arch/arm64/include/asm/kvm_hyp.h

   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/sysreg.h>
  14
  15 DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
  16 DECLARE_PER_CPU(unsigned long, kvm_hyp_vector);
  17 DECLARE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
  18
  19 /*
  20  * Unified accessors for registers that have a different encoding
  21  * between VHE and non-VHE. They must be specified without their "ELx"
  22  * encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
  23  */
  24
  25 #if defined(__KVM_VHE_HYPERVISOR__)
  26
  27 #define read_sysreg_el0(r)      read_sysreg_s(r##_EL02)
  28 #define write_sysreg_el0(v,r)   write_sysreg_s(v, r##_EL02)
  29 #define read_sysreg_el1(r)      read_sysreg_s(r##_EL12)
  30 #define write_sysreg_el1(v,r)   write_sysreg_s(v, r##_EL12)
  31 #define read_sysreg_el2(r)      read_sysreg_s(r##_EL1)
  32 #define write_sysreg_el2(v,r)   write_sysreg_s(v, r##_EL1)
  33
  34 #else // !__KVM_VHE_HYPERVISOR__
  35
  36 #if defined(__KVM_NVHE_HYPERVISOR__)
  37 #define VHE_ALT_KEY     ARM64_KVM_HVHE
  38 #else
  39 #define VHE_ALT_KEY     ARM64_HAS_VIRT_HOST_EXTN
  40 #endif
  41
  42 #define read_sysreg_elx(r,nvh,vh)                                       \
  43         ({                                                              \
  44                 u64 reg;                                                \
  45                 asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh),         \
  46                                          __mrs_s("%0", r##vh),          \
  47                                          VHE_ALT_KEY)                   \
  48                              : "=r" (reg));                             \
  49                 reg;                                                    \
  50         })
  51
  52 #define write_sysreg_elx(v,r,nvh,vh)                                    \
  53         do {                                                            \
  54                 u64 __val = (u64)(v);                                   \
  55                 asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"),        \
  56                                          __msr_s(r##vh, "%x0"),         \
  57                                          VHE_ALT_KEY)                   \
  58                                          : : "rZ" (__val));             \
  59         } while (0)
  60
  61 #define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  62 #define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  63 #define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  64 #define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  65 #define read_sysreg_el2(r)      read_sysreg_elx(r, _EL2, _EL1)
  66 #define write_sysreg_el2(v,r)   write_sysreg_elx(v, r, _EL2, _EL1)
  67
  68 #endif  // __KVM_VHE_HYPERVISOR__
  69
  70 /*
  71  * Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
  72  * static inline can allow the compiler to out-of-line this. KVM always wants
  73  * the macro version as it's always inlined.
  74  */
  75 #define __kvm_swab32(x) ___constant_swab32(x)
  76
  77 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
  78
  79 void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
  80 void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
  81 void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
  82 void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
  83 void __vgic_v3_save_vmcr_aprs(struct vgic_v3_cpu_if *cpu_if);
  84 void __vgic_v3_restore_vmcr_aprs(struct vgic_v3_cpu_if *cpu_if);
  85 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
  86
  87 #ifdef __KVM_NVHE_HYPERVISOR__
  88 void __timer_enable_traps(struct kvm_vcpu *vcpu);
  89 void __timer_disable_traps(struct kvm_vcpu *vcpu);
  90 #endif
  91
  92 #ifdef __KVM_NVHE_HYPERVISOR__
  93 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
  94 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
  95 #else
  96 void __vcpu_load_switch_sysregs(struct kvm_vcpu *vcpu);
  97 void __vcpu_put_switch_sysregs(struct kvm_vcpu *vcpu);
  98 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
  99 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
 100 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
 101 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
 102 #endif
 103
 104 void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
 105 void __debug_switch_to_host(struct kvm_vcpu *vcpu);
 106
 107 #ifdef __KVM_NVHE_HYPERVISOR__
 108 void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu);
 109 void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
 110 #endif
 111
 112 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
 113 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
 114 void __sve_save_state(void *sve_pffr, u32 *fpsr, int save_ffr);
 115 void __sve_restore_state(void *sve_pffr, u32 *fpsr, int restore_ffr);
 116
 117 u64 __guest_enter(struct kvm_vcpu *vcpu);
 118
 119 bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt, u32 func_id);
 120
 121 #ifdef __KVM_NVHE_HYPERVISOR__
 122 void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
 123                                u64 elr, u64 par);
 124 #endif
 125
 126 #ifdef __KVM_NVHE_HYPERVISOR__
 127 void __pkvm_init_switch_pgd(phys_addr_t pgd, unsigned long sp,
 128                 void (*fn)(void));
 129 int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
 130                 unsigned long *per_cpu_base, u32 hyp_va_bits);
 131 void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
 132 #endif
 133
 134 extern u64 kvm_nvhe_sym(id_aa64pfr0_el1_sys_val);
 135 extern u64 kvm_nvhe_sym(id_aa64pfr1_el1_sys_val);
 136 extern u64 kvm_nvhe_sym(id_aa64isar0_el1_sys_val);
 137 extern u64 kvm_nvhe_sym(id_aa64isar1_el1_sys_val);
 138 extern u64 kvm_nvhe_sym(id_aa64isar2_el1_sys_val);
 139 extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val);
 140 extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val);
 141 extern u64 kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val);
 142 extern u64 kvm_nvhe_sym(id_aa64smfr0_el1_sys_val);
 143
 144 extern unsigned long kvm_nvhe_sym(__icache_flags);
 145 extern unsigned int kvm_nvhe_sym(kvm_arm_vmid_bits);
 146 extern unsigned int kvm_nvhe_sym(kvm_host_sve_max_vl);
 147
 148 #endif /* __ARM64_KVM_HYP_H__ */