From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: kvm: "warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]" Date: Sat, 20 Feb 2016 04:00:30 -0500 (EST) Message-ID: <859622929.26459953.1455958830109.JavaMail.zimbra@redhat.com> References: <56C81F3C.4010006@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: Eduardo Habkost , qemu-devel , kvm To: Jan Kiszka Return-path: Received: from mx6-phx2.redhat.com ([209.132.183.39]:60773 "EHLO mx6-phx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992561AbcBTJAe (ORCPT ); Sat, 20 Feb 2016 04:00:34 -0500 In-Reply-To: <56C81F3C.4010006@web.de> Sender: kvm-owner@vger.kernel.org List-ID: ----- 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