xref: /kvmtool/arm/kvm-cpu.c (revision ce6ae1228ab272c0502d720f3f098a1ac04bd120)
1 #include "kvm/kvm.h"
2 #include "kvm/kvm-cpu.h"
3 
4 static int debug_fd;
5 
6 void kvm_cpu__set_debug_fd(int fd)
7 {
8 	debug_fd = fd;
9 }
10 
11 int kvm_cpu__get_debug_fd(void)
12 {
13 	return debug_fd;
14 }
15 
16 static struct kvm_arm_target *kvm_arm_generic_target;
17 static struct kvm_arm_target *kvm_arm_targets[KVM_ARM_NUM_TARGETS];
18 
19 void kvm_cpu__set_kvm_arm_generic_target(struct kvm_arm_target *target)
20 {
21 	kvm_arm_generic_target = target;
22 }
23 
24 int kvm_cpu__register_kvm_arm_target(struct kvm_arm_target *target)
25 {
26 	unsigned int i = 0;
27 
28 	for (i = 0; i < ARRAY_SIZE(kvm_arm_targets); ++i) {
29 		if (!kvm_arm_targets[i]) {
30 			kvm_arm_targets[i] = target;
31 			return 0;
32 		}
33 	}
34 
35 	return -ENOSPC;
36 }
37 
38 struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
39 {
40 	struct kvm_arm_target *target;
41 	struct kvm_cpu *vcpu;
42 	int coalesced_offset, mmap_size, err = -1;
43 	unsigned int i;
44 	struct kvm_vcpu_init preferred_init;
45 	struct kvm_vcpu_init vcpu_init = {
46 		.features = ARM_VCPU_FEATURE_FLAGS(kvm, cpu_id)
47 	};
48 
49 	vcpu = calloc(1, sizeof(struct kvm_cpu));
50 	if (!vcpu)
51 		return NULL;
52 
53 	vcpu->vcpu_fd = ioctl(kvm->vm_fd, KVM_CREATE_VCPU, cpu_id);
54 	if (vcpu->vcpu_fd < 0)
55 		die_perror("KVM_CREATE_VCPU ioctl");
56 
57 	mmap_size = ioctl(kvm->sys_fd, KVM_GET_VCPU_MMAP_SIZE, 0);
58 	if (mmap_size < 0)
59 		die_perror("KVM_GET_VCPU_MMAP_SIZE ioctl");
60 
61 	vcpu->kvm_run = mmap(NULL, mmap_size, PROT_RW, MAP_SHARED,
62 			     vcpu->vcpu_fd, 0);
63 	if (vcpu->kvm_run == MAP_FAILED)
64 		die("unable to mmap vcpu fd");
65 
66 	/* Set KVM_ARM_VCPU_PSCI_0_2 if available */
67 	if (kvm__supports_extension(kvm, KVM_CAP_ARM_PSCI_0_2)) {
68 		vcpu_init.features[0] |= (1UL << KVM_ARM_VCPU_PSCI_0_2);
69 	}
70 
71 	/*
72 	 * If the preferred target ioctl is successful then
73 	 * use preferred target else try each and every target type
74 	 */
75 	err = ioctl(kvm->vm_fd, KVM_ARM_PREFERRED_TARGET, &preferred_init);
76 	if (!err) {
77 		/* Match preferred target CPU type. */
78 		target = NULL;
79 		for (i = 0; i < ARRAY_SIZE(kvm_arm_targets); ++i) {
80 			if (!kvm_arm_targets[i])
81 				continue;
82 			if (kvm_arm_targets[i]->id == preferred_init.target) {
83 				target = kvm_arm_targets[i];
84 				break;
85 			}
86 		}
87 		if (!target) {
88 			target = kvm_arm_generic_target;
89 			vcpu_init.target = preferred_init.target;
90 		} else {
91 			vcpu_init.target = target->id;
92 		}
93 		err = ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_INIT, &vcpu_init);
94 	} else {
95 		/* Find an appropriate target CPU type. */
96 		for (i = 0; i < ARRAY_SIZE(kvm_arm_targets); ++i) {
97 			if (!kvm_arm_targets[i])
98 				continue;
99 			target = kvm_arm_targets[i];
100 			vcpu_init.target = target->id;
101 			err = ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_INIT, &vcpu_init);
102 			if (!err)
103 				break;
104 		}
105 		if (err)
106 			die("Unable to find matching target");
107 	}
108 
109 	if (err || target->init(vcpu))
110 		die("Unable to initialise vcpu");
111 
112 	coalesced_offset = ioctl(kvm->sys_fd, KVM_CHECK_EXTENSION,
113 				 KVM_CAP_COALESCED_MMIO);
114 	if (coalesced_offset)
115 		vcpu->ring = (void *)vcpu->kvm_run +
116 			     (coalesced_offset * PAGE_SIZE);
117 
118 	/* Populate the vcpu structure. */
119 	vcpu->kvm		= kvm;
120 	vcpu->cpu_id		= cpu_id;
121 	vcpu->cpu_type		= vcpu_init.target;
122 	vcpu->cpu_compatible	= target->compatible;
123 	vcpu->is_running	= true;
124 
125 	return vcpu;
126 }
127 
128 void kvm_cpu__arch_nmi(struct kvm_cpu *cpu)
129 {
130 }
131 
132 void kvm_cpu__delete(struct kvm_cpu *vcpu)
133 {
134 	free(vcpu);
135 }
136 
137 bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu)
138 {
139 	return false;
140 }
141 
142 void kvm_cpu__show_page_tables(struct kvm_cpu *vcpu)
143 {
144 }
145