[Xen-devel] Doamin crash when trying to install disk encryption (PointSec) on Windows HVM

[Tom Rotenberg <tom.rotenberg@xxxxxxxxx>]

Hi all,

i am trying to install the disk encryption software: 'PointSec', on a Windows HVM. After the product is installed, in my second reboot, when the PointSec is trying to load is UI, the domain is crashing, with the following error:

(XEN) HVM2: Booting from Hard Disk...
(XEN) HVM2: Booting from 0000:7c00
(XEN) realmode.c:115:d2 Failed to emulate insn.
(XEN) realmode.c:165:d2 Real-mode emulation failed @ 1eae:00000787: 0f 00 d0 e4 70 0c
(XEN) domain_crash called from realmode.c:166
(XEN) Domain 2 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-3.4.0-rc3-pre  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    1eae:[<0000000000000787>]
(XEN) RFLAGS: 0000000000004046   CONTEXT: hvm guest
(XEN) rax: 0000000000000000   rbx: 0000000000000007   rcx: 0000000000100000
(XEN) rdx: 0000000000000000   rsi: 0000000000000000   rdi: 0000000000000000
(XEN) rbp: 0000000000008ebf   rsp: 0000000000017a5e   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000000000011   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: 0040   es: 0080   fs: 0040   gs: 0040   ss: 2112   cs: 1eae


To me, it looks like the xen real-mode emulator fails to emulate the "LLDT" instruction.
I disassembled the code (as reported from the real-mode error message), and it looks like this:
LLDT AX
IN AL, 70
OR AL, 8B

AFAIK, the PointSec is trying to load his UI (which is probably coded in realmode) in this stage, and i guess that some of the instrctions he uses aren't emulated in Xen.

I am using xen-unstable, changeset: 19553 (from April 16), and the machione i am working on, is a Lenovo T500.

Can someone please help me with this, as i am not really familiar with the real mode emulation code?

Thanks,
        Tom

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