blob: 4eb601e7de507615de61e1925c460f8856b5b00d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#ifndef __ASM__VIRT_H
#define __ASM__VIRT_H
/*
* The arm64 hcall implementation uses x0 to specify the hcall
* number. A value less than HVC_STUB_HCALL_NR indicates a special
* hcall, such as set vector. Any other value is handled in a
* hypervisor specific way.
*
* The hypercall is allowed to clobber any of the caller-saved
* registers (x0-x18), so it is advisable to use it through the
* indirection of a function call (as implemented in hyp-stub.S).
*/
/*
* HVC_SET_VECTORS - Set the value of the vbar_el2 register.
*
* @x1: Physical address of the new vector table.
*/
#define HVC_SET_VECTORS 0
/*
* HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
*/
#define HVC_SOFT_RESTART 1
/*
* HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs
*/
#define HVC_RESET_VECTORS 2
/*
* HVC_FINALISE_EL2 - Upgrade the CPU from EL1 to EL2, if possible
*/
#define HVC_FINALISE_EL2 3
/* Max number of HYP stub hypercalls */
#define HVC_STUB_HCALL_NR 4
/* Error returned when an invalid stub number is passed into x0 */
#define HVC_STUB_ERR 0xbadca11
#define BOOT_CPU_MODE_EL1 (0xe11)
#define BOOT_CPU_MODE_EL2 (0xe12)
/*
* Flags returned together with the boot mode, but not preserved in
* __boot_cpu_mode. Used by the idreg override code to work out the
* boot state.
*/
#define BOOT_CPU_FLAG_E2H BIT_ULL(32)
#ifndef __ASSEMBLY__
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/sysreg.h>
#include <asm/cpufeature.h>
/*
* __boot_cpu_mode records what mode CPUs were booted in.
* A correctly-implemented bootloader must start all CPUs in the same mode:
* In this case, both 32bit halves of __boot_cpu_mode will contain the
* same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
*
* Should the bootloader fail to do this, the two values will be different.
* This allows the kernel to flag an error when the secondaries have come up.
*/
extern u32 __boot_cpu_mode[2];
#define ARM64_VECTOR_TABLE_LEN SZ_2K
void __hyp_set_vectors(phys_addr_t phys_vector_base);
void __hyp_reset_vectors(void);
DECLARE_STATIC_KEY_FALSE(kvm_protected_mode_initialized);
/* Reports the availability of HYP mode */
static inline bool is_hyp_mode_available(void)
{
/*
* If KVM protected mode is initialized, all CPUs must have been booted
* in EL2. Avoid checking __boot_cpu_mode as CPUs now come up in EL1.
*/
if (IS_ENABLED(CONFIG_KVM) &&
static_branch_likely(&kvm_protected_mode_initialized))
return true;
return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
__boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
}
/* Check if the bootloader has booted CPUs in different modes */
static inline bool is_hyp_mode_mismatched(void)
{
/*
* If KVM protected mode is initialized, all CPUs must have been booted
* in EL2. Avoid checking __boot_cpu_mode as CPUs now come up in EL1.
*/
if (IS_ENABLED(CONFIG_KVM) &&
static_branch_likely(&kvm_protected_mode_initialized))
return false;
return __boot_cpu_mode[0] != __boot_cpu_mode[1];
}
static inline bool is_kernel_in_hyp_mode(void)
{
return read_sysreg(CurrentEL) == CurrentEL_EL2;
}
static __always_inline bool has_vhe(void)
{
/*
* Code only run in VHE/NVHE hyp context can assume VHE is present or
* absent. Otherwise fall back to caps.
* This allows the compiler to discard VHE-specific code from the
* nVHE object, reducing the number of external symbol references
* needed to link.
*/
if (is_vhe_hyp_code())
return true;
else if (is_nvhe_hyp_code())
return false;
else
return cpus_have_final_cap(ARM64_HAS_VIRT_HOST_EXTN);
}
static __always_inline bool is_protected_kvm_enabled(void)
{
if (is_vhe_hyp_code())
return false;
else
return cpus_have_final_cap(ARM64_KVM_PROTECTED_MODE);
}
static inline bool is_hyp_nvhe(void)
{
return is_hyp_mode_available() && !is_kernel_in_hyp_mode();
}
#endif /* __ASSEMBLY__ */
#endif /* ! __ASM__VIRT_H */
|
