(CCing libvir-list) On Sat, Feb 20, 2016 at 04:00:30AM -0500, Paolo Bonzini wrote:

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From: "Jan Kiszka" <jan.kiszka@web.de> To: "Eduardo Habkost" <ehabkost@redhat.com>, "Paolo Bonzini" <pbonzini@redhat.com> Cc: "qemu-devel" <qemu-devel@nongnu.org>, "kvm" <kvm@vger.kernel.org> 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.

My first reaction is to dislike the idea of adding yet another variable that affects the results of CPU models. But considering that we are moving towards a design where libvirt must not assume or query any low-level detail from CPU models at all, maybe this won't be harmful. -- Eduardo