static int blkif_queue_request(struct request *req)
{
struct blkfront_info *info = req->rq_disk->private_data;
- unsigned long buffer_mfn;
+ unsigned long buffer_mfn, buffer_pfn;
struct blkif_request *ring_req;
unsigned long id;
unsigned int fsect, lsect;
BLKIF_MAX_SEGMENTS_PER_REQUEST);
for_each_sg(info->sg, sg, ring_req->u.rw.nr_segments, i) {
- buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg)));
+ buffer_pfn = page_to_pfn(sg_page(sg));
+ buffer_mfn = pfn_to_mfn(buffer_pfn);
fsect = sg->offset >> 9;
lsect = fsect + (sg->length >> 9) - 1;
/* install a grant reference. */
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
+ /*
+ * Set the page as foreign, considering that we are giving
+ * it to a foreign domain.
+ * This is important in case the destination domain is
+ * ourselves, so that we can more easily recognize the
+ * source pfn from destination pfn, both mapping to the same
+ * mfn.
+ */
+ if (xen_pv_domain())
+ set_phys_to_machine(buffer_pfn,
+ FOREIGN_FRAME(buffer_mfn));
}
}
int i;
/* Do not let BLKIF_OP_DISCARD as nr_segment is in the same place
* flag. */
- for (i = 0; i < s->req.u.rw.nr_segments; i++)
+ for (i = 0; i < s->req.u.rw.nr_segments; i++) {
gnttab_end_foreign_access(s->req.u.rw.seg[i].gref, 0, 0UL);
+ if (xen_pv_domain())
+ set_phys_to_machine(s->frame[i],
+ get_phys_to_machine(s->frame[i]) & ~FOREIGN_FRAME_BIT);
+ }
}
static irqreturn_t blkif_interrupt(int irq, void *dev_id)
memcpy(&info->shadow[req->u.rw.id], ©[i], sizeof(copy[i]));
if (req->operation != BLKIF_OP_DISCARD) {
+ unsigned long buffer_pfn;
+ unsigned long buffer_mfn;
/* Rewrite any grant references invalidated by susp/resume. */
- for (j = 0; j < req->u.rw.nr_segments; j++)
+ for (j = 0; j < req->u.rw.nr_segments; j++) {
+ buffer_pfn = info->shadow[req->u.rw.id].frame[j];
+ buffer_mfn = pfn_to_mfn(buffer_pfn);
gnttab_grant_foreign_access_ref(
req->u.rw.seg[j].gref,
info->xbdev->otherend_id,
- pfn_to_mfn(info->shadow[req->u.rw.id].frame[j]),
+ buffer_mfn,
rq_data_dir(info->shadow[req->u.rw.id].request));
+ if (xen_pv_domain())
+ set_phys_to_machine(buffer_pfn, FOREIGN_FRAME(buffer_mfn));
+ }
}
info->shadow[req->u.rw.id].req = *req;