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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2018-03-13 12:24:02 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-03-19 13:05:56 +0000 |
| commit | f0445dfadbb2ddce26f535b71578b36302805007 (patch) | |
| tree | a92117024e9c7e0da9bab042e1fe50febc4e20e3 /arch/arm64/kernel | |
| parent | arm64: KVM: Move BP hardening vectors into .hyp.text section (diff) | |
| download | linux-dev-f0445dfadbb2ddce26f535b71578b36302805007.tar.xz linux-dev-f0445dfadbb2ddce26f535b71578b36302805007.zip | |
arm64: KVM: Reserve 4 additional instructions in the BPI template
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>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/bpi.S | 39 |
1 files changed, 15 insertions, 24 deletions
diff --git a/arch/arm64/kernel/bpi.S b/arch/arm64/kernel/bpi.S index 447188e2a664..ce1cfe3b24e6 100644 --- a/arch/arm64/kernel/bpi.S +++ b/arch/arm64/kernel/bpi.S @@ -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) |