[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Some questions about virtio-net on Xen x86
Hi all, I tried to run virtio-net on X86 machine according to the Wiki page https://wiki.xenproject.org/wiki/Virtio_On_Xen. And I Encountered some confusing problems. The Qemu version I used is QEMU emulator version 4.2.1 (Debian 1:4.2-3ubuntu6.17) The content of guest.cfg is as below: type = "hvm" name = "g1" memory = 512 vcpus = 2 vif = [ 'model=virtio-net' ] disk = [ 'file:xxx/rootfs.image,xvda1,rw,backendtype=qdisk' ] kernel = "/boot/vmlinuz-5.4.0-80-generic" ramdisk = "/boot/initrd.img-5.4.0-80-generic" root = "/dev/xvda1 ro" extra = 'console=hvc0 xencons=tty' I enter the guest shell. Use ps command to get the running qemu command as below: /usr/local/lib/xen/bin/qemu-system-i386 -xen-domid 31 -no-shutdown -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-31,server=on,wait=off -mon chardev=libxl-cmd,mode=control -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-31,server=on,wait=off -mon chardev=libxenstat-cmd,mode=control -nodefaults -no-user-config -name g1 -vnc 127.0.0.1:0,to=99 -display none -kernel /boot/vmlinuz-5.4.0-80-generic -initrd /boot/initrd.img-5.4.0-80-generic -append root=/dev/xvda1 ro console=hvc0 xencons=tty -device cirrus-vga,vgamem_mb=8 -boot order=cda -smp 2,maxcpus=2 -device virtio-net,id=nic0,netdev=net0,mac=00:16:3e:30:1a:6e -netdev type=tap,id=net0,ifname=vif31.0-emu,br=xenbr0,script=no,downscript=no -machine xenfv,suppress-vmdesc=on -m 504 -drive file=xxx/rootfs.image,if=ide,index=0,media=disk,format=raw,cache=writeback The network-related parameters are " -device virtio-net,id=nic0,netdev=net0,mac=00:16:3e:30:1a:6e -netdev type=tap,id=net0,ifname=vif31.0-emu,br=xenbr0,script=no,downscript=no " Get the interface info as below using command 'ip a'. The mac address of eth0 is 00:16:3e:30:1a:6e, the same as in the qemu command, which made me think virto-net has run successfully. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:16:3e:30:1a:6e brd ff:ff:ff:ff:ff:ff inet 192.168.200.3/24 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::216:3eff:fe30:1a6e/64 scope link valid_lft forever preferred_lft forever I made further check. 1. I run command 'lspci' and got below message. But there is no virtio devices. 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02) 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] 00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03) 00:02.0 Unassigned class [ff80]: XenSource, Inc. Xen Platform Device (rev 01) 00:03.0 VGA compatible controller: Cirrus Logic GD 5446 2. Run "ls /sys/class/net/ -l", what I got is as below: lrwxrwxrwx 1 root root 0 Aug 19 08:15 eth0 -> ../../devices/vif-0/net/eth0 lrwxrwxrwx 1 root root 0 Aug 19 08:15 lo -> ../../devices/virtual/net/lo Run "ls /sys/bus/xen/devices/vif-0/net/ -l", what I got is as below: total 0 drwxr-xr-x 5 root root 0 Aug 19 08:15 eth0 It seems eth0 is not virtio-net, properly a pv-net. I am really confused. I have the following questions: 1. Does Xen x86 still support virtio-net based on QEMU backend? 2. If yes, is there anything wrong in my guest config file? 3. Is my way to check virtio-net in guest is right? It is highly appreciated if you kindly tell me about these. Best wishes Jiamei Xie
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