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authorRoger Pau Monne <roger.pau@citrix.com>2013-02-14 10:12:09 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-03 22:03:35 (GMT)
commitdfd7c4e87378a9d9d7087df5c0e11aa34c1b8231 (patch)
tree7df65f847c1838638e30c1a9f387cc8a34be884e /drivers/block
parenta4c06c2a9b1cfdd6f0e310f93de35549cb72fec8 (diff)
downloadlinux-fsl-qoriq-dfd7c4e87378a9d9d7087df5c0e11aa34c1b8231.tar.xz
xen-blkback: use balloon pages for persistent grants
commit 087ffecdaa1875cc683a7a5bc0695b3ebfce3bad upstream. 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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/xen-blkback/blkback.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 1966a7c..de1f319 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;
}