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

[Paolo Bonzini <pbonzini@redhat.com>]

On 16/04/2015 23:24, Stefan Berger wrote:
> 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.

Ok, that's the equivalent of "migrate exec:cat>foo.save" and "-incoming
'exec:cat<foo.save'"

Paolo

> 
> 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.
>>
> 
> 
>