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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
4 */
5
6#ifndef __ASM_LOONGARCH_KVM_VCPU_H__
7#define __ASM_LOONGARCH_KVM_VCPU_H__
8
9#include <linux/kvm_host.h>
10#include <asm/loongarch.h>
11
12/* Controlled by 0x5 guest estat */
13#define CPU_SIP0 (_ULCAST_(1))
14#define CPU_SIP1 (_ULCAST_(1) << 1)
15#define CPU_PMU (_ULCAST_(1) << 10)
16#define CPU_TIMER (_ULCAST_(1) << 11)
17#define CPU_IPI (_ULCAST_(1) << 12)
18
19/* Controlled by 0x52 guest exception VIP aligned to estat bit 5~12 */
20#define CPU_IP0 (_ULCAST_(1))
21#define CPU_IP1 (_ULCAST_(1) << 1)
22#define CPU_IP2 (_ULCAST_(1) << 2)
23#define CPU_IP3 (_ULCAST_(1) << 3)
24#define CPU_IP4 (_ULCAST_(1) << 4)
25#define CPU_IP5 (_ULCAST_(1) << 5)
26#define CPU_IP6 (_ULCAST_(1) << 6)
27#define CPU_IP7 (_ULCAST_(1) << 7)
28
29#define MNSEC_PER_SEC (NSEC_PER_SEC >> 20)
30
31/* KVM_IRQ_LINE irq field index values */
32#define KVM_LOONGSON_IRQ_TYPE_SHIFT 24
33#define KVM_LOONGSON_IRQ_TYPE_MASK 0xff
34#define KVM_LOONGSON_IRQ_VCPU_SHIFT 16
35#define KVM_LOONGSON_IRQ_VCPU_MASK 0xff
36#define KVM_LOONGSON_IRQ_NUM_SHIFT 0
37#define KVM_LOONGSON_IRQ_NUM_MASK 0xffff
38
39typedef union loongarch_instruction larch_inst;
40typedef int (*exit_handle_fn)(struct kvm_vcpu *, int);
41
42int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst);
43int kvm_emu_mmio_write(struct kvm_vcpu *vcpu, larch_inst inst);
44int kvm_complete_mmio_read(struct kvm_vcpu *vcpu, struct kvm_run *run);
45int kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run);
46int kvm_complete_user_service(struct kvm_vcpu *vcpu, struct kvm_run *run);
47int kvm_emu_idle(struct kvm_vcpu *vcpu);
48int kvm_pending_timer(struct kvm_vcpu *vcpu);
49int kvm_handle_fault(struct kvm_vcpu *vcpu, int fault);
50void kvm_deliver_intr(struct kvm_vcpu *vcpu);
51void kvm_deliver_exception(struct kvm_vcpu *vcpu);
52
53void kvm_own_fpu(struct kvm_vcpu *vcpu);
54void kvm_lose_fpu(struct kvm_vcpu *vcpu);
55void kvm_save_fpu(struct loongarch_fpu *fpu);
56void kvm_restore_fpu(struct loongarch_fpu *fpu);
57void kvm_restore_fcsr(struct loongarch_fpu *fpu);
58
59#ifdef CONFIG_CPU_HAS_LSX
60int kvm_own_lsx(struct kvm_vcpu *vcpu);
61void kvm_save_lsx(struct loongarch_fpu *fpu);
62void kvm_restore_lsx(struct loongarch_fpu *fpu);
63#else
64static inline int kvm_own_lsx(struct kvm_vcpu *vcpu) { return -EINVAL; }
65static inline void kvm_save_lsx(struct loongarch_fpu *fpu) { }
66static inline void kvm_restore_lsx(struct loongarch_fpu *fpu) { }
67#endif
68
69#ifdef CONFIG_CPU_HAS_LASX
70int kvm_own_lasx(struct kvm_vcpu *vcpu);
71void kvm_save_lasx(struct loongarch_fpu *fpu);
72void kvm_restore_lasx(struct loongarch_fpu *fpu);
73#else
74static inline int kvm_own_lasx(struct kvm_vcpu *vcpu) { return -EINVAL; }
75static inline void kvm_save_lasx(struct loongarch_fpu *fpu) { }
76static inline void kvm_restore_lasx(struct loongarch_fpu *fpu) { }
77#endif
78
79#ifdef CONFIG_CPU_HAS_LBT
80int kvm_own_lbt(struct kvm_vcpu *vcpu);
81#else
82static inline int kvm_own_lbt(struct kvm_vcpu *vcpu) { return -EINVAL; }
83#endif
84
85void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long hz);
86void kvm_save_timer(struct kvm_vcpu *vcpu);
87void kvm_restore_timer(struct kvm_vcpu *vcpu);
88
89int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq);
90struct kvm_vcpu *kvm_get_vcpu_by_cpuid(struct kvm *kvm, int cpuid);
91
92/*
93 * Loongarch KVM guest interrupt handling
94 */
95static inline void kvm_queue_irq(struct kvm_vcpu *vcpu, unsigned int irq)
96{
97 set_bit(irq, &vcpu->arch.irq_pending);
98 clear_bit(irq, &vcpu->arch.irq_clear);
99}
100
101static inline void kvm_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int irq)
102{
103 clear_bit(irq, &vcpu->arch.irq_pending);
104 set_bit(irq, &vcpu->arch.irq_clear);
105}
106
107static inline int kvm_queue_exception(struct kvm_vcpu *vcpu,
108 unsigned int code, unsigned int subcode)
109{
110 /* only one exception can be injected */
111 if (!vcpu->arch.exception_pending) {
112 set_bit(code, &vcpu->arch.exception_pending);
113 vcpu->arch.esubcode = subcode;
114 return 0;
115 } else
116 return -1;
117}
118
119static inline unsigned long kvm_read_reg(struct kvm_vcpu *vcpu, int num)
120{
121 return vcpu->arch.gprs[num];
122}
123
124static inline void kvm_write_reg(struct kvm_vcpu *vcpu, int num, unsigned long val)
125{
126 vcpu->arch.gprs[num] = val;
127}
128
129static inline bool kvm_pvtime_supported(void)
130{
131 return !!sched_info_on();
132}
133
134static inline bool kvm_guest_has_pv_feature(struct kvm_vcpu *vcpu, unsigned int feature)
135{
136 return vcpu->kvm->arch.pv_features & BIT(feature);
137}
138
139#endif /* __ASM_LOONGARCH_KVM_VCPU_H__ */