1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Hypervisor stub 4 * 5 * Copyright (C) 2012 ARM Ltd. 6 * Author: Marc Zyngier <marc.zyngier@arm.com> 7 */ 8 9#include <linux/init.h> 10#include <linux/linkage.h> 11#include <linux/irqchip/arm-gic-v3.h> 12 13#include <asm/assembler.h> 14#include <asm/kvm_arm.h> 15#include <asm/kvm_asm.h> 16#include <asm/ptrace.h> 17#include <asm/virt.h> 18 19 .text 20 .pushsection .hyp.text, "ax" 21 22 .align 11 23 24SYM_CODE_START(__hyp_stub_vectors) 25 ventry el2_sync_invalid // Synchronous EL2t 26 ventry el2_irq_invalid // IRQ EL2t 27 ventry el2_fiq_invalid // FIQ EL2t 28 ventry el2_error_invalid // Error EL2t 29 30 ventry el2_sync_invalid // Synchronous EL2h 31 ventry el2_irq_invalid // IRQ EL2h 32 ventry el2_fiq_invalid // FIQ EL2h 33 ventry el2_error_invalid // Error EL2h 34 35 ventry el1_sync // Synchronous 64-bit EL1 36 ventry el1_irq_invalid // IRQ 64-bit EL1 37 ventry el1_fiq_invalid // FIQ 64-bit EL1 38 ventry el1_error_invalid // Error 64-bit EL1 39 40 ventry el1_sync_invalid // Synchronous 32-bit EL1 41 ventry el1_irq_invalid // IRQ 32-bit EL1 42 ventry el1_fiq_invalid // FIQ 32-bit EL1 43 ventry el1_error_invalid // Error 32-bit EL1 44SYM_CODE_END(__hyp_stub_vectors) 45 46 .align 11 47 48SYM_CODE_START_LOCAL(el1_sync) 49 cmp x0, #HVC_SET_VECTORS 50 b.ne 2f 51 msr vbar_el2, x1 52 b 9f 53 542: cmp x0, #HVC_SOFT_RESTART 55 b.ne 3f 56 mov x0, x2 57 mov x2, x4 58 mov x4, x1 59 mov x1, x3 60 br x4 // no return 61 623: cmp x0, #HVC_RESET_VECTORS 63 beq 9f // Nothing to reset! 64 65 /* Someone called kvm_call_hyp() against the hyp-stub... */ 66 mov_q x0, HVC_STUB_ERR 67 eret 68 699: mov x0, xzr 70 eret 71SYM_CODE_END(el1_sync) 72 73.macro invalid_vector label 74SYM_CODE_START_LOCAL(\label) 75 b \label 76SYM_CODE_END(\label) 77.endm 78 79 invalid_vector el2_sync_invalid 80 invalid_vector el2_irq_invalid 81 invalid_vector el2_fiq_invalid 82 invalid_vector el2_error_invalid 83 invalid_vector el1_sync_invalid 84 invalid_vector el1_irq_invalid 85 invalid_vector el1_fiq_invalid 86 invalid_vector el1_error_invalid 87 88/* 89 * __hyp_set_vectors: Call this after boot to set the initial hypervisor 90 * vectors as part of hypervisor installation. On an SMP system, this should 91 * be called on each CPU. 92 * 93 * x0 must be the physical address of the new vector table, and must be 94 * 2KB aligned. 95 * 96 * Before calling this, you must check that the stub hypervisor is installed 97 * everywhere, by waiting for any secondary CPUs to be brought up and then 98 * checking that is_hyp_mode_available() is true. 99 * 100 * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or 101 * something else went wrong... in such cases, trying to install a new 102 * hypervisor is unlikely to work as desired. 103 * 104 * When you call into your shiny new hypervisor, sp_el2 will contain junk, 105 * so you will need to set that to something sensible at the new hypervisor's 106 * initialisation entry point. 107 */ 108 109SYM_FUNC_START(__hyp_set_vectors) 110 mov x1, x0 111 mov x0, #HVC_SET_VECTORS 112 hvc #0 113 ret 114SYM_FUNC_END(__hyp_set_vectors) 115 116SYM_FUNC_START(__hyp_reset_vectors) 117 mov x0, #HVC_RESET_VECTORS 118 hvc #0 119 ret 120SYM_FUNC_END(__hyp_reset_vectors) 121