The commit ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d "xenbus_client: Extend interface to support multi-page ring" removes the call to free_xenballooned_pages in xenbus_unmap_ring_vfree_hvm.
This will result to not give back the pages to Linux and loose them forever. It only happens when the backends are running in HVM domains. Signed-off-by: Julien Grall <julien.gr...@citrix.com> --- Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com> Cc: Boris Ostrovsky <boris.ostrov...@oracle.com> Cc: David Vrabel <david.vra...@citrix.com> Cc: Wei Liu <wei.l...@citrix.com> Appeared in Linux 4.1. HVM backend, which is always the case on ARM, will leak every mapped ring (i.e ~12KB per domain with 1 disk and 1 vif). --- drivers/xen/xenbus/xenbus_client.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c index 9ad3272..e303535 100644 --- a/drivers/xen/xenbus/xenbus_client.c +++ b/drivers/xen/xenbus/xenbus_client.c @@ -814,8 +814,10 @@ static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr) rv = xenbus_unmap_ring(dev, node->handles, node->nr_handles, addrs); - if (!rv) + if (!rv) { vunmap(vaddr); + free_xenballooned_pages(node->nr_handles, node->hvm.pages); + } else WARN(1, "Leaking %p, size %u page(s)\n", vaddr, node->nr_handles); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/