x86/xen: create stubs for HVM-only builds in page.h
__pfn_to_mfn() is only used from PV code (mmu_pv.c, p2m.c) and from page.h where all functions calling it check for xen_feature(XENFEAT_auto_translated_physmap) first so we can replace it with any stub to make build happy. set_foreign_p2m_mapping()/clear_foreign_p2m_mapping() are used from grant-table.c but only if !xen_feature(XENFEAT_auto_translated_physmap). Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com>
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