[Xen-devel] Re: [PATCH][RFC] Emulating real mode with x86_emulate

["Kamble, Nitin A" <nitin.a.kamble@xxxxxxxxx>]

Hi Anthony,
> Perhaps you did --emulate-16bit instead of -emulate-16bit?  The patch 
> definitely has the added option.
You are right, it was -emulate-16bit.

> >    - I tried hardcoding this to 1 in the qemu code, and found that the 
> > port x595 is not reflecting it correctly to hvmloader.
>
> Are you sure you don't have something stale?
I started with a fresh tree for your patch. I also tried rebuilding the quemu from start.
> I suspect you have a partial install or something.  I have never seen 
> this happen.
I have already tried few times. i will try one more time with newer fresh xen-unstable tree. Some of the debug messages were coming from my prinks.
> You should see x86_emulate run for a good number of instructions.  The 
> odd thing about your log is that the transfering control to x86_emulate 
> message uses the EIP from the vmcs.  If this is the first time the 
> emulator is being invoked, how can eip be 0?  There's nothing in the 
> emulate path that would touch the vmcs.
>
> How exactly are you forcing the use of the emulator instead of vmxassist?
I basically forced emulate_16bit varilable in qemu to 1. 

int acpi_enabled = 0;
int fd_bootchk = 1;
int emulate_16bit = 1;

and in the hvmloader instead of checking the output of the port 595, I replaced it with if (1).
like this:
#if 0
        if (inl(0x595) == 0xdeadbeef) {
#else
        if (1) {
#endif

Thanks & Regards,
Nitin
Open Source Technology Center, Intel Corporation.
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