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xen-devel
RE: [Xen-devel] New Hypercall Declaration
Do you understand that you must also change the hypervisor to
recognize and do something with your new hypercall? Your userland code
may actually be working and the hypercall may actually be resulting in an entry
into the hypervisor, but unless the hypervisor is modified to recognize the new
hypercall (#56) and do something with it, the hypervisor will generate a return
value of -1 (essentially saying “I don’t recognize this hypercall
number”).
If you have modified the hypervisor, please share that
patch. If not, you will need to modify at least the hypercall_table
and the hypercall_args_table in entry.S (under x86, x86_64, and x86_64/compat, or
all three, depending on the bit-ness of your hypervisor and guest) and create a
do_my_hypercall() routine somewhere. Then of course you will need to
ensure that you are properly building, installing, and booting your newly modified
hypervisor.
Printk’s done inside the hypervisor can be viewed using “xm
dmesg” or via a properly configured serial port.
Use “xm info” and look at cc_compile_date to ensure
you are booting your newly modified hypervisor.
Hope that helps,
Dan
From: Nimgaonkar,
Satyajeet [mailto:SatyajeetNimgaonkar@xxxxxxxxxx]
Sent: Thursday, September 30, 2010 4:03 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] New Hypercall Declaration
Hello Xen Developers,
I am
currently working on declaring a new hypercall in Xen.
For this i have declared my hypercall in xen.h -
#define
__HYPERVISOR_jeet1
56
Then I modified the xcom_privcmd.c to accomodate my hypercall -
case __HYPERVISOR_jeet1:
printk("Successfull Hypercall made to
__HYPERVISOR_jeet1");
I defined the structure for the Hypercall in xc_domain.c
int hypercall_test(int handle){
int rc;
/* Hypercall definitions */
DECLARE_HYPERCALL;
hypercall.op = __HYPERVISOR_jeet1;
rc = do_xen_hypercall(handle, &hypercall);
hypercall.arg[0] = 0;
hypercall.arg[1] = 1;
//printf ("Hypercall Details: %d\n", rc);
//xc_interface_close(handle);
return rc;
}
And then I am calling this Hypercall through an user level program-
#include <xenctrl.h>
#include <stdio.h>
int main(){
printf("Attempt to invoke the hypercall:
__HYPERVISOR_jeet1\n");
int handle, rc;
/* Acquire Hypervisor
Interface Handle.
This handle
goes as the first argument for the function do_xen_hypercall()
*/
handle = xc_interface_open();
printf ("Acquired handle to Xen
Hypervisor:%d\n",handle);
rc = hypercall_test(handle);
printf ("Hypercall Details: %d\n", rc);
xc_interface_close(handle);
return 0;
}
The program compiles properly but gives me -1 error for rc. I have posted the
same query and I got replies on it. But even after trying many things, I am
still stuck with this problem. Can anyone please tell me what I am doing wrong
here. Also please tell me where
should I view the output of printk in xen.
Thanks in advance.
Regards,
Satyajeet Nimgaonkar
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