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H A Dpvcalls-front.cdiff b0576cc9c6b843d99c6982888d59a56209341888 Mon Mar 07 02:48:55 CST 2022 Juergen Gross <jgross@suse.com> xen/pvcalls: use alloc/free_pages_exact()

Instead of __get_free_pages() and free_pages() use alloc_pages_exact()
and free_pages_exact(). This is in preparation of a change of
gnttab_end_foreign_access() which will prohibit use of high-order
pages.

This is part of CVE-2022-23041 / XSA-396.

Reported-by: Simon Gaiser <simon@invisiblethingslab.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
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V4:
- new patch