2 * VGICv2 MMIO handling functions
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/irqchip/arm-gic.h>
15 #include <linux/kvm.h>
16 #include <linux/kvm_host.h>
17 #include <kvm/iodev.h>
18 #include <kvm/arm_vgic.h>
21 #include "vgic-mmio.h"
23 static unsigned long vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
24 gpa_t addr, unsigned int len)
28 switch (addr & 0x0c) {
30 value = vcpu->kvm->arch.vgic.enabled ? GICD_ENABLE : 0;
33 value = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
34 value = (value >> 5) - 1;
35 value |= (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
38 value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
47 static void vgic_mmio_write_v2_misc(struct kvm_vcpu *vcpu,
48 gpa_t addr, unsigned int len,
51 struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
52 bool was_enabled = dist->enabled;
54 switch (addr & 0x0c) {
56 dist->enabled = val & GICD_ENABLE;
57 if (!was_enabled && dist->enabled)
58 vgic_kick_vcpus(vcpu->kvm);
67 static void vgic_mmio_write_sgir(struct kvm_vcpu *source_vcpu,
68 gpa_t addr, unsigned int len,
71 int nr_vcpus = atomic_read(&source_vcpu->kvm->online_vcpus);
72 int intid = val & 0xf;
73 int targets = (val >> 16) & 0xff;
74 int mode = (val >> 24) & 0x03;
76 struct kvm_vcpu *vcpu;
79 case 0x0: /* as specified by targets */
82 targets = (1U << nr_vcpus) - 1; /* all, ... */
83 targets &= ~(1U << source_vcpu->vcpu_id); /* but self */
85 case 0x2: /* this very vCPU only */
86 targets = (1U << source_vcpu->vcpu_id);
88 case 0x3: /* reserved */
92 kvm_for_each_vcpu(c, vcpu, source_vcpu->kvm) {
95 if (!(targets & (1U << c)))
98 irq = vgic_get_irq(source_vcpu->kvm, vcpu, intid);
100 spin_lock(&irq->irq_lock);
101 irq->pending_latch = true;
102 irq->source |= 1U << source_vcpu->vcpu_id;
104 vgic_queue_irq_unlock(source_vcpu->kvm, irq);
105 vgic_put_irq(source_vcpu->kvm, irq);
109 static unsigned long vgic_mmio_read_target(struct kvm_vcpu *vcpu,
110 gpa_t addr, unsigned int len)
112 u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
116 for (i = 0; i < len; i++) {
117 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
119 val |= (u64)irq->targets << (i * 8);
121 vgic_put_irq(vcpu->kvm, irq);
127 static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
128 gpa_t addr, unsigned int len,
131 u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
132 u8 cpu_mask = GENMASK(atomic_read(&vcpu->kvm->online_vcpus) - 1, 0);
135 /* GICD_ITARGETSR[0-7] are read-only */
136 if (intid < VGIC_NR_PRIVATE_IRQS)
139 for (i = 0; i < len; i++) {
140 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid + i);
143 spin_lock(&irq->irq_lock);
145 irq->targets = (val >> (i * 8)) & cpu_mask;
146 target = irq->targets ? __ffs(irq->targets) : 0;
147 irq->target_vcpu = kvm_get_vcpu(vcpu->kvm, target);
149 spin_unlock(&irq->irq_lock);
150 vgic_put_irq(vcpu->kvm, irq);
154 static unsigned long vgic_mmio_read_sgipend(struct kvm_vcpu *vcpu,
155 gpa_t addr, unsigned int len)
157 u32 intid = addr & 0x0f;
161 for (i = 0; i < len; i++) {
162 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
164 val |= (u64)irq->source << (i * 8);
166 vgic_put_irq(vcpu->kvm, irq);
171 static void vgic_mmio_write_sgipendc(struct kvm_vcpu *vcpu,
172 gpa_t addr, unsigned int len,
175 u32 intid = addr & 0x0f;
178 for (i = 0; i < len; i++) {
179 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
181 spin_lock(&irq->irq_lock);
183 irq->source &= ~((val >> (i * 8)) & 0xff);
185 irq->pending_latch = false;
187 spin_unlock(&irq->irq_lock);
188 vgic_put_irq(vcpu->kvm, irq);
192 static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
193 gpa_t addr, unsigned int len,
196 u32 intid = addr & 0x0f;
199 for (i = 0; i < len; i++) {
200 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
202 spin_lock(&irq->irq_lock);
204 irq->source |= (val >> (i * 8)) & 0xff;
207 irq->pending_latch = true;
208 vgic_queue_irq_unlock(vcpu->kvm, irq);
210 spin_unlock(&irq->irq_lock);
212 vgic_put_irq(vcpu->kvm, irq);
216 static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
218 if (kvm_vgic_global_state.type == VGIC_V2)
219 vgic_v2_set_vmcr(vcpu, vmcr);
221 vgic_v3_set_vmcr(vcpu, vmcr);
224 static void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
226 if (kvm_vgic_global_state.type == VGIC_V2)
227 vgic_v2_get_vmcr(vcpu, vmcr);
229 vgic_v3_get_vmcr(vcpu, vmcr);
232 #define GICC_ARCH_VERSION_V2 0x2
234 /* These are for userland accesses only, there is no guest-facing emulation. */
235 static unsigned long vgic_mmio_read_vcpuif(struct kvm_vcpu *vcpu,
236 gpa_t addr, unsigned int len)
238 struct vgic_vmcr vmcr;
241 vgic_get_vmcr(vcpu, &vmcr);
243 switch (addr & 0xff) {
247 case GIC_CPU_PRIMASK:
250 case GIC_CPU_BINPOINT:
253 case GIC_CPU_ALIAS_BINPOINT:
257 val = ((PRODUCT_ID_KVM << 20) |
258 (GICC_ARCH_VERSION_V2 << 16) |
268 static void vgic_mmio_write_vcpuif(struct kvm_vcpu *vcpu,
269 gpa_t addr, unsigned int len,
272 struct vgic_vmcr vmcr;
274 vgic_get_vmcr(vcpu, &vmcr);
276 switch (addr & 0xff) {
280 case GIC_CPU_PRIMASK:
283 case GIC_CPU_BINPOINT:
286 case GIC_CPU_ALIAS_BINPOINT:
291 vgic_set_vmcr(vcpu, &vmcr);
294 static const struct vgic_register_region vgic_v2_dist_registers[] = {
295 REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
296 vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12,
298 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
299 vgic_mmio_read_rao, vgic_mmio_write_wi, 1,
301 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
302 vgic_mmio_read_enable, vgic_mmio_write_senable, 1,
304 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_CLEAR,
305 vgic_mmio_read_enable, vgic_mmio_write_cenable, 1,
307 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_SET,
308 vgic_mmio_read_pending, vgic_mmio_write_spending, 1,
310 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_CLEAR,
311 vgic_mmio_read_pending, vgic_mmio_write_cpending, 1,
313 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_SET,
314 vgic_mmio_read_active, vgic_mmio_write_sactive, 1,
316 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_CLEAR,
317 vgic_mmio_read_active, vgic_mmio_write_cactive, 1,
319 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI,
320 vgic_mmio_read_priority, vgic_mmio_write_priority, 8,
321 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
322 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
323 vgic_mmio_read_target, vgic_mmio_write_target, 8,
324 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
325 REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
326 vgic_mmio_read_config, vgic_mmio_write_config, 2,
328 REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
329 vgic_mmio_read_raz, vgic_mmio_write_sgir, 4,
331 REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
332 vgic_mmio_read_sgipend, vgic_mmio_write_sgipendc, 16,
333 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
334 REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
335 vgic_mmio_read_sgipend, vgic_mmio_write_sgipends, 16,
336 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
339 static const struct vgic_register_region vgic_v2_cpu_registers[] = {
340 REGISTER_DESC_WITH_LENGTH(GIC_CPU_CTRL,
341 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
343 REGISTER_DESC_WITH_LENGTH(GIC_CPU_PRIMASK,
344 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
346 REGISTER_DESC_WITH_LENGTH(GIC_CPU_BINPOINT,
347 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
349 REGISTER_DESC_WITH_LENGTH(GIC_CPU_ALIAS_BINPOINT,
350 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
352 REGISTER_DESC_WITH_LENGTH(GIC_CPU_ACTIVEPRIO,
353 vgic_mmio_read_raz, vgic_mmio_write_wi, 16,
355 REGISTER_DESC_WITH_LENGTH(GIC_CPU_IDENT,
356 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
360 unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev)
362 dev->regions = vgic_v2_dist_registers;
363 dev->nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
365 kvm_iodevice_init(&dev->dev, &kvm_io_gic_ops);
370 int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
372 int nr_irqs = dev->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
373 const struct vgic_register_region *regions;
375 int nr_regions, i, len;
377 addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
379 switch (attr->group) {
380 case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
381 regions = vgic_v2_dist_registers;
382 nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
384 case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
385 regions = vgic_v2_cpu_registers;
386 nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers);
392 /* We only support aligned 32-bit accesses. */
396 for (i = 0; i < nr_regions; i++) {
397 if (regions[i].bits_per_irq)
398 len = (regions[i].bits_per_irq * nr_irqs) / 8;
400 len = regions[i].len;
402 if (regions[i].reg_offset <= addr &&
403 regions[i].reg_offset + len > addr)
411 * When userland tries to access the VGIC register handlers, we need to
412 * create a usable struct vgic_io_device to be passed to the handlers and we
413 * have to set up a buffer similar to what would have happened if a guest MMIO
414 * access occurred, including doing endian conversions on BE systems.
416 static int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
417 bool is_write, int offset, u32 *val)
419 unsigned int len = 4;
424 vgic_data_host_to_mmio_bus(buf, len, *val);
425 ret = kvm_io_gic_ops.write(vcpu, &dev->dev, offset, len, buf);
427 ret = kvm_io_gic_ops.read(vcpu, &dev->dev, offset, len, buf);
429 *val = vgic_data_mmio_bus_to_host(buf, len);
435 int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write,
436 int offset, u32 *val)
438 struct vgic_io_device dev = {
439 .regions = vgic_v2_cpu_registers,
440 .nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers),
441 .iodev_type = IODEV_CPUIF,
444 return vgic_uaccess(vcpu, &dev, is_write, offset, val);
447 int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
448 int offset, u32 *val)
450 struct vgic_io_device dev = {
451 .regions = vgic_v2_dist_registers,
452 .nr_regions = ARRAY_SIZE(vgic_v2_dist_registers),
453 .iodev_type = IODEV_DIST,
456 return vgic_uaccess(vcpu, &dev, is_write, offset, val);