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-rw-r--r--virt/kvm/arm/vgic-v2.c1
-rw-r--r--virt/kvm/arm/vgic-v3.c76
-rw-r--r--virt/kvm/arm/vgic.c14
3 files changed, 66 insertions, 25 deletions
diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
index e8b82b28984..a0a7b5d1a07 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 52490480b6f..3a62d8a9a2c 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 6d23e57c356..2efba823137 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.
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-13 09:43:32 +0000