tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012,2013 - ARM Ltd
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 */
6
7#ifndef __ARM_KVM_ASM_H__
8#define __ARM_KVM_ASM_H__
9
10#include <asm/virt.h>
11
12#define VCPU_WORKAROUND_2_FLAG_SHIFT 0
13#define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
14
15#define ARM_EXIT_WITH_SERROR_BIT 31
16#define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
17#define ARM_EXCEPTION_IS_TRAP(x) (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
18#define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
19
20#define ARM_EXCEPTION_IRQ 0
21#define ARM_EXCEPTION_EL1_SERROR 1
22#define ARM_EXCEPTION_TRAP 2
23#define ARM_EXCEPTION_IL 3
24/* The hyp-stub will return this for any kvm_call_hyp() call */
25#define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR
26
27#define kvm_arm_exception_type \
28 {ARM_EXCEPTION_IRQ, "IRQ" }, \
29 {ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \
30 {ARM_EXCEPTION_TRAP, "TRAP" }, \
31 {ARM_EXCEPTION_HYP_GONE, "HYP_GONE" }
32
33/*
34 * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
35 * that jumps over this.
36 */
37#define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE)
38
39#ifndef __ASSEMBLY__
40
41#include <linux/mm.h>
42
43/* Translate a kernel address of @sym into its equivalent linear mapping */
44#define kvm_ksym_ref(sym) \
45 ({ \
46 void *val = &sym; \
47 if (!is_kernel_in_hyp_mode()) \
48 val = lm_alias(&sym); \
49 val; \
50 })
51
52struct kvm;
53struct kvm_vcpu;
54
55extern char __kvm_hyp_init[];
56extern char __kvm_hyp_init_end[];
57
58extern char __kvm_hyp_vector[];
59
60extern void __kvm_flush_vm_context(void);
61extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
62extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
63extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
64
65extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
66
67extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
68
69extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
70
71extern u64 __vgic_v3_get_ich_vtr_el2(void);
72extern u64 __vgic_v3_read_vmcr(void);
73extern void __vgic_v3_write_vmcr(u32 vmcr);
74extern void __vgic_v3_init_lrs(void);
75
76extern u32 __kvm_get_mdcr_el2(void);
77
78/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
79#define __hyp_this_cpu_ptr(sym) \
80 ({ \
81 void *__ptr = hyp_symbol_addr(sym); \
82 __ptr += read_sysreg(tpidr_el2); \
83 (typeof(&sym))__ptr; \
84 })
85
86#define __hyp_this_cpu_read(sym) \
87 ({ \
88 *__hyp_this_cpu_ptr(sym); \
89 })
90
91#else /* __ASSEMBLY__ */
92
93.macro hyp_adr_this_cpu reg, sym, tmp
94 adr_l \reg, \sym
95 mrs \tmp, tpidr_el2
96 add \reg, \reg, \tmp
97.endm
98
99.macro hyp_ldr_this_cpu reg, sym, tmp
100 adr_l \reg, \sym
101 mrs \tmp, tpidr_el2
102 ldr \reg, [\reg, \tmp]
103.endm
104
105.macro get_host_ctxt reg, tmp
106 hyp_adr_this_cpu \reg, kvm_host_data, \tmp
107 add \reg, \reg, #HOST_DATA_CONTEXT
108.endm
109
110.macro get_vcpu_ptr vcpu, ctxt
111 get_host_ctxt \ctxt, \vcpu
112 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
113 kern_hyp_va \vcpu
114.endm
115
116#endif
117
118#endif /* __ARM_KVM_ASM_H__ */