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authorIan Campbell <Ian.Campbell@citrix.com>2013-12-06 17:55:56 +0000
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2013-12-06 17:55:56 +0000
commitb6497b383f65dd1bc60ea1f5d70e157a268fbd15 (patch)
treebae7233a155e97c6dd8c986ae5822fb1459f498e /drivers/xen
parentc94cae53f9e564484f906a79be5639fc66e8cb02 (diff)
downloadop-kernel-dev-b6497b383f65dd1bc60ea1f5d70e157a268fbd15.zip
op-kernel-dev-b6497b383f65dd1bc60ea1f5d70e157a268fbd15.tar.gz
xen: privcmd: do not return pages which we have failed to unmap
This failure represents a hypervisor issue, but if it does occur then nothing good can come of returning pages which still refer to a foreign owned page into the general allocation pool. Instead we are forced to leak them. Log that we have done so. The potential for failure only exists for autotranslated guest (e.g. ARM and x86 PVH). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/privcmd.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 8e74590..569a13b 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -533,12 +533,17 @@ static void privcmd_close(struct vm_area_struct *vma)
{
struct page **pages = vma->vm_private_data;
int numpgs = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ int rc;
if (!xen_feature(XENFEAT_auto_translated_physmap) || !numpgs || !pages)
return;
- xen_unmap_domain_mfn_range(vma, numpgs, pages);
- free_xenballooned_pages(numpgs, pages);
+ rc = xen_unmap_domain_mfn_range(vma, numpgs, pages);
+ if (rc == 0)
+ free_xenballooned_pages(numpgs, pages);
+ else
+ pr_crit("unable to unmap MFN range: leaking %d pages. rc=%d\n",
+ numpgs, rc);
kfree(pages);
}
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