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

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

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.
>