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/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  * Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
  52  * static inline can allow the compiler to out-of-line this. KVM always wants
  53  * the macro version as its always inlined.
  54  */
  55 #define __kvm_swab32(x) ___constant_swab32(x)
  56
  57 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
  58
  59 void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
  60 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
  61 void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu);
  62 void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu);
  63 void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu);
  64 void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu);
  65 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
  66
  67 void __timer_enable_traps(struct kvm_vcpu *vcpu);
  68 void __timer_disable_traps(struct kvm_vcpu *vcpu);
  69
  70 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
  71 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
  72 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
  73 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
  74 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
  75 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
  76 void __sysreg32_save_state(struct kvm_vcpu *vcpu);
  77 void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
  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 void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
  86 void deactivate_traps_vhe_put(void);
  87
  88 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
  89 void __noreturn __hyp_do_panic(unsigned long, ...);
  90
  91 /*
  92  * Must be called from hyp code running at EL2 with an updated VTTBR
  93  * and interrupts disabled.
  94  */
  95 static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
  96 {
  97         write_sysreg(kvm->arch.vtcr, vtcr_el2);
  98         write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
  99
 100         /*
 101          * ARM errata 1165522 and 1530923 require the actual execution of the
 102          * above before we can switch to the EL1/EL0 translation regime used by
 103          * the guest.
 104          */
 105         asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));
 106 }
 107
 108 #endif /* __ARM64_KVM_HYP_H__ */
 109