[Lguest] PAE support

[Matias Zabaljauregui]

Hello Rusty,

>> I started to look at kvm hypercalls code.
>> If you can give some hints about this issue, I can try to do it.
>
> Sure.  The first step is to use the kvm_hypercall* functions in
> asm/kvm_para.h.  I think that will come out as a UD trap (trap 6) into the
> host, which will then have to check the ringlevel == GUEST_PL, check the
> instruction sequence was really a vmcall, then run the hypercall like normal.

ok, with your explanation I was able to get to the point where hcall
function (in lguest_hcall.h) is like this

hcall(unsigned long call,
      unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
	kvm_hypercall3(call, arg2, arg3, arg1);
	return call;
}

and it works.
Now, what would be the next step ?
We can easily replace hcall() calls with the corresponding
kvm_hypercallX  (X depending on the arguments count).

But, we have a lot of  lazy_hcall() invocations, no matter the amount
of arguments.
So I guess we could write lazy_callX()  variants, where X is the the
arguments count or
just call kvm_hypercall3(call, arg2, arg3, arg1) from lazy_call() and
forget about the number
of arguments (which is exactly what actual code does).


thanks
Matias













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