int mem_access_send_req(struct domain *d, mem_event_request_t *req)
{
int rc = mem_event_claim_slot(d, &d->mem_event->access);
if ( rc < 0 )
return rc;
mem_event_put_request(d, &d->mem_event->access, req);
return 0;
}
* @gfn: guest page to drop
*
* p2m_mem_paging_drop_page() will notify the pager that a paged-out gfn was
* released by the guest. The pager is supposed to drop its reference of the
* gfn.
*/
void p2m_mem_paging_drop_page(struct domain *d, unsigned long gfn,
p2m_type_t p2mt)
{
mem_event_request_t req = { .gfn = gfn };
/* We allow no ring in this unique case, because it won't affect
* correctness of the guest execution at this point. If this is the only
* page that happens to be paged-out, we'll be okay.. but it's likely the
* guest will crash shortly anyways. */
int rc = mem_event_claim_slot(d, &d->mem_event->paging);
if ( rc < 0 )
return;
/* Send release notification to pager */
req.flags = MEM_EVENT_FLAG_DROP_PAGE;
/* Update stats unless the page hasn't yet been evicted */
if ( p2mt != p2m_ram_paging_out )
atomic_dec(&d->paged_pages);
else
/* Evict will fail now, tag this request for pager */
req.flags |= MEM_EVENT_FLAG_EVICT_FAIL;
mem_event_put_request(d, &d->mem_event->paging, &req);
}
