xen/PVH: Set up GS segment for stack canary
We are making calls to C code (e.g. xen_prepare_pvh()) which may use stack canary (stored in GS segment). Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Signed-off-by: NJuergen Gross <jgross@suse.com>
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