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Re: [Qemu-devel] [RFC qom-cpu v4 09/10] piix4: implement function cpu_st
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From: |
Chen Fan |
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Subject: |
Re: [Qemu-devel] [RFC qom-cpu v4 09/10] piix4: implement function cpu_status_write() for vcpu ejection |
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Date: |
Wed, 27 Nov 2013 20:11:33 +0800 |
On Mon, 2013-11-25 at 19:38 +0100, Vasilis Liaskovitis wrote:
> On Fri, Nov 22, 2013 at 09:02:27AM +0100, Vasilis Liaskovitis wrote:
> > Hi,
> >
> > On Wed, Oct 09, 2013 at 05:43:17PM +0800, Chen Fan wrote:
> > > When OS eject a vcpu (like: echo 1 >
> > > /sys/bus/acpi/devices/LNXCPUXX/eject),
> > > it will call acpi EJ0 method, the firmware will write the new cpumap, QEMU
> > > will know which vcpu need to be ejected.
> >
> > I think that the _EJ0 callback (CPEJ method in
> > hw/i386/acpi-dsdt-cpu-hotplug.dsl)
> > currently does not write the new cpumap, it only sleeps. So cpu_state_write
> > is
> > never called on ejection, and the cpu objects remain allocated in qemu. Is
> > there
> > an updated version of the patchseries with a CPEJ that writes the new
> > cpumap?
>
> oops, never mind. I missed your seabios patch mentioned in the head message,
> got it now.
>
Ok, thanks for your attention.
> thanks,
>
> - Vasilis