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/kvm_mmu.h> 24 #include <asm/kvm_perf_event.h> 25 #include <asm/sysreg.h> 26 27 #define __hyp_text __section(.hyp.text) notrace 28 29 static inline unsigned long __kern_hyp_va(unsigned long v) 30 { 31 asm volatile(ALTERNATIVE("and %0, %0, %1", 32 "nop", 33 ARM64_HAS_VIRT_HOST_EXTN) 34 : "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK)); 35 return v; 36 } 37 38 #define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v))) 39 40 static inline unsigned long __hyp_kern_va(unsigned long v) 41 { 42 u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET; 43 asm volatile(ALTERNATIVE("add %0, %0, %1", 44 "nop", 45 ARM64_HAS_VIRT_HOST_EXTN) 46 : "+r" (v) : "r" (offset)); 47 return v; 48 } 49 50 #define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v))) 51 52 #define read_sysreg_elx(r,nvh,vh) \ 53 ({ \ 54 u64 reg; \ 55 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\ 56 "mrs_s %0, " __stringify(r##vh),\ 57 ARM64_HAS_VIRT_HOST_EXTN) \ 58 : "=r" (reg)); \ 59 reg; \ 60 }) 61 62 #define write_sysreg_elx(v,r,nvh,vh) \ 63 do { \ 64 u64 __val = (u64)(v); \ 65 asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\ 66 "msr_s " __stringify(r##vh) ", %x0",\ 67 ARM64_HAS_VIRT_HOST_EXTN) \ 68 : : "rZ" (__val)); \ 69 } while (0) 70 71 /* 72 * Unified accessors for registers that have a different encoding 73 * between VHE and non-VHE. They must be specified without their "ELx" 74 * encoding. 75 */ 76 #define read_sysreg_el2(r) \ 77 ({ \ 78 u64 reg; \ 79 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\ 80 "mrs %0, " __stringify(r##_EL1),\ 81 ARM64_HAS_VIRT_HOST_EXTN) \ 82 : "=r" (reg)); \ 83 reg; \ 84 }) 85 86 #define write_sysreg_el2(v,r) \ 87 do { \ 88 u64 __val = (u64)(v); \ 89 asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\ 90 "msr " __stringify(r##_EL1) ", %x0",\ 91 ARM64_HAS_VIRT_HOST_EXTN) \ 92 : : "rZ" (__val)); \ 93 } while (0) 94 95 #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02) 96 #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02) 97 #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12) 98 #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12) 99 100 /* The VHE specific system registers and their encoding */ 101 #define sctlr_EL12 sys_reg(3, 5, 1, 0, 0) 102 #define cpacr_EL12 sys_reg(3, 5, 1, 0, 2) 103 #define ttbr0_EL12 sys_reg(3, 5, 2, 0, 0) 104 #define ttbr1_EL12 sys_reg(3, 5, 2, 0, 1) 105 #define tcr_EL12 sys_reg(3, 5, 2, 0, 2) 106 #define afsr0_EL12 sys_reg(3, 5, 5, 1, 0) 107 #define afsr1_EL12 sys_reg(3, 5, 5, 1, 1) 108 #define esr_EL12 sys_reg(3, 5, 5, 2, 0) 109 #define far_EL12 sys_reg(3, 5, 6, 0, 0) 110 #define mair_EL12 sys_reg(3, 5, 10, 2, 0) 111 #define amair_EL12 sys_reg(3, 5, 10, 3, 0) 112 #define vbar_EL12 sys_reg(3, 5, 12, 0, 0) 113 #define contextidr_EL12 sys_reg(3, 5, 13, 0, 1) 114 #define cntkctl_EL12 sys_reg(3, 5, 14, 1, 0) 115 #define cntp_tval_EL02 sys_reg(3, 5, 14, 2, 0) 116 #define cntp_ctl_EL02 sys_reg(3, 5, 14, 2, 1) 117 #define cntp_cval_EL02 sys_reg(3, 5, 14, 2, 2) 118 #define cntv_tval_EL02 sys_reg(3, 5, 14, 3, 0) 119 #define cntv_ctl_EL02 sys_reg(3, 5, 14, 3, 1) 120 #define cntv_cval_EL02 sys_reg(3, 5, 14, 3, 2) 121 #define spsr_EL12 sys_reg(3, 5, 4, 0, 0) 122 #define elr_EL12 sys_reg(3, 5, 4, 0, 1) 123 124 /** 125 * hyp_alternate_select - Generates patchable code sequences that are 126 * used to switch between two implementations of a function, depending 127 * on the availability of a feature. 128 * 129 * @fname: a symbol name that will be defined as a function returning a 130 * function pointer whose type will match @orig and @alt 131 * @orig: A pointer to the default function, as returned by @fname when 132 * @cond doesn't hold 133 * @alt: A pointer to the alternate function, as returned by @fname 134 * when @cond holds 135 * @cond: a CPU feature (as described in asm/cpufeature.h) 136 */ 137 #define hyp_alternate_select(fname, orig, alt, cond) \ 138 typeof(orig) * __hyp_text fname(void) \ 139 { \ 140 typeof(alt) *val = orig; \ 141 asm volatile(ALTERNATIVE("nop \n", \ 142 "mov %0, %1 \n", \ 143 cond) \ 144 : "+r" (val) : "r" (alt)); \ 145 return val; \ 146 } 147 148 void __vgic_v2_save_state(struct kvm_vcpu *vcpu); 149 void __vgic_v2_restore_state(struct kvm_vcpu *vcpu); 150 151 void __vgic_v3_save_state(struct kvm_vcpu *vcpu); 152 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); 153 154 void __timer_save_state(struct kvm_vcpu *vcpu); 155 void __timer_restore_state(struct kvm_vcpu *vcpu); 156 157 void __sysreg_save_host_state(struct kvm_cpu_context *ctxt); 158 void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt); 159 void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt); 160 void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt); 161 void __sysreg32_save_state(struct kvm_vcpu *vcpu); 162 void __sysreg32_restore_state(struct kvm_vcpu *vcpu); 163 164 void __debug_save_state(struct kvm_vcpu *vcpu, 165 struct kvm_guest_debug_arch *dbg, 166 struct kvm_cpu_context *ctxt); 167 void __debug_restore_state(struct kvm_vcpu *vcpu, 168 struct kvm_guest_debug_arch *dbg, 169 struct kvm_cpu_context *ctxt); 170 void __debug_cond_save_host_state(struct kvm_vcpu *vcpu); 171 void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu); 172 173 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs); 174 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs); 175 bool __fpsimd_enabled(void); 176 177 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt); 178 void __noreturn __hyp_do_panic(unsigned long, ...); 179 180 #endif /* __ARM64_KVM_HYP_H__ */ 181 182