[Xen-devel] toggles user/supervisor privilege level on page entry

[HANNAS YAYA Issa <issa.hannasyaya@xxxxxxxxxxx>]

Hi
I want to toggle user/sypervisor priviledge bit in page table entry 
associated to a given
this page. But I my code does'nt work. I have plenty buggs.
here is the method used to set access to hypervisor level

void remove_access(l1_pgentry_t *pl1e){
l1_pgentry_t ol1e;
l1_pgentry_t nl1e;
unsigned int  nmfn;
if(__copy_from_user(&ol1e, pl1e, sizeof(ol1e)) == 0){
nl1e = ol1e;
nmfn = l1e_get_pfn(ol1e);

if(!(l1e_get_flags(ol1e)&_PAGE_GUEST_KERNEL))
{
l1e_remove_flags(nl1e, _PAGE_USER);
if(__copy_to_guest(pl1e, &nl1e,
sizeof(nl1e)) != 0)
printk("entry cannot be copied\n");
flush_tlb_all();
}
}else
printk("copy from user failed\n");
}

I hope that somebody can help me to resolve the issue.
Thanks

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