arch/arm64/include/asm/kvm_hyp.h

   1 /*
   2  * Copyright (C) 2015 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef __ARM64_KVM_HYP_H__
  19 #define __ARM64_KVM_HYP_H__
  20
  21 #include <linux/compiler.h>
  22 #include <linux/kvm_host.h>
  23 #include <asm/kvm_mmu.h>
  24 #include <asm/sysreg.h>
  25
  26 #define __hyp_text __section(.hyp.text) notrace
  27
  28 static inline unsigned long __kern_hyp_va(unsigned long v)
  29 {
  30         asm volatile(ALTERNATIVE("and %0, %0, %1",
  31                                  "nop",
  32                                  ARM64_HAS_VIRT_HOST_EXTN)
  33                      : "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
  34         return v;
  35 }
  36
  37 #define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
  38
  39 #define read_sysreg_elx(r,nvh,vh)                                       \
  40         ({                                                              \
  41                 u64 reg;                                                \
  42                 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
  43                                          "mrs_s %0, " __stringify(r##vh),\
  44                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  45                              : "=r" (reg));                             \
  46                 reg;                                                    \
  47         })
  48
  49 #define write_sysreg_elx(v,r,nvh,vh)                                    \
  50         do {                                                            \
  51                 u64 __val = (u64)(v);                                   \
  52                 asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
  53                                          "msr_s " __stringify(r##vh) ", %x0",\
  54                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  55                                          : : "rZ" (__val));             \
  56         } while (0)
  57
  58 /*
  59  * Unified accessors for registers that have a different encoding
  60  * between VHE and non-VHE. They must be specified without their "ELx"
  61  * encoding.
  62  */
  63 #define read_sysreg_el2(r)                                              \
  64         ({                                                              \
  65                 u64 reg;                                                \
  66                 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
  67                                          "mrs %0, " __stringify(r##_EL1),\
  68                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  69                              : "=r" (reg));                             \
  70                 reg;                                                    \
  71         })
  72
  73 #define write_sysreg_el2(v,r)                                           \
  74         do {                                                            \
  75                 u64 __val = (u64)(v);                                   \
  76                 asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
  77                                          "msr " __stringify(r##_EL1) ", %x0",\
  78                                          ARM64_HAS_VIRT_HOST_EXTN)      \
  79                                          : : "rZ" (__val));             \
  80         } while (0)
  81
  82 #define read_sysreg_el0(r)      read_sysreg_elx(r, _EL0, _EL02)
  83 #define write_sysreg_el0(v,r)   write_sysreg_elx(v, r, _EL0, _EL02)
  84 #define read_sysreg_el1(r)      read_sysreg_elx(r, _EL1, _EL12)
  85 #define write_sysreg_el1(v,r)   write_sysreg_elx(v, r, _EL1, _EL12)
  86
  87 /* The VHE specific system registers and their encoding */
  88 #define sctlr_EL12              sys_reg(3, 5, 1, 0, 0)
  89 #define cpacr_EL12              sys_reg(3, 5, 1, 0, 2)
  90 #define ttbr0_EL12              sys_reg(3, 5, 2, 0, 0)
  91 #define ttbr1_EL12              sys_reg(3, 5, 2, 0, 1)
  92 #define tcr_EL12                sys_reg(3, 5, 2, 0, 2)
  93 #define afsr0_EL12              sys_reg(3, 5, 5, 1, 0)
  94 #define afsr1_EL12              sys_reg(3, 5, 5, 1, 1)
  95 #define esr_EL12                sys_reg(3, 5, 5, 2, 0)
  96 #define far_EL12                sys_reg(3, 5, 6, 0, 0)
  97 #define mair_EL12               sys_reg(3, 5, 10, 2, 0)
  98 #define amair_EL12              sys_reg(3, 5, 10, 3, 0)
  99 #define vbar_EL12               sys_reg(3, 5, 12, 0, 0)
 100 #define contextidr_EL12         sys_reg(3, 5, 13, 0, 1)
 101 #define cntkctl_EL12            sys_reg(3, 5, 14, 1, 0)
 102 #define cntp_tval_EL02          sys_reg(3, 5, 14, 2, 0)
 103 #define cntp_ctl_EL02           sys_reg(3, 5, 14, 2, 1)
 104 #define cntp_cval_EL02          sys_reg(3, 5, 14, 2, 2)
 105 #define cntv_tval_EL02          sys_reg(3, 5, 14, 3, 0)
 106 #define cntv_ctl_EL02           sys_reg(3, 5, 14, 3, 1)
 107 #define cntv_cval_EL02          sys_reg(3, 5, 14, 3, 2)
 108 #define spsr_EL12               sys_reg(3, 5, 4, 0, 0)
 109 #define elr_EL12                sys_reg(3, 5, 4, 0, 1)
 110
 111 /**
 112  * hyp_alternate_select - Generates patchable code sequences that are
 113  * used to switch between two implementations of a function, depending
 114  * on the availability of a feature.
 115  *
 116  * @fname: a symbol name that will be defined as a function returning a
 117  * function pointer whose type will match @orig and @alt
 118  * @orig: A pointer to the default function, as returned by @fname when
 119  * @cond doesn't hold
 120  * @alt: A pointer to the alternate function, as returned by @fname
 121  * when @cond holds
 122  * @cond: a CPU feature (as described in asm/cpufeature.h)
 123  */
 124 #define hyp_alternate_select(fname, orig, alt, cond)                    \
 125 typeof(orig) * __hyp_text fname(void)                                   \
 126 {                                                                       \
 127         typeof(alt) *val = orig;                                        \
 128         asm volatile(ALTERNATIVE("nop           \n",                    \
 129                                  "mov   %0, %1  \n",                    \
 130                                  cond)                                  \
 131                      : "+r" (val) : "r" (alt));                         \
 132         return val;                                                     \
 133 }
 134
 135 void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
 136 void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
 137
 138 void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
 139 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
 140
 141 void __timer_save_state(struct kvm_vcpu *vcpu);
 142 void __timer_restore_state(struct kvm_vcpu *vcpu);
 143
 144 void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
 145 void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
 146 void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
 147 void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
 148 void __sysreg32_save_state(struct kvm_vcpu *vcpu);
 149 void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
 150
 151 void __debug_save_state(struct kvm_vcpu *vcpu,
 152                         struct kvm_guest_debug_arch *dbg,
 153                         struct kvm_cpu_context *ctxt);
 154 void __debug_restore_state(struct kvm_vcpu *vcpu,
 155                            struct kvm_guest_debug_arch *dbg,
 156                            struct kvm_cpu_context *ctxt);
 157 void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
 158 void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
 159
 160 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
 161 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
 162 bool __fpsimd_enabled(void);
 163
 164 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
 165 void __noreturn __hyp_do_panic(unsigned long, ...);
 166
 167 #endif /* __ARM64_KVM_HYP_H__ */
 168