[Xen-devel] unexpected results with xc_domain_get_vcpu_context

["Bryan D. Payne" <bryan@xxxxxxxxxxxx>]

I'm getting some unexpected results with xc_domain_get_vcpu_context.   
Basically, I've written a simple application in domain 0 to view the  
vcpu for another domain.  However, each time that I call  
xc_domain_get_vcpu_context, the value for eip is the same.  Is this  
expected behavior?  I would have expected eip to be changing  
continuously as the machine runs.  Or does this function not give me  
the "live" values?
Here's the code that I'm using...

int main (int argc, char **argv)
{
    int xc_handle;
    vcpu_guest_context_t ctxt;
    struct timespec sleep_timer;

    uint32_t dom = 6;  /* hard code this for easy testing */

    /* setup */
    if ((xc_handle = xc_interface_open()) == -1){
        printf("error opening xc interface\n");
        goto error_exit;
    }

    sleep_timer.tv_sec = 2;
    sleep_timer.tv_nsec = 000000000;  /* 0.00 seconds */
    while (1){

        /* sleep for designated time */
        if (nanosleep(&sleep_timer, NULL) != 0){
            perror("Sleep interrupted, exiting...");
            goto error_exit;
        }

        if (xc_domain_get_vcpu_context(xc_handle, dom, 1, &ctxt) ==  
-1){
            printf("error getting vcpu context\n");
            goto error_exit;
        }

        /* perform the designated task */
        printf("eip = 0x%x\n", ctxt.user_regs.eip);
    }

error_exit:
    if (xc_handle != -1) xc_interface_close(xc_handle);

    return 0;
}


Thanks,
-bryan


-
Bryan D. Payne
Graduate Student, Computer Science
Georgia Tech Information Security Center
http://www.bryanpayne.org




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