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 #ifndef __ARM64_KVM_HYP_H__ 19 #define __ARM64_KVM_HYP_H__ 20 21 #include <linux/compiler.h> 22 #include <linux/kvm_host.h> 23 #include <asm/alternative.h> 24 #include <asm/kvm_mmu.h> 25 #include <asm/sysreg.h> 26 27 #define __hyp_text __section(.hyp.text) notrace 28 29 #define read_sysreg_elx(r,nvh,vh) \ 30 ({ \ 31 u64 reg; \ 32 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\ 33 "mrs_s %0, " __stringify(r##vh),\ 34 ARM64_HAS_VIRT_HOST_EXTN) \ 35 : "=r" (reg)); \ 36 reg; \ 37 }) 38 39 #define write_sysreg_elx(v,r,nvh,vh) \ 40 do { \ 41 u64 __val = (u64)(v); \ 42 asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\ 43 "msr_s " __stringify(r##vh) ", %x0",\ 44 ARM64_HAS_VIRT_HOST_EXTN) \ 45 : : "rZ" (__val)); \ 46 } while (0) 47 48 /* 49 * Unified accessors for registers that have a different encoding 50 * between VHE and non-VHE. They must be specified without their "ELx" 51 * encoding. 52 */ 53 #define read_sysreg_el2(r) \ 54 ({ \ 55 u64 reg; \ 56 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\ 57 "mrs %0, " __stringify(r##_EL1),\ 58 ARM64_HAS_VIRT_HOST_EXTN) \ 59 : "=r" (reg)); \ 60 reg; \ 61 }) 62 63 #define write_sysreg_el2(v,r) \ 64 do { \ 65 u64 __val = (u64)(v); \ 66 asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\ 67 "msr " __stringify(r##_EL1) ", %x0",\ 68 ARM64_HAS_VIRT_HOST_EXTN) \ 69 : : "rZ" (__val)); \ 70 } while (0) 71 72 #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02) 73 #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02) 74 #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12) 75 #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12) 76 77 /* The VHE specific system registers and their encoding */ 78 #define sctlr_EL12 sys_reg(3, 5, 1, 0, 0) 79 #define cpacr_EL12 sys_reg(3, 5, 1, 0, 2) 80 #define ttbr0_EL12 sys_reg(3, 5, 2, 0, 0) 81 #define ttbr1_EL12 sys_reg(3, 5, 2, 0, 1) 82 #define tcr_EL12 sys_reg(3, 5, 2, 0, 2) 83 #define afsr0_EL12 sys_reg(3, 5, 5, 1, 0) 84 #define afsr1_EL12 sys_reg(3, 5, 5, 1, 1) 85 #define esr_EL12 sys_reg(3, 5, 5, 2, 0) 86 #define far_EL12 sys_reg(3, 5, 6, 0, 0) 87 #define mair_EL12 sys_reg(3, 5, 10, 2, 0) 88 #define amair_EL12 sys_reg(3, 5, 10, 3, 0) 89 #define vbar_EL12 sys_reg(3, 5, 12, 0, 0) 90 #define contextidr_EL12 sys_reg(3, 5, 13, 0, 1) 91 #define cntkctl_EL12 sys_reg(3, 5, 14, 1, 0) 92 #define cntp_tval_EL02 sys_reg(3, 5, 14, 2, 0) 93 #define cntp_ctl_EL02 sys_reg(3, 5, 14, 2, 1) 94 #define cntp_cval_EL02 sys_reg(3, 5, 14, 2, 2) 95 #define cntv_tval_EL02 sys_reg(3, 5, 14, 3, 0) 96 #define cntv_ctl_EL02 sys_reg(3, 5, 14, 3, 1) 97 #define cntv_cval_EL02 sys_reg(3, 5, 14, 3, 2) 98 #define spsr_EL12 sys_reg(3, 5, 4, 0, 0) 99 #define elr_EL12 sys_reg(3, 5, 4, 0, 1) 100 101 /** 102 * hyp_alternate_select - Generates patchable code sequences that are 103 * used to switch between two implementations of a function, depending 104 * on the availability of a feature. 105 * 106 * @fname: a symbol name that will be defined as a function returning a 107 * function pointer whose type will match @orig and @alt 108 * @orig: A pointer to the default function, as returned by @fname when 109 * @cond doesn't hold 110 * @alt: A pointer to the alternate function, as returned by @fname 111 * when @cond holds 112 * @cond: a CPU feature (as described in asm/cpufeature.h) 113 */ 114 #define hyp_alternate_select(fname, orig, alt, cond) \ 115 typeof(orig) * __hyp_text fname(void) \ 116 { \ 117 typeof(alt) *val = orig; \ 118 asm volatile(ALTERNATIVE("nop \n", \ 119 "mov %0, %1 \n", \ 120 cond) \ 121 : "+r" (val) : "r" (alt)); \ 122 return val; \ 123 } 124 125 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu); 126 127 void __vgic_v3_save_state(struct kvm_vcpu *vcpu); 128 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); 129 void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu); 130 void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu); 131 void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu); 132 void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu); 133 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu); 134 135 void __timer_enable_traps(struct kvm_vcpu *vcpu); 136 void __timer_disable_traps(struct kvm_vcpu *vcpu); 137 138 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt); 139 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt); 140 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt); 141 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt); 142 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt); 143 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt); 144 void __sysreg32_save_state(struct kvm_vcpu *vcpu); 145 void __sysreg32_restore_state(struct kvm_vcpu *vcpu); 146 147 void __debug_switch_to_guest(struct kvm_vcpu *vcpu); 148 void __debug_switch_to_host(struct kvm_vcpu *vcpu); 149 150 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs); 151 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs); 152 bool __fpsimd_enabled(void); 153 154 void activate_traps_vhe_load(struct kvm_vcpu *vcpu); 155 void deactivate_traps_vhe_put(void); 156 157 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt); 158 void __noreturn __hyp_do_panic(unsigned long, ...); 159 160 /* 161 * Must be called from hyp code running at EL2 with an updated VTTBR 162 * and interrupts disabled. 163 */ 164 static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm) 165 { 166 write_sysreg(kvm->arch.vtcr, vtcr_el2); 167 write_sysreg(kvm_get_vttbr(kvm), vttbr_el2); 168 169 /* 170 * ARM erratum 1165522 requires the actual execution of the above 171 * before we can switch to the EL1/EL0 translation regime used by 172 * the guest. 173 */ 174 asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_1165522)); 175 } 176 177 #endif /* __ARM64_KVM_HYP_H__ */ 178 179