[Qemu-devel] problem bringing up QEMU test

[Kyle Hayes]

I'm doing something wrong somewhere.  I am using Gentoo on x86 as the host.  
I've loaded the precompiled QEMU binary 0.5.2.

I have the TUN/TAP device set up on the host:

bash-2.05b# ifconfig tap0
tap0      Link encap:Ethernet  HWaddr FE:FD:00:00:00:00
          inet addr:172.20.0.1  Bcast:172.20.255.255  Mask:255.255.0.0
          inet6 addr: fe80::fcfd:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:55 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:5416 (5.2 Kb)

I set up a direct host route to the other end:

bash-2.05b# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.20.0.2      0.0.0.0         255.255.255.255 UH    0      0        0 tap0
10.0.0.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
172.20.0.0      0.0.0.0         255.255.0.0     U     0      0        0 tap0
127.0.0.0       127.0.0.1       255.0.0.0       UG    0      0        0 lo
0.0.0.0         10.0.0.1        0.0.0.0         UG    0      0        0 eth0


I'm running QEMU as root (not particularly safe, but I want to see if I can 
get it to work before I break things with permissions).  The test image boots 
and runs, but the network doesn't work:

bash-2.05b# ./qemu.sh
Connected to host network interface: tun0
Load kernel at 0xac100000 (0x00100000)
Linux version 2.4.21 (address@hidden) (gcc version 3.2.2 20030222 
(Red Hat Linux 3.2.2-5)) #5 Tue Nov 11 18:18:53 CET 2003
BIOS-provided physical RAM map:
 BIOS-e801: 0000000000000000 - 000000000009f000 (usable)
 BIOS-e801: 0000000000100000 - 0000000002000000 (usable)
32MB LOWMEM available.
On node 0 totalpages: 8192
zone(0): 4096 pages.
zone(1): 4096 pages.
zone(2): 0 pages.
Kernel command line: console=ttyS0 root=/dev/hda sb=0x220,5,1,5 ide2=noprobe 
ide3=noprobe ide4=noprobe ide5=noprobe
ide_setup: ide2=noprobe
ide_setup: ide3=noprobe
ide_setup: ide4=noprobe
ide_setup: ide5=noprobe
Initializing CPU#0
Detected 2592.439 MHz processor.
Calibrating delay loop... 5164.23 BogoMIPS
Memory: 28880k/32768k available (1210k kernel code, 3500k reserved, 266k data, 
64k init, 0k highmem)
Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
CPU: L1 I cache: 8K<6>CPU: L2 cache: 128K
CPU: Intel Pentium Pro stepping 03
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
apm: BIOS not found.
Starting kswapd
Journalled Block Device driver loaded
Detected PS/2 Mouse Port.
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with no serial options enabled
ttyS00 at 0x03f8 (irq = 4) is a 16450
ne.c:v1.10 9/23/94 Donald Becker (address@hidden)
Last modified Nov 1, 2000 by Paul Gortmaker
NE*000 ethercard probe at 0x300: 52 54 00 12 34 56
eth0: NE2000 found at 0x300, using IRQ 9.
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
hda: QEMU HARDDISK, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: attached ide-disk driver.
hda: 20480 sectors (10 MB) w/256KiB Cache, CHS=20/16/63
Partition check:
 hda:
Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 64k freed

Linux version 2.4.21 (address@hidden) (gcc version 3.2.2 20030222 
(Red Hat Linux 3.2.2-5)) #5 Tue Nov 11 18:18:53 CET 2003

QEMU Linux test distribution (based on Redhat 9)

Type 'exit' to halt the system

sh-2.05b# ping -c 3 172.20.0.1
PING 172.20.0.1 (172.20.0.1) 56(84) bytes of data.
From 172.20.0.2 icmp_seq=1 Destination Host Unreachable
From 172.20.0.2 icmp_seq=2 Destination Host Unreachable
From 172.20.0.2 icmp_seq=3 Destination Host Unreachable

--- 172.20.0.1 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2019ms
, pipe 3
sh-2.05b# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.20.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth0
sh-2.05b#


I cannot ping the other direction either (host to QEMU).  Also ^C doesn't go 
through to QEMU.  I first typed ping without the -c and it just kept going...

Clearly I'm not doing something right here.  Any clues?

I'm trying to work my way up to booting KNOPPIX in QEMU.  It boots fine, but 
it cannot find any X server that works and then dies.  Until I get simpler 
things running, I'm not going to worry about that too much :-)

Best,
Kyle