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434 lines
12 KiB
434 lines
12 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2015, 2016 ARM Ltd. |
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*/ |
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#ifndef __KVM_ARM_VGIC_H |
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#define __KVM_ARM_VGIC_H |
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#include <linux/bits.h> |
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#include <linux/kvm.h> |
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#include <linux/irqreturn.h> |
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#include <linux/kref.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <linux/static_key.h> |
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#include <linux/types.h> |
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#include <kvm/iodev.h> |
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#include <linux/list.h> |
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#include <linux/jump_label.h> |
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#include <linux/irqchip/arm-gic-v4.h> |
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#define VGIC_V3_MAX_CPUS 512 |
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#define VGIC_V2_MAX_CPUS 8 |
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#define VGIC_NR_IRQS_LEGACY 256 |
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#define VGIC_NR_SGIS 16 |
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#define VGIC_NR_PPIS 16 |
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#define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS) |
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#define VGIC_MAX_PRIVATE (VGIC_NR_PRIVATE_IRQS - 1) |
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#define VGIC_MAX_SPI 1019 |
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#define VGIC_MAX_RESERVED 1023 |
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#define VGIC_MIN_LPI 8192 |
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#define KVM_IRQCHIP_NUM_PINS (1020 - 32) |
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#define irq_is_ppi(irq) ((irq) >= VGIC_NR_SGIS && (irq) < VGIC_NR_PRIVATE_IRQS) |
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#define irq_is_spi(irq) ((irq) >= VGIC_NR_PRIVATE_IRQS && \ |
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(irq) <= VGIC_MAX_SPI) |
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enum vgic_type { |
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VGIC_V2, /* Good ol' GICv2 */ |
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VGIC_V3, /* New fancy GICv3 */ |
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}; |
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/* same for all guests, as depending only on the _host's_ GIC model */ |
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struct vgic_global { |
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/* type of the host GIC */ |
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enum vgic_type type; |
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/* Physical address of vgic virtual cpu interface */ |
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phys_addr_t vcpu_base; |
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/* GICV mapping, kernel VA */ |
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void __iomem *vcpu_base_va; |
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/* GICV mapping, HYP VA */ |
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void __iomem *vcpu_hyp_va; |
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/* virtual control interface mapping, kernel VA */ |
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void __iomem *vctrl_base; |
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/* virtual control interface mapping, HYP VA */ |
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void __iomem *vctrl_hyp; |
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/* Number of implemented list registers */ |
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int nr_lr; |
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/* Maintenance IRQ number */ |
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unsigned int maint_irq; |
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/* maximum number of VCPUs allowed (GICv2 limits us to 8) */ |
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int max_gic_vcpus; |
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/* Only needed for the legacy KVM_CREATE_IRQCHIP */ |
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bool can_emulate_gicv2; |
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/* Hardware has GICv4? */ |
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bool has_gicv4; |
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bool has_gicv4_1; |
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/* Pseudo GICv3 from outer space */ |
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bool no_hw_deactivation; |
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/* GIC system register CPU interface */ |
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struct static_key_false gicv3_cpuif; |
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u32 ich_vtr_el2; |
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}; |
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extern struct vgic_global kvm_vgic_global_state; |
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#define VGIC_V2_MAX_LRS (1 << 6) |
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#define VGIC_V3_MAX_LRS 16 |
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#define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr) |
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enum vgic_irq_config { |
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VGIC_CONFIG_EDGE = 0, |
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VGIC_CONFIG_LEVEL |
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}; |
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/* |
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* Per-irq ops overriding some common behavious. |
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* |
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* Always called in non-preemptible section and the functions can use |
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* kvm_arm_get_running_vcpu() to get the vcpu pointer for private IRQs. |
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*/ |
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struct irq_ops { |
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/* Per interrupt flags for special-cased interrupts */ |
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unsigned long flags; |
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#define VGIC_IRQ_SW_RESAMPLE BIT(0) /* Clear the active state for resampling */ |
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/* |
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* Callback function pointer to in-kernel devices that can tell us the |
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* state of the input level of mapped level-triggered IRQ faster than |
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* peaking into the physical GIC. |
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*/ |
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bool (*get_input_level)(int vintid); |
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}; |
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struct vgic_irq { |
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raw_spinlock_t irq_lock; /* Protects the content of the struct */ |
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struct list_head lpi_list; /* Used to link all LPIs together */ |
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struct list_head ap_list; |
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struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU |
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* SPIs and LPIs: The VCPU whose ap_list |
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* this is queued on. |
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*/ |
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struct kvm_vcpu *target_vcpu; /* The VCPU that this interrupt should |
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* be sent to, as a result of the |
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* targets reg (v2) or the |
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* affinity reg (v3). |
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*/ |
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u32 intid; /* Guest visible INTID */ |
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bool line_level; /* Level only */ |
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bool pending_latch; /* The pending latch state used to calculate |
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* the pending state for both level |
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* and edge triggered IRQs. */ |
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bool active; /* not used for LPIs */ |
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bool enabled; |
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bool hw; /* Tied to HW IRQ */ |
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struct kref refcount; /* Used for LPIs */ |
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u32 hwintid; /* HW INTID number */ |
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unsigned int host_irq; /* linux irq corresponding to hwintid */ |
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union { |
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u8 targets; /* GICv2 target VCPUs mask */ |
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u32 mpidr; /* GICv3 target VCPU */ |
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}; |
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u8 source; /* GICv2 SGIs only */ |
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u8 active_source; /* GICv2 SGIs only */ |
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u8 priority; |
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u8 group; /* 0 == group 0, 1 == group 1 */ |
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enum vgic_irq_config config; /* Level or edge */ |
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struct irq_ops *ops; |
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void *owner; /* Opaque pointer to reserve an interrupt |
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for in-kernel devices. */ |
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}; |
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static inline bool vgic_irq_needs_resampling(struct vgic_irq *irq) |
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{ |
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return irq->ops && (irq->ops->flags & VGIC_IRQ_SW_RESAMPLE); |
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} |
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struct vgic_register_region; |
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struct vgic_its; |
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enum iodev_type { |
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IODEV_CPUIF, |
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IODEV_DIST, |
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IODEV_REDIST, |
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IODEV_ITS |
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}; |
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struct vgic_io_device { |
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gpa_t base_addr; |
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union { |
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struct kvm_vcpu *redist_vcpu; |
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struct vgic_its *its; |
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}; |
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const struct vgic_register_region *regions; |
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enum iodev_type iodev_type; |
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int nr_regions; |
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struct kvm_io_device dev; |
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}; |
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struct vgic_its { |
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/* The base address of the ITS control register frame */ |
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gpa_t vgic_its_base; |
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bool enabled; |
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struct vgic_io_device iodev; |
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struct kvm_device *dev; |
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/* These registers correspond to GITS_BASER{0,1} */ |
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u64 baser_device_table; |
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u64 baser_coll_table; |
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/* Protects the command queue */ |
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struct mutex cmd_lock; |
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u64 cbaser; |
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u32 creadr; |
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u32 cwriter; |
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/* migration ABI revision in use */ |
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u32 abi_rev; |
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/* Protects the device and collection lists */ |
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struct mutex its_lock; |
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struct list_head device_list; |
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struct list_head collection_list; |
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}; |
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struct vgic_state_iter; |
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struct vgic_redist_region { |
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u32 index; |
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gpa_t base; |
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u32 count; /* number of redistributors or 0 if single region */ |
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u32 free_index; /* index of the next free redistributor */ |
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struct list_head list; |
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}; |
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struct vgic_dist { |
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bool in_kernel; |
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bool ready; |
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bool initialized; |
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/* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */ |
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u32 vgic_model; |
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/* Implementation revision as reported in the GICD_IIDR */ |
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u32 implementation_rev; |
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#define KVM_VGIC_IMP_REV_2 2 /* GICv2 restorable groups */ |
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#define KVM_VGIC_IMP_REV_3 3 /* GICv3 GICR_CTLR.{IW,CES,RWP} */ |
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#define KVM_VGIC_IMP_REV_LATEST KVM_VGIC_IMP_REV_3 |
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/* Userspace can write to GICv2 IGROUPR */ |
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bool v2_groups_user_writable; |
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/* Do injected MSIs require an additional device ID? */ |
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bool msis_require_devid; |
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int nr_spis; |
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/* base addresses in guest physical address space: */ |
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gpa_t vgic_dist_base; /* distributor */ |
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union { |
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/* either a GICv2 CPU interface */ |
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gpa_t vgic_cpu_base; |
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/* or a number of GICv3 redistributor regions */ |
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struct list_head rd_regions; |
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}; |
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/* distributor enabled */ |
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bool enabled; |
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/* Wants SGIs without active state */ |
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bool nassgireq; |
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struct vgic_irq *spis; |
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struct vgic_io_device dist_iodev; |
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bool has_its; |
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/* |
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* Contains the attributes and gpa of the LPI configuration table. |
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* Since we report GICR_TYPER.CommonLPIAff as 0b00, we can share |
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* one address across all redistributors. |
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* GICv3 spec: IHI 0069E 6.1.1 "LPI Configuration tables" |
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*/ |
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u64 propbaser; |
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/* Protects the lpi_list and the count value below. */ |
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raw_spinlock_t lpi_list_lock; |
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struct list_head lpi_list_head; |
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int lpi_list_count; |
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/* LPI translation cache */ |
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struct list_head lpi_translation_cache; |
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/* used by vgic-debug */ |
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struct vgic_state_iter *iter; |
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/* |
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* GICv4 ITS per-VM data, containing the IRQ domain, the VPE |
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* array, the property table pointer as well as allocation |
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* data. This essentially ties the Linux IRQ core and ITS |
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* together, and avoids leaking KVM's data structures anywhere |
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* else. |
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*/ |
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struct its_vm its_vm; |
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}; |
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struct vgic_v2_cpu_if { |
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u32 vgic_hcr; |
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u32 vgic_vmcr; |
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u32 vgic_apr; |
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u32 vgic_lr[VGIC_V2_MAX_LRS]; |
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unsigned int used_lrs; |
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}; |
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struct vgic_v3_cpu_if { |
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u32 vgic_hcr; |
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u32 vgic_vmcr; |
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u32 vgic_sre; /* Restored only, change ignored */ |
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u32 vgic_ap0r[4]; |
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u32 vgic_ap1r[4]; |
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u64 vgic_lr[VGIC_V3_MAX_LRS]; |
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/* |
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* GICv4 ITS per-VPE data, containing the doorbell IRQ, the |
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* pending table pointer, the its_vm pointer and a few other |
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* HW specific things. As for the its_vm structure, this is |
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* linking the Linux IRQ subsystem and the ITS together. |
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*/ |
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struct its_vpe its_vpe; |
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unsigned int used_lrs; |
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}; |
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struct vgic_cpu { |
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/* CPU vif control registers for world switch */ |
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union { |
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struct vgic_v2_cpu_if vgic_v2; |
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struct vgic_v3_cpu_if vgic_v3; |
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}; |
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struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS]; |
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raw_spinlock_t ap_list_lock; /* Protects the ap_list */ |
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/* |
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* List of IRQs that this VCPU should consider because they are either |
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* Active or Pending (hence the name; AP list), or because they recently |
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* were one of the two and need to be migrated off this list to another |
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* VCPU. |
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*/ |
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struct list_head ap_list_head; |
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/* |
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* Members below are used with GICv3 emulation only and represent |
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* parts of the redistributor. |
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*/ |
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struct vgic_io_device rd_iodev; |
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struct vgic_redist_region *rdreg; |
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u32 rdreg_index; |
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atomic_t syncr_busy; |
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/* Contains the attributes and gpa of the LPI pending tables. */ |
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u64 pendbaser; |
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/* GICR_CTLR.{ENABLE_LPIS,RWP} */ |
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atomic_t ctlr; |
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/* Cache guest priority bits */ |
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u32 num_pri_bits; |
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/* Cache guest interrupt ID bits */ |
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u32 num_id_bits; |
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}; |
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extern struct static_key_false vgic_v2_cpuif_trap; |
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extern struct static_key_false vgic_v3_cpuif_trap; |
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int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev_addr); |
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void kvm_vgic_early_init(struct kvm *kvm); |
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int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu); |
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int kvm_vgic_create(struct kvm *kvm, u32 type); |
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void kvm_vgic_destroy(struct kvm *kvm); |
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void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu); |
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int kvm_vgic_map_resources(struct kvm *kvm); |
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int kvm_vgic_hyp_init(void); |
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void kvm_vgic_init_cpu_hardware(void); |
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int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, |
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bool level, void *owner); |
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int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq, |
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u32 vintid, struct irq_ops *ops); |
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int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid); |
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bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid); |
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int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu); |
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void kvm_vgic_load(struct kvm_vcpu *vcpu); |
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void kvm_vgic_put(struct kvm_vcpu *vcpu); |
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void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu); |
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#define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel)) |
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#define vgic_initialized(k) ((k)->arch.vgic.initialized) |
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#define vgic_ready(k) ((k)->arch.vgic.ready) |
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#define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \ |
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((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) |
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bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu); |
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void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu); |
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void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu); |
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void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid); |
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void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg, bool allow_group1); |
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/** |
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* kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW |
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* |
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* The host's GIC naturally limits the maximum amount of VCPUs a guest |
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* can use. |
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*/ |
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static inline int kvm_vgic_get_max_vcpus(void) |
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{ |
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return kvm_vgic_global_state.max_gic_vcpus; |
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} |
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/** |
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* kvm_vgic_setup_default_irq_routing: |
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* Setup a default flat gsi routing table mapping all SPIs |
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*/ |
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int kvm_vgic_setup_default_irq_routing(struct kvm *kvm); |
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int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner); |
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struct kvm_kernel_irq_routing_entry; |
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int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq, |
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struct kvm_kernel_irq_routing_entry *irq_entry); |
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int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq, |
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struct kvm_kernel_irq_routing_entry *irq_entry); |
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int vgic_v4_load(struct kvm_vcpu *vcpu); |
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void vgic_v4_commit(struct kvm_vcpu *vcpu); |
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int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db); |
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#endif /* __KVM_ARM_VGIC_H */
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