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Commit 0394e1f6 authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall
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ARM: KVM: enforce maximum size for identity mapped code 



We're about to move to an init procedure where we rely on the
fact that the init code fits in a single page. Make sure we
align the idmap text on a vector alignment, and that the code is
not bigger than a single page.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <cdall@cs.columbia.edu>
parent 2fb41059

arch/arm/kernel/vmlinux.lds.S

+6 −1
Original line number Diff line number Diff line
@@ -20,7 +20,7 @@ 
	VMLINUX_SYMBOL(__idmap_text_start) = .;				\

	*(.idmap.text)							\

	VMLINUX_SYMBOL(__idmap_text_end) = .;				\

	ALIGN_FUNCTION();						\

	. = ALIGN(32);							\

	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;			\

	*(.hyp.idmap.text)						\

	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
@@ -315,3 +315,8 @@ SECTIONS 
 */

ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")

ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")

/*

 * The HYP init code can't be more than a page long.

 * The above comment applies as well.

 */

ASSERT(((__hyp_idmap_text_end - __hyp_idmap_text_start) <= PAGE_SIZE), "HYP init code too big")