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Re: [Qemu-devel] kvm: "warning: host doesn't support requested feature:
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From: |
Eduardo Habkost |
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Subject: |
Re: [Qemu-devel] kvm: "warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]" |
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Date: |
Mon, 22 Feb 2016 18:40:28 -0300 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
(CCing libvir-list)
On Sat, Feb 20, 2016 at 04:00:30AM -0500, Paolo Bonzini wrote:
> ----- Original Message -----
> > From: "Jan Kiszka" <address@hidden>
> > To: "Eduardo Habkost" <address@hidden>, "Paolo Bonzini" <address@hidden>
> > Cc: "qemu-devel" <address@hidden>, "kvm" <address@hidden>
> > 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