Messages in this thread Patch in this message | | | From | Roger Pau Monne <> | Subject | [PATCH] xen-blkback: use balloon pages for persistent grants | Date | Thu, 14 Feb 2013 11:12:09 +0100 |
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With current persistent grants implementation we are not freeing the persistent grants after we disconnect the device. Since grant map operations change the mfn of the allocated page, and we can no longer pass it to __free_page without setting the mfn to a sane value, use balloon grant pages instead, as the gntdev device does.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: xen-devel@lists.xen.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- drivers/block/xen-blkback/blkback.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index c46824f..e6c2f6a 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -46,6 +46,7 @@ #include <xen/xen.h> #include <asm/xen/hypervisor.h> #include <asm/xen/hypercall.h> +#include <xen/balloon.h> #include "common.h" /* @@ -239,6 +240,7 @@ static void free_persistent_gnts(struct rb_root *root, unsigned int num) ret = gnttab_unmap_refs(unmap, NULL, pages, segs_to_unmap); BUG_ON(ret); + free_xenballooned_pages(segs_to_unmap, pages); segs_to_unmap = 0; } @@ -527,8 +529,8 @@ static int xen_blkbk_map(struct blkif_request *req, GFP_KERNEL); if (!persistent_gnt) return -ENOMEM; - persistent_gnt->page = alloc_page(GFP_KERNEL); - if (!persistent_gnt->page) { + if (alloc_xenballooned_pages(1, &persistent_gnt->page, + false)) { kfree(persistent_gnt); return -ENOMEM; } -- 1.7.7.5 (Apple Git-26) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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