static int gnttab_map_frames_v2(xen_pfn_t *frames, unsigned int nr_gframes)
{
uint64_t *sframes;
unsigned int nr_sframes;
struct gnttab_get_status_frames getframes;
int rc;
nr_sframes = nr_status_frames(nr_gframes);
/* No need for kzalloc as it is initialized in following hypercall
* GNTTABOP_get_status_frames.
*/
sframes = kmalloc(nr_sframes * sizeof(uint64_t), GFP_ATOMIC);
if (!sframes)
return -ENOMEM;
getframes.dom = DOMID_SELF;
getframes.nr_frames = nr_sframes;
set_xen_guest_handle(getframes.frame_list, sframes);
rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames,
&getframes, 1);
if (rc == -ENOSYS) {
kfree(sframes);
return -ENOSYS;
}
BUG_ON(rc || getframes.status);
rc = arch_gnttab_map_status(sframes, nr_sframes,
nr_status_frames(gnttab_max_grant_frames()),
&grstatus);
BUG_ON(rc);
kfree(sframes);
rc = arch_gnttab_map_shared(frames, nr_gframes,
gnttab_max_grant_frames(),
&gnttab_shared.addr);
BUG_ON(rc);
return 0;
}
static void gnttab_unmap_frames_v2(void)
{
arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames));
}
static int xenmem_add_to_physmap_one(
struct domain *d,
uint16_t space,
domid_t foreign_domid,
unsigned long idx,
xen_pfn_t gpfn)
{
unsigned long mfn = 0;
int rc;
switch ( space )
{
case XENMAPSPACE_grant_table:
spin_lock(&d->grant_table->lock);
if ( d->grant_table->gt_version == 0 )
d->grant_table->gt_version = 1;
if ( d->grant_table->gt_version == 2 &&
(idx & XENMAPIDX_grant_table_status) )
{
idx &= ~XENMAPIDX_grant_table_status;
if ( idx < nr_status_frames(d->grant_table) )
mfn = virt_to_mfn(d->grant_table->status[idx]);
}
else
{
if ( (idx >= nr_grant_frames(d->grant_table)) &&
(idx < max_nr_grant_frames) )
gnttab_grow_table(d, idx + 1);
if ( idx < nr_grant_frames(d->grant_table) )
mfn = virt_to_mfn(d->grant_table->shared_raw[idx]);
}
d->arch.grant_table_gpfn[idx] = gpfn;
spin_unlock(&d->grant_table->lock);
break;
case XENMAPSPACE_shared_info:
if ( idx == 0 )
mfn = virt_to_mfn(d->shared_info);
break;
case XENMAPSPACE_gmfn_foreign:
{
paddr_t maddr;
struct domain *od;
rc = rcu_lock_target_domain_by_id(foreign_domid, &od);
if ( rc < 0 )
return rc;
maddr = p2m_lookup(od, idx << PAGE_SHIFT);
if ( maddr == INVALID_PADDR )
{
dump_p2m_lookup(od, idx << PAGE_SHIFT);
rcu_unlock_domain(od);
return -EINVAL;
}
mfn = maddr >> PAGE_SHIFT;
rcu_unlock_domain(od);
break;
}
default:
return -ENOSYS;
}
domain_lock(d);
/* Map at new location. */
rc = guest_physmap_add_page(d, gpfn, mfn, 0);
domain_unlock(d);
return rc;
}