[Qemu-ppc] Freescale qemu kvm and virtio

[Florian Chazal]

Hi guys,

I try to virtualize my system running on freescale p4040 (baremetal) on top of a p4080 + kvm :

Every thing seems to work fine till I do intesive I/O in my VM : 

qemu-system-ppc -enable-kvm -name kvm1 -serial tcp::4444,server,telnet -m 1024 -M ppce500 -nographic -netdev tap,id=tap0,script=no,vhost=on -device  e1000,netdev=tap0 -kernel /home/root/uImage--3.8-r14.3-p4080ds-20131211202743.bin -initrd /home/root/rootfs-goodArch.cpio.gz -append "root=dev/vda1 init=sbin/init console=ttyS0,115200 3" -drive file=/media/sda1/d4-fromscratch-v0.8.4.img,if=virtio
QEMU waiting for connection on: telnet::0.0.0.04444,server
QEMU 1.4.0 monitor - type 'help' for more information
(qemu) status
unknown command: 'status'
(qemu) info status
VM status: running
(qemu) EXT3-fs (sda1): error in ext3_reserve_inode_write: IO failure
EXT3-fs error (device sda1): ext3_new_block: block(1542) >= blocks count(0) - block_group = 0, es == eff1a400
EXT3-fs (sda1): error in ext3_reserve_inode_write: IO failure
EXT3-fs (sda1): error in ext3_orphan_add: IO failure
EXT3-fs (sda1): error in ext3_reserve_inode_write: IO failure
EXT3-fs (sda1): error in ext3_orphan_add: IO failure
EXT3-fs (sda1): error in ext3_reserve_inode_write: IO failure
EXT3-fs error (device sda1): ext3_new_block: block(1545) >= blocks count(0) - block_group = 0, es == eff1a400
EXT3-fs (sda1): error in ext3_reserve_inode_write: IO failure
EXT3-fs (sda1): error in ext3_orphan_add: IO failure

My qcow2 image is on a usb key and after this happens, the usb key file system is remounted by the host in readonly mode due to ext3 journal corruption.

I tried the following thingto use io throttle with virtio bps/iops option => limiting  bps to 500000 everything was slow as expected but then I got a different qemu error

(qemu) Unable to handle kernel paging request for data at address 0xffbc8be4
Faulting instruction address: 0xc048e774

I found people saying that it can be linked to the virtio driver (https://bugzilla.redhat.com/show_bug.cgi?id=531827) and who advice to go for IDE but unfortunately I can't make ide working ("qemu-system-ppc -hda" or -drive ...if=ide), the disk is not seen my the kernel. The freescale documentation only mentions virtio block disk (http://www.freescale.com/infocenter/topic/QORIQSDK/2412421.html#id_2412421).

Is it because freescale implementation for e500mc does not support classic ide ? or I am missing a kernel module (What should be activated to handle qemu ide disk) ?

Any clue or suggestion to move on ?

Thanks

Florian

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Florian Chazal