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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2015 - ARM Ltd * Author: Marc Zyngier <marc.zyngier@arm.com> */ #include <linux/compiler.h> #include <linux/kvm_host.h> #include <asm/debug-monitors.h> #include <asm/kvm_asm.h> #include <asm/kvm_hyp.h> #include <asm/kvm_mmu.h> #define read_debug(r,n) read_sysreg(r##n##_el1) #define write_debug(v,r,n) write_sysreg(v, r##n##_el1) #define save_debug(ptr,reg,nr) \ switch (nr) { \ case 15: ptr[15] = read_debug(reg, 15); \ /* Fall through */ \ case 14: ptr[14] = read_debug(reg, 14); \ /* Fall through */ \ case 13: ptr[13] = read_debug(reg, 13); \ /* Fall through */ \ case 12: ptr[12] = read_debug(reg, 12); \ /* Fall through */ \ case 11: ptr[11] = read_debug(reg, 11); \ /* Fall through */ \ case 10: ptr[10] = read_debug(reg, 10); \ /* Fall through */ \ case 9: ptr[9] = read_debug(reg, 9); \ /* Fall through */ \ case 8: ptr[8] = read_debug(reg, 8); \ /* Fall through */ \ case 7: ptr[7] = read_debug(reg, 7); \ /* Fall through */ \ case 6: ptr[6] = read_debug(reg, 6); \ /* Fall through */ \ case 5: ptr[5] = read_debug(reg, 5); \ /* Fall through */ \ case 4: ptr[4] = read_debug(reg, 4); \ /* Fall through */ \ case 3: ptr[3] = read_debug(reg, 3); \ /* Fall through */ \ case 2: ptr[2] = read_debug(reg, 2); \ /* Fall through */ \ case 1: ptr[1] = read_debug(reg, 1); \ /* Fall through */ \ default: ptr[0] = read_debug(reg, 0); \ } #define restore_debug(ptr,reg,nr) \ switch (nr) { \ case 15: write_debug(ptr[15], reg, 15); \ /* Fall through */ \ case 14: write_debug(ptr[14], reg, 14); \ /* Fall through */ \ case 13: write_debug(ptr[13], reg, 13); \ /* Fall through */ \ case 12: write_debug(ptr[12], reg, 12); \ /* Fall through */ \ case 11: write_debug(ptr[11], reg, 11); \ /* Fall through */ \ case 10: write_debug(ptr[10], reg, 10); \ /* Fall through */ \ case 9: write_debug(ptr[9], reg, 9); \ /* Fall through */ \ case 8: write_debug(ptr[8], reg, 8); \ /* Fall through */ \ case 7: write_debug(ptr[7], reg, 7); \ /* Fall through */ \ case 6: write_debug(ptr[6], reg, 6); \ /* Fall through */ \ case 5: write_debug(ptr[5], reg, 5); \ /* Fall through */ \ case 4: write_debug(ptr[4], reg, 4); \ /* Fall through */ \ case 3: write_debug(ptr[3], reg, 3); \ /* Fall through */ \ case 2: write_debug(ptr[2], reg, 2); \ /* Fall through */ \ case 1: write_debug(ptr[1], reg, 1); \ /* Fall through */ \ default: write_debug(ptr[0], reg, 0); \ } static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1) { u64 reg; /* Clear pmscr in case of early return */ *pmscr_el1 = 0; /* SPE present on this CPU? */ if (!cpuid_feature_extract_unsigned_field(read_sysreg(id_aa64dfr0_el1), ID_AA64DFR0_PMSVER_SHIFT)) return; /* Yes; is it owned by EL3? */ reg = read_sysreg_s(SYS_PMBIDR_EL1); if (reg & BIT(SYS_PMBIDR_EL1_P_SHIFT)) return; /* No; is the host actually using the thing? */ reg = read_sysreg_s(SYS_PMBLIMITR_EL1); if (!(reg & BIT(SYS_PMBLIMITR_EL1_E_SHIFT))) return; /* Yes; save the control register and disable data generation */ *pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1); write_sysreg_s(0, SYS_PMSCR_EL1); isb(); /* Now drain all buffered data to memory */ psb_csync(); dsb(nsh); } static void __hyp_text __debug_restore_spe_nvhe(u64 pmscr_el1) { if (!pmscr_el1) return; /* The host page table is installed, but not yet synchronised */ isb(); /* Re-enable data generation */ write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1); } static void __hyp_text __debug_save_state(struct kvm_vcpu *vcpu, struct kvm_guest_debug_arch *dbg, struct kvm_cpu_context *ctxt) { u64 aa64dfr0; int brps, wrps; aa64dfr0 = read_sysreg(id_aa64dfr0_el1); brps = (aa64dfr0 >> 12) & 0xf; wrps = (aa64dfr0 >> 20) & 0xf; save_debug(dbg->dbg_bcr, dbgbcr, brps); save_debug(dbg->dbg_bvr, dbgbvr, brps); save_debug(dbg->dbg_wcr, dbgwcr, wrps); save_debug(dbg->dbg_wvr, dbgwvr, wrps); ctxt->sys_regs[MDCCINT_EL1] = read_sysreg(mdccint_el1); } static void __hyp_text __debug_restore_state(struct kvm_vcpu *vcpu, struct kvm_guest_debug_arch *dbg, struct kvm_cpu_context *ctxt) { u64 aa64dfr0; int brps, wrps; aa64dfr0 = read_sysreg(id_aa64dfr0_el1); brps = (aa64dfr0 >> 12) & 0xf; wrps = (aa64dfr0 >> 20) & 0xf; restore_debug(dbg->dbg_bcr, dbgbcr, brps); restore_debug(dbg->dbg_bvr, dbgbvr, brps); restore_debug(dbg->dbg_wcr, dbgwcr, wrps); restore_debug(dbg->dbg_wvr, dbgwvr, wrps); write_sysreg(ctxt->sys_regs[MDCCINT_EL1], mdccint_el1); } void __hyp_text __debug_switch_to_guest(struct kvm_vcpu *vcpu) { struct kvm_cpu_context *host_ctxt; struct kvm_cpu_context *guest_ctxt; struct kvm_guest_debug_arch *host_dbg; struct kvm_guest_debug_arch *guest_dbg; /* * Non-VHE: Disable and flush SPE data generation * VHE: The vcpu can run, but it can't hide. */ if (!has_vhe()) __debug_save_spe_nvhe(&vcpu->arch.host_debug_state.pmscr_el1); if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)) return; host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); guest_ctxt = &vcpu->arch.ctxt; host_dbg = &vcpu->arch.host_debug_state.regs; guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); __debug_save_state(vcpu, host_dbg, host_ctxt); __debug_restore_state(vcpu, guest_dbg, guest_ctxt); } void __hyp_text __debug_switch_to_host(struct kvm_vcpu *vcpu) { struct kvm_cpu_context *host_ctxt; struct kvm_cpu_context *guest_ctxt; struct kvm_guest_debug_arch *host_dbg; struct kvm_guest_debug_arch *guest_dbg; if (!has_vhe()) __debug_restore_spe_nvhe(vcpu->arch.host_debug_state.pmscr_el1); if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)) return; host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); guest_ctxt = &vcpu->arch.ctxt; host_dbg = &vcpu->arch.host_debug_state.regs; guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); __debug_save_state(vcpu, guest_dbg, guest_ctxt); __debug_restore_state(vcpu, host_dbg, host_ctxt); vcpu->arch.flags &= ~KVM_ARM64_DEBUG_DIRTY; } u32 __hyp_text __kvm_get_mdcr_el2(void) { return read_sysreg(mdcr_el2); } |