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Re: [Qemu-devel] smp: linux guest only sees 1 CPU when not using KVM
From: |
Lluís |
Subject: |
Re: [Qemu-devel] smp: linux guest only sees 1 CPU when not using KVM |
Date: |
Mon, 08 Nov 2010 23:30:52 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
Lennart Sorensen writes:
> On Mon, Nov 08, 2010 at 10:57:19PM +0100, Lluís wrote:
>> Well, thre's nothing more to add than the contents in the subject.
>>
>> 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.
> 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.
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.
In fact, cpus.c:cpu_exec_all does indeed loop through all the CPUState
objects, calling qemu_cpu_exec on each.
Lluis
--
"And it's much the same thing with knowledge, for whenever you learn
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