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Commit 33df4db0 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar
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x86: xen, i386: reserve Xen pagetables 



The Xen pagetables are no longer implicitly reserved as part of the other
i386_start_kernel reservations, so make sure we explicitly reserve them.
This prevents them from being released into the general kernel free page
pool and reused.

[ Impact: fix Xen guest crash ]

Also-Bisected-by: default avatarBryan Donlan <bdonlan@gmail.com>
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Xen-devel <xen-devel@lists.xensource.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <4A032EEC.30509@goop.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6407df5c

arch/x86/xen/mmu.c

+5 −0
Original line number Diff line number Diff line
@@ -1794,6 +1794,11 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, 


	pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir)));



	reserve_early(__pa(xen_start_info->pt_base),

		      __pa(xen_start_info->pt_base +

			   xen_start_info->nr_pt_frames * PAGE_SIZE),

		      "XEN PAGETABLES");



	return swapper_pg_dir;

}

#endif	/* CONFIG_X86_64 */