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* Copyright (C) 2015, 2016 ARM Ltd.
* 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
* 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 <>.
#ifndef __KVM_ARM_VGIC_H
#define __KVM_ARM_VGIC_H
#include <linux/kernel.h>
#include <linux/kvm.h>
#include <linux/irqreturn.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>
#define VGIC_V3_MAX_CPUS 255
#define VGIC_V2_MAX_CPUS 8
#define VGIC_NR_SGIS 16
#define VGIC_NR_PPIS 16
#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 */
void __iomem *vcpu_base_va;
/* virtual control interface mapping */
void __iomem *vctrl_base;
/* 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;
/* 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 {
struct vgic_irq {
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 */
union {
u8 targets; /* GICv2 target VCPUs mask */
u32 mpidr; /* GICv3 target VCPU */
u8 source; /* GICv2 SGIs only */
u8 priority;
enum vgic_irq_config config; /* Level or edge */
void *owner; /* Opaque pointer to reserve an interrupt
for in-kernel devices. */
struct vgic_register_region;
struct vgic_its;
enum iodev_type {
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_dist {
bool in_kernel;
bool ready;
bool initialized;
/* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
u32 vgic_model;
/* Do injected MSIs require an additional device ID? */
bool msis_require_devid;
int nr_spis;
/* TODO: Consider moving to global state */
/* Virtual control interface mapping */
void __iomem *vctrl_base;
/* 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 {
gpa_t vgic_redist_base;
gpa_t vgic_redist_free_offset;
/* distributor enabled */
bool enabled;
struct vgic_irq *spis;
struct vgic_io_device dist_iodev;
bool has_its;
* 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: 6.1.2 "LPI Configuration tables"
u64 propbaser;
/* Protects the lpi_list and the count value below. */
spinlock_t lpi_list_lock;
struct list_head lpi_list_head;
int lpi_list_count;
/* used by vgic-debug */
struct vgic_state_iter *iter;
struct vgic_v2_cpu_if {
u32 vgic_hcr;
u32 vgic_vmcr;
u64 vgic_elrsr; /* Saved only */
u32 vgic_apr;
u32 vgic_lr[VGIC_V2_MAX_LRS];
struct vgic_v3_cpu_if {
u32 vgic_hcr;
u32 vgic_vmcr;
u32 vgic_sre; /* Restored only, change ignored */
u32 vgic_elrsr; /* Saved only */
u32 vgic_ap0r[4];
u32 vgic_ap1r[4];
u64 vgic_lr[VGIC_V3_MAX_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;
unsigned int used_lrs;
struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
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
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_io_device sgi_iodev;
/* Contains the attributes and gpa of the LPI pending tables. */
u64 pendbaser;
bool lpis_enabled;
/* 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_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
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_early_init(struct kvm_vcpu *vcpu);
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, int cpuid, unsigned int intid,
bool level, void *owner);
int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq);
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);
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);
#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 vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
* 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;
int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
* 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);
#endif /* __KVM_ARM_VGIC_H */