Re: [Xen-devel] In which library can I find these functions ?

[Sébastien Frémal <sebastien.fremal@xxxxxxxxx>]

Thank you, it works !! I didn't knew this functionnality.

I attach the working code for example in case of somebody have the same issue.

#undef __KERNEL__

#define __KERNEL__

#undef MODULE

#define MODULE

#include <xen/page.h>

#include <xen/grant_table.h>

#include <linux/gfp.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

MODULE_LICENSE("GPL");

unsigned long myPage;

static int __init hello_init(void){

//      int domB = atoi(argv[1]);

        printk(KERN_INFO "Test sur le partage de mémoire dans Xen \n");

        if((myPage = get_zeroed_page(GFP_KERNEL))==0)

                printk(KERN_INFO "Zeroed page\n");

        grant_ref_t gref;

        gref = gnttab_grant_foreign_access(1, virt_to_mfn(myPage), 0);

        if(gref < 0){

                printk(KERN_INFO "Grant failed\n");

                free_page(myPage);

        }

        return 0;

}

static void __exit hello_exit(void){

        free_page(myPage);

        printk(KERN_INFO "Cleaning module.\n");

}

module_init(hello_init);

module_exit(hello_exit);

UMONS

Ir Doctorant S. Frémal
Université de Mons
Service d'Informatique
Rue de Houdain,  n°9
7000 Mons
+32(0)65/37.40.51

www.umons.ac.be

2013/1/31 Olaf Hering <olaf@xxxxxxxxx>

On Tue, Jan 29, Sébastien Frémal wrote:

> The code is compiling, but when I try to launch the insert the module, I get
> error messages :
>
> [95265.790842] shmxen: Unknown symbol gnttab_grant_foreign_access (err 0)
> [95265.790855] shmxen: Unknown symbol xen_features (err 0)
> [95265.790865] shmxen: Unknown symbol get_phys_to_machine (err 0)
>                                             
> I'm searching for libraries to link with the module so it can use these

drivers/xen/grant-table.c:EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
drivers/xen/features.c:EXPORT_SYMBOL_GPL(xen_features);
arch/x86/xen/p2m.c:EXPORT_SYMBOL_GPL(get_phys_to_machine);

The posted code is not marked as GPL, so the module linking code will
not consider the required functions.

Olaf

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