16]:47981 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Vb6sS-0004ft-5S for qemu-devel@nongnu.org; Tue, 29 Oct 2013 06:50:24 -0400 Message-ID: <526F92F4.8080406@kamp.de> Date: Tue, 29 Oct 2013 11:50:28 +0100 From: Peter Lieven MIME-Version: 1.0 References: <526F8457.5040907@kamp.de> <526F8701.2030906@redhat.com> <526F89B4.5080504@kamp.de> <526F8BCA.7090503@redhat.com> <526F909A.8000004@kamp.de> <526F927D.1050901@redhat.com> In-Reply-To: <526F927D.1050901@redhat.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Prohibit Windows from running in QEMU List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: "qemu-devel@nongnu.org" On 29.10.2013 11:48, Paolo Bonzini wrote: > Il 29/10/2013 11:40, Peter Lieven ha scritto: >>> The KVM signature should be at CPUID leaf 0x40000100. >> If I enable hyperv for all vServers the signature is at >> KVM_CPUID_SIGNATURE_NEXT (0x40000100) otherwise >> at KVM_CPUID_SIGNATURE (0x0). > KVM_CPU_ID_SIGNATURE is 0x40000000. > >> Does this matter to Linux? > For recent versions it doesn't. Older versions will not be able to use > kvmclock (and other PV enhancements for KVM such as steal time or PV EOI). Ok, so this is not an option today - maybe later... Any other idea to detect Windows is running or trying to start? Thanks, Peter