diff options
Diffstat (limited to 'arch/arm64/kernel/bpi.S')
| -rw-r--r-- | arch/arm64/kernel/bpi.S | 67 |
1 files changed, 43 insertions, 24 deletions
diff --git a/arch/arm64/kernel/bpi.S b/arch/arm64/kernel/bpi.S index e5de33513b5d7..bb0b67722e862 100644 --- a/arch/arm64/kernel/bpi.S +++ b/arch/arm64/kernel/bpi.S @@ -19,42 +19,61 @@ #include <linux/linkage.h> #include <linux/arm-smccc.h> -.macro ventry target - .rept 31 +#include <asm/alternative.h> +#include <asm/mmu.h> + +.macro hyp_ventry + .align 7 +1: .rept 27 nop .endr - b \target +/* + * The default sequence is to directly branch to the KVM vectors, + * using the computed offset. This applies for VHE as well as + * !ARM64_HARDEN_EL2_VECTORS. + * + * For ARM64_HARDEN_EL2_VECTORS configurations, this gets replaced + * with: + * + * stp x0, x1, [sp, #-16]! + * movz x0, #(addr & 0xffff) + * movk x0, #((addr >> 16) & 0xffff), lsl #16 + * movk x0, #((addr >> 32) & 0xffff), lsl #32 + * br x0 + * + * Where addr = kern_hyp_va(__kvm_hyp_vector) + vector-offset + 4. + * See kvm_patch_vector_branch for details. + */ +alternative_cb kvm_patch_vector_branch + b __kvm_hyp_vector + (1b - 0b) + nop + nop + nop + nop +alternative_cb_end .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 +.macro generate_vectors +0: + .rept 16 + hyp_ventry + .endr + .org 0b + SZ_2K // Safety measure +.endm - ventry \target + 0x400 - ventry \target + 0x480 - ventry \target + 0x500 - ventry \target + 0x580 - ventry \target + 0x600 - ventry \target + 0x680 - ventry \target + 0x700 - ventry \target + 0x780 -.endm + .text + .pushsection .hyp.text, "ax" .align 11 ENTRY(__bp_harden_hyp_vecs_start) - .rept 4 - vectors __kvm_hyp_vector + .rept BP_HARDEN_EL2_SLOTS + generate_vectors .endr ENTRY(__bp_harden_hyp_vecs_end) + .popsection + ENTRY(__qcom_hyp_sanitize_link_stack_start) stp x29, x30, [sp, #-16]! .rept 16 |