Re: [Qemu-devel] [PATCH 7/8] pseries: savevm support for PAPR virtual SCSI

[Paolo Bonzini]

Il 03/06/2013 07:46, Alexey Kardashevskiy ha scritto:
> Ok. I implemented {save|load}_request for IBMVSCSI, started testing - the
> destination system behaves very unstable, sometime it is a fault in
> _raw_spin_lock or it looks okay but any attempt to read the filesystem
> leads to 100% cpu load in qemu process and no response from the guest.
> 
> I tried virtio-scsi as well (as it was referred as a good example), it
> fails in exactly the same way. So I started wondering - when did you try it
> last time? :)

Perhaps a year ago.  Gerd must have tested usb-storage later than that
though.

> My test is:
> 1. create qcow2 image 8GB, put it to 2GB USB disk.
> 2. put 1.8GB "dummy" image onto the same USB disk.
> 3. run qemu with qcow2 image.
> 4. do "mkfs.ext4 /dev/sda" in the guest. It creates 300MB file when there
> is enough space.
> 5. wait till the source qemu gets stopped due to io error (info status
> confirms this).
> 6. migrate.
> 7. remove "dummy".
> 8. "c"ontinue in the destination guest.

Sounds good.  We really need testcases for this.  I'll take a look when
I come back from vacation.

Paolo