Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ARM Generic Interrupt Controller (GIC) v3 host support
4 */
5
6#include <linux/kernel.h>
7#include <linux/kvm.h>
8#include <linux/sizes.h>
9#include <asm/cputype.h>
10#include <asm/kvm_para.h>
11#include <asm/kvm.h>
12
13#include "kvm_util.h"
14#include "vgic.h"
15#include "gic.h"
16#include "gic_v3.h"
17
18bool kvm_supports_vgic_v3(void)
19{
20 struct kvm_vm *vm = vm_create_barebones();
21 int r;
22
23 r = __kvm_test_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3);
24 kvm_vm_free(vm);
25
26 return !r;
27}
28
29/*
30 * vGIC-v3 default host setup
31 *
32 * Input args:
33 * vm - KVM VM
34 * nr_vcpus - Number of vCPUs supported by this VM
35 *
36 * Output args: None
37 *
38 * Return: GIC file-descriptor or negative error code upon failure
39 *
40 * The function creates a vGIC-v3 device and maps the distributor and
41 * redistributor regions of the guest. Since it depends on the number of
42 * vCPUs for the VM, it must be called after all the vCPUs have been created.
43 */
44int __vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, u32 nr_irqs)
45{
46 int gic_fd;
47 u64 attr;
48 unsigned int nr_gic_pages;
49
50 /* Distributor setup */
51 gic_fd = __kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3);
52 if (gic_fd < 0)
53 return gic_fd;
54
55 kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, &nr_irqs);
56
57 attr = GICD_BASE_GPA;
58 kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
59 KVM_VGIC_V3_ADDR_TYPE_DIST, &attr);
60 nr_gic_pages = vm_calc_num_guest_pages(vm->mode, KVM_VGIC_V3_DIST_SIZE);
61 virt_map(vm, GICD_BASE_GPA, GICD_BASE_GPA, nr_gic_pages);
62
63 /* Redistributor setup */
64 attr = REDIST_REGION_ATTR_ADDR(nr_vcpus, GICR_BASE_GPA, 0, 0);
65 kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
66 KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &attr);
67 nr_gic_pages = vm_calc_num_guest_pages(vm->mode,
68 KVM_VGIC_V3_REDIST_SIZE * nr_vcpus);
69 virt_map(vm, GICR_BASE_GPA, GICR_BASE_GPA, nr_gic_pages);
70
71 return gic_fd;
72}
73
74void __vgic_v3_init(int fd)
75{
76 kvm_device_attr_set(fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
77 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
78}
79
80int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, u32 nr_irqs)
81{
82 unsigned int nr_vcpus_created = 0;
83 struct list_head *iter;
84 int fd;
85
86 TEST_ASSERT(nr_vcpus, "Number of vCPUs cannot be empty");
87
88 /*
89 * Make sure that the caller is infact calling this
90 * function after all the vCPUs are added.
91 */
92 list_for_each(iter, &vm->vcpus)
93 nr_vcpus_created++;
94 TEST_ASSERT(nr_vcpus == nr_vcpus_created,
95 "Number of vCPUs requested (%u) doesn't match with the ones created for the VM (%u)",
96 nr_vcpus, nr_vcpus_created);
97
98 fd = __vgic_v3_setup(vm, nr_vcpus, nr_irqs);
99 if (fd < 0)
100 return fd;
101
102 __vgic_v3_init(fd);
103 return fd;
104}
105
106/* should only work for level sensitive interrupts */
107int _kvm_irq_set_level_info(int gic_fd, u32 intid, int level)
108{
109 u64 attr = 32 * (intid / 32);
110 u64 index = intid % 32;
111 u64 val;
112 int ret;
113
114 ret = __kvm_device_attr_get(gic_fd, KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO,
115 attr, &val);
116 if (ret != 0)
117 return ret;
118
119 val |= 1U << index;
120 ret = __kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO,
121 attr, &val);
122 return ret;
123}
124
125void kvm_irq_set_level_info(int gic_fd, u32 intid, int level)
126{
127 int ret = _kvm_irq_set_level_info(gic_fd, intid, level);
128
129 TEST_ASSERT(!ret, KVM_IOCTL_ERROR(KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO, ret));
130}
131
132int _kvm_arm_irq_line(struct kvm_vm *vm, u32 intid, int level)
133{
134 u32 irq = intid & KVM_ARM_IRQ_NUM_MASK;
135
136 TEST_ASSERT(!INTID_IS_SGI(intid), "KVM_IRQ_LINE's interface itself "
137 "doesn't allow injecting SGIs. There's no mask for it.");
138
139 if (INTID_IS_PPI(intid))
140 irq |= KVM_ARM_IRQ_TYPE_PPI << KVM_ARM_IRQ_TYPE_SHIFT;
141 else
142 irq |= KVM_ARM_IRQ_TYPE_SPI << KVM_ARM_IRQ_TYPE_SHIFT;
143
144 return _kvm_irq_line(vm, irq, level);
145}
146
147void kvm_arm_irq_line(struct kvm_vm *vm, u32 intid, int level)
148{
149 int ret = _kvm_arm_irq_line(vm, intid, level);
150
151 TEST_ASSERT(!ret, KVM_IOCTL_ERROR(KVM_IRQ_LINE, ret));
152}
153
154static void vgic_poke_irq(int gic_fd, u32 intid, struct kvm_vcpu *vcpu,
155 u64 reg_off)
156{
157 u64 reg = intid / 32;
158 u64 index = intid % 32;
159 u64 attr = reg_off + reg * 4;
160 u64 val;
161 bool intid_is_private = INTID_IS_SGI(intid) || INTID_IS_PPI(intid);
162
163 u32 group = intid_is_private ? KVM_DEV_ARM_VGIC_GRP_REDIST_REGS
164 : KVM_DEV_ARM_VGIC_GRP_DIST_REGS;
165
166 if (intid_is_private) {
167 /* TODO: only vcpu 0 implemented for now. */
168 assert(vcpu->id == 0);
169 attr += SZ_64K;
170 }
171
172 /* Check that the addr part of the attr is within 32 bits. */
173 assert((attr & ~KVM_DEV_ARM_VGIC_OFFSET_MASK) == 0);
174
175 /*
176 * All calls will succeed, even with invalid intid's, as long as the
177 * addr part of the attr is within 32 bits (checked above). An invalid
178 * intid will just make the read/writes point to above the intended
179 * register space (i.e., ICPENDR after ISPENDR).
180 */
181 kvm_device_attr_get(gic_fd, group, attr, &val);
182 val |= 1ULL << index;
183 kvm_device_attr_set(gic_fd, group, attr, &val);
184}
185
186void kvm_irq_write_ispendr(int gic_fd, u32 intid, struct kvm_vcpu *vcpu)
187{
188 vgic_poke_irq(gic_fd, intid, vcpu, GICD_ISPENDR);
189}
190
191void kvm_irq_write_isactiver(int gic_fd, u32 intid, struct kvm_vcpu *vcpu)
192{
193 vgic_poke_irq(gic_fd, intid, vcpu, GICD_ISACTIVER);
194}
195
196int vgic_its_setup(struct kvm_vm *vm)
197{
198 int its_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_ITS);
199 u64 attr;
200
201 attr = GITS_BASE_GPA;
202 kvm_device_attr_set(its_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
203 KVM_VGIC_ITS_ADDR_TYPE, &attr);
204
205 kvm_device_attr_set(its_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
206 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
207
208 virt_map(vm, GITS_BASE_GPA, GITS_BASE_GPA,
209 vm_calc_num_guest_pages(vm->mode, KVM_VGIC_V3_ITS_SIZE));
210
211 return its_fd;
212}