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_H__ 8 #define __ARM64_KVM_HYP_H__ 9 10 #include <linux/compiler.h> 11 #include <linux/kvm_host.h> 12 #include <asm/alternative.h> 13 #include <asm/kvm_mmu.h> 14 #include <asm/sysreg.h> 15 16 #define __hyp_text __section(.hyp.text) notrace 17 18 #define read_sysreg_elx(r,nvh,vh) \ 19 ({ \ 20 u64 reg; \ 21 asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \ 22 __mrs_s("%0", r##vh), \ 23 ARM64_HAS_VIRT_HOST_EXTN) \ 24 : "=r" (reg)); \ 25 reg; \ 26 }) 27 28 #define write_sysreg_elx(v,r,nvh,vh) \ 29 do { \ 30 u64 __val = (u64)(v); \ 31 asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \ 32 __msr_s(r##vh, "%x0"), \ 33 ARM64_HAS_VIRT_HOST_EXTN) \ 34 : : "rZ" (__val)); \ 35 } while (0) 36 37 /* 38 * Unified accessors for registers that have a different encoding 39 * between VHE and non-VHE. They must be specified without their "ELx" 40 * encoding, but with the SYS_ prefix, as defined in asm/sysreg.h. 41 */ 42 43 #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02) 44 #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02) 45 #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12) 46 #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12) 47 #define read_sysreg_el2(r) read_sysreg_elx(r, _EL2, _EL1) 48 #define write_sysreg_el2(v,r) write_sysreg_elx(v, r, _EL2, _EL1) 49 50 /** 51 * hyp_alternate_select - Generates patchable code sequences that are 52 * used to switch between two implementations of a function, depending 53 * on the availability of a feature. 54 * 55 * @fname: a symbol name that will be defined as a function returning a 56 * function pointer whose type will match @orig and @alt 57 * @orig: A pointer to the default function, as returned by @fname when 58 * @cond doesn't hold 59 * @alt: A pointer to the alternate function, as returned by @fname 60 * when @cond holds 61 * @cond: a CPU feature (as described in asm/cpufeature.h) 62 */ 63 #define hyp_alternate_select(fname, orig, alt, cond) \ 64 typeof(orig) * __hyp_text fname(void) \ 65 { \ 66 typeof(alt) *val = orig; \ 67 asm volatile(ALTERNATIVE("nop \n", \ 68 "mov %0, %1 \n", \ 69 cond) \ 70 : "+r" (val) : "r" (alt)); \ 71 return val; \ 72 } 73 74 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu); 75 76 void __vgic_v3_save_state(struct kvm_vcpu *vcpu); 77 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); 78 void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu); 79 void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu); 80 void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu); 81 void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu); 82 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu); 83 84 void __timer_enable_traps(struct kvm_vcpu *vcpu); 85 void __timer_disable_traps(struct kvm_vcpu *vcpu); 86 87 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt); 88 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt); 89 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt); 90 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt); 91 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt); 92 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt); 93 void __sysreg32_save_state(struct kvm_vcpu *vcpu); 94 void __sysreg32_restore_state(struct kvm_vcpu *vcpu); 95 96 void __debug_switch_to_guest(struct kvm_vcpu *vcpu); 97 void __debug_switch_to_host(struct kvm_vcpu *vcpu); 98 99 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs); 100 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs); 101 102 void activate_traps_vhe_load(struct kvm_vcpu *vcpu); 103 void deactivate_traps_vhe_put(void); 104 105 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt); 106 void __noreturn __hyp_do_panic(unsigned long, ...); 107 108 /* 109 * Must be called from hyp code running at EL2 with an updated VTTBR 110 * and interrupts disabled. 111 */ 112 static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm) 113 { 114 write_sysreg(kvm->arch.vtcr, vtcr_el2); 115 write_sysreg(kvm_get_vttbr(kvm), vttbr_el2); 116 117 /* 118 * ARM erratum 1165522 requires the actual execution of the above 119 * before we can switch to the EL1/EL0 translation regime used by 120 * the guest. 121 */ 122 asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_1165522)); 123 } 124 125 #endif /* __ARM64_KVM_HYP_H__ */ 126 127