Mailing List Archive

Now that the grant table hypercall wrappers support mappings without
GNTMAP_contains_pte, they should be used instead of invoking the
hypercalls manually.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
---
drivers/block/xen-blkback/blkback.c | 29 ++++-------------------------
1 files changed, 4 insertions(+), 25 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 15ec4db..1e256dc 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -324,6 +324,7 @@ struct seg_buf {
static void xen_blkbk_unmap(struct pending_req *req)
{
struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
+ struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
unsigned int i, invcount = 0;
grant_handle_t handle;
int ret;
@@ -335,25 +336,12 @@ static void xen_blkbk_unmap(struct pending_req *req)
gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
GNTMAP_host_map, handle);
pending_handle(req, i) = BLKBACK_INVALID_HANDLE;
+ pages[invcount] = virt_to_page(vaddr(req, i));
invcount++;
}

- ret = HYPERVISOR_grant_table_op(
- GNTTABOP_unmap_grant_ref, unmap, invcount);
+ ret = gnttab_unmap_refs(unmap, pages, invcount, false);
BUG_ON(ret);
- /*
- * Note, we use invcount, so nr->pages, so we can't index
- * using vaddr(req, i).
- */
- for (i = 0; i < invcount; i++) {
- ret = m2p_remove_override(
- virt_to_page(unmap[i].host_addr), false);
- if (ret) {
- pr_alert(DRV_PFX "Failed to remove M2P override for %lx\n",
- (unsigned long)unmap[i].host_addr);
- continue;
- }
- }
}

static int xen_blkbk_map(struct blkif_request *req,
@@ -381,7 +369,7 @@ static int xen_blkbk_map(struct blkif_request *req,
pending_req->blkif->domid);
}

- ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map, nseg);
+ ret = gnttab_map_refs(map, NULL, &blkbk->pending_page(pending_req, 0), nseg);
BUG_ON(ret);

/*
@@ -401,15 +389,6 @@ static int xen_blkbk_map(struct blkif_request *req,
if (ret)
continue;

- ret = m2p_add_override(PFN_DOWN(map[i].dev_bus_addr),
- blkbk->pending_page(pending_req, i), NULL);
- if (ret) {
- pr_alert(DRV_PFX "Failed to install M2P override for %lx (ret: %d)\n",
- (unsigned long)map[i].dev_bus_addr, ret);
- /* We could switch over to GNTTABOP_copy */
- continue;
- }
-
seg[i].buf = map[i].dev_bus_addr |
(req->u.rw.seg[i].first_sect << 9);
}
--
1.7.7.4


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel