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| author | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2011-02-08 15:14:06 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-02-14 20:16:19 +0100 |
| commit | 0ea22f072fb1b3da4307573c280ce904f0bf1589 (patch) | |
| tree | 5f3bd88b137cb3682ed06065d61bf687c58be14d | |
| parent | xen-gntdev: Fix memory leak when mmap fails (diff) | |
| download | linux-0ea22f072fb1b3da4307573c280ce904f0bf1589.tar.xz linux-0ea22f072fb1b3da4307573c280ce904f0bf1589.zip | |
xen-gntdev: Fix unmap notify on PV domains
In paravirtualized guests, the struct page* for mappings is only a
placeholder, and cannot be used to access the granted memory. Use the
userspace mapping that we have set up in order to implement
UNMAP_NOTIFY_CLEAR_BYTE.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| -rw-r--r-- | drivers/xen/gntdev.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 2aa83166da32..75f8037c9833 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -289,7 +289,12 @@ static int unmap_grant_pages(struct grant_map *map, int offset, int pages) if (map->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) { int pgno = (map->notify.addr >> PAGE_SHIFT); - if (pgno >= offset && pgno < offset + pages) { + if (pgno >= offset && pgno < offset + pages && use_ptemod) { + void __user *tmp; + tmp = map->vma->vm_start + map->notify.addr; + copy_to_user(tmp, &err, 1); + map->notify.flags &= ~UNMAP_NOTIFY_CLEAR_BYTE; + } else if (pgno >= offset && pgno < offset + pages) { uint8_t *tmp = kmap(map->pages[pgno]); tmp[map->notify.addr & (PAGE_SIZE-1)] = 0; kunmap(map->pages[pgno]); @@ -298,7 +303,7 @@ static int unmap_grant_pages(struct grant_map *map, int offset, int pages) } pr_debug("map %d+%d [%d+%d]\n", map->index, map->count, offset, pages); - err = gnttab_unmap_refs(map->unmap_ops + offset, map->pages, pages); + err = gnttab_unmap_refs(map->unmap_ops + offset, map->pages + offset, pages); if (err) return err; |