// SPDX-License-Identifier: GPL-2.0-only

#include <linux/irqchip/arm-gic-v3.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <kvm/arm_vgic.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_asm.h>

#include "vgic.h"

static bool group0_trap;
static bool group1_trap;
static bool common_trap;
static bool gicv4_enable;

void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)
{
        struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;

        cpuif->vgic_hcr |= ICH_HCR_UIE;
}

static bool lr_signals_eoi_mi(u64 lr_val)
{
        return !(lr_val & ICH_LR_STATE) && (lr_val & ICH_LR_EOI) &&
               !(lr_val & ICH_LR_HW);
}

void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
{
        struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
        struct vgic_v3_cpu_if *cpuif = &vgic_cpu->vgic_v3;
        u32 model = vcpu->kvm->arch.vgic.vgic_model;
        int lr;

        DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());

        cpuif->vgic_hcr &= ~ICH_HCR_UIE;

        for (lr = 0; lr < cpuif->used_lrs; lr++) {
                u64 val = cpuif->vgic_lr[lr];
                u32 intid, cpuid;
                struct vgic_irq *irq;
                bool is_v2_sgi = false;

                cpuid = val & GICH_LR_PHYSID_CPUID;
                cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;

                if (model == KVM_DEV_TYPE_ARM_VGIC_V3) {
                        intid = val & ICH_LR_VIRTUAL_ID_MASK;
                } else {
                        intid = val & GICH_LR_VIRTUALID;
                        is_v2_sgi = vgic_irq_is_sgi(intid);
                }

                /* Notify fds when the guest EOI'ed a level-triggered IRQ */
                if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
                        kvm_notify_acked_irq(vcpu->kvm, 0,
                                             intid - VGIC_NR_PRIVATE_IRQS);

                irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
                if (!irq)       /* An LPI could have been unmapped. */
                        continue;

                raw_spin_lock(&irq->irq_lock);

                /* Always preserve the active bit */
                irq->active = !!(val & ICH_LR_ACTIVE_BIT);

                if (irq->active && is_v2_sgi)
                        irq->active_source = cpuid;

                /* Edge is the only case where we preserve the pending bit */
                if (irq->config == VGIC_CONFIG_EDGE &&
                    (val & ICH_LR_PENDING_BIT)) {
                        irq->pending_latch = true;

                        if (is_v2_sgi)
                                irq->source |= (1 << cpuid);
                }

                /*
                 * Clear soft pending state when level irqs have been acked.
                 */
                if (irq->config == VGIC_CONFIG_LEVEL && !(val & ICH_LR_STATE))
                        irq->pending_latch = false;

                /*
                 * Level-triggered mapped IRQs are special because we only
                 * observe rising edges as input to the VGIC.
                 *
                 * If the guest never acked the interrupt we have to sample
                 * the physical line and set the line level, because the
                 * device state could have changed or we simply need to
                 * process the still pending interrupt later.
                 *
                 * If this causes us to lower the level, we have to also clear
                 * the physical active state, since we will otherwise never be
                 * told when the interrupt becomes asserted again.
                 *
                 * Another case is when the interrupt requires a helping hand
                 * on deactivation (no HW deactivation, for example).
                 */
                if (vgic_irq_is_mapped_level(irq)) {
                        bool resample = false;

                        if (val & ICH_LR_PENDING_BIT) {
                                irq->line_level = vgic_get_phys_line_level(irq);
                                resample = !irq->line_level;
                        } else if (vgic_irq_needs_resampling(irq) &&
                                   !(irq->active || irq->pending_latch)) {
                                resample = true;
                        }

                        if (resample)
                                vgic_irq_set_phys_active(irq, false);
                }

                raw_spin_unlock(&irq->irq_lock);
                vgic_put_irq(vcpu->kvm, irq);
        }

        cpuif->used_lrs = 0;
}

/* Requires the irq to be locked already */
void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
{
        u32 model = vcpu->kvm->arch.vgic.vgic_model;
        u64 val = irq->intid;
        bool allow_pending = true, is_v2_sgi;

        is_v2_sgi = (vgic_irq_is_sgi(irq->intid) &&
                     model == KVM_DEV_TYPE_ARM_VGIC_V2);

        if (irq->active) {
                val |= ICH_LR_ACTIVE_BIT;
                if (is_v2_sgi)
                        val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
                if (vgic_irq_is_multi_sgi(irq)) {
                        allow_pending = false;
                        val |= ICH_LR_EOI;
                }
        }

        if (irq->hw && !vgic_irq_needs_resampling(irq)) {
                val |= ICH_LR_HW;
                val |= ((u64)irq->hwintid) << ICH_LR_PHYS_ID_SHIFT;
                /*
                 * Never set pending+active on a HW interrupt, as the
                 * pending state is kept at the physical distributor
                 * level.
                 */
                if (irq->active)
                        allow_pending = false;
        } else {
                if (irq->config == VGIC_CONFIG_LEVEL) {
                        val |= ICH_LR_EOI;

                        /*
                         * Software resampling doesn't work very well
                         * if we allow P+A, so let's not do that.
                         */
                        if (irq->active)
                                allow_pending = false;
                }
        }

        if (allow_pending && irq_is_pending(irq)) {
                val |= ICH_LR_PENDING_BIT;

                if (irq->config == VGIC_CONFIG_EDGE)
                        irq->pending_latch = false;

                if (vgic_irq_is_sgi(irq->intid) &&
                    model == KVM_DEV_TYPE_ARM_VGIC_V2) {
                        u32 src = ffs(irq->source);

                        if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n",
                                           irq->intid))
                                return;

                        val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
                        irq->source &= ~(1 << (src - 1));
                        if (irq->source) {
                                irq->pending_latch = true;
                                val |= ICH_LR_EOI;
                        }
                }
        }

        /*
         * Level-triggered mapped IRQs are special because we only observe
         * rising edges as input to the VGIC.  We therefore lower the line
         * level here, so that we can take new virtual IRQs.  See
         * vgic_v3_fold_lr_state for more info.
         */
        if (vgic_irq_is_mapped_level(irq) && (val & ICH_LR_PENDING_BIT))
                irq->line_level = false;

        if (irq->group)
                val |= ICH_LR_GROUP;

        val |= (u64)irq->priority << ICH_LR_PRIORITY_SHIFT;

        vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = val;
}

void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr)
{
        vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = 0;
}

void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
{
        struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
        u32 model = vcpu->kvm->arch.vgic.vgic_model;
        u32 vmcr;

        if (model == KVM_DEV_TYPE_ARM_VGIC_V2) {
                vmcr = (vmcrp->ackctl << ICH_VMCR_ACK_CTL_SHIFT) &
                        ICH_VMCR_ACK_CTL_MASK;
                vmcr |= (vmcrp->fiqen << ICH_VMCR_FIQ_EN_SHIFT) &
                        ICH_VMCR_FIQ_EN_MASK;
        } else {
                /*
                 * When emulating GICv3 on GICv3 with SRE=1 on the
                 * VFIQEn bit is RES1 and the VAckCtl bit is RES0.
                 */
                vmcr = ICH_VMCR_FIQ_EN_MASK;
        }

        vmcr |= (vmcrp->cbpr << ICH_VMCR_CBPR_SHIFT) & ICH_VMCR_CBPR_MASK;
        vmcr |= (vmcrp->eoim << ICH_VMCR_EOIM_SHIFT) & ICH_VMCR_EOIM_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;
        vmcr |= (vmcrp->grpen0 << ICH_VMCR_ENG0_SHIFT) & ICH_VMCR_ENG0_MASK;
        vmcr |= (vmcrp->grpen1 << ICH_VMCR_ENG1_SHIFT) & ICH_VMCR_ENG1_MASK;

        cpu_if->vgic_vmcr = vmcr;
}

void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
{
        struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
        u32 model = vcpu->kvm->arch.vgic.vgic_model;
        u32 vmcr;

        vmcr = cpu_if->vgic_vmcr;

        if (model == KVM_DEV_TYPE_ARM_VGIC_V2) {
                vmcrp->ackctl = (vmcr & ICH_VMCR_ACK_CTL_MASK) >>
                        ICH_VMCR_ACK_CTL_SHIFT;
                vmcrp->fiqen = (vmcr & ICH_VMCR_FIQ_EN_MASK) >>
                        ICH_VMCR_FIQ_EN_SHIFT;
        } else {
                /*
                 * When emulating GICv3 on GICv3 with SRE=1 on the
                 * VFIQEn bit is RES1 and the VAckCtl bit is RES0.
                 */
                vmcrp->fiqen = 1;
                vmcrp->ackctl = 0;
        }

        vmcrp->cbpr = (vmcr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT;
        vmcrp->eoim = (vmcr & ICH_VMCR_EOIM_MASK) >> ICH_VMCR_EOIM_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;
        vmcrp->grpen0 = (vmcr & ICH_VMCR_ENG0_MASK) >> ICH_VMCR_ENG0_SHIFT;
        vmcrp->grpen1 = (vmcr & ICH_VMCR_ENG1_MASK) >> ICH_VMCR_ENG1_SHIFT;
}

#define INITIAL_PENDBASER_VALUE                                           \
        (GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWb)            | \
        GIC_BASER_CACHEABILITY(GICR_PENDBASER, OUTER, SameAsInner)      | \
        GIC_BASER_SHAREABILITY(GICR_PENDBASER, InnerShareable))

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.
         * Also, we don't support any form of IRQ/FIQ bypass.
         * 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_DIB |
                                     ICC_SRE_EL1_DFB |
                                     ICC_SRE_EL1_SRE);
                vcpu->arch.vgic_cpu.pendbaser = INITIAL_PENDBASER_VALUE;
        } else {
                vgic_v3->vgic_sre = 0;
        }

        vcpu->arch.vgic_cpu.num_id_bits = (kvm_vgic_global_state.ich_vtr_el2 &
                                           ICH_VTR_ID_BITS_MASK) >>
                                           ICH_VTR_ID_BITS_SHIFT;
        vcpu->arch.vgic_cpu.num_pri_bits = ((kvm_vgic_global_state.ich_vtr_el2 &
                                            ICH_VTR_PRI_BITS_MASK) >>
                                            ICH_VTR_PRI_BITS_SHIFT) + 1;

        /* Get the show on the road... */
        vgic_v3->vgic_hcr = ICH_HCR_EN;
        if (group0_trap)
                vgic_v3->vgic_hcr |= ICH_HCR_TALL0;
        if (group1_trap)
                vgic_v3->vgic_hcr |= ICH_HCR_TALL1;
        if (common_trap)
                vgic_v3->vgic_hcr |= ICH_HCR_TC;
}

int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
{
        struct kvm_vcpu *vcpu;
        int byte_offset, bit_nr;
        gpa_t pendbase, ptr;
        bool status;
        u8 val;
        int ret;
        unsigned long flags;

retry:
        vcpu = irq->target_vcpu;
        if (!vcpu)
                return 0;

        pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);

        byte_offset = irq->intid / BITS_PER_BYTE;
        bit_nr = irq->intid % BITS_PER_BYTE;
        ptr = pendbase + byte_offset;

        ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
        if (ret)
                return ret;

        status = val & (1 << bit_nr);

        raw_spin_lock_irqsave(&irq->irq_lock, flags);
        if (irq->target_vcpu != vcpu) {
                raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
                goto retry;
        }
        irq->pending_latch = status;
        vgic_queue_irq_unlock(vcpu->kvm, irq, flags);

        if (status) {
                /* clear consumed data */
                val &= ~(1 << bit_nr);
                ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
                if (ret)
                        return ret;
        }
        return 0;
}

/*
 * The deactivation of the doorbell interrupt will trigger the
 * unmapping of the associated vPE.
 */
static void unmap_all_vpes(struct vgic_dist *dist)
{
        struct irq_desc *desc;
        int i;

        for (i = 0; i < dist->its_vm.nr_vpes; i++) {
                desc = irq_to_desc(dist->its_vm.vpes[i]->irq);
                irq_domain_deactivate_irq(irq_desc_get_irq_data(desc));
        }
}

static void map_all_vpes(struct vgic_dist *dist)
{
        struct irq_desc *desc;
        int i;

        for (i = 0; i < dist->its_vm.nr_vpes; i++) {
                desc = irq_to_desc(dist->its_vm.vpes[i]->irq);
                irq_domain_activate_irq(irq_desc_get_irq_data(desc), false);
        }
}

/**
 * vgic_v3_save_pending_tables - Save the pending tables into guest RAM
 * kvm lock and all vcpu lock must be held
 */
int vgic_v3_save_pending_tables(struct kvm *kvm)
{
        struct vgic_dist *dist = &kvm->arch.vgic;
        struct vgic_irq *irq;
        gpa_t last_ptr = ~(gpa_t)0;
        bool vlpi_avail = false;
        int ret = 0;
        u8 val;

        if (unlikely(!vgic_initialized(kvm)))
                return -ENXIO;

        /*
         * A preparation for getting any VLPI states.
         * The above vgic initialized check also ensures that the allocation
         * and enabling of the doorbells have already been done.
         */
        if (kvm_vgic_global_state.has_gicv4_1) {
                unmap_all_vpes(dist);
                vlpi_avail = true;
        }

        list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
                int byte_offset, bit_nr;
                struct kvm_vcpu *vcpu;
                gpa_t pendbase, ptr;
                bool is_pending;
                bool stored;

                vcpu = irq->target_vcpu;
                if (!vcpu)
                        continue;

                pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);

                byte_offset = irq->intid / BITS_PER_BYTE;
                bit_nr = irq->intid % BITS_PER_BYTE;
                ptr = pendbase + byte_offset;

                if (ptr != last_ptr) {
                        ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
                        if (ret)
                                goto out;
                        last_ptr = ptr;
                }

                stored = val & (1U << bit_nr);

                is_pending = irq->pending_latch;

                if (irq->hw && vlpi_avail)
                        vgic_v4_get_vlpi_state(irq, &is_pending);

                if (stored == is_pending)
                        continue;

                if (is_pending)
                        val |= 1 << bit_nr;
                else
                        val &= ~(1 << bit_nr);

                ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
                if (ret)
                        goto out;
        }

out:
        if (vlpi_avail)
                map_all_vpes(dist);

        return ret;
}

/**
 * vgic_v3_rdist_overlap - check if a region overlaps with any
 * existing redistributor region
 *
 * @kvm: kvm handle
 * @base: base of the region
 * @size: size of region
 *
 * Return: true if there is an overlap
 */
bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size)
{
        struct vgic_dist *d = &kvm->arch.vgic;
        struct vgic_redist_region *rdreg;

        list_for_each_entry(rdreg, &d->rd_regions, list) {
                if ((base + size > rdreg->base) &&
                        (base < rdreg->base + vgic_v3_rd_region_size(kvm, rdreg)))
                        return true;
        }
        return false;
}

/*
 * Check for overlapping regions and for regions crossing the end of memory
 * for base addresses which have already been set.
 */
bool vgic_v3_check_base(struct kvm *kvm)
{
        struct vgic_dist *d = &kvm->arch.vgic;
        struct vgic_redist_region *rdreg;

        if (!IS_VGIC_ADDR_UNDEF(d->vgic_dist_base) &&
            d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE < d->vgic_dist_base)
                return false;

        list_for_each_entry(rdreg, &d->rd_regions, list) {
                if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) <
                        rdreg->base)
                        return false;
        }

        if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base))
                return true;

        return !vgic_v3_rdist_overlap(kvm, d->vgic_dist_base,
                                      KVM_VGIC_V3_DIST_SIZE);
}

/**
 * vgic_v3_rdist_free_slot - Look up registered rdist regions and identify one
 * which has free space to put a new rdist region.
 *
 * @rd_regions: redistributor region list head
 *
 * A redistributor regions maps n redistributors, n = region size / (2 x 64kB).
 * Stride between redistributors is 0 and regions are filled in the index order.
 *
 * Return: the redist region handle, if any, that has space to map a new rdist
 * region.
 */
struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rd_regions)
{
        struct vgic_redist_region *rdreg;

        list_for_each_entry(rdreg, rd_regions, list) {
                if (!vgic_v3_redist_region_full(rdreg))
                        return rdreg;
        }
        return NULL;
}

struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
                                                           u32 index)
{
        struct list_head *rd_regions = &kvm->arch.vgic.rd_regions;
        struct vgic_redist_region *rdreg;

        list_for_each_entry(rdreg, rd_regions, list) {
                if (rdreg->index == index)
                        return rdreg;
        }
        return NULL;
}


int vgic_v3_map_resources(struct kvm *kvm)
{
        struct vgic_dist *dist = &kvm->arch.vgic;
        struct kvm_vcpu *vcpu;
        int ret = 0;
        int c;

        kvm_for_each_vcpu(c, vcpu, kvm) {
                struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;

                if (IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr)) {
                        kvm_debug("vcpu %d redistributor base not set\n", c);
                        return -ENXIO;
                }
        }

        if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base)) {
                kvm_err("Need to set vgic distributor addresses first\n");
                return -ENXIO;
        }

        if (!vgic_v3_check_base(kvm)) {
                kvm_err("VGIC redist and dist frames overlap\n");
                return -EINVAL;
        }

        /*
         * For a VGICv3 we require the userland to explicitly initialize
         * the VGIC before we need to use it.
         */
        if (!vgic_initialized(kvm)) {
                return -EBUSY;
        }

        ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V3);
        if (ret) {
                kvm_err("Unable to register VGICv3 dist MMIO regions\n");
                return ret;
        }

        if (kvm_vgic_global_state.has_gicv4_1)
                vgic_v4_configure_vsgis(kvm);

        return 0;
}

DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap);

static int __init early_group0_trap_cfg(char *buf)
{
        return strtobool(buf, &group0_trap);
}
early_param("kvm-arm.vgic_v3_group0_trap", early_group0_trap_cfg);

static int __init early_group1_trap_cfg(char *buf)
{
        return strtobool(buf, &group1_trap);
}
early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg);

static int __init early_common_trap_cfg(char *buf)
{
        return strtobool(buf, &common_trap);
}
early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg);

static int __init early_gicv4_enable(char *buf)
{
        return strtobool(buf, &gicv4_enable);
}
early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);

/**
 * vgic_v3_probe - probe for a VGICv3 compatible interrupt controller
 * @info:       pointer to the GIC description
 *
 * Returns 0 if the VGICv3 has been probed successfully, returns an error code
 * otherwise
 */
int vgic_v3_probe(const struct gic_kvm_info *info)
{
        u64 ich_vtr_el2 = kvm_call_hyp_ret(__vgic_v3_get_gic_config);
        bool has_v2;
        int ret;

        has_v2 = ich_vtr_el2 >> 63;
        ich_vtr_el2 = (u32)ich_vtr_el2;

        /*
         * The ListRegs field is 5 bits, but there is an architectural
         * maximum of 16 list registers. Just ignore bit 4...
         */
        kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1;
        kvm_vgic_global_state.can_emulate_gicv2 = false;
        kvm_vgic_global_state.ich_vtr_el2 = ich_vtr_el2;

        /* GICv4 support? */
        if (info->has_v4) {
                kvm_vgic_global_state.has_gicv4 = gicv4_enable;
                kvm_vgic_global_state.has_gicv4_1 = info->has_v4_1 && gicv4_enable;
                kvm_info("GICv4%s support %sabled\n",
                         kvm_vgic_global_state.has_gicv4_1 ? ".1" : "",
                         gicv4_enable ? "en" : "dis");
        }

        kvm_vgic_global_state.vcpu_base = 0;

        if (!info->vcpu.start) {
                kvm_info("GICv3: no GICV resource entry\n");
        } else if (!has_v2) {
                pr_warn(FW_BUG "CPU interface incapable of MMIO access\n");
        } else if (!PAGE_ALIGNED(info->vcpu.start)) {
                pr_warn("GICV physical address 0x%llx not page aligned\n",
                        (unsigned long long)info->vcpu.start);
        } else {
                kvm_vgic_global_state.vcpu_base = info->vcpu.start;
                kvm_vgic_global_state.can_emulate_gicv2 = true;
                ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
                if (ret) {
                        kvm_err("Cannot register GICv2 KVM device.\n");
                        return ret;
                }
                kvm_info("vgic-v2@%llx\n", info->vcpu.start);
        }
        ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3);
        if (ret) {
                kvm_err("Cannot register GICv3 KVM device.\n");
                kvm_unregister_device_ops(KVM_DEV_TYPE_ARM_VGIC_V2);
                return ret;
        }

        if (kvm_vgic_global_state.vcpu_base == 0)
                kvm_info("disabling GICv2 emulation\n");

        if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_30115)) {
                group0_trap = true;
                group1_trap = true;
        }

        if (group0_trap || group1_trap || common_trap) {
                kvm_info("GICv3 sysreg trapping enabled ([%s%s%s], reduced performance)\n",
                         group0_trap ? "G0" : "",
                         group1_trap ? "G1" : "",
                         common_trap ? "C"  : "");
                static_branch_enable(&vgic_v3_cpuif_trap);
        }

        kvm_vgic_global_state.vctrl_base = NULL;
        kvm_vgic_global_state.type = VGIC_V3;
        kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS;

        return 0;
}

void vgic_v3_load(struct kvm_vcpu *vcpu)
{
        struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;

        /*
         * If dealing with a GICv2 emulation on GICv3, VMCR_EL2.VFIQen
         * is dependent on ICC_SRE_EL1.SRE, and we have to perform the
         * VMCR_EL2 save/restore in the world switch.
         */
        if (likely(cpu_if->vgic_sre))
                kvm_call_hyp(__vgic_v3_write_vmcr, cpu_if->vgic_vmcr);

        kvm_call_hyp(__vgic_v3_restore_aprs, cpu_if);

        if (has_vhe())
                __vgic_v3_activate_traps(cpu_if);

        WARN_ON(vgic_v4_load(vcpu));
}

void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
{
        struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;

        if (likely(cpu_if->vgic_sre))
                cpu_if->vgic_vmcr = kvm_call_hyp_ret(__vgic_v3_read_vmcr);
}

void vgic_v3_put(struct kvm_vcpu *vcpu)
{
        struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;

        WARN_ON(vgic_v4_put(vcpu, false));

        vgic_v3_vmcr_sync(vcpu);

        kvm_call_hyp(__vgic_v3_save_aprs, cpu_if);

        if (has_vhe())
                __vgic_v3_deactivate_traps(cpu_if);
}