[Qemu-devel] nic is lost, in the virtual machine running

[Qemu-devel] nic is lost, in the virtual machine running

[melolinux]

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Hi all：

Problem description.

1. /usr/bin/qemu-system-x86_64 -machine accel=kvm -name a58970a2-10aa-4973-9261-7384b2f53221 -S -machine pc-0.14,accel=kvm,usb=off -m 4096 -smp 4,sockets=1,cores=4,threads=1 -uuid f3a2217f-ae5c-461b-a922-d37a3a98edc6 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/a58970a2-10aa-4973-9261-7384b2f53221.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/dev/493bdd93-6eb4-4499-a344-99cd0abef251/95eb250a-05ab-4da1-8673-8a616b4d0a6e,if=none,id=drive-ide0-0-0,format=qcow2,cache=writeback -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive file=/dev/493bdd93-6eb4-4499-a344-99cd0abef251/27d2df8a-dc00-4f6a-8669-f5dffc7a92d8,if=none,id=drive-ide0-0-1,format=qcow2,cache=writeback -device ide-hd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev tap,ifname=tapa589700,script=no,id=hostnet0 -device e1000,netdev=hostnet0,id=net0,mac=c6:b0:5c:de:54:39,bus=pci.0,addr=0x3 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -device usb-tablet,id=input0 -spice port=5900,addr=10.9.40.213,disable-ticketing,seamless-migration=on -vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=9437184 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6


2. Problem found :the client can't find the network device (It takes a long time since we create the vm)

3. we use "qemu-monitor-commond --hmp xx info pci" to check it and find that we lost the ethernet controller.

4. we reboot it and it is back to normal


It is a pity that we can not found the retrieval methods.  It happened twice in one month.
What causes this problem ? Is there any connecton between "spice" and this problem?

Looking forward to your reply.


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Re: [Qemu-devel] nic is lost, in the virtual machine running

[Stefan Hajnoczi]

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On Sat, Jul 19, 2014 at 03:31:00PM +0800, melolinux wrote:
> 1. /usr/bin/qemu-system-x86_64 -machine accel=kvm -name a58970a2-10aa-4973-9261-7384b2f53221 -S -machine pc-0.14,accel=kvm,usb=off -m 4096 -smp 4,sockets=1,cores=4,threads=1 -uuid f3a2217f-ae5c-461b-a922-d37a3a98edc6 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/a58970a2-10aa-4973-9261-7384b2f53221.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/dev/493bdd93-6eb4-4499-a344-99cd0abef251/95eb250a-05ab-4da1-8673-8a616b4d0a6e,if=none,id=drive-ide0-0-0,format=qcow2,cache=writeback -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive file=/dev/493bdd93-6eb4-4499-a344-99cd0abef251/27d2df8a-dc00-4f6a-8669-f5dffc7a92d8,if=none,id=drive-ide0-0-1,format=qcow2,cache=writeback -device ide-hd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev tap,ifname=tapa589700,script=no,id=hostnet0 -device e1000,netdev=hostnet0,id=net0,mac=c6:b0:5c:de:54:39,bus=pci.0,addr=0x3 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -device usb-tablet,id=input0 -spice port=5900,addr=10.9.40.213,disable-ticketing,seamless-migration=on -vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=9437184 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6
> 
> 
> 2. Problem found :the client can't find the network device (It takes a long time since we create the vm)
> 
> 3. we use "qemu-monitor-commond --hmp xx info pci" to check it and find that we lost the ethernet controller.

There is not enough information in #2 and #3 to say what is going on.

What does lspci report inside the guest?

Does rmmod and modprobe of the NIC driver inside the guest bring the
interface back?

Did you check that QEMU's "info pci" reports the NIC when the guest has
booted but doesn't report it when the network becomes unavailable?  If
yes, then please check the libvirt log for hot unplug events
(/var/log/libvirt).

Stefan

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