#include "vgic-mmio.h"
/* extract @num bytes at @offset bytes offset in data */
-static unsigned long extract_bytes(unsigned long data, unsigned int offset,
- unsigned int num)
+unsigned long extract_bytes(unsigned long data, unsigned int offset,
+ unsigned int num)
{
return (data >> (offset * 8)) & GENMASK_ULL(num * 8 - 1, 0);
}
+/* allows updates of any half of a 64-bit register (or the whole thing) */
+u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
+ unsigned long val)
+{
+ int lower = (offset & 4) * 8;
+ int upper = lower + 8 * len - 1;
+
+ reg &= ~GENMASK_ULL(upper, lower);
+ val &= GENMASK_ULL(len * 8 - 1, 0);
+
+ return reg | ((u64)val << lower);
+}
+
+bool vgic_has_its(struct kvm *kvm)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+
+ if (dist->vgic_model != KVM_DEV_TYPE_ARM_VGIC_V3)
+ return false;
+
+ return dist->has_its;
+}
+
static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
case GICD_TYPER:
value = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
value = (value >> 5) - 1;
- value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19;
+ if (vgic_has_its(vcpu->kvm)) {
+ value |= (INTERRUPT_ID_BITS_ITS - 1) << 19;
+ value |= GICD_TYPER_LPIS;
+ } else {
+ value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19;
+ }
break;
case GICD_IIDR:
value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
{
int intid = VGIC_ADDR_TO_INTID(addr, 64);
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid);
+ unsigned long ret = 0;
if (!irq)
return 0;
/* The upper word is RAZ for us. */
- if (addr & 4)
- return 0;
+ if (!(addr & 4))
+ ret = extract_bytes(READ_ONCE(irq->mpidr), addr & 7, len);
- return extract_bytes(READ_ONCE(irq->mpidr), addr & 7, len);
+ vgic_put_irq(vcpu->kvm, irq);
+ return ret;
}
static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,
unsigned long val)
{
int intid = VGIC_ADDR_TO_INTID(addr, 64);
- struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid);
-
- if (!irq)
- return;
+ struct vgic_irq *irq;
/* The upper word is WI for us since we don't implement Aff3. */
if (addr & 4)
return;
+ irq = vgic_get_irq(vcpu->kvm, NULL, intid);
+
+ if (!irq)
+ return;
+
spin_lock(&irq->irq_lock);
/* We only care about and preserve Aff0, Aff1 and Aff2. */
irq->target_vcpu = kvm_mpidr_to_vcpu(vcpu->kvm, irq->mpidr);
spin_unlock(&irq->irq_lock);
+ vgic_put_irq(vcpu->kvm, irq);
+}
+
+static unsigned long vgic_mmio_read_v3r_ctlr(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len)
+{
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+ return vgic_cpu->lpis_enabled ? GICR_CTLR_ENABLE_LPIS : 0;
+}
+
+
+static void vgic_mmio_write_v3r_ctlr(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ bool was_enabled = vgic_cpu->lpis_enabled;
+
+ if (!vgic_has_its(vcpu->kvm))
+ return;
+
+ vgic_cpu->lpis_enabled = val & GICR_CTLR_ENABLE_LPIS;
+
+ if (!was_enabled && vgic_cpu->lpis_enabled)
+ vgic_enable_lpis(vcpu);
}
static unsigned long vgic_mmio_read_v3r_typer(struct kvm_vcpu *vcpu,
value |= ((target_vcpu_id & 0xffff) << 8);
if (target_vcpu_id == atomic_read(&vcpu->kvm->online_vcpus) - 1)
value |= GICR_TYPER_LAST;
+ if (vgic_has_its(vcpu->kvm))
+ value |= GICR_TYPER_PLPIS;
return extract_bytes(value, addr & 7, len);
}
return 0;
}
+/* We want to avoid outer shareable. */
+u64 vgic_sanitise_shareability(u64 field)
+{
+ switch (field) {
+ case GIC_BASER_OuterShareable:
+ return GIC_BASER_InnerShareable;
+ default:
+ return field;
+ }
+}
+
+/* Avoid any inner non-cacheable mapping. */
+u64 vgic_sanitise_inner_cacheability(u64 field)
+{
+ switch (field) {
+ case GIC_BASER_CACHE_nCnB:
+ case GIC_BASER_CACHE_nC:
+ return GIC_BASER_CACHE_RaWb;
+ default:
+ return field;
+ }
+}
+
+/* Non-cacheable or same-as-inner are OK. */
+u64 vgic_sanitise_outer_cacheability(u64 field)
+{
+ switch (field) {
+ case GIC_BASER_CACHE_SameAsInner:
+ case GIC_BASER_CACHE_nC:
+ return field;
+ default:
+ return GIC_BASER_CACHE_nC;
+ }
+}
+
+u64 vgic_sanitise_field(u64 reg, u64 field_mask, int field_shift,
+ u64 (*sanitise_fn)(u64))
+{
+ u64 field = (reg & field_mask) >> field_shift;
+
+ field = sanitise_fn(field) << field_shift;
+ return (reg & ~field_mask) | field;
+}
+
+#define PROPBASER_RES0_MASK \
+ (GENMASK_ULL(63, 59) | GENMASK_ULL(55, 52) | GENMASK_ULL(6, 5))
+#define PENDBASER_RES0_MASK \
+ (BIT_ULL(63) | GENMASK_ULL(61, 59) | GENMASK_ULL(55, 52) | \
+ GENMASK_ULL(15, 12) | GENMASK_ULL(6, 0))
+
+static u64 vgic_sanitise_pendbaser(u64 reg)
+{
+ reg = vgic_sanitise_field(reg, GICR_PENDBASER_SHAREABILITY_MASK,
+ GICR_PENDBASER_SHAREABILITY_SHIFT,
+ vgic_sanitise_shareability);
+ reg = vgic_sanitise_field(reg, GICR_PENDBASER_INNER_CACHEABILITY_MASK,
+ GICR_PENDBASER_INNER_CACHEABILITY_SHIFT,
+ vgic_sanitise_inner_cacheability);
+ reg = vgic_sanitise_field(reg, GICR_PENDBASER_OUTER_CACHEABILITY_MASK,
+ GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT,
+ vgic_sanitise_outer_cacheability);
+
+ reg &= ~PENDBASER_RES0_MASK;
+ reg &= ~GENMASK_ULL(51, 48);
+
+ return reg;
+}
+
+static u64 vgic_sanitise_propbaser(u64 reg)
+{
+ reg = vgic_sanitise_field(reg, GICR_PROPBASER_SHAREABILITY_MASK,
+ GICR_PROPBASER_SHAREABILITY_SHIFT,
+ vgic_sanitise_shareability);
+ reg = vgic_sanitise_field(reg, GICR_PROPBASER_INNER_CACHEABILITY_MASK,
+ GICR_PROPBASER_INNER_CACHEABILITY_SHIFT,
+ vgic_sanitise_inner_cacheability);
+ reg = vgic_sanitise_field(reg, GICR_PROPBASER_OUTER_CACHEABILITY_MASK,
+ GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT,
+ vgic_sanitise_outer_cacheability);
+
+ reg &= ~PROPBASER_RES0_MASK;
+ reg &= ~GENMASK_ULL(51, 48);
+ return reg;
+}
+
+static unsigned long vgic_mmio_read_propbase(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+ return extract_bytes(dist->propbaser, addr & 7, len);
+}
+
+static void vgic_mmio_write_propbase(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ u64 propbaser = dist->propbaser;
+
+ /* Storing a value with LPIs already enabled is undefined */
+ if (vgic_cpu->lpis_enabled)
+ return;
+
+ propbaser = update_64bit_reg(propbaser, addr & 4, len, val);
+ propbaser = vgic_sanitise_propbaser(propbaser);
+
+ dist->propbaser = propbaser;
+}
+
+static unsigned long vgic_mmio_read_pendbase(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len)
+{
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+ return extract_bytes(vgic_cpu->pendbaser, addr & 7, len);
+}
+
+static void vgic_mmio_write_pendbase(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ u64 pendbaser = vgic_cpu->pendbaser;
+
+ /* Storing a value with LPIs already enabled is undefined */
+ if (vgic_cpu->lpis_enabled)
+ return;
+
+ pendbaser = update_64bit_reg(pendbaser, addr & 4, len, val);
+ pendbaser = vgic_sanitise_pendbaser(pendbaser);
+
+ vgic_cpu->pendbaser = pendbaser;
+}
+
/*
* The GICv3 per-IRQ registers are split to control PPIs and SGIs in the
* redistributors, while SPIs are covered by registers in the distributor
static const struct vgic_register_region vgic_v3_rdbase_registers[] = {
REGISTER_DESC_WITH_LENGTH(GICR_CTLR,
- vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
+ vgic_mmio_read_v3r_ctlr, vgic_mmio_write_v3r_ctlr, 4,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_IIDR,
vgic_mmio_read_v3r_iidr, vgic_mmio_write_wi, 4,
vgic_mmio_read_v3r_typer, vgic_mmio_write_wi, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_PROPBASER,
- vgic_mmio_read_raz, vgic_mmio_write_wi, 8,
+ vgic_mmio_read_propbase, vgic_mmio_write_propbase, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_PENDBASER,
- vgic_mmio_read_raz, vgic_mmio_write_wi, 8,
+ vgic_mmio_read_pendbase, vgic_mmio_write_pendbase, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_IDREGS,
vgic_mmio_read_v3_idregs, vgic_mmio_write_wi, 48,
int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t redist_base_address)
{
- int nr_vcpus = atomic_read(&kvm->online_vcpus);
struct kvm_vcpu *vcpu;
- struct vgic_io_device *devices;
int c, ret = 0;
- devices = kmalloc(sizeof(struct vgic_io_device) * nr_vcpus * 2,
- GFP_KERNEL);
- if (!devices)
- return -ENOMEM;
-
kvm_for_each_vcpu(c, vcpu, kvm) {
gpa_t rd_base = redist_base_address + c * SZ_64K * 2;
gpa_t sgi_base = rd_base + SZ_64K;
- struct vgic_io_device *rd_dev = &devices[c * 2];
- struct vgic_io_device *sgi_dev = &devices[c * 2 + 1];
+ struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;
+ struct vgic_io_device *sgi_dev = &vcpu->arch.vgic_cpu.sgi_iodev;
kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops);
rd_dev->base_addr = rd_base;
+ rd_dev->iodev_type = IODEV_REDIST;
rd_dev->regions = vgic_v3_rdbase_registers;
rd_dev->nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers);
rd_dev->redist_vcpu = vcpu;
kvm_iodevice_init(&sgi_dev->dev, &kvm_io_gic_ops);
sgi_dev->base_addr = sgi_base;
+ sgi_dev->iodev_type = IODEV_REDIST;
sgi_dev->regions = vgic_v3_sgibase_registers;
sgi_dev->nr_regions = ARRAY_SIZE(vgic_v3_sgibase_registers);
sgi_dev->redist_vcpu = vcpu;
if (ret) {
/* The current c failed, so we start with the previous one. */
for (c--; c >= 0; c--) {
+ struct vgic_cpu *vgic_cpu;
+
+ vcpu = kvm_get_vcpu(kvm, c);
+ vgic_cpu = &vcpu->arch.vgic_cpu;
kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
- &devices[c * 2].dev);
+ &vgic_cpu->rd_iodev.dev);
kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
- &devices[c * 2 + 1].dev);
+ &vgic_cpu->sgi_iodev.dev);
}
- kfree(devices);
- } else {
- kvm->arch.vgic.redist_iodevs = devices;
}
return ret;
irq->pending = true;
vgic_queue_irq_unlock(vcpu->kvm, irq);
+ vgic_put_irq(vcpu->kvm, irq);
}
}
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