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Re: [Qemu-devel] ppc64 not resuming with v2.3.0-rc3


From: Stefan Berger
Subject: Re: [Qemu-devel] ppc64 not resuming with v2.3.0-rc3
Date: Thu, 16 Apr 2015 17:24:54 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 04/16/2015 04:53 PM, Mark Cave-Ayland wrote:
On 16/04/15 20:49, Stefan Berger wrote:
Hmmmm the fix is correct in that internal MSR variables need to be
updated post-restore (as noted in the message above it was the exception
prefix variables that weren't updated by having MSR_EP set).

Maybe on ppc64 there is another bit similar to MSR_TGPR that needs to be
excluded? Alex, any thoughts?
I want to add that I am running QEMU for ppc64 in emulation mode on a
x86_64 host. The suspend/resume problem, while in SLOF, did not exist in
QEMU v2.2, so I anticipate that this is a regression would also be
visible on QEMU on kvm, though a simple test on such a machine may show
different...

Removing the patch solves the problem while in SLOF. Once booting into
Linux suspend/resume does not work - with qemu-system-ppc64 on x86_64
host. Timestamps shown by Linux actually make a jump backwards and
ultimately Linux hangs.
Just to clarify the terminology here, when you say suspend/resume are
you talking about a hardware suspend/resume or issuing a savevm/loadvm
sequence in the QEMU monitor? Are you able to provide further detail to
reproduce your test case?

I am using 'virsh save' to suspend the VM, 'virsh restore' to resume it, so I am doing this on libvirt level.

This is the XML to just test suspend / resume while it is in SLOF. No disk needed.

<domain type='qemu'>
  <name>ppc-test</name>
  <uuid>3e17dcdb-4a22-49ed-b8f9-4df523d04bb3</uuid>
  <memory unit='KiB'>1310720</memory>
  <currentMemory unit='KiB'>1310720</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='ppc64' machine='pseries-2.2'>hvm</type>
    <boot dev='hd'/>
    <boot dev='cdrom'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-ppc64</emulator>
    <controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <input type='keyboard' bus='usb'/>
    <input type='mouse' bus='usb'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='vga' vram='16384' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </video>
    <memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='selinux' relabel='yes'/>
</domain>


    Stefan



ATB,

Mark.





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