On Sat, 2010-09-18 at 10:32 -0400, Kevin O'Connor wrote:
> On Fri, Sep 17, 2010 at 11:39:36PM +0200, Conrad Wood wrote:
> > Hi everyone,
> >
> > I'm currently looking into hotplugging CPUs.
> > This exclusively with linux-guests and linux-host.
> > I have found some (conflicting) information about this on the net.
> >
> > As far as I read:
> > * seabios doesn't support SMP (but why does the linux-guest show
> > multiple cpus?)
> > * there is no uniform way of informing the linux kernel that a cpu has
> > added (Found references to a unisys way of doing it though, which seems
> > to be still implemented)
> > * the kernel needs the acpi tables to determine how many cpus it has,
> > thus the support in the bios would involve an aml-compiler to
> > hot-compile new acpi tables.
>
> SeaBIOS version 0.6.1 has ACPI support for cpu-hotplug. It's been
> tested on Linux and Windows. Search the mail archive for "cpu
> hotplug" for the details.
>
> -Kevin
>
hm... after upgrading to seabios 0.6.1 and qemu-kvm 0.13.50 (git today)
I get:
qemu-kvm/hw/qdev.c:94: qdev_create_from_info: Assertion
`bus->allow_hotplug' failed.
when I issue cpu_set 4 online on the cmd line. ;(
starting with commandline:
/usr/local/kvm/bin/qemu-system-x86_64 -M pc \
-bios /usr/local/kvm/seabios/latest \
-cpu phenom -enable-kvm -m 1024 -smp 4,cores=2,maxcpus=30,threads=1
-name testapp -uuid 5ee3d553-f6a4-0f33-6823-ee16a16a7fb4 -nodefaults \
-numa 2 \
-monitor telnet:localhost:9401,server,nowait -rtc base=utc -boot
${BOOTSTRAP} -device
rtl8139,vlan=0,id=net0,mac=52:54:01:65:e6:70,bus=pci.0,addr=0x4 \
-net tap,ifname=cnw0 -chardev pty,id=serial0 -device
isa-serial,chardev=serial0 -k en-gb -vga cirrus \
-drive
file=/srv/kvm/test-app.qcow2,if=virtio,cache=writeback,bus=0,id=a0,index=0,media=disk,format=qcow2,serial=1,boot=on,snapshot=${SNAPSHOT} \
-nodefaults \
-${WD} \
--enable-nesting \
any ideas ?
Conrad
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