Hi Vikram, Oleksii
I follow the slide virtio for Xen on ARM[1], but I met some issues, and
stuck for about two days.
I use upstream lastest qemu repo master branch, not qemu-xen.git
repo.
My start command as below[2], but seems I need first `xl create domu.cfg`,
otherwise it will fail, because xen hypervisor
dm_op->rcu_lock_remote_domain_by_id will return failure if domu
not created. My domu cfg is simple:
kernel = "/run/media/boot-mmcblk1p1/Image"
disk = [ '/etc/xen/disk_1.img,,xvda,specification=virtio' ]
cmdline = "console=hvc0 root=/dev/xvda rw"
name = "DomU"
memory = 512
serial = "pty"
I drop qdisk in the disk entry, because xen tool report qdisk and virtio
not compatible.
And the arg xen_domid should be same as domu domain id? Is
there any dynamic way to set xen_domid, start qemu when start
domu?
Does the domu dts still needed to include the virtio,mmio node?
however xl create domu.cfg relies virtio disk ready, which needs qemu
start first. This confuses me. How do you address this
or I do something wrong?
Then after xl create, I quickly start qemu, but met:
failed to create ioreq server, then I see there is mismatch.
qemu use HVM_IOREQSRV_BUFIOREQ_ATOMIC to create ioreq server,
but xen ioreq_server_create will return failure:
if ( !IS_ENABLED(CONFIG_X86) && bufioreq_handling )
return -EINVAL;
So I change HVM_IOREQSRV_BUFIOREQ_OFF in qemu, but met:
qemu-system-aarch64: failed to map ioreq server resources: error 2
handle=0xaaaad26c7f30
qemu-system-aarch64: xen hardware virtual machine initialisation failed
Do you have out of box repo that works well? Including Qemu and Xen,
I am trying virtio disk, but will move to test virtio gpu soon.
I am not sure there are some downstream patches in your side to
address and make it work well.
Thanks for your help.
Thanks,
Peng.
[1]https://www.youtube.com/watch?v=boRQ8UHc760
[2]qemu-system-aarch64 -xen-domid 1 \
-chardev socket,id=libxl-cmd,path=qmp-libxl-1,server=on,wait=off \
-mon chardev=libxl-cmd,mode=control \
-chardev socket,id=libxenstat-cmd,path=qmp-libxenstat-1,server=on,wait=off \
-mon chardev=libxenstat-cmd,mode=control \
-xen-attach -name guest0 -vnc none -display none -nographic \
-machine xenpvh -m 513 &
