[Xen-bugs] [Bug 85] New: xenU fail to create with shadow mode enabling

[yongkang.you@xxxxxxxxx]

http://bugzilla.xensource.com/cgi-bin/bugzilla/show_bug.cgi?id=85

           Summary: xenU fail to create with shadow mode enabling
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: yongkang.you@xxxxxxxxx


Environment:
------------
Service OS ia32
Guest OS ia32

This bug can be reproduced either in xen version:1.1730 or 1.1746

Bug detailed description:
--------------------------
xenU fail to create with shadow mode enabling.

Reproduce steps:
----------------
1. Get the xen unstalbe source code.
2. Compile the domU kernel with CONFIG_XEN_SHADOW_MODE 
Go into patched linux-2.6.11-xenU, 
ARCH=xen make menuconfig
Enter Xen option and select Fake Shadow Mode

3. make world
4. run dist/install.sh
5. reboot the system and enter service OS.
6. Config a domU, /etc/xen/domU
/etc/xen/domu is like:
kernel = "/boot/vmlinuz-2.6.11-xenU"
memory = 32
name = "DOMU"
disk = [ 'file:/data/rootfs,sda1,w' ]
root = "/dev/sda1 ro"
extra = "4"

7. xend start;xm list
[root@vt-yyou ~]# xm list
Name              Id  Mem(MB)  CPU VCPU(s)  State  Time(s)  Console
Domain-0           0      256    0      1   r----    101.2         

8. xm create -f /etc/xen/domU
9. xm list
[root@vt-yyou ~]# xm list
Name              Id  Mem(MB)  CPU VCPU(s)  State  Time(s)  Console
Domain-0           0      256    0      1   r----    108.6         

10. xm create -c /etc/xen/domU
[root@vt-yyou ~]# xm create -c /etc/xen/domU 
Using config file "/etc/xen/domU".
VNC= 2

VNC viewer for X version 4.0 - built Oct  6 2004 08:06:12
Copyright (C) 2002-2004 RealVNC Ltd.
See http://www.realvnc.com for information on VNC.
Started domain DOMU, console on port 9602
************ REMOTE CONSOLE: CTRL-] TO QUIT ********

************ REMOTE CONSOLE EXITED *****************

11. xm dmesg
(XEN) Domain 1 (vcpu#0) crashed on cpu#0:
(XEN) CPU:    0
(XEN) EIP:    e019:[<c0112ecf>]      
(XEN) EFLAGS: 00000282   CONTEXT: guest
(XEN) eax: ffffffea   ebx: c02fdf34   ecx: 00000001   edx: 00000000
(XEN) esi: 00007ff0   edi: c0102fc0   ebp: c0341000   esp: c02fdf28
(XEN) cr0: 8005003b   cr3: 3f0fc000
(XEN) ds: e021   es: e021   fs: 0000   gs: e021   ss: e021   cs: e019
(XEN) Guest stack trace from esp=c02fdf28:
(XEN)    c0112ecf 0001e019 00010282 00000005 0003f33b 00000001 c0309fa3 
00000000 
(XEN)    c0341fc0 c0308261 00102000 00002000 00000000 c0309f7f c0327114 
00000000 
(XEN)    c0311658 c0101000 00000000 c0308379 00000000 00000000 c0311658 
c031c8d8 
(XEN)    c0305243 c02fdff4 c0311a60 00000080 ffffff81 00000000 c02fc000 
00000000 
(XEN)    0000007c 00000000 c01188b2 0000000a 00000400 c028e7c0 c02fdfe4 
c02fc000 
(XEN)    c0343200 c02fc000 c0343200 c031c620 00000000 c02fe59f c02fdff4 
00000000 
(XEN)    00000000 00000000 00000000 c031cc80 00010800 c010006c 

12. objdump -d linux-2.6.11-xenU/vmlinux|grep c0112ecf
...
c0112e90 <xen_pt_switch>:
c0112e90:   56                      push   %esi
c0112e91:   b9 01 00 00 00          mov    $0x1,%ecx
c0112e96:   be f0 7f 00 00          mov    $0x7ff0,%esi
c0112e9b:   53                      push   %ebx
c0112e9c:   83 ec 10                sub    $0x10,%esp
c0112e9f:   8b 44 24 1c             mov    0x1c(%esp),%eax
c0112ea3:   8b 15 00 c4 31 c0       mov    0xc031c400,%edx
c0112ea9:   c7 04 24 05 00 00 00    movl   $0x5,(%esp)
c0112eb0:   c1 e8 0c                shr    $0xc,%eax
c0112eb3:   89 e3                   mov    %esp,%ebx
c0112eb5:   8b 04 82                mov    (%edx,%eax,4),%eax
c0112eb8:   31 d2                   xor    %edx,%edx
c0112eba:   89 44 24 04             mov    %eax,0x4(%esp)
c0112ebe:   b8 1a 00 00 00          mov    $0x1a,%eax
c0112ec3:   cd 82                   int    $0x82
c0112ec5:   85 c0                   test   %eax,%eax
c0112ec7:   78 06                   js     c0112ecf <xen_pt_switch+0x3f>
c0112ec9:   83 c4 10                add    $0x10,%esp
c0112ecc:   5b                      pop    %ebx
c0112ecd:   5e                      pop    %esi
c0112ece:   c3                      ret
c0112ecf:   0f 0b                   ud2a
c0112ed1:   66                      data16
c0112ed2:   00 14 5c                add    %dl,(%esp,%ebx,2)
c0112ed5:   29 c0                   sub    %eax,%eax
c0112ed7:   eb f0                   jmp    c0112ec9 <xen_pt_switch+0x39>
...

Current result:         
----------------
xenU couldn't be created with shadow mode enable.


Expected result:                
----------------
xenU could be created either shadow mode enable or disable.



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