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Date: Tue, 9 Nov 2010 08:55:01 +0200
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] smp: linux guest only sees 1 CPU when not using KVM
Message-ID: <20101109065501.GD9036@redhat.com>
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To: qemu-devel@nongnu.org

On Mon, Nov 08, 2010 at 11:30:52PM +0100, Llu=C3=ADs wrote:
> Lennart Sorensen writes:
>=20
> > On Mon, Nov 08, 2010 at 10:57:19PM +0100, Llu=C3=ADs wrote:
> >> Well, thre's nothing more to add than the contents in the subject.
> >>=20
> >> I tried booting up with -smp 2, and /proc/cpuinfo on the linux guest
> >> only return one CPU, while booting with "-smp 2 -enable-kvm" shows 2
> >> CPUs.
>=20
> > I was under the impression qemu didn't emulate SMP.  KVM on the other
> > hand does support running on real SMP hardware.  It doesn't have to
> > emulate SMP after all.
>=20
> Well, I thought it did when I saw the "-smp" option, and it does in fact
> create multiple CPUState objects, as if the "extra" cpus where
> unplugged.
>=20
> In fact, cpus.c:cpu_exec_all does indeed loop through all the CPUState
> objects, calling qemu_cpu_exec on each.
>=20
Yes. Qemu should emulate smp fine. What "info cpus" in monitor shows?
Anything interesting in dmesg?

--
			Gleb.