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