Making a hypercall in DomU

Making a hypercall in DomU

[Srujan D. Kotikela]

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Hi,

I have *implemented a new hypercall* and it is working fine when tested from
the Dom0 user-space. I want to invoke this hypercall from DomU user-space.

I copied all the /usr/lib/libxen* and /usr/include/xen* (recursively) to the
DomU

Here's the code I wrote to invoke hypercall:

#include <stdio.h>
#include <xenctrl.h>

int main(void){

        int xc_handle, rc;

        xc_handle = xc_interface_open();

        printf("\n Opened Interface: %d",xc_handle);

        rc = vb_notify(xc_handle);                       ---- Is a function
implemented in libxc/ which has the hypercall invocation code

        printf("\n vb_notify returned: %d", rc);

        xc_interface_close(xc_handle);

        return rc;
}


When I try to compile the program which contains the hypercall I am getting
error as:

#gcc -lxenctrl notify.c -o Notify
#gcc: error trying to exec 'cc1': execvp: No such file or directory

Same thing works fine from Dom0. Is my approach correct?


--
Srujan D. Kotikela

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Re: Making a hypercall in DomU

[Ian Campbell]

On Thu, 2010-12-02 at 23:42 +0000, Srujan D. Kotikela wrote:
> Hi,
> 
> I have implemented a new hypercall and it is working fine when tested
> from the Dom0 user-space. I want to invoke this hypercall from DomU
> user-space. 
> 
> I copied all the /usr/lib/libxen* and /usr/include/xen* (recursively)
> to the DomU
> 
> Here's the code I wrote to invoke hypercall:
> 
> #include <stdio.h>
> #include <xenctrl.h>
> 
> int main(void){
> 
>         int xc_handle, rc;
> 
>         xc_handle = xc_interface_open();
> 
>         printf("\n Opened Interface: %d",xc_handle);
> 
>         rc = vb_notify(xc_handle);                       ---- Is a
> function implemented in libxc/ which has the hypercall invocation code
> 
>         printf("\n vb_notify returned: %d", rc);
> 
>         xc_interface_close(xc_handle);
> 
>         return rc;
> }
> 
> 
> When I try to compile the program which contains the hypercall I am
> getting error as:
> 
> #gcc -lxenctrl notify.c -o Notify
> #gcc: error trying to exec 'cc1': execvp: No such file or directory

Your domU toolchain seems to be broken, you are missing the cc1 binary
which is an integral (internal) part of gcc. This has nothing particular
to do with Xen.

Ian.

> 
> Same thing works fine from Dom0. Is my approach correct?
> 
> 
> --
> Srujan D. Kotikela