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| 2 | |
| 3 | * Copyright (C) 2012 ARM Ltd.
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| 4 | * Author: Marc Zyngier <[email protected]>
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| 5 |
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| 6 |
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| 7 | #ifndef __ASM__VIRT_H
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| 8 | #define __ASM__VIRT_H
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| 9 |
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| 10 | |
| 11 | * The arm64 hcall implementation uses x0 to specify the hcall
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| 12 | * number. A value less than HVC_STUB_HCALL_NR indicates a special
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| 13 | * hcall, such as set vector. Any other value is handled in a
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| 14 | * hypervisor specific way.
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| 15 | *
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| 16 | * The hypercall is allowed to clobber any of the caller-saved
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| 17 | * registers (x0-x18), so it is advisable to use it through the
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| 18 | * indirection of a function call (as implemented in hyp-stub.S).
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| 19 |
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| 20 |
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| 21 | |
| 22 | * HVC_SET_VECTORS - Set the value of the vbar_el2 register.
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| 23 | *
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| 24 | * @x1: Physical address of the new vector table.
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| 25 |
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| 26 | #define HVC_SET_VECTORS 0
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| 27 |
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| 28 | |
| 29 | * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
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| 30 |
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| 31 | #define HVC_SOFT_RESTART 1
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| 32 |
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| 33 | |
| 34 | * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs
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| 35 |
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| 36 | #define HVC_RESET_VECTORS 2
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| 37 |
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| 38 | |
| 39 | * HVC_FINALISE_EL2 - Upgrade the CPU from EL1 to EL2, if possible
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| 40 |
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| 41 | #define HVC_FINALISE_EL2 3
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| 42 |
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| 43 | |
| 44 | * HVC_GET_ICH_VTR_EL2 - Retrieve the ICH_VTR_EL2 value
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| 45 |
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| 46 | #define HVC_GET_ICH_VTR_EL2 4
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| 47 |
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| 48 |
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| 49 | #define HVC_STUB_HCALL_NR 5
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| 50 |
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| 51 |
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| 52 | #define HVC_STUB_ERR 0xbadca11
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| 53 |
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| 54 | #define BOOT_CPU_MODE_EL1 (0xe11)
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| 55 | #define BOOT_CPU_MODE_EL2 (0xe12)
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| 56 |
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| 57 | |
| 58 | * Flags returned together with the boot mode, but not preserved in
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| 59 | * __boot_cpu_mode. Used by the idreg override code to work out the
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| 60 | * boot state.
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| 61 |
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| 62 | #define BOOT_CPU_FLAG_E2H BIT_ULL(32)
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| 63 |
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| 64 | #ifndef __ASSEMBLER__
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| 65 |
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| 66 | #include <asm/ptrace.h>
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| 67 | #include <asm/sections.h>
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| 68 | #include <asm/sysreg.h>
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| 69 | #include <asm/cpufeature.h>
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| 70 |
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| 71 | |
| 72 | * __boot_cpu_mode records what mode CPUs were booted in.
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| 73 | * A correctly-implemented bootloader must start all CPUs in the same mode:
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| 74 | * In this case, both 32bit halves of __boot_cpu_mode will contain the
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| 75 | * same value (either BOOT_CPU_MODE_EL1 if booted in EL1, BOOT_CPU_MODE_EL2 if
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| 76 | * booted in EL2).
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| 77 | *
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| 78 | * Should the bootloader fail to do this, the two values will be different.
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| 79 | * This allows the kernel to flag an error when the secondaries have come up.
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| 80 |
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| 81 | extern u32 __boot_cpu_mode[2];
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| 82 |
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| 83 | #define ARM64_VECTOR_TABLE_LEN SZ_2K
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| 84 |
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| 85 | void __hyp_set_vectors(phys_addr_t phys_vector_base);
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| 86 | void __hyp_reset_vectors(void);
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| 87 | bool is_kvm_arm_initialised(void);
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| 88 |
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| 89 | DECLARE_STATIC_KEY_FALSE(kvm_protected_mode_initialized);
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| 90 |
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| 91 | static inline bool is_pkvm_initialized(void)
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| 92 | {
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| 93 | return IS_ENABLED(CONFIG_KVM) &&
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| 94 | static_branch_likely(&kvm_protected_mode_initialized);
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| 95 | }
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| 96 |
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| 97 | #ifdef CONFIG_KVM
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| 98 | bool pkvm_force_reclaim_guest_page(phys_addr_t phys);
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| 99 | #else
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| 100 | static inline bool pkvm_force_reclaim_guest_page(phys_addr_t phys)
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| 101 | {
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| 102 | return false;
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| 103 | }
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| 104 | #endif
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| 105 |
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| 106 |
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| 107 | static inline bool is_hyp_mode_available(void)
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| 108 | {
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| 109 | |
| 110 | * If KVM protected mode is initialized, all CPUs must have been booted
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| 111 | * in EL2. Avoid checking __boot_cpu_mode as CPUs now come up in EL1.
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| 112 |
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| 113 | if (is_pkvm_initialized())
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| 114 | return true;
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| 115 |
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| 116 | return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
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| 117 | __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
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| 118 | }
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| 119 |
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| 120 |
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| 121 | static inline bool is_hyp_mode_mismatched(void)
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| 122 | {
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| 123 | |
| 124 | * If KVM protected mode is initialized, all CPUs must have been booted
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| 125 | * in EL2. Avoid checking __boot_cpu_mode as CPUs now come up in EL1.
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| 126 |
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| 127 | if (is_pkvm_initialized())
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| 128 | return false;
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| 129 |
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| 130 | return __boot_cpu_mode[0] != __boot_cpu_mode[1];
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| 131 | }
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| 132 |
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| 133 | static __always_inline bool is_kernel_in_hyp_mode(void)
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| 134 | {
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| 135 | BUILD_BUG_ON(__is_defined(__KVM_NVHE_HYPERVISOR__) ||
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| 136 | __is_defined(__KVM_VHE_HYPERVISOR__));
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| 137 | return read_sysreg(CurrentEL) == CurrentEL_EL2;
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| 138 | }
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| 139 |
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| 140 | static __always_inline bool has_vhe(void)
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| 141 | {
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| 142 | |
| 143 | * Code only run in VHE/NVHE hyp context can assume VHE is present or
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| 144 | * absent. Otherwise fall back to caps.
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| 145 | * This allows the compiler to discard VHE-specific code from the
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| 146 | * nVHE object, reducing the number of external symbol references
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| 147 | * needed to link.
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| 148 |
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| 149 | if (is_vhe_hyp_code())
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| 150 | return true;
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| 151 | else if (is_nvhe_hyp_code())
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| 152 | return false;
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| 153 | else
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| 154 | return cpus_have_final_cap(ARM64_HAS_VIRT_HOST_EXTN);
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| 155 | }
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| 156 |
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| 157 | static __always_inline bool is_protected_kvm_enabled(void)
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| 158 | {
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| 159 | if (is_vhe_hyp_code())
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| 160 | return false;
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| 161 | else
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| 162 | return cpus_have_final_cap(ARM64_KVM_PROTECTED_MODE);
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| 163 | }
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| 164 |
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| 165 | static __always_inline bool has_hvhe(void)
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| 166 | {
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| 167 | if (is_vhe_hyp_code())
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| 168 | return false;
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| 169 |
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| 170 | return cpus_have_final_cap(ARM64_KVM_HVHE);
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| 171 | }
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| 172 |
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| 173 | static inline bool is_hyp_nvhe(void)
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| 174 | {
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| 175 | return is_hyp_mode_available() && !is_kernel_in_hyp_mode();
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| 176 | }
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| 177 |
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| 178 | #endif
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| 179 |
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| 180 | #endif
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