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