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 #define read_sysreg_elx(r,nvh,vh)                                       \
  16         ({                                                              \
  17                 u64 reg;                                                \
  18                 asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \
  19                                          __mrs_s("%0", r##vh),          \
  20                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  21                              : "=r" (reg));                             \
  22                 reg;                                                    \
  23         })
  24
  25 #define write_sysreg_elx(v,r,nvh,vh)                                    \
  26         do {                                                            \
  27                 u64 __val = (u64)(v);                                   \
  28                 asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"),        \
  29                                          __msr_s(r##vh, "%x0"),         \
  30                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  31                                          : : "rZ" (__val));             \
  32         } while (0)
  33
  34 /*
  35  * Unified accessors for registers that have a different encoding
  36  * between VHE and non-VHE. They must be specified without their "ELx"
  37  * encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
  38  */
  39
  40 #define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  41 #define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  42 #define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  43 #define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  44 #define read_sysreg_el2(r)      read_sysreg_elx(r, _EL2, _EL1)
  45 #define write_sysreg_el2(v,r)   write_sysreg_elx(v, r, _EL2, _EL1)
  46
  47 /*
  48  * Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
  49  * static inline can allow the compiler to out-of-line this. KVM always wants
  50  * the macro version as its always inlined.
  51  */
  52 #define __kvm_swab32(x) ___constant_swab32(x)
  53
  54 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
  55
  56 void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
  57 void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
  58 void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
  59 void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
  60 void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
  61 void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
  62 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
  63
  64 #ifdef __KVM_NVHE_HYPERVISOR__
  65 void __timer_enable_traps(struct kvm_vcpu *vcpu);
  66 void __timer_disable_traps(struct kvm_vcpu *vcpu);
  67 #endif
  68
  69 #ifdef __KVM_NVHE_HYPERVISOR__
  70 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
  71 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
  72 #else
  73 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
  74 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
  75 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
  76 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
  77 #endif
  78
  79 void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
  80 void __debug_switch_to_host(struct kvm_vcpu *vcpu);
  81
  82 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
  83 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
  84
  85 #ifndef __KVM_NVHE_HYPERVISOR__
  86 void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
  87 void deactivate_traps_vhe_put(void);
  88 #endif
  89
  90 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
  91
  92 void __noreturn hyp_panic(struct kvm_cpu_context *host_ctxt);
  93 #ifdef __KVM_NVHE_HYPERVISOR__
  94 void __noreturn __hyp_do_panic(unsigned long, ...);
  95 #endif
  96
  97 #endif /* __ARM64_KVM_HYP_H__ */
  98