/* * Copyright (C) 2013 ARM Limited, All Rights Reserved. * Author: Marc Zyngier <marc.zyngier@arm.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/cpu.h> #include <linux/kvm.h> #include <linux/kvm_host.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/irqchip/arm-gic-v3.h> #include <asm/kvm_emulate.h> #include <asm/kvm_arm.h> #include <asm/kvm_mmu.h> /* These are for GICv2 emulation only */ #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 * correctly. */ #define LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr) static u32 ich_vtr_el2; 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)]; if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) lr_desc.irq = val & ICH_LR_VIRTUALID_MASK; else 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; if (val & ICH_LR_ACTIVE_BIT) lr_desc.state |= LR_STATE_ACTIVE; if (val & ICH_LR_EOI) lr_desc.state |= LR_EOI_INT; if (val & ICH_LR_HW) { lr_desc.state |= LR_HW; lr_desc.hwirq = (val >> ICH_LR_PHYS_ID_SHIFT) & GENMASK(9, 0); } return lr_desc; } static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc) { 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. */ switch (vcpu->kvm->arch.vgic.vgic_model) { case KVM_DEV_TYPE_ARM_VGIC_V3: lr_val |= ICH_LR_GROUP; break; case KVM_DEV_TYPE_ARM_VGIC_V2: if (lr_desc.irq < VGIC_NR_SGIS) lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT; break; default: BUG(); } if (lr_desc.state & LR_STATE_PENDING) lr_val |= ICH_LR_PENDING_BIT; if (lr_desc.state & LR_STATE_ACTIVE) lr_val |= ICH_LR_ACTIVE_BIT; if (lr_desc.state & LR_EOI_INT) lr_val |= ICH_LR_EOI; if (lr_desc.state & LR_HW) { lr_val |= ICH_LR_HW; lr_val |= ((u64)lr_desc.hwirq) << ICH_LR_PHYS_ID_SHIFT; } vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[LR_INDEX(lr)] = lr_val; } static void vgic_v3_sync_lr_elrsr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc) { if (!(lr_desc.state & LR_STATE_MASK)) vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr |= (1U << lr); else vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr &= ~(1U << lr); } static u64 vgic_v3_get_elrsr(const struct kvm_vcpu *vcpu) { return vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr; } static u64 vgic_v3_get_eisr(const struct kvm_vcpu *vcpu) { return vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr; } static void vgic_v3_clear_eisr(struct kvm_vcpu *vcpu) { vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr = 0; } static u32 vgic_v3_get_interrupt_status(const struct kvm_vcpu *vcpu) { u32 misr = vcpu->arch.vgic_cpu.vgic_v3.vgic_misr; u32 ret = 0; if (misr & ICH_MISR_EOI) ret |= INT_STATUS_EOI; if (misr & ICH_MISR_U) ret |= INT_STATUS_UNDERFLOW; return ret; } static void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp) { u32 vmcr = vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr; vmcrp->ctlr = (vmcr & ICH_VMCR_CTLR_MASK) >> ICH_VMCR_CTLR_SHIFT; vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT; vmcrp->bpr = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT; vmcrp->pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT; } static void vgic_v3_enable_underflow(struct kvm_vcpu *vcpu) { vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr |= ICH_HCR_UIE; } static void vgic_v3_disable_underflow(struct kvm_vcpu *vcpu) { vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr &= ~ICH_HCR_UIE; } static void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp) { u32 vmcr; vmcr = (vmcrp->ctlr << ICH_VMCR_CTLR_SHIFT) & ICH_VMCR_CTLR_MASK; vmcr |= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK; vmcr |= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK; vmcr |= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK; vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr = vmcr; } static void vgic_v3_enable(struct kvm_vcpu *vcpu) { struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3; /* * By forcing VMCR to zero, the GIC will restore the binary * points to their reset values. Anything else resets to zero * anyway. */ vgic_v3->vgic_vmcr = 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; } static const struct vgic_ops vgic_v3_ops = { .get_lr = vgic_v3_get_lr, .set_lr = vgic_v3_set_lr, .sync_lr_elrsr = vgic_v3_sync_lr_elrsr, .get_elrsr = vgic_v3_get_elrsr, .get_eisr = vgic_v3_get_eisr, .clear_eisr = vgic_v3_clear_eisr, .get_interrupt_status = vgic_v3_get_interrupt_status, .enable_underflow = vgic_v3_enable_underflow, .disable_underflow = vgic_v3_disable_underflow, .get_vmcr = vgic_v3_get_vmcr, .set_vmcr = vgic_v3_set_vmcr, .enable = vgic_v3_enable, }; static struct vgic_params vgic_v3_params; /** * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT * @node: pointer to the DT node * @ops: address of a pointer to the GICv3 operations * @params: address of a pointer to HW-specific parameters * * Returns 0 if a GICv3 has been found, with the low level operations * in *ops and the HW parameters in *params. Returns an error code * otherwise. */ int vgic_v3_probe(struct device_node *vgic_node, const struct vgic_ops **ops, const struct vgic_params **params) { int ret = 0; u32 gicv_idx; struct resource vcpu_res; struct vgic_params *vgic = &vgic_v3_params; vgic->maint_irq = irq_of_parse_and_map(vgic_node, 0); if (!vgic->maint_irq) { kvm_err("error getting vgic maintenance irq from DT\n"); ret = -ENXIO; goto out; } ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2); /* * The ListRegs field is 5 bits, but there is a architectural * 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_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); 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); 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); } 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->vctrl_base = NULL; vgic->type = VGIC_V3; vgic->max_gic_vcpus = KVM_MAX_VCPUS; kvm_info("%s@%llx IRQ%d\n", vgic_node->name, vcpu_res.start, vgic->maint_irq); *ops = &vgic_v3_ops; *params = vgic; out: of_node_put(vgic_node); return ret; }