----- Original Message ----- > From: "Jan Kiszka" <jan.kiszka(a)web.de&gt; > To: "Eduardo Habkost" <ehabkost(a)redhat.com&gt;, "Paolo Bonzini" <pbonzini(a)redhat.com&gt; > Cc: "qemu-devel" <qemu-devel(a)nongnu.org&gt;, "kvm" <kvm(a)vger.kernel.org&gt; > 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.