Xen devel - Jul 2013 - set the eflags.tf of VM

hi,all
    has anyone  set the eflags.TF of vm?
    I want to introdeuce a VM into  single-step by setting  the eflags.TF
of vm, then I disassemble the bytes at RIP to figure out what''s going
on .
    I have set the trap flag ,but I didn''t achieve what I want. First,
I
only get hlt,mov, rdtsc, clts, in, out . Second, the VM always  crash.
    does anyone have experience and  give me some help?
----------------------------------------------------------
best regards,
yandong


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On Tue, 9 Jul 2013 16:59:27 +0800
yandong han <toyandong@gmail.com> wrote:
> hi,all
>     has anyone  set the eflags.TF of vm?
>     I want to introdeuce a VM into  single-step by setting  the
> eflags.TF of vm, then I disassemble the bytes at RIP to figure out
> what''s going on . I have set the trap flag ,but I didn''t
achieve what
> I want. First, I only get hlt,mov, rdtsc, clts, in, out . Second, the
> VM always  crash. does anyone have experience and  give me some help?
> ----------------------------------------------------------
> best regards,
> yandong
If it''s HVM, look at MTF, otherwise look at debugger_trap_entry and
it''s
callers. Can''t you just use gdbsx in tools/debugger/gdbsx? You can look
at gdbsx source too...

Mukesh