[Fedora-xen] kvm crash on f8

[John Summerfield]

I looked at some images in /var/lib/xen/images/ and since they have 
partition tables and look, to me, just like disks, I copied part of my 
hard disk to /var/lib/xen/images/WindowsXP.img

The reason is that I want to try the Windows XP that came preinstalled, 
and copying /dev/sda for a length I calculated includes the entire 
/dev/sda1 partition seems a likely way to test it.
These are the commands:
dd if=/dev/sda of=/var/lib/xen/images/WindowsXP.img count=76597082
dd of=/var/lib/xen/images/WindowsXP.img seek=320072933376 bs=1 count=0

the second makes the disk image seem to be the proper size.

I tried to start it like so:
qemu-kvm -boot c -snapshot -m 256 -smp 2 -std-vga \ 
/var/lib/xen/images/WindowsXP.img

and it choked:

[root at potoroo ~]# qemu-kvm -boot c -snapshot -m 256 -smp 2 -std-vga 
/var/lib/xen/images/WindowsXP.img
vram_pointer=0x2aaac0b5d000
exception 0 (0)
rax 0000000000000022 rbx 0000000000007000 rcx 000000000064e165 rdx 
0000000000000100
rsi 00000000ffff7c05 rdi 000000000008ffea rsp 0000000000001ffe rbp 
0000000000000000
r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 
0000000000000000
r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 
0000000000000000
rip 000000000000fce2 rflags 00033206
cs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
es 0800 (00008000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
tr 0000 (10850000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
gdt fad00/30
idt 0/3ff
cr0 60000010 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
code: d5 03 e4 fc 24 44 d5 03 3e 00 d4 03 00 c0 f8 01 00 00 d5 03 --> f6 
fc 24 44 d5 03 3f 00 d4 03 00 c0 f8 01 00 00 d5 03 08 fd 24 44 d5 03 40 
00 d4 03 00 c0
Aborted
[root at potoroo ~]#


Here is the source disk:
Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xd42ad42a

    Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        8669    69633711    7  HPFS/NTFS
/dev/sda2            8671        9715     8393962+   7  HPFS/NTFS
/dev/sda3            9716        9728      104422+  72  Unknown
/dev/sda4            9729       38913   234428512+   5  Extended
/dev/sda5            9729        9741      104391   83  Linux
/dev/sda6            9742       38913   234324058+  8e  Linux LVM
[root at potoroo ~]#

Partitions 2 and up are unimportant.

fdisk on the disk image reports:
Command (m for help): p

Disk /var/lib/xen/images/WindowsXP.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xd42ad42a

                             Device Boot      Start         End 
Blocks   Id  System
/var/lib/xen/images/WindowsXP.img1   *           1        8669 
69633711    7  HPFS/NTFS
/var/lib/xen/images/WindowsXP.img2            8671        9715 
8393962+   7  HPFS/NTFS
/var/lib/xen/images/WindowsXP.img3            9716        9728 
104422+  72  Unknown
/var/lib/xen/images/WindowsXP.img4            9729       38913 
234428512+   5  Extended

Command (m for help): q

but I had to specify the number of cylinder, 38913 but qemu-kvm rejects 
that nonsense.

Is there a better way to do this? I really want to test running this 
Windows under Linux before allowing it to use the real disk.



-- 

Cheers
John

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