[Xen-devel] NetBSD qemu-dm problem

[Adam Hamsik <haaaad@xxxxxxxxx>]

Hi folks, 

As you probably know NetBSD can supports dom0, domU in i386, i386PAE, amd64 
modes. I have found one bug which I would like to fix in our implementation, 
but I need some guidance to be able to identify what's wrong.

If I create HVM domain with disk located on hw device or Logical Volume 

disk = [ 'file:/home/xenstuff/FreeBSD.img,ioemu:hda,w', 
         'phy:/dev/mapper/rvg00-testlv,ioemu:hdb,w'
        ]

disk hdb(size 20Gb) is detected as this (from xm dmesg)

(XEN) HVM27: ata0-0: PCHS=14563/16/63 translation=none LCHS=1024/16/63
(XEN) HVM27: ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (7168 MBytes)
(XEN) HVM27: ata0-1: PCHS=81/16/63 translation=none LCHS=81/16/63
(XEN) HVM27: ata0  slave: QEMU HARDDISK ATA-7 Hard-Disk (  40 MBytes)
(XEN) HVM27: 
(XEN) HVM27: Press F10 to select boot device.
(XEN) HVM27: Booting from Hard Disk...
(XEN) HVM27: int13_harddisk: function 08, unmapped device for ELDL=82
(XEN) HVM27: int13_harddisk: function 08, unmapped device for ELDL=83
(XEN) HVM27: int13_harddisk: function 08, unmapped device for ELDL=84
(XEN) HVM27: int13_harddisk: function 08, unmapped device for ELDL=85
(XEN) HVM27: int13_harddisk: function 08, unmapped device for ELDL=86
(XEN) HVM27: int13_harddisk: function 08, unmapped device for ELDL=87
(XEN) io.c:199:d27 MMIO emulation failed @ 0020:c0bab5d0: 0f ae 3b 01 d3 01

In qemu.log(I have added some fprintfs to raw_open) I can find this.

# less qemu-dm-FreeBSD8.log                                                     
                                                                                
   
domid: 27
qemu: the number of cpus is 1
CAlling bdrv_open2 /home/xenstuff/FreeBSD.img
raw open called /home/xenstuff/FreeBSD.img
open syscall errno 2 -- open_flags 2 - |/home/xenstuff/FreeBSD.img|
CAlling bdrv_open2 /dev/mapper/rvg00-testlv
raw open called /dev/mapper/rvg00-testlv
open syscall errno 2 -- open_flags 2 - |/dev/mapper/rvg00-testlv|
Watching /local/domain/0/device-model/27/logdirty/next-active
Watching /local/domain/0/device-model/27/command
Opening device /home/xenstuff/FreeBSD.img
Opening device /dev/mapper/rvg00-testlv
qemu_map_cache_init nr_buckets = 10000 size 3145728
shared page at pfn 17ffe
buffered io page at pfn 17ffc
Time offset set 0
Register xen platform.
Done register platform.
I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0

I have changed raw_getlength to support NetBSD, so there shouldn't be problem 
in device size detection. I think that problem is somewhere in NetBSD but I 
need some guidance where to look in xen source tree to find out what can be 
wrong. This problem was found on xen-3.3.2 and xen-unstable. Do you have any 
ideas where I should look to fix this problem ?

Regards

Adam.


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