[Qemu-devel] [Bug 588731] Re: PXE boot not working

[Michal Suchanek]

There seems to be an issue with kvm virtual network interface being
connected to a in-kernel bridge implementation.

When you configure networking that way the bridge port comes up when the
kvm instance is started.

As the time from the kvm start to entering the netboot rom is minimal
and the timeout before the bridge starts forwarding on new ports is long
this may cause the machine never getting an address.

If you are using a bridge try setting the forwarding delay to a small
value like:

iface vmbridge inet static
 bridge_ports <probably should put some network interface name here - 
undocumented>
 address 10.10.10.1
 netmask 255.255.255.0
 post-up brctl setfd vmbridge 3

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https://bugs.launchpad.net/bugs/588731

Title:
  PXE boot not working

Status in QEMU:
  Incomplete

Bug description:
  /root/qemu-test/qemu-kvm/x86_64-softmmu/qemu-system-x86_64 -net
  tap,vlan=0,name=tap.0 -boot n -net
  nic,macaddr=$MAC,vlan=0,model=e1000,name=e1000.0 -chardev
  socket,id=monitor,host=0.0.0.0,port=$MONITORPORT,telnet,server,nowait
  -monitor chardev:monitor


  net0: 02:5a:3b:27:00:a1 on PCI00:03.0 (open)                                  
                                                             
   [Link:up, TX:0 TXE:0 RX:0 RXE:0]                                             
                                                            
   DHCP (net0 02:5a:3b:27:00:a1)................ Connection timed out 
(0x4c106035)                                                            
   No more network devices                                                      
                                                              
                                                                                
                                                                                
                                       
  No bootable device. 


  After doing a system_reset ....

  net0: 02:5a:3b:27:00:a1 on PCI00:03.0 (open)                                  
                                                             
   [Link:up, TX:0 TXE:0 RX:0 RXE:0]                                             
                                                            
  DHCP (net0 02:5a:3b:27:00:a1).... ok                                          
                                                             
  net0: 10.201.1.161/255.0.0.0 gw 10.0.0.1                                      
                                                             
  Booting from filename "boot.pxe"                                              
                                                            
  tftp://x.x.x./boot.pxe.. ok      

  
  And it magaically works.

  using HEAD.

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