Thanks for your response.

Please find my response below under your reply starting with Avinash.

On Fri, Nov 8, 2013 at 3:11 AM, Udo Steinberg <udo@...121...> wrote:
> On Thu, 7 Nov 2013 20:35:18 +0530 avinash singh (AS) wrote:
>
> Hi Avinash,
>
> AS> I want to discuss two problem.
> AS>
> AS> Problem -1:
> AS> This test program runs (guest mode code) cpuid instruction but outb/inb
> AS> instruction never runs in guest mode. I see that for outb instruction
> AS> gives IO portal invoked again and again. First, I
> AS> delegate IO ports from Kernel in root pd. My vcpu execution context
> AS> is created in root pd. I believe that IO ports should be accessible
> AS> from guest mode after delegating IO ports from kernel to guest.
> AS> Secondly, same code for AMD runs if I set proper AMD vcpu registers in
> AS> startup handler.
>
> NOVA distinguishes between I/O ports being accessible in host mode or guest
> mode. If you delegate an I/O CRD into a PD, the ports will be accessible in
> host mode only, unless you also set the G-bit in the typed item. Only if you
> set the G-bit during the delegation will the I/O ports be directly
> accessible in guest mode without causing a VM exit. See spec. 4.6.2.2

Avinash: ->>
 I do understand that without setting G bit in typed item resource wont be available for guest to access.

In My code, I am launching vcPU in protected mode with paging disabled with 'nonpt' command line option.
I guest IO_ACCESS_PORTAL invoked  for outb instruction as expected. In vcpu IO access portal handler, I delegate IO ports to guest. Please see below code in file main.cc line number:293


270 static void
271 vcpu_ioaccess_handler(void)
272 {
273     Utcb *utcb = reinterpret_cast<Utcb *>(ECHO_THREAD_UTCB);
274
275     out()->text("IOACCES invoked  \n");
276
277     out()->text("IP ");
278     out()->hex(utcb->ip);
279     out()->text("\n");
280
281     out()->text("dx ");
282     out()->hex(utcb->dx);
283     out()->text("\n");
284
285     static mword_t prev_dx = ~0;
286     if (prev_dx == utcb->dx) {
287         out()->text("IOACCESS: Duplicate Request...\n");
288         HALT();
289     }
290     prev_dx = utcb->dx;
291    
292     utcb->set_msg_word(0);
293     if (! utcb->append_item(Io_crd(0, 16), 0, true, true)) {
294     }
295    
296     reply(reinterpret_cast<void *>(event_ec_stack_top()));
297 }
298