[Xen-devel] Question about using xenctl

[吴佳民 <wujiamin_tyut@xxxxxxx>]

Hi:
  I wanna domU to map dom0's page, so that these two domain can receive/send data between them in the future. But when I run my code , it told me that "Could not open grant table interface(22=invalid argument)".
  Can anybody know what the problem is ?
  Thanks .
                        Danius Wu.
======
The Result of running my codes:
[root@vm1 program]# gcc -g -Wall -lxenctrl test.c -o test
[root@vm1 program]# ./test
ERROR Internal error: Could not open grant table interface (22 = Invalid argument)
Open xcg_handle Error!
[root@vm1 program]#

=======
Source code:
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <sys/select.h>
#include <xenctrl.h>
#include <sys/mman.h>
 
int main(void)
{
        int xcg_handle;
        xcg_handle = xc_gnttab_open();
        if(xcg_handle == -1)
        {
            printf("Open xcg_handle Error!\n");
            return -1;
        }
        else
            printf("Open xcg_handle Success!\n");
       
        void* start_address;
        start_address = xc_gnttab_map_grant_ref(xcg_handle, 0, 3,PROT_WRITE);
        if(start_address != NULL)
        {
            printf("mapping success!\n");
        }
        else
        {
            printf("mapping errror!=n");
        }

        xc_gnttab_close(xcg_handle);         
      return 0;
}
==============================================
   

 

---

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