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arm64: KVM: Reserve 4 additional instructions in the BPI template

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So far, we only reserve a single instruction in the BPI template in
order to branch to the vectors. As we're going to stuff a few more
instructions there, let's reserve a total of 5 instructions, which
we're going to patch later on as required.

We also introduce a small refactor of the vectors themselves, so that
we stop carrying the target branch around.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2018-03-13 12:24:02 +00:00
parent 4340ba80bd
commit f0445dfadb
1 changed files with 15 additions and 24 deletions
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39
arch/arm64/kernel/bpi.S
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@ -19,33 +19,24 @@
#include <linux/linkage.h>
#include <linux/arm-smccc.h>
.macro ventry target
.rept 31
.macro hyp_ventry
.align 7
1: .rept 27
nop
.endr
b \target
b __kvm_hyp_vector + (1b - 0b)
nop
nop
nop
nop
.endm
.macro vectors target
ventry \target + 0x000
ventry \target + 0x080
ventry \target + 0x100
ventry \target + 0x180
ventry \target + 0x200
ventry \target + 0x280
ventry \target + 0x300
ventry \target + 0x380
ventry \target + 0x400
ventry \target + 0x480
ventry \target + 0x500
ventry \target + 0x580
ventry \target + 0x600
ventry \target + 0x680
ventry \target + 0x700
ventry \target + 0x780
.macro generate_vectors
0:
.rept 16
hyp_ventry
.endr
.org 0b + SZ_2K // Safety measure
.endm
@ -55,7 +46,7 @@
.align 11
ENTRY(__bp_harden_hyp_vecs_start)
.rept 4
vectors __kvm_hyp_vector
generate_vectors
.endr
ENTRY(__bp_harden_hyp_vecs_end)