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Re: [Qemu-devel] [Qemu-ppc] [PATCHv2 0/8] spapr: DRC cleanups (part VI)
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCHv2 0/8] spapr: DRC cleanups (part VI) |
Date: |
Sat, 15 Jul 2017 12:42:46 +1000 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Fri, Jul 14, 2017 at 10:50:06AM -0300, Daniel Henrique Barboza wrote:
>
>
> On 07/14/2017 03:53 AM, David Gibson wrote:
> > On Thu, Jul 13, 2017 at 07:13:23AM -0300, Daniel Henrique Barboza wrote:
> > >
> > > On 07/12/2017 09:57 PM, David Gibson wrote:
> > > > On Wed, Jul 12, 2017 at 10:48:38AM -0300, Daniel Henrique Barboza wrote:
> > > > > The dreaded Libvirt hotplug-migrate-hotunplug scenario is working
> > > > > nicely.
> > > > Good to hear.
> > > >
> > > > > device_add when the machine is in RUN_STATE_PRELAUNCH (-S) still
> > > > > doesn't
> > > > > work but it is expected - as discussed in "[RFC drcVI PATCH] spapr:
> > > > > reset
> > > > > DRCs
> > > > > on migration pre_load​", this scenario can't be fixed solely by this
> > > > > DRC
> > > > > cleanup.
> > > > Hmm.. what's the exact test case you're using here? The prelaunch
> > > > case I tried _did_ work (queueing the event during prelaunch, then
> > > > completing the hotplug sequence once the guest had booted).
> > > This is the test case:
> > >
> > > sudo ./qemu-system-ppc64 -name migrate_qemu -boot strict=on --enable-kvm
> > > -device nec-usb-xhci,id=usb,bus=pci.0,addr=0xf -device
> > > spapr-vscsi,id=scsi0,reg=0x2000 -smp
> > > 1,maxcpus=4,sockets=4,cores=1,threads=1
> > > --machine pseries,accel=kvm,usb=off,dump-guest-core=off -m
> > > 4G,slots=32,maxmem=32G -drive
> > > file=/home/danielhb/vm_imgs/ubuntu1704.qcow2,format=qcow2,if=none,id=drive-virtio-disk0,cache=none
> > > -device
> > > virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
> > > -nographic -S
> > > QEMU 2.9.50 monitor - type 'help' for more information
> > > (qemu)
> > > (qemu) device_add host-spapr-cpu-core,id=core1,core-id=1
> > > (qemu) cont
> > >
> > > (...)
> > >
> > > After OS boots:
> > >
> > > address@hidden:~$ lscpu
> > > Architecture: ppc64le
> > > Byte Order: Little Endian
> > > CPU(s): 1
> > > On-line CPU(s) list: 0
> > > Thread(s) per core: 1
> > > Core(s) per socket: 1
> > > Socket(s): 1
> > > NUMA node(s): 1
> > > Model: 2.1 (pvr 004b 0201)
> > > Model name: POWER8E (raw), altivec supported
> > > Hypervisor vendor: horizontal
> > > Virtualization type: full
> > > L1d cache: 64K
> > > L1i cache: 32K
> > > NUMA node0 CPU(s): 0
> > > address@hidden:~$ (qemu)
> > > (qemu) info cpus
> > > * CPU #0: nip=0xc0000000000a3e0c thread_id=6134
> > > CPU #1: nip=0x0000000000000000 (halted) thread_id=6163
> > > (qemu) info hotpluggable-cpus
> > > Hotpluggable CPUs:
> > > type: "host-spapr-cpu-core"
> > > vcpus_count: "1"
> > > CPUInstance Properties:
> > > core-id: "3"
> > > type: "host-spapr-cpu-core"
> > > vcpus_count: "1"
> > > CPUInstance Properties:
> > > core-id: "2"
> > > type: "host-spapr-cpu-core"
> > > vcpus_count: "1"
> > > qom_path: "/machine/peripheral/core1"
> > > CPUInstance Properties:
> > > core-id: "1"
> > > type: "host-spapr-cpu-core"
> > > vcpus_count: "1"
> > > qom_path: "/machine/unattached/device[0]"
> > > CPUInstance Properties:
> > > core-id: "0"
> > > (qemu)
> > Huh. I tried basically the same thing, and I get the second cpu once
> > the OS is booted. My first guess would be that the difference is in
> > the guest (mine is RHEL 7.3). Have you double checked that rtas_errd
> > and drmgr are present in your guest?
>
> Yeah the guest has drmgr and rtas_errd running. As you said, there might be
> something different in the guests that explains why yours work and mine
> doesn't.
> Coupling that with the fact that this is not a common usage, I believe we
> can leave it as a FYI/reminder if we need to revisit this issue in the
> future.
I concur.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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- Re: [Qemu-devel] [Qemu-ppc] [PATCHv2 7/8] spapr: Remove sPAPRConfigureConnectorState sub-structure, (continued)
Re: [Qemu-devel] [PATCHv2 0/8] spapr: DRC cleanups (part VI), David Gibson, 2017/07/12