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authorJulien Grall <julien.grall@arm.com>2017-05-31 14:03:57 +0100
committerJuergen Gross <jgross@suse.com>2017-06-07 11:23:14 +0200
commit753c09b5652bb4fe53e2db648002ec64b32b8827 (patch)
tree9a4e906571c2f9075302d2421a54d76b9ad32282 /drivers/xen
parentc71e6d804c88168ecf02aaf14e1fd5773d683b5f (diff)
downloadlinux-753c09b5652bb4fe53e2db648002ec64b32b8827.tar.bz2
xen/privcmd: Support correctly 64KB page granularity when mapping memory
Commit 5995a68 "xen/privcmd: Add support for Linux 64KB page granularity" did not go far enough to support 64KB in mmap_batch_fn. The variable 'nr' is the number of 4KB chunk to map. However, when Linux is using 64KB page granularity the array of pages (vma->vm_private_data) contain one page per 64KB. Fix it by incrementing st->index correctly. Furthermore, st->va is not correctly incremented as PAGE_SIZE != XEN_PAGE_SIZE. Fixes: 5995a68 ("xen/privcmd: Add support for Linux 64KB page granularity") CC: stable@vger.kernel.org Reported-by: Feng Kan <fkan@apm.com> Signed-off-by: Julien Grall <julien.grall@arm.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/privcmd.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 7a92a5e1d40c..feca75b07fdd 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -362,8 +362,8 @@ static int mmap_batch_fn(void *data, int nr, void *state)
st->global_error = 1;
}
}
- st->va += PAGE_SIZE * nr;
- st->index += nr;
+ st->va += XEN_PAGE_SIZE * nr;
+ st->index += nr / XEN_PFN_PER_PAGE;
return 0;
}