int arch_livepatch_quiesce(void)
{
mfn_t text_mfn;
unsigned int text_order;
if ( vmap_of_xen_text )
return -EINVAL;
text_mfn = virt_to_mfn(_start);
text_order = get_order_from_bytes(_end - _start);
/*
* The text section is read-only. So re-map Xen to be able to patch
* the code.
*/
vmap_of_xen_text = __vmap(&text_mfn, 1U << text_order, 1, 1, PAGE_HYPERVISOR,
VMAP_DEFAULT);
if ( !vmap_of_xen_text )
{
printk(XENLOG_ERR LIVEPATCH "Failed to setup vmap of hypervisor! (order=%u)\n",
text_order);
return -ENOMEM;
}
return 0;
}
void *vmap(const unsigned long *mfn, unsigned int nr)
{
return __vmap(mfn, 1, nr, 1, PAGE_HYPERVISOR);
}