diff options
| -rw-r--r-- | include/kvm/arm_vgic.h | 2 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic-v2.c | 1 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic-v3.c | 76 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic.c | 14 |
4 files changed, 68 insertions, 25 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index b9b2e05..39039d5 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -134,6 +134,8 @@ struct vgic_params { /* Virtual control interface base address */ void __iomem *vctrl_base; int max_gic_vcpus; + /* Only needed for the legacy KVM_CREATE_IRQCHIP */ + bool can_emulate_gicv2; }; struct vgic_vm_ops { diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c index e8b82b28..a0a7b5d 100644 --- a/virt/kvm/arm/vgic-v2.c +++ b/virt/kvm/arm/vgic-v2.c @@ -229,6 +229,7 @@ int vgic_v2_probe(struct device_node *vgic_node, goto out_unmap; } + vgic->can_emulate_gicv2 = true; kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2); vgic->vcpu_base = vcpu_res.start; diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c index 5249048..3a62d8a 100644 --- a/virt/kvm/arm/vgic-v3.c +++ b/virt/kvm/arm/vgic-v3.c @@ -34,6 +34,7 @@ #define GICH_LR_VIRTUALID (0x3ffUL << 0) #define GICH_LR_PHYSID_CPUID_SHIFT (10) #define GICH_LR_PHYSID_CPUID (7UL << GICH_LR_PHYSID_CPUID_SHIFT) +#define ICH_LR_VIRTUALID_MASK (BIT_ULL(32) - 1) /* * LRs are stored in reverse order in memory. make sure we index them @@ -48,12 +49,17 @@ static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr) struct vgic_lr lr_desc; u64 val = vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[LR_INDEX(lr)]; - lr_desc.irq = val & GICH_LR_VIRTUALID; - if (lr_desc.irq <= 15) - lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7; + if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) + lr_desc.irq = val & ICH_LR_VIRTUALID_MASK; else - lr_desc.source = 0; - lr_desc.state = 0; + lr_desc.irq = val & GICH_LR_VIRTUALID; + + lr_desc.source = 0; + if (lr_desc.irq <= 15 && + vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2) + lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7; + + lr_desc.state = 0; if (val & ICH_LR_PENDING_BIT) lr_desc.state |= LR_STATE_PENDING; @@ -68,8 +74,20 @@ static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr) static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc) { - u64 lr_val = (((u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT) | - lr_desc.irq); + u64 lr_val; + + lr_val = lr_desc.irq; + + /* + * Currently all guest IRQs are Group1, as Group0 would result + * in a FIQ in the guest, which it wouldn't expect. + * Eventually we want to make this configurable, so we may revisit + * this in the future. + */ + if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) + lr_val |= ICH_LR_GROUP; + else + lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT; if (lr_desc.state & LR_STATE_PENDING) lr_val |= ICH_LR_PENDING_BIT; @@ -154,7 +172,15 @@ static void vgic_v3_enable(struct kvm_vcpu *vcpu) */ vgic_v3->vgic_vmcr = 0; - vgic_v3->vgic_sre = 0; + /* + * If we are emulating a GICv3, we do it in an non-GICv2-compatible + * way, so we force SRE to 1 to demonstrate this to the guest. + * This goes with the spec allowing the value to be RAO/WI. + */ + if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) + vgic_v3->vgic_sre = ICC_SRE_EL1_SRE; + else + vgic_v3->vgic_sre = 0; /* Get the show on the road... */ vgic_v3->vgic_hcr = ICH_HCR_EN; @@ -209,34 +235,34 @@ int vgic_v3_probe(struct device_node *vgic_node, * maximum of 16 list registers. Just ignore bit 4... */ vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1; + vgic->can_emulate_gicv2 = false; if (of_property_read_u32(vgic_node, "#redistributor-regions", &gicv_idx)) gicv_idx = 1; gicv_idx += 3; /* Also skip GICD, GICC, GICH */ if (of_address_to_resource(vgic_node, gicv_idx, &vcpu_res)) { - kvm_err("Cannot obtain GICV region\n"); - ret = -ENXIO; - goto out; - } - - if (!PAGE_ALIGNED(vcpu_res.start)) { - kvm_err("GICV physical address 0x%llx not page aligned\n", + kvm_info("GICv3: no GICV resource entry\n"); + vgic->vcpu_base = 0; + } else if (!PAGE_ALIGNED(vcpu_res.start)) { + pr_warn("GICV physical address 0x%llx not page aligned\n", (unsigned long long)vcpu_res.start); - ret = -ENXIO; - goto out; - } - - if (!PAGE_ALIGNED(resource_size(&vcpu_res))) { - kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n", + vgic->vcpu_base = 0; + } else if (!PAGE_ALIGNED(resource_size(&vcpu_res))) { + pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n", (unsigned long long)resource_size(&vcpu_res), PAGE_SIZE); - ret = -ENXIO; - goto out; + vgic->vcpu_base = 0; + } else { + vgic->vcpu_base = vcpu_res.start; + vgic->can_emulate_gicv2 = true; + kvm_register_device_ops(&kvm_arm_vgic_v2_ops, + KVM_DEV_TYPE_ARM_VGIC_V2); } - kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2); + if (vgic->vcpu_base == 0) + kvm_info("disabling GICv2 emulation\n"); + kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3); - vgic->vcpu_base = vcpu_res.start; vgic->vctrl_base = NULL; vgic->type = VGIC_V3; vgic->max_gic_vcpus = KVM_MAX_VCPUS; diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index 6d23e57..2efba82 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -1550,6 +1550,11 @@ static int init_vgic_model(struct kvm *kvm, int type) case KVM_DEV_TYPE_ARM_VGIC_V2: vgic_v2_init_emulation(kvm); break; +#ifdef CONFIG_ARM_GIC_V3 + case KVM_DEV_TYPE_ARM_VGIC_V3: + vgic_v3_init_emulation(kvm); + break; +#endif default: return -ENODEV; } @@ -1573,6 +1578,15 @@ int kvm_vgic_create(struct kvm *kvm, u32 type) } /* + * This function is also called by the KVM_CREATE_IRQCHIP handler, + * which had no chance yet to check the availability of the GICv2 + * emulation. So check this here again. KVM_CREATE_DEVICE does + * the proper checks already. + */ + if (type == KVM_DEV_TYPE_ARM_VGIC_V2 && !vgic->can_emulate_gicv2) + return -ENODEV; + + /* * Any time a vcpu is run, vcpu_load is called which tries to grab the * vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure * that no other VCPUs are run while we create the vgic. |
