1/* 2 * Copyright (C) 2015 - ARM Ltd 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18#include <linux/linkage.h> 19 20#include <asm/alternative.h> 21#include <asm/assembler.h> 22#include <asm/cpufeature.h> 23#include <asm/kvm_arm.h> 24#include <asm/kvm_asm.h> 25#include <asm/kvm_mmu.h> 26 27 .text 28 .pushsection .hyp.text, "ax" 29 30.macro save_x0_to_x3 31 stp x0, x1, [sp, #-16]! 32 stp x2, x3, [sp, #-16]! 33.endm 34 35.macro restore_x0_to_x3 36 ldp x2, x3, [sp], #16 37 ldp x0, x1, [sp], #16 38.endm 39 40.macro do_el2_call 41 /* 42 * Shuffle the parameters before calling the function 43 * pointed to in x0. Assumes parameters in x[1,2,3]. 44 */ 45 mov lr, x0 46 mov x0, x1 47 mov x1, x2 48 mov x2, x3 49 blr lr 50.endm 51 52ENTRY(__vhe_hyp_call) 53 str lr, [sp, #-16]! 54 do_el2_call 55 ldr lr, [sp], #16 56 /* 57 * We used to rely on having an exception return to get 58 * an implicit isb. In the E2H case, we don't have it anymore. 59 * rather than changing all the leaf functions, just do it here 60 * before returning to the rest of the kernel. 61 */ 62 isb 63 ret 64ENDPROC(__vhe_hyp_call) 65 66/* 67 * Compute the idmap address of __kvm_hyp_reset based on the idmap 68 * start passed as a parameter, and jump there. 69 * 70 * x0: HYP phys_idmap_start 71 */ 72ENTRY(__kvm_hyp_teardown) 73 mov x4, x0 74 adr_l x3, __kvm_hyp_reset 75 76 /* insert __kvm_hyp_reset()s offset into phys_idmap_start */ 77 bfi x4, x3, #0, #PAGE_SHIFT 78 br x4 79ENDPROC(__kvm_hyp_teardown) 80 81el1_sync: // Guest trapped into EL2 82 save_x0_to_x3 83 84alternative_if_not ARM64_HAS_VIRT_HOST_EXTN 85 mrs x1, esr_el2 86alternative_else 87 mrs x1, esr_el1 88alternative_endif 89 lsr x2, x1, #ESR_ELx_EC_SHIFT 90 91 cmp x2, #ESR_ELx_EC_HVC64 92 b.ne el1_trap 93 94 mrs x3, vttbr_el2 // If vttbr is valid, the 64bit guest 95 cbnz x3, el1_trap // called HVC 96 97 /* Here, we're pretty sure the host called HVC. */ 98 restore_x0_to_x3 99 100 cmp x0, #HVC_GET_VECTORS 101 b.ne 1f 102 mrs x0, vbar_el2 103 b 2f 104 1051: 106 /* 107 * Perform the EL2 call 108 */ 109 kern_hyp_va x0 110 do_el2_call 111 1122: eret 113 114el1_trap: 115 /* 116 * x1: ESR 117 * x2: ESR_EC 118 */ 119 120 /* Guest accessed VFP/SIMD registers, save host, restore Guest */ 121 cmp x2, #ESR_ELx_EC_FP_ASIMD 122 b.eq __fpsimd_guest_restore 123 124 mrs x0, tpidr_el2 125 mov x1, #ARM_EXCEPTION_TRAP 126 b __guest_exit 127 128el1_irq: 129 save_x0_to_x3 130 mrs x0, tpidr_el2 131 mov x1, #ARM_EXCEPTION_IRQ 132 b __guest_exit 133 134ENTRY(__hyp_do_panic) 135 mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ 136 PSR_MODE_EL1h) 137 msr spsr_el2, lr 138 ldr lr, =panic 139 msr elr_el2, lr 140 eret 141ENDPROC(__hyp_do_panic) 142 143.macro invalid_vector label, target = __hyp_panic 144 .align 2 145\label: 146 b \target 147ENDPROC(\label) 148.endm 149 150 /* None of these should ever happen */ 151 invalid_vector el2t_sync_invalid 152 invalid_vector el2t_irq_invalid 153 invalid_vector el2t_fiq_invalid 154 invalid_vector el2t_error_invalid 155 invalid_vector el2h_sync_invalid 156 invalid_vector el2h_irq_invalid 157 invalid_vector el2h_fiq_invalid 158 invalid_vector el2h_error_invalid 159 invalid_vector el1_sync_invalid 160 invalid_vector el1_irq_invalid 161 invalid_vector el1_fiq_invalid 162 invalid_vector el1_error_invalid 163 164 .ltorg 165 166 .align 11 167 168ENTRY(__kvm_hyp_vector) 169 ventry el2t_sync_invalid // Synchronous EL2t 170 ventry el2t_irq_invalid // IRQ EL2t 171 ventry el2t_fiq_invalid // FIQ EL2t 172 ventry el2t_error_invalid // Error EL2t 173 174 ventry el2h_sync_invalid // Synchronous EL2h 175 ventry el2h_irq_invalid // IRQ EL2h 176 ventry el2h_fiq_invalid // FIQ EL2h 177 ventry el2h_error_invalid // Error EL2h 178 179 ventry el1_sync // Synchronous 64-bit EL1 180 ventry el1_irq // IRQ 64-bit EL1 181 ventry el1_fiq_invalid // FIQ 64-bit EL1 182 ventry el1_error_invalid // Error 64-bit EL1 183 184 ventry el1_sync // Synchronous 32-bit EL1 185 ventry el1_irq // IRQ 32-bit EL1 186 ventry el1_fiq_invalid // FIQ 32-bit EL1 187 ventry el1_error_invalid // Error 32-bit EL1 188ENDPROC(__kvm_hyp_vector) 189