RE: [Xen-devel] Re: problems with console in domU if physdev access enabled

["Maurice" <tux@xxxxxxxx>]

> > > > I am trying to build a working domU kernel with 
> > > > CONFIG_XEN_PHYSDEV_ACCESS=y. But
> > > > if this enabled, domU fails to boot with different errors 
> > > > about the console.
> > > > With kernel 2.6.10 and xen 2.0.5 this error occurs if I try 
> > > > to start the Domain:
> > > > ..
> > > > WARNING: Failed to register Xen virtual console driver as 'tty1'
> > > > ..
> > > > Warning: unable to open an initial console.
> > > > Unable to handle kernel NULL pointer dereference at virtual 
> > > 
> > > It sounds like you might be building in a serial UART 
> > (8250) into your
> > > domU kernel which is grabbing the tty.
> > 
> > CONFIG_SERIAL_8250 was not set, I've also tried with set it 
> > to y, but it makes
> > no difference.
> > 
> > It would be very helpful if someone who use xen with 
> > physdev-access enabled
> > could send me his/her kernel-config.
> 
> If you post the full boot messages it will probably be possible to spot
> what you're doing wrong.
No Problem:
--------------------------------------------------------------------
Started domain ttylinux, console on port 9646
************ REMOTE CONSOLE: CTRL-] TO QUIT ********
Linux version 2.6.10-moe-r6-gaga (root@xxxxxxxxxxxxx) (gcc-Version 3.3.5
(Gentoo Linux 3.3.5-r1, ssp-3.3.2-3, pie-8.7.7.1)) #26 Sat Mar 19 12:59:11
CET 2005
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000008000000 (usable)
128MB LOWMEM available.
DMI not present.
IRQ lockup detection disabled
Built 1 zonelists
Kernel command line:  root=/dev/hda1 ro xencons=tty console=tty
devfs=nomount
Initializing CPU#0
PID hash table entries: 1024 (order: 10, 16384 bytes)
Xen reported: 1002.303 MHz processor.
Using tsc for high-res timesource
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 127104k/131072k available (1578k kernel code, 3796k reserved, 444k
data, 120k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 256K
CPU: Intel Pentium III (Coppermine) stepping 0a
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... disabled
NET: Registered protocol family 16
xen_mem: Initialising balloon driver.
Initializing Cryptographic API
inotify device minor=63
i8042.c: Can't read CTR while initializing i8042.
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
WARNING: Failed to register Xen virtual console driver as 'tty1'
Event-channel device installed.
xen_blk: Initialising virtual block device driver
elevator: using anticipatory as default io scheduler
xen_net: Initialising virtual ethernet driver.
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2
IP: routing cache hash table of 1024 buckets, 8Kbytes
TCP: Hash tables configured (established 8192 bind 16384)
NET: Registered protocol family 1
NET: Registered protocol family 17
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 120k freed
Warning: unable to open an initial console.
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
c01f6262
*pde = ma 00000000 pa 55555000
 [<c01f6451>] vc_allocate+0xa1/0x1b0
 [<c01f9a38>] con_open+0x48/0xc0
 [<c01e7e1d>] tty_open+0x24d/0x2d0
 [<c01e7bd0>] tty_open+0x0/0x2d0
 [<c015ecca>] chrdev_open+0xea/0x1d0
 [<c01549ca>] dentry_open+0x15a/0x240
 [<c0154868>] filp_open+0x68/0x70
 [<c0115fa0>] default_wake_function+0x0/0x20
 [<c0154ae9>] get_unused_fd+0x39/0xe0
 [<c0154c54>] sys_open+0x44/0xd0
 [<c0109758>] syscall_call+0x7/0xb
Oops: 0000 [#1]
PREEMPT 
Modules linked in:
CPU:    0
EIP:    0061:[<c01f6262>]    Not tainted VLI
EFLAGS: 00010246   (2.6.10-moe-r6-gaga) 
EIP is at visual_init+0x72/0x1c0
eax: 00000000   ebx: c03ff800   ecx: 00000000   edx: c03ff800
esi: 00000000   edi: 00000001   ebp: 00000000   esp: c0361e90
ds: 007b   es: 007b   ss: 0069
Process init (pid: 1, threadinfo=c0360000 task=c00389e0)
Stack: 00000000 000000d0 c03ff800 00000000 c01f6451 00000000 00000001
00000000 
       c03f3960 00000000 00000000 c1266000 00400000 c01f9a38 00000000
c005a000 
       c00886a0 00000001 c01e7e1d c1266000 c00886a0 c0361eec 00008800
c1266000 
Call Trace:
 [<c01f6451>] vc_allocate+0xa1/0x1b0
 [<c01f9a38>] con_open+0x48/0xc0
 [<c01e7e1d>] tty_open+0x24d/0x2d0
 [<c01e7bd0>] tty_open+0x0/0x2d0
 [<c015ecca>] chrdev_open+0xea/0x1d0
 [<c01549ca>] dentry_open+0x15a/0x240
 [<c0154868>] filp_open+0x68/0x70
 [<c0115fa0>] default_wake_function+0x0/0x20
 [<c0154ae9>] get_unused_fd+0x39/0xe0
 [<c0154c54>] sys_open+0x44/0xd0
 [<c0109758>] syscall_call+0x7/0xb
Code: 60 bb 32 c0 a1 4c bb 32 c0 89 42 28 8b 14 b5 a0 cc 32 c0 85 d2 74 0a
8b 04 b5 60 bb 32 c0 89 50 28 8b 14 b5 60 bb 32 c0 8b 42 28 <8b> 18 85 db 74
35 89 1c 24 e8 a0 a4 f3 ff 85 c0 0f 84 09 01 00 
 <0>Kernel panic - not syncing: Attempted to kill init!
 <0>Rebooting in 1 seconds..
--------------------------------------------------------------------

THX for help, Maurice


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