From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40887) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aX3P3-0008Fg-KT for qemu-devel@nongnu.org; Sat, 20 Feb 2016 04:00:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aX3P0-000340-EU for qemu-devel@nongnu.org; Sat, 20 Feb 2016 04:00:37 -0500 Received: from mx6-phx2.redhat.com ([209.132.183.39]:39113) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aX3P0-00033m-7U for qemu-devel@nongnu.org; Sat, 20 Feb 2016 04:00:34 -0500 Date: Sat, 20 Feb 2016 04:00:30 -0500 (EST) From: Paolo Bonzini Message-ID: <859622929.26459953.1455958830109.JavaMail.zimbra@redhat.com> In-Reply-To: <56C81F3C.4010006@web.de> References: <56C81F3C.4010006@web.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] kvm: "warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]" List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: Eduardo Habkost , kvm , qemu-devel ----- Original Message ----- > From: "Jan Kiszka" > To: "Eduardo Habkost" , "Paolo Bonzini" > Cc: "qemu-devel" , "kvm" > Sent: Saturday, February 20, 2016 9:09:32 AM > Subject: kvm: "warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]" > > Hi all, > > I suppose 5120901a37 introduced this: qemu with kernel_irqchip=off now > generates these warnings, one per VCPU, during QEMU startup. Is the plan > to live with them until we finally have x2APIC emulation in userspace > (ie. also MSR vmexiting to there), or should we otherwise avoid it? I think it's a bug, x2apic should be auto-suppressed with kernel_irqchip=off. Paolo