diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/hyp-entry.S')
| -rw-r--r-- | arch/arm64/kvm/hyp/hyp-entry.S | 71 |
1 files changed, 40 insertions, 31 deletions
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index 0a5b36eb54b3..d179056e1af8 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -13,6 +13,7 @@ #include <asm/kvm_arm.h> #include <asm/kvm_asm.h> #include <asm/mmu.h> +#include <asm/spectre.h> .macro save_caller_saved_regs_vect /* x0 and x1 were saved in the vector entry */ @@ -187,52 +188,60 @@ SYM_CODE_START(__kvm_hyp_vector) valid_vect el1_error // Error 32-bit EL1 SYM_CODE_END(__kvm_hyp_vector) -.macro hyp_ventry - .align 7 +.macro spectrev2_smccc_wa1_smc + sub sp, sp, #(8 * 4) + stp x2, x3, [sp, #(8 * 0)] + stp x0, x1, [sp, #(8 * 2)] + mov w0, #ARM_SMCCC_ARCH_WORKAROUND_1 + smc #0 + ldp x2, x3, [sp, #(8 * 0)] + add sp, sp, #(8 * 2) +.endm + +.macro hyp_ventry indirect, spectrev2 + .align 7 1: esb - .rept 26 - nop - .endr -/* - * 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. The first vector must always run the preamble. - * - * 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 + KVM_VECTOR_PREAMBLE. - * See kvm_patch_vector_branch for details. - */ -alternative_cb kvm_patch_vector_branch + .if \spectrev2 != 0 + spectrev2_smccc_wa1_smc + .else stp x0, x1, [sp, #-16]! - b __kvm_hyp_vector + (1b - 0b + KVM_VECTOR_PREAMBLE) + .endif + .if \indirect != 0 + alternative_cb kvm_patch_vector_branch + /* + * For ARM64_SPECTRE_V3A configurations, these NOPs get replaced with: + * + * 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 + KVM_VECTOR_PREAMBLE. + * See kvm_patch_vector_branch for details. + */ nop nop nop -alternative_cb_end + nop + alternative_cb_end + .endif + b __kvm_hyp_vector + (1b - 0b + KVM_VECTOR_PREAMBLE) .endm -.macro generate_vectors +.macro generate_vectors indirect, spectrev2 0: .rept 16 - hyp_ventry + hyp_ventry \indirect, \spectrev2 .endr .org 0b + SZ_2K // Safety measure .endm .align 11 SYM_CODE_START(__bp_harden_hyp_vecs) - .rept BP_HARDEN_EL2_SLOTS - generate_vectors - .endr + generate_vectors indirect = 0, spectrev2 = 1 // HYP_VECTOR_SPECTRE_DIRECT + generate_vectors indirect = 1, spectrev2 = 0 // HYP_VECTOR_INDIRECT + generate_vectors indirect = 1, spectrev2 = 1 // HYP_VECTOR_SPECTRE_INDIRECT 1: .org __bp_harden_hyp_vecs + __BP_HARDEN_HYP_VECS_SZ .org 1b SYM_CODE_END(__bp_harden_hyp_vecs) |