From: Marc Zyngier Date: Fri, 12 Apr 2013 18:12:04 +0000 (+0100) Subject: ARM: KVM: enforce maximum size for identity mapped code X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0394e1f605208706e4e1999d06a4570b9f583b7f;p=linux-beck.git 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: Marc Zyngier Signed-off-by: Christoffer Dall --- diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index b571484e9f03..a871b8e00fca 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -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")