vgic.h

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2015, 2016 ARM Ltd.
 */
#ifndef __KVM_ARM_VGIC_NEW_H__
#define __KVM_ARM_VGIC_NEW_H__
 
#include <linux/irqchip/arm-gic-common.h>
#include <asm/kvm_mmu.h>
 
#define PRODUCT_ID_KVM      0x4b    /* ASCII code K */
#define IMPLEMENTER_ARM     0x43b
 
#define VGIC_ADDR_UNDEF     (-1)
#define IS_VGIC_ADDR_UNDEF(_x)  ((_x) == VGIC_ADDR_UNDEF)
 
#define INTERRUPT_ID_BITS_SPIS  10
#define INTERRUPT_ID_BITS_ITS   16
#define VGIC_PRI_BITS       5
 
#define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS)
 
#define VGIC_AFFINITY_0_SHIFT 0
#define VGIC_AFFINITY_0_MASK (0xffUL << VGIC_AFFINITY_0_SHIFT)
#define VGIC_AFFINITY_1_SHIFT 8
#define VGIC_AFFINITY_1_MASK (0xffUL << VGIC_AFFINITY_1_SHIFT)
#define VGIC_AFFINITY_2_SHIFT 16
#define VGIC_AFFINITY_2_MASK (0xffUL << VGIC_AFFINITY_2_SHIFT)
#define VGIC_AFFINITY_3_SHIFT 24
#define VGIC_AFFINITY_3_MASK (0xffUL << VGIC_AFFINITY_3_SHIFT)
 
#define VGIC_AFFINITY_LEVEL(reg, level) \
    ((((reg) & VGIC_AFFINITY_## level ##_MASK) \
    >> VGIC_AFFINITY_## level ##_SHIFT) << MPIDR_LEVEL_SHIFT(level))
 
/*
 * The Userspace encodes the affinity differently from the MPIDR,
 * Below macro converts vgic userspace format to MPIDR reg format.
 */
#define VGIC_TO_MPIDR(val) (VGIC_AFFINITY_LEVEL(val, 0) | \
                VGIC_AFFINITY_LEVEL(val, 1) | \
                VGIC_AFFINITY_LEVEL(val, 2) | \
                VGIC_AFFINITY_LEVEL(val, 3))
 
/*
 * As per Documentation/virt/kvm/devices/arm-vgic-v3.rst,
 * below macros are defined for CPUREG encoding.
 */
#define KVM_REG_ARM_VGIC_SYSREG_OP0_MASK   0x000000000000c000
#define KVM_REG_ARM_VGIC_SYSREG_OP0_SHIFT  14
#define KVM_REG_ARM_VGIC_SYSREG_OP1_MASK   0x0000000000003800
#define KVM_REG_ARM_VGIC_SYSREG_OP1_SHIFT  11
#define KVM_REG_ARM_VGIC_SYSREG_CRN_MASK   0x0000000000000780
#define KVM_REG_ARM_VGIC_SYSREG_CRN_SHIFT  7
#define KVM_REG_ARM_VGIC_SYSREG_CRM_MASK   0x0000000000000078
#define KVM_REG_ARM_VGIC_SYSREG_CRM_SHIFT  3
#define KVM_REG_ARM_VGIC_SYSREG_OP2_MASK   0x0000000000000007
#define KVM_REG_ARM_VGIC_SYSREG_OP2_SHIFT  0
 
#define KVM_DEV_ARM_VGIC_SYSREG_MASK (KVM_REG_ARM_VGIC_SYSREG_OP0_MASK | \
                      KVM_REG_ARM_VGIC_SYSREG_OP1_MASK | \
                      KVM_REG_ARM_VGIC_SYSREG_CRN_MASK | \
                      KVM_REG_ARM_VGIC_SYSREG_CRM_MASK | \
                      KVM_REG_ARM_VGIC_SYSREG_OP2_MASK)
 
/*
 * As per Documentation/virt/kvm/devices/arm-vgic-its.rst,
 * below macros are defined for ITS table entry encoding.
 */
#define KVM_ITS_CTE_VALID_SHIFT     63
#define KVM_ITS_CTE_VALID_MASK      BIT_ULL(63)
#define KVM_ITS_CTE_RDBASE_SHIFT    16
#define KVM_ITS_CTE_ICID_MASK       GENMASK_ULL(15, 0)
#define KVM_ITS_ITE_NEXT_SHIFT      48
#define KVM_ITS_ITE_PINTID_SHIFT    16
#define KVM_ITS_ITE_PINTID_MASK     GENMASK_ULL(47, 16)
#define KVM_ITS_ITE_ICID_MASK       GENMASK_ULL(15, 0)
#define KVM_ITS_DTE_VALID_SHIFT     63
#define KVM_ITS_DTE_VALID_MASK      BIT_ULL(63)
#define KVM_ITS_DTE_NEXT_SHIFT      49
#define KVM_ITS_DTE_NEXT_MASK       GENMASK_ULL(62, 49)
#define KVM_ITS_DTE_ITTADDR_SHIFT   5
#define KVM_ITS_DTE_ITTADDR_MASK    GENMASK_ULL(48, 5)
#define KVM_ITS_DTE_SIZE_MASK       GENMASK_ULL(4, 0)
#define KVM_ITS_L1E_VALID_MASK      BIT_ULL(63)
/* we only support 64 kB translation table page size */
#define KVM_ITS_L1E_ADDR_MASK       GENMASK_ULL(51, 16)
 
#define KVM_VGIC_V3_RDIST_INDEX_MASK    GENMASK_ULL(11, 0)
#define KVM_VGIC_V3_RDIST_FLAGS_MASK    GENMASK_ULL(15, 12)
#define KVM_VGIC_V3_RDIST_FLAGS_SHIFT   12
#define KVM_VGIC_V3_RDIST_BASE_MASK GENMASK_ULL(51, 16)
#define KVM_VGIC_V3_RDIST_COUNT_MASK    GENMASK_ULL(63, 52)
#define KVM_VGIC_V3_RDIST_COUNT_SHIFT   52
 
#ifdef CONFIG_DEBUG_SPINLOCK
#define DEBUG_SPINLOCK_BUG_ON(p) BUG_ON(p)
#else
#define DEBUG_SPINLOCK_BUG_ON(p)
#endif
 
static inline u32 vgic_get_implementation_rev(struct kvm_vcpu *vcpu)
{
    return vcpu->kvm->arch.vgic.implementation_rev;
}
 
/* Requires the irq_lock to be held by the caller. */
static inline bool irq_is_pending(struct vgic_irq *irq)
{
    if (irq->config == VGIC_CONFIG_EDGE)
        return irq->pending_latch;
    else
        return irq->pending_latch || irq->line_level;
}
 
static inline bool vgic_irq_is_mapped_level(struct vgic_irq *irq)
{
    return irq->config == VGIC_CONFIG_LEVEL && irq->hw;
}
 
static inline int vgic_irq_get_lr_count(struct vgic_irq *irq)
{
    /* Account for the active state as an interrupt */
    if (vgic_irq_is_sgi(irq->intid) && irq->source)
        return hweight8(irq->source) + irq->active;
 
    return irq_is_pending(irq) || irq->active;
}
 
static inline bool vgic_irq_is_multi_sgi(struct vgic_irq *irq)
{
    return vgic_irq_get_lr_count(irq) > 1;
}
 
static inline int vgic_write_guest_lock(struct kvm *kvm, gpa_t gpa,
                    const void *data, unsigned long len)
{
    struct vgic_dist *dist = &kvm->arch.vgic;
    int ret;
 
    dist->table_write_in_progress = true;
    ret = kvm_write_guest_lock(kvm, gpa, data, len);
    dist->table_write_in_progress = false;
 
    return ret;
}
 
/*
 * This struct provides an intermediate representation of the fields contained
 * in the GICH_VMCR and ICH_VMCR registers, such that code exporting the GIC
 * state to userspace can generate either GICv2 or GICv3 CPU interface
 * registers regardless of the hardware backed GIC used.
 */
struct vgic_vmcr {
    u32 grpen0;
    u32 grpen1;
 
    u32 ackctl;
    u32 fiqen;
    u32 cbpr;
    u32 eoim;
 
    u32 abpr;
    u32 bpr;
    u32 pmr;  /* Priority mask field in the GICC_PMR and
               * ICC_PMR_EL1 priority field format */
};
 
struct vgic_reg_attr {
    struct kvm_vcpu *vcpu;
    gpa_t addr;
};
 
int vgic_v3_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
               struct vgic_reg_attr *reg_attr);
int vgic_v2_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
               struct vgic_reg_attr *reg_attr);
const struct vgic_register_region *
vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
             gpa_t addr, int len);
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
                  u32 intid);
void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq);
void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq);
bool vgic_get_phys_line_level(struct vgic_irq *irq);
void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending);
void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active);
bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
               unsigned long flags);
void vgic_kick_vcpus(struct kvm *kvm);
void vgic_irq_handle_resampling(struct vgic_irq *irq,
                bool lr_deactivated, bool lr_pending);
 
int vgic_check_iorange(struct kvm *kvm, phys_addr_t ioaddr,
               phys_addr_t addr, phys_addr_t alignment,
               phys_addr_t size);
 
void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr);
void vgic_v2_set_underflow(struct kvm_vcpu *vcpu);
int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr);
int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
             int offset, u32 *val);
int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write,
              int offset, u32 *val);
void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_v2_enable(struct kvm_vcpu *vcpu);
int vgic_v2_probe(const struct gic_kvm_info *info);
int vgic_v2_map_resources(struct kvm *kvm);
int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
                 enum vgic_type);
 
void vgic_v2_init_lrs(void);
void vgic_v2_load(struct kvm_vcpu *vcpu);
void vgic_v2_put(struct kvm_vcpu *vcpu);
void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu);
 
void vgic_v2_save_state(struct kvm_vcpu *vcpu);
void vgic_v2_restore_state(struct kvm_vcpu *vcpu);
 
static inline void vgic_get_irq_kref(struct vgic_irq *irq)
{
    if (irq->intid < VGIC_MIN_LPI)
        return;
 
    kref_get(&irq->refcount);
}
 
void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu);
void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr);
void vgic_v3_set_underflow(struct kvm_vcpu *vcpu);
void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_v3_enable(struct kvm_vcpu *vcpu);
int vgic_v3_probe(const struct gic_kvm_info *info);
int vgic_v3_map_resources(struct kvm *kvm);
int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq);
int vgic_v3_save_pending_tables(struct kvm *kvm);
int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count);
int vgic_register_redist_iodev(struct kvm_vcpu *vcpu);
void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu);
bool vgic_v3_check_base(struct kvm *kvm);
 
void vgic_v3_load(struct kvm_vcpu *vcpu);
void vgic_v3_put(struct kvm_vcpu *vcpu);
void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu);
 
bool vgic_has_its(struct kvm *kvm);
int kvm_vgic_register_its_device(void);
void vgic_enable_lpis(struct kvm_vcpu *vcpu);
void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu);
int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi);
int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr);
int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
             int offset, u32 *val);
int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
             int offset, u32 *val);
int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu,
                struct kvm_device_attr *attr, bool is_write);
int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
                    u32 intid, u32 *val);
int kvm_register_vgic_device(unsigned long type);
void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
int vgic_lazy_init(struct kvm *kvm);
int vgic_init(struct kvm *kvm);
 
void vgic_debug_init(struct kvm *kvm);
void vgic_debug_destroy(struct kvm *kvm);
 
static inline int vgic_v3_max_apr_idx(struct kvm_vcpu *vcpu)
{
    struct vgic_cpu *cpu_if = &vcpu->arch.vgic_cpu;
 
    /*
     * num_pri_bits are initialized with HW supported values.
     * We can rely safely on num_pri_bits even if VM has not
     * restored ICC_CTLR_EL1 before restoring APnR registers.
     */
    switch (cpu_if->num_pri_bits) {
    case 7: return 3;
    case 6: return 1;
    default: return 0;
    }
}
 
static inline bool
vgic_v3_redist_region_full(struct vgic_redist_region *region)
{
    if (!region->count)
        return false;
 
    return (region->free_index >= region->count);
}
 
struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rdregs);
 
static inline size_t
vgic_v3_rd_region_size(struct kvm *kvm, struct vgic_redist_region *rdreg)
{
    if (!rdreg->count)
        return atomic_read(&kvm->online_vcpus) * KVM_VGIC_V3_REDIST_SIZE;
    else
        return rdreg->count * KVM_VGIC_V3_REDIST_SIZE;
}
 
struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
                               u32 index);
void vgic_v3_free_redist_region(struct vgic_redist_region *rdreg);
 
bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size);
 
static inline bool vgic_dist_overlap(struct kvm *kvm, gpa_t base, size_t size)
{
    struct vgic_dist *d = &kvm->arch.vgic;
 
    return (base + size > d->vgic_dist_base) &&
        (base < d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE);
}
 
bool vgic_lpis_enabled(struct kvm_vcpu *vcpu);
int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr);
int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
             u32 devid, u32 eventid, struct vgic_irq **irq);
struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi);
void vgic_lpi_translation_cache_init(struct kvm *kvm);
void vgic_lpi_translation_cache_destroy(struct kvm *kvm);
void vgic_its_invalidate_cache(struct kvm *kvm);
 
/* GICv4.1 MMIO interface */
int vgic_its_inv_lpi(struct kvm *kvm, struct vgic_irq *irq);
int vgic_its_invall(struct kvm_vcpu *vcpu);
 
bool vgic_supports_direct_msis(struct kvm *kvm);
int vgic_v4_init(struct kvm *kvm);
void vgic_v4_teardown(struct kvm *kvm);
void vgic_v4_configure_vsgis(struct kvm *kvm);
void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val);
int vgic_v4_request_vpe_irq(struct kvm_vcpu *vcpu, int irq);
 
#endif