Re: Virtio On XEN/ARM

[Haiwei Li <mrhaiwei.li@xxxxxxxxx>]

CC: Vikram Garhwal <fnu.vikram@xxxxxxxxxx>, the new email address.

Haiwei Li <mrhaiwei.li@xxxxxxxxx> 于2025年5月22日周四 17:58写道：
>
> Hi Vikram and all,
>
> I'm trying to enable a virtio device(such as virtio-net) with qemu
> backend on arm platform but failed.
>
> I've tried the following configurations(The details are from `VirtIO
> for Xen on ARM - Vikram Garhwal, AMD`):
>
> QEMU build: ./configure --target-list=aarch64-softmmu --enable-xen; make -j8
>
> XEN build: build xen with configurations(CONFIG_IOREQ_SERVER=y and
> CONFIG_EXPERT=y)
>
> Linux(Dom0&DomU) build: build with (CONFIG_XEN_VIRTIO=y,
> CONFIG_XEN_DOM0=y, etc.) and (CONFIG_VIRTIO_NET=y, etc.)
>
> Setup bridge in DOM0: brctl addr xenbr0
>
> The vm configuration like:
>
> ```
> name = "domu01"
> memory = 4096
> vcpus = 4
> vif = [ 'model=virtio-net,type=ioemu' ]
> kernel = '/home/haiwei/workspace/vmlinuz-6.1.43xen'
> ramdisk = '/home/haiwei/workspace/initrd.img-6.1.43xen'
> extra = 'console=tty1 root=/dev/xvda1p1 rootfstype=ext4 rootwait rw
> console=ttyS2,1500000 earlycon=xen,0xfeb50000,1500000 loglevel=8
> console=hvc0'
> disk = [ '/home/haiwei/workspace/ubuntu22.04.raw,raw,xvda1,rw' ]
> ```
>
> The steps I have tried:
>
> 1. Start qemu first
>
> ```
> qemu-system-aarch64 -xen-domid 1 -no-shutdown        \
> -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=/var/run/xen/qmp-libxenstat-3,server=on,wait=off
> \
> -mon chardev=libxenstat-cmd,mode=control \
> -nodefaults                                     \
> -no-user-config                                 \
> -xen-attach -name domu01                            \
> -vnc none                                       \
> -display none                                   \
> -nographic                                      \
> -device virtio-net-device,id=nic0,netdev=net0,mac=00:16:3e:5c:81:78 \
> -netdev type=tap,id=net0,ifname=vif1.0-emu,br=xenbr0,script=no,downscript=no \
> -machine xenpvh \
> -m 4096
> ```
>
> I got the print like:
>
> ```
> qemu-system-aarch64: warning: xen: failed to create ioreq server
> qemu-system-aarch64: warning: tpm-base-addr is not provided. TPM will
> not be enabled
> qemu-system-aarch64: xendevicemodel_set_irq_level failed
> ```
>
> 2. Then start xl
>
> ```
> xl -v create -c ./my.vm (I have changed the 'minmsglevel_default' to
> 'XTL_DEBUG')
> ```
>
> But error like:
>
> ```
> libxl: debug: libxl_create.c:2248:do_domain_create: ao 0x5591b3c8a0:
> create: how=(nil) callback=(nil) poller=0x5591b36740
> libxl: detail: libxl_create.c:738:libxl__domain_make: passthrough: disabled
> libxl: detail: libxl_create.c:747:libxl__domain_make: altp2m: disabled
> libxl: debug: libxl_arm.c:182:libxl__arch_domain_prepare_config:
> Configure the domain
> libxl: debug: libxl_arm.c:185:libxl__arch_domain_prepare_config:  -
> Allocate 0 SPIs
> libxl: debug: libxl_device.c:443:libxl__device_disk_set_backend: Disk
> vdev=xvda1 spec.backend=unknown specification=xen
> libxl: debug: libxl_device.c:483:libxl__device_disk_set_backend: Disk
> vdev=xvda1, using backend phy
> libxl: error: libxl_nic.c:107:libxl__device_nic_setdefault: Domain
> 2:trying to create PV or PVH guest with an emulated interface
> libxl: error: libxl_nic.c:529:libxl__device_nic_set_devids: Domain
> 2:Unable to set nic defaults for nic 0
> libxl: debug: libxl_event.c:863:libxl__ev_xswatch_deregister: watch
> w=0x5591b39f60: deregister unregistered
> libxl: debug: libxl_domain.c:1597:devices_destroy_cb: Domain 2:Forked
> pid 2038 for destroy of domain
> libxl: debug: libxl_create.c:2289:do_domain_create: ao 0x5591b3c8a0:
> inprogress: poller=0x5591b36740, flags=i
> libxl: debug: libxl_event.c:2067:libxl__ao_complete: ao 0x5591b3c8a0:
> complete, rc=-3
> libxl: debug: libxl_event.c:2036:libxl__ao__destroy: ao 0x5591b3c8a0: destroy
> libxl: debug: libxl_domain.c:1042:libxl_domain_destroy: Domain 2:ao
> 0x5591b3ef90: create: how=(nil) callback=(nil) poller=0x5591b36740
> libxl: error: libxl_domain.c:354:libxl_domain_info: Domain 2:Getting
> domain info: No such process
> libxl: error: libxl_domain.c:1179:libxl__destroy_domid: Domain
> 2:Non-existant domain
> libxl: error: libxl_domain.c:1133:domain_destroy_callback: Domain
> 2:Unable to destroy guest
> libxl: error: libxl_domain.c:1060:domain_destroy_cb: Domain
> 2:Destruction of domain failed
> libxl: debug: libxl_event.c:2067:libxl__ao_complete: ao 0x5591b3ef90:
> complete, rc=-21
> libxl: debug: libxl_domain.c:1051:libxl_domain_destroy: Domain 2:ao
> 0x5591b3ef90: inprogress: poller=0x5591b36740, flags=ic
> libxl: debug: libxl_event.c:2036:libxl__ao__destroy: ao 0x5591b3ef90: destroy
> xencall:buffer: debug: total allocations:45 total releases:45
> xencall:buffer: debug: current allocations:0 maximum allocations:2
> xencall:buffer: debug: cache current size:1
> xencall:buffer: debug: cache hits:37 misses:1 toobig:7
> xencall:buffer: debug: total allocations:0 total releases:0
> xencall:buffer: debug: current allocations:0 maximum allocations:0
> xencall:buffer: debug: cache current size:0
> xencall:buffer: debug: cache hits:0 misses:0 toobig:0
> ```
>
> Could you please, are there any configuration errors? And what can I
> do to enable the virtio device in DomU? Thanks in advance!
>
> Best regards,
>   Haiwei