[Bug 1870331] [NEW] default nic device created even though supplied by configfile

[Ruben]

Public bug reported:

QEMU emulator version 4.1.94

Documentation states that qemu will create a default nic as long as not
explicitly forbidden (-nic none) or defined ( e.g. -nic <options>).

Observation:
Even though qemu-system-ppc is started with "-readconfig" (which defines a 
nic), another nic gets created. When additionally suppling "-nic none", only 
the nic of the config file is created.
As matter of fact, if all items that are defined in config file are supplied as 
command line arguments, no further nic is created. 

Expectation:
When a nic is defined in config file, the default guest-nic should not get 
created.
That would match behavior when all items, defined in config file are supplied 
as command line arguments.


Attached config file.

(qemu) info pci
 Bus 0, device 0, function 0:
 Host bridge: PCI device 1057:0002
 PCI subsystem 1af4:1100
 id ""
 Bus 0, device 1, function 0:
 VGA controller: PCI device 1234:1111
 PCI subsystem 1af4:1100
 BAR0: 32 bit prefetchable memory at 0x80000000 [0x80ffffff].
 BAR2: 32 bit memory at 0x81000000 [0x81000fff].
 BAR6: 32 bit memory at 0xffffffffffffffff [0x0000fffe].
 id ""
 Bus 0, device 2, function 0:
 Ethernet controller: PCI device 10ec:8029
 PCI subsystem 1af4:1100
 IRQ 23.
 BAR0: I/O at 0x1000 [0x10ff].
 BAR6: 32 bit memory at 0xffffffffffffffff [0x0007fffe].
 id ""
 Bus 0, device 3, function 0:
 Ethernet controller: PCI device 10ec:8029
 PCI subsystem 1af4:1100
 IRQ 24.
 BAR0: I/O at 0x1100 [0x11ff].
 BAR6: 32 bit memory at 0xffffffffffffffff [0x0007fffe].
 id ""

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "readconfig file"
   
https://bugs.launchpad.net/bugs/1870331/+attachment/5344765/+files/qemu.config

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1870331

Title:
  default nic device created even though supplied by configfile

Status in QEMU:
  New

Bug description:
  QEMU emulator version 4.1.94

  Documentation states that qemu will create a default nic as long as
  not explicitly forbidden (-nic none) or defined ( e.g. -nic
  <options>).

  Observation:
  Even though qemu-system-ppc is started with "-readconfig" (which defines a 
nic), another nic gets created. When additionally suppling "-nic none", only 
the nic of the config file is created.
  As matter of fact, if all items that are defined in config file are supplied 
as command line arguments, no further nic is created. 

  Expectation:
  When a nic is defined in config file, the default guest-nic should not get 
created.
  That would match behavior when all items, defined in config file are supplied 
as command line arguments.

  
  Attached config file.

  (qemu) info pci
   Bus 0, device 0, function 0:
   Host bridge: PCI device 1057:0002
   PCI subsystem 1af4:1100
   id ""
   Bus 0, device 1, function 0:
   VGA controller: PCI device 1234:1111
   PCI subsystem 1af4:1100
   BAR0: 32 bit prefetchable memory at 0x80000000 [0x80ffffff].
   BAR2: 32 bit memory at 0x81000000 [0x81000fff].
   BAR6: 32 bit memory at 0xffffffffffffffff [0x0000fffe].
   id ""
   Bus 0, device 2, function 0:
   Ethernet controller: PCI device 10ec:8029
   PCI subsystem 1af4:1100
   IRQ 23.
   BAR0: I/O at 0x1000 [0x10ff].
   BAR6: 32 bit memory at 0xffffffffffffffff [0x0007fffe].
   id ""
   Bus 0, device 3, function 0:
   Ethernet controller: PCI device 10ec:8029
   PCI subsystem 1af4:1100
   IRQ 24.
   BAR0: I/O at 0x1100 [0x11ff].
   BAR6: 32 bit memory at 0xffffffffffffffff [0x0007fffe].
   id ""

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1870331/+subscriptions