Kamble, Nitin A wrote:

Anthony,
eip of 0x0 is the right address.
Because the trampoline_Start code is relocated to address 0.
 /* Relocate real-mode trampoline to 0x0. */
 " mov $trampoline_start,%esi \n"
 " xor %edi,%edi \n"
 " mov $trampoline_end,%ecx \n"
 " sub %esi,%ecx \n"
 " rep movsb \n"

Still there is no progress in the emulation. The guest is dying with triple-fault just like before.

Thanks & Regards,
Nitin
Open Source Technology Center, Intel Corporation.
-------------------------------------------------------------------------
The mind is like a parachute; it works much better when it's open.
On Fri, 2007年03月30日 at 14:08 -0700, Nitin A Kamble wrote:

Hi Anthony,
On Fri, 2007年03月30日 at 14:00 -0500, Anthony Liguori wrote:

 /* Enter real mode, reload all segment registers and IDT. */
 " ljmp 0ドルx8,0ドルx0 \n"
 "trampoline_start: .code16 \n"
 " mov %eax,%cr0 \n"
That change was pretty recent so unless it was reverted it should Just Work.
Regards,
Anthony Liguori

Now I see cr0 is updated after returning from main.
 I enabled the debug log in the xen code now.

(XEN) HVM2: Creating MP tables ... (XEN) HVM2: Loading Cirrus VGABIOS ... (XEN) HVM2: Loading ACPI ... (XEN) HVM2: Loading VMXAssist ... deadbeef (XEN) HVM2: foo (XEN) hvmop_emulate_realmode (XEN) guest requests real mode emulation (XEN) foo 221 (XEN) HVM2: Invoking ROMBIOS ... (XEN) vmx_vmexit_handler called. eip = 0x0 (XEN) vmx_cr_access called eip=0x0 (XEN) mov_to_cr 0 called eip=0x0 (XEN) vmx_set_cr0 called eip=0x0 (XEN) Transfering -- control to x86_emulate eip 0x0 (XEN) hvm.c:446:d2 Triple fault on VCPU0 - invoking HVM system reset.

It shows cr0 is getting modified. But the eip is still 0x0.

Regards,
Anthony Liguori

Thanks & Regards,
Nitin
Open Source Technology Center, Intel Corporation.
-------------------------------------------------------------------------
The mind is like a parachute; it works much better when it's open.

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