1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7 #ifndef __ARM64_KVM_HYP_DEBUG_SR_H__ 8 #define __ARM64_KVM_HYP_DEBUG_SR_H__ 9 10 #include <linux/compiler.h> 11 #include <linux/kvm_host.h> 12 13 #include <asm/debug-monitors.h> 14 #include <asm/kvm_asm.h> 15 #include <asm/kvm_hyp.h> 16 #include <asm/kvm_mmu.h> 17 18 #define read_debug(r,n) read_sysreg(r##n##_el1) 19 #define write_debug(v,r,n) write_sysreg(v, r##n##_el1) 20 21 #define save_debug(ptr,reg,nr) \ 22 switch (nr) { \ 23 case 15: ptr[15] = read_debug(reg, 15); \ 24 fallthrough; \ 25 case 14: ptr[14] = read_debug(reg, 14); \ 26 fallthrough; \ 27 case 13: ptr[13] = read_debug(reg, 13); \ 28 fallthrough; \ 29 case 12: ptr[12] = read_debug(reg, 12); \ 30 fallthrough; \ 31 case 11: ptr[11] = read_debug(reg, 11); \ 32 fallthrough; \ 33 case 10: ptr[10] = read_debug(reg, 10); \ 34 fallthrough; \ 35 case 9: ptr[9] = read_debug(reg, 9); \ 36 fallthrough; \ 37 case 8: ptr[8] = read_debug(reg, 8); \ 38 fallthrough; \ 39 case 7: ptr[7] = read_debug(reg, 7); \ 40 fallthrough; \ 41 case 6: ptr[6] = read_debug(reg, 6); \ 42 fallthrough; \ 43 case 5: ptr[5] = read_debug(reg, 5); \ 44 fallthrough; \ 45 case 4: ptr[4] = read_debug(reg, 4); \ 46 fallthrough; \ 47 case 3: ptr[3] = read_debug(reg, 3); \ 48 fallthrough; \ 49 case 2: ptr[2] = read_debug(reg, 2); \ 50 fallthrough; \ 51 case 1: ptr[1] = read_debug(reg, 1); \ 52 fallthrough; \ 53 default: ptr[0] = read_debug(reg, 0); \ 54 } 55 56 #define restore_debug(ptr,reg,nr) \ 57 switch (nr) { \ 58 case 15: write_debug(ptr[15], reg, 15); \ 59 fallthrough; \ 60 case 14: write_debug(ptr[14], reg, 14); \ 61 fallthrough; \ 62 case 13: write_debug(ptr[13], reg, 13); \ 63 fallthrough; \ 64 case 12: write_debug(ptr[12], reg, 12); \ 65 fallthrough; \ 66 case 11: write_debug(ptr[11], reg, 11); \ 67 fallthrough; \ 68 case 10: write_debug(ptr[10], reg, 10); \ 69 fallthrough; \ 70 case 9: write_debug(ptr[9], reg, 9); \ 71 fallthrough; \ 72 case 8: write_debug(ptr[8], reg, 8); \ 73 fallthrough; \ 74 case 7: write_debug(ptr[7], reg, 7); \ 75 fallthrough; \ 76 case 6: write_debug(ptr[6], reg, 6); \ 77 fallthrough; \ 78 case 5: write_debug(ptr[5], reg, 5); \ 79 fallthrough; \ 80 case 4: write_debug(ptr[4], reg, 4); \ 81 fallthrough; \ 82 case 3: write_debug(ptr[3], reg, 3); \ 83 fallthrough; \ 84 case 2: write_debug(ptr[2], reg, 2); \ 85 fallthrough; \ 86 case 1: write_debug(ptr[1], reg, 1); \ 87 fallthrough; \ 88 default: write_debug(ptr[0], reg, 0); \ 89 } 90 91 static void __debug_save_state(struct kvm_guest_debug_arch *dbg, 92 struct kvm_cpu_context *ctxt) 93 { 94 u64 aa64dfr0; 95 int brps, wrps; 96 97 aa64dfr0 = read_sysreg(id_aa64dfr0_el1); 98 brps = (aa64dfr0 >> 12) & 0xf; 99 wrps = (aa64dfr0 >> 20) & 0xf; 100 101 save_debug(dbg->dbg_bcr, dbgbcr, brps); 102 save_debug(dbg->dbg_bvr, dbgbvr, brps); 103 save_debug(dbg->dbg_wcr, dbgwcr, wrps); 104 save_debug(dbg->dbg_wvr, dbgwvr, wrps); 105 106 ctxt_sys_reg(ctxt, MDCCINT_EL1) = read_sysreg(mdccint_el1); 107 } 108 109 static void __debug_restore_state(struct kvm_guest_debug_arch *dbg, 110 struct kvm_cpu_context *ctxt) 111 { 112 u64 aa64dfr0; 113 int brps, wrps; 114 115 aa64dfr0 = read_sysreg(id_aa64dfr0_el1); 116 117 brps = (aa64dfr0 >> 12) & 0xf; 118 wrps = (aa64dfr0 >> 20) & 0xf; 119 120 restore_debug(dbg->dbg_bcr, dbgbcr, brps); 121 restore_debug(dbg->dbg_bvr, dbgbvr, brps); 122 restore_debug(dbg->dbg_wcr, dbgwcr, wrps); 123 restore_debug(dbg->dbg_wvr, dbgwvr, wrps); 124 125 write_sysreg(ctxt_sys_reg(ctxt, MDCCINT_EL1), mdccint_el1); 126 } 127 128 static inline void __debug_switch_to_guest_common(struct kvm_vcpu *vcpu) 129 { 130 struct kvm_cpu_context *host_ctxt; 131 struct kvm_cpu_context *guest_ctxt; 132 struct kvm_guest_debug_arch *host_dbg; 133 struct kvm_guest_debug_arch *guest_dbg; 134 135 if (!vcpu_get_flag(vcpu, DEBUG_DIRTY)) 136 return; 137 138 host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; 139 guest_ctxt = &vcpu->arch.ctxt; 140 host_dbg = &vcpu->arch.host_debug_state.regs; 141 guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); 142 143 __debug_save_state(host_dbg, host_ctxt); 144 __debug_restore_state(guest_dbg, guest_ctxt); 145 } 146 147 static inline void __debug_switch_to_host_common(struct kvm_vcpu *vcpu) 148 { 149 struct kvm_cpu_context *host_ctxt; 150 struct kvm_cpu_context *guest_ctxt; 151 struct kvm_guest_debug_arch *host_dbg; 152 struct kvm_guest_debug_arch *guest_dbg; 153 154 if (!vcpu_get_flag(vcpu, DEBUG_DIRTY)) 155 return; 156 157 host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt; 158 guest_ctxt = &vcpu->arch.ctxt; 159 host_dbg = &vcpu->arch.host_debug_state.regs; 160 guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); 161 162 __debug_save_state(guest_dbg, guest_ctxt); 163 __debug_restore_state(host_dbg, host_ctxt); 164 165 vcpu_clear_flag(vcpu, DEBUG_DIRTY); 166 } 167 168 #endif /* __ARM64_KVM_HYP_DEBUG_SR_H__ */ 169