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Commit d59f5324 authored by Juergen Gross's avatar Juergen Gross Committed by Boris Ostrovsky
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xen: issue warning message when out of grant maptrack entries 



When a driver domain (e.g. dom0) is running out of maptrack entries it
can't map any more foreign domain pages. Instead of silently stalling
the affected domUs issue a rate limited warning in this case in order
to make it easier to detect that situation.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 70513d58

drivers/xen/grant-table.c

+21 −6
Original line number Diff line number Diff line
@@ -1040,18 +1040,33 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, 
		return ret;



	for (i = 0; i < count; i++) {

		/* Retry eagain maps */

		if (map_ops[i].status == GNTST_eagain)

			gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, map_ops + i,

						&map_ops[i].status, __func__);



		if (map_ops[i].status == GNTST_okay) {

		switch (map_ops[i].status) {

		case GNTST_okay:

		{

			struct xen_page_foreign *foreign;



			SetPageForeign(pages[i]);

			foreign = xen_page_foreign(pages[i]);

			foreign->domid = map_ops[i].dom;

			foreign->gref = map_ops[i].ref;

			break;

		}



		case GNTST_no_device_space:

			pr_warn_ratelimited("maptrack limit reached, can't map all guest pages\n");

			break;



		case GNTST_eagain:

			/* Retry eagain maps */

			gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref,

						map_ops + i,

						&map_ops[i].status, __func__);

			/* Test status in next loop iteration. */

			i--;

			break;



		default:

			break;

		}

	}