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 #define read_sysreg_elx(r,nvh,vh)                                       \
  20         ({                                                              \
  21                 u64 reg;                                                \
  22                 asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \
  23                                          __mrs_s("%0", r##vh),          \
  24                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  25                              : "=r" (reg));                             \
  26                 reg;                                                    \
  27         })
  28
  29 #define write_sysreg_elx(v,r,nvh,vh)                                    \
  30         do {                                                            \
  31                 u64 __val = (u64)(v);                                   \
  32                 asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"),        \
  33                                          __msr_s(r##vh, "%x0"),         \
  34                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  35                                          : : "rZ" (__val));             \
  36         } while (0)
  37
  38 /*
  39  * Unified accessors for registers that have a different encoding
  40  * between VHE and non-VHE. They must be specified without their "ELx"
  41  * encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
  42  */
  43
  44 #define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  45 #define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  46 #define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  47 #define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  48 #define read_sysreg_el2(r)      read_sysreg_elx(r, _EL2, _EL1)
  49 #define write_sysreg_el2(v,r)   write_sysreg_elx(v, r, _EL2, _EL1)
  50
  51 /*
  52  * Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
  53  * static inline can allow the compiler to out-of-line this. KVM always wants
  54  * the macro version as its always inlined.
  55  */
  56 #define __kvm_swab32(x) ___constant_swab32(x)
  57
  58 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
  59
  60 void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
  61 void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
  62 void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
  63 void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
  64 void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
  65 void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
  66 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
  67
  68 #ifdef __KVM_NVHE_HYPERVISOR__
  69 void __timer_enable_traps(struct kvm_vcpu *vcpu);
  70 void __timer_disable_traps(struct kvm_vcpu *vcpu);
  71 #endif
  72
  73 #ifdef __KVM_NVHE_HYPERVISOR__
  74 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
  75 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
  76 #else
  77 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
  78 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
  79 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
  80 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
  81 #endif
  82
  83 void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
  84 void __debug_switch_to_host(struct kvm_vcpu *vcpu);
  85
  86 #ifdef __KVM_NVHE_HYPERVISOR__
  87 void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu);
  88 void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
  89 #endif
  90
  91 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
  92 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
  93 void __sve_save_state(void *sve_pffr, u32 *fpsr);
  94 void __sve_restore_state(void *sve_pffr, u32 *fpsr);
  95
  96 #ifndef __KVM_NVHE_HYPERVISOR__
  97 void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
  98 void deactivate_traps_vhe_put(struct kvm_vcpu *vcpu);
  99 #endif
 100
 101 u64 __guest_enter(struct kvm_vcpu *vcpu);
 102
 103 bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt);
 104
 105 #ifdef __KVM_NVHE_HYPERVISOR__
 106 void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
 107                                u64 elr, u64 par);
 108 #endif
 109
 110 #ifdef __KVM_NVHE_HYPERVISOR__
 111 void __pkvm_init_switch_pgd(phys_addr_t phys, unsigned long size,
 112                             phys_addr_t pgd, void *sp, void *cont_fn);
 113 int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
 114                 unsigned long *per_cpu_base, u32 hyp_va_bits);
 115 void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
 116 #endif
 117
 118 extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val);
 119 extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val);
 120
 121 #endif /* __ARM64_KVM_HYP_H__ */