qemu/hw/arm/smmuv3.c

/*
 * Copyright (C) 2014-2016 Broadcom Corporation
 * Copyright (c) 2017 Red Hat, Inc.
 * Written by Prem Mallappa, Eric Auger
 *
 * 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * 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 <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "qemu/bitops.h"
#include "hw/irq.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-core.h"
#include "hw/pci/pci.h"
#include "cpu.h"
#include "trace.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "qapi/error.h"

#include "hw/arm/smmuv3.h"
#include "smmuv3-internal.h"
#include "smmu-internal.h"

#define PTW_RECORD_FAULT(ptw_info, cfg) (((ptw_info).stage == SMMU_STAGE_1 && \
                                        (cfg)->record_faults) || \
                                        ((ptw_info).stage == SMMU_STAGE_2 && \
                                        (cfg)->s2cfg.record_faults))

/**
 * smmuv3_trigger_irq - pulse @irq if enabled and update
 * GERROR register in case of GERROR interrupt
 *
 * @irq: irq type
 * @gerror_mask: mask of gerrors to toggle (relevant if @irq is GERROR)
 */
static void smmuv3_trigger_irq(SMMUv3State *s, SMMUIrq irq,
                               uint32_t gerror_mask)
{

    bool pulse = false;

    switch (irq) {
    case SMMU_IRQ_EVTQ:
        pulse = smmuv3_eventq_irq_enabled(s);
        break;
    case SMMU_IRQ_PRIQ:
        qemu_log_mask(LOG_UNIMP, "PRI not yet supported\n");
        break;
    case SMMU_IRQ_CMD_SYNC:
        pulse = true;
        break;
    case SMMU_IRQ_GERROR:
    {
        uint32_t pending = s->gerror ^ s->gerrorn;
        uint32_t new_gerrors = ~pending & gerror_mask;

        if (!new_gerrors) {
            /* only toggle non pending errors */
            return;
        }
        s->gerror ^= new_gerrors;
        trace_smmuv3_write_gerror(new_gerrors, s->gerror);

        pulse = smmuv3_gerror_irq_enabled(s);
        break;
    }
    }
    if (pulse) {
            trace_smmuv3_trigger_irq(irq);
            qemu_irq_pulse(s->irq[irq]);
    }
}

static void smmuv3_write_gerrorn(SMMUv3State *s, uint32_t new_gerrorn)
{
    uint32_t pending = s->gerror ^ s->gerrorn;
    uint32_t toggled = s->gerrorn ^ new_gerrorn;

    if (toggled & ~pending) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "guest toggles non pending errors = 0x%x\n",
                      toggled & ~pending);
    }

    /*
     * We do not raise any error in case guest toggles bits corresponding
     * to not active IRQs (CONSTRAINED UNPREDICTABLE)
     */
    s->gerrorn = new_gerrorn;

    trace_smmuv3_write_gerrorn(toggled & pending, s->gerrorn);
}

static inline MemTxResult queue_read(SMMUQueue *q, Cmd *cmd)
{
    dma_addr_t addr = Q_CONS_ENTRY(q);
    MemTxResult ret;
    int i;

    ret = dma_memory_read(&address_space_memory, addr, cmd, sizeof(Cmd),
                          MEMTXATTRS_UNSPECIFIED);
    if (ret != MEMTX_OK) {
        return ret;
    }
    for (i = 0; i < ARRAY_SIZE(cmd->word); i++) {
        le32_to_cpus(&cmd->word[i]);
    }
    return ret;
}

static MemTxResult queue_write(SMMUQueue *q, Evt *evt_in)
{
    dma_addr_t addr = Q_PROD_ENTRY(q);
    MemTxResult ret;
    Evt evt = *evt_in;
    int i;

    for (i = 0; i < ARRAY_SIZE(evt.word); i++) {
        cpu_to_le32s(&evt.word[i]);
    }
    ret = dma_memory_write(&address_space_memory, addr, &evt, sizeof(Evt),
                           MEMTXATTRS_UNSPECIFIED);
    if (ret != MEMTX_OK) {
        return ret;
    }

    queue_prod_incr(q);
    return MEMTX_OK;
}

static MemTxResult smmuv3_write_eventq(SMMUv3State *s, Evt *evt)
{
    SMMUQueue *q = &s->eventq;
    MemTxResult r;

    if (!smmuv3_eventq_enabled(s)) {
        return MEMTX_ERROR;
    }

    if (smmuv3_q_full(q)) {
        return MEMTX_ERROR;
    }

    r = queue_write(q, evt);
    if (r != MEMTX_OK) {
        return r;
    }

    if (!smmuv3_q_empty(q)) {
        smmuv3_trigger_irq(s, SMMU_IRQ_EVTQ, 0);
    }
    return MEMTX_OK;
}

void smmuv3_record_event(SMMUv3State *s, SMMUEventInfo *info)
{
    Evt evt = {};
    MemTxResult r;

    if (!smmuv3_eventq_enabled(s)) {
        return;
    }

    EVT_SET_TYPE(&evt, info->type);
    EVT_SET_SID(&evt, info->sid);

    switch (info->type) {
    case SMMU_EVT_NONE:
        return;
    case SMMU_EVT_F_UUT:
        EVT_SET_SSID(&evt, info->u.f_uut.ssid);
        EVT_SET_SSV(&evt,  info->u.f_uut.ssv);
        EVT_SET_ADDR(&evt, info->u.f_uut.addr);
        EVT_SET_RNW(&evt,  info->u.f_uut.rnw);
        EVT_SET_PNU(&evt,  info->u.f_uut.pnu);
        EVT_SET_IND(&evt,  info->u.f_uut.ind);
        break;
    case SMMU_EVT_C_BAD_STREAMID:
        EVT_SET_SSID(&evt, info->u.c_bad_streamid.ssid);
        EVT_SET_SSV(&evt,  info->u.c_bad_streamid.ssv);
        break;
    case SMMU_EVT_F_STE_FETCH:
        EVT_SET_SSID(&evt, info->u.f_ste_fetch.ssid);
        EVT_SET_SSV(&evt,  info->u.f_ste_fetch.ssv);
        EVT_SET_ADDR2(&evt, info->u.f_ste_fetch.addr);
        break;
    case SMMU_EVT_C_BAD_STE:
        EVT_SET_SSID(&evt, info->u.c_bad_ste.ssid);
        EVT_SET_SSV(&evt,  info->u.c_bad_ste.ssv);
        break;
    case SMMU_EVT_F_STREAM_DISABLED:
        break;
    case SMMU_EVT_F_TRANS_FORBIDDEN:
        EVT_SET_ADDR(&evt, info->u.f_transl_forbidden.addr);
        EVT_SET_RNW(&evt, info->u.f_transl_forbidden.rnw);
        break;
    case SMMU_EVT_C_BAD_SUBSTREAMID:
        EVT_SET_SSID(&evt, info->u.c_bad_substream.ssid);
        break;
    case SMMU_EVT_F_CD_FETCH:
        EVT_SET_SSID(&evt, info->u.f_cd_fetch.ssid);
        EVT_SET_SSV(&evt,  info->u.f_cd_fetch.ssv);
        EVT_SET_ADDR(&evt, info->u.f_cd_fetch.addr);
        break;
    case SMMU_EVT_C_BAD_CD:
        EVT_SET_SSID(&evt, info->u.c_bad_cd.ssid);
        EVT_SET_SSV(&evt,  info->u.c_bad_cd.ssv);
        break;
    case SMMU_EVT_F_WALK_EABT:
    case SMMU_EVT_F_TRANSLATION:
    case SMMU_EVT_F_ADDR_SIZE:
    case SMMU_EVT_F_ACCESS:
    case SMMU_EVT_F_PERMISSION:
        EVT_SET_STALL(&evt, info->u.f_walk_eabt.stall);
        EVT_SET_STAG(&evt, info->u.f_walk_eabt.stag);
        EVT_SET_SSID(&evt, info->u.f_walk_eabt.ssid);
        EVT_SET_SSV(&evt, info->u.f_walk_eabt.ssv);
        EVT_SET_S2(&evt, info->u.f_walk_eabt.s2);
        EVT_SET_ADDR(&evt, info->u.f_walk_eabt.addr);
        EVT_SET_RNW(&evt, info->u.f_walk_eabt.rnw);
        EVT_SET_PNU(&evt, info->u.f_walk_eabt.pnu);
        EVT_SET_IND(&evt, info->u.f_walk_eabt.ind);
        EVT_SET_CLASS(&evt, info->u.f_walk_eabt.class);
        EVT_SET_ADDR2(&evt, info->u.f_walk_eabt.addr2);
        break;
    case SMMU_EVT_F_CFG_CONFLICT:
        EVT_SET_SSID(&evt, info->u.f_cfg_conflict.ssid);
        EVT_SET_SSV(&evt,  info->u.f_cfg_conflict.ssv);
        break;
    /* rest is not implemented */
    case SMMU_EVT_F_BAD_ATS_TREQ:
    case SMMU_EVT_F_TLB_CONFLICT:
    case SMMU_EVT_E_PAGE_REQ:
    default:
        g_assert_not_reached();
    }

    trace_smmuv3_record_event(smmu_event_string(info->type), info->sid);
    r = smmuv3_write_eventq(s, &evt);
    if (r != MEMTX_OK) {
        smmuv3_trigger_irq(s, SMMU_IRQ_GERROR, R_GERROR_EVENTQ_ABT_ERR_MASK);
    }
    info->recorded = true;
}

static void smmuv3_init_regs(SMMUv3State *s)
{
    /* Based on sys property, the stages supported in smmu will be advertised.*/
    if (s->stage && !strcmp("2", s->stage)) {
        s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S2P, 1);
    } else if (s->stage && !strcmp("nested", s->stage)) {
        s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S1P, 1);
        s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S2P, 1);
    } else {
        s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S1P, 1);
    }

    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, TTF, 2); /* AArch64 PTW only */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, COHACC, 1); /* IO coherent */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, ASID16, 1); /* 16-bit ASID */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, VMID16, 1); /* 16-bit VMID */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, TTENDIAN, 2); /* little endian */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, STALL_MODEL, 1); /* No stall */
    /* terminated transaction will always be aborted/error returned */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, TERM_MODEL, 1);
    /* 2-level stream table supported */
    s->idr[0] = FIELD_DP32(s->idr[0], IDR0, STLEVEL, 1);

    s->idr[1] = FIELD_DP32(s->idr[1], IDR1, SIDSIZE, SMMU_IDR1_SIDSIZE);
    s->idr[1] = FIELD_DP32(s->idr[1], IDR1, EVENTQS, SMMU_EVENTQS);
    s->idr[1] = FIELD_DP32(s->idr[1], IDR1, CMDQS,   SMMU_CMDQS);

    s->idr[3] = FIELD_DP32(s->idr[3], IDR3, HAD, 1);
    if (FIELD_EX32(s->idr[0], IDR0, S2P)) {
        /* XNX is a stage-2-specific feature */
        s->idr[3] = FIELD_DP32(s->idr[3], IDR3, XNX, 1);
    }
    s->idr[3] = FIELD_DP32(s->idr[3], IDR3, RIL, 1);
    s->idr[3] = FIELD_DP32(s->idr[3], IDR3, BBML, 2);

    s->idr[5] = FIELD_DP32(s->idr[5], IDR5, OAS, SMMU_IDR5_OAS); /* 44 bits */
    /* 4K, 16K and 64K granule support */
    s->idr[5] = FIELD_DP32(s->idr[5], IDR5, GRAN4K, 1);
    s->idr[5] = FIELD_DP32(s->idr[5], IDR5, GRAN16K, 1);
    s->idr[5] = FIELD_DP32(s->idr[5], IDR5, GRAN64K, 1);

    s->cmdq.base = deposit64(s->cmdq.base, 0, 5, SMMU_CMDQS);
    s->cmdq.prod = 0;
    s->cmdq.cons = 0;
    s->cmdq.entry_size = sizeof(struct Cmd);
    s->eventq.base = deposit64(s->eventq.base, 0, 5, SMMU_EVENTQS);
    s->eventq.prod = 0;
    s->eventq.cons = 0;
    s->eventq.entry_size = sizeof(struct Evt);

    s->features = 0;
    s->sid_split = 0;
    s->aidr = 0x1;
    s->cr[0] = 0;
    s->cr0ack = 0;
    s->irq_ctrl = 0;
    s->gerror = 0;
    s->gerrorn = 0;
    s->statusr = 0;
    s->gbpa = SMMU_GBPA_RESET_VAL;
}

static int smmu_get_ste(SMMUv3State *s, dma_addr_t addr, STE *buf,
                        SMMUEventInfo *event)
{
    int ret, i;

    trace_smmuv3_get_ste(addr);
    /* TODO: guarantee 64-bit single-copy atomicity */
    ret = dma_memory_read(&address_space_memory, addr, buf, sizeof(*buf),
                          MEMTXATTRS_UNSPECIFIED);
    if (ret != MEMTX_OK) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "Cannot fetch pte at address=0x%"PRIx64"\n", addr);
        event->type = SMMU_EVT_F_STE_FETCH;
        event->u.f_ste_fetch.addr = addr;
        return -EINVAL;
    }
    for (i = 0; i < ARRAY_SIZE(buf->word); i++) {
        le32_to_cpus(&buf->word[i]);
    }
    return 0;

}

static SMMUTranslationStatus smmuv3_do_translate(SMMUv3State *s, hwaddr addr,
                                                 SMMUTransCfg *cfg,
                                                 SMMUEventInfo *event,
                                                 IOMMUAccessFlags flag,
                                                 SMMUTLBEntry **out_entry,
                                                 SMMUTranslationClass class);
/* @ssid > 0 not supported yet */
static int smmu_get_cd(SMMUv3State *s, STE *ste, SMMUTransCfg *cfg,
                       uint32_t ssid, CD *buf, SMMUEventInfo *event)
{
    dma_addr_t addr = STE_CTXPTR(ste);
    int ret, i;
    SMMUTranslationStatus status;
    SMMUTLBEntry *entry;

    trace_smmuv3_get_cd(addr);

    if (cfg->stage == SMMU_NESTED) {
        status = smmuv3_do_translate(s, addr, cfg, event,
                                     IOMMU_RO, &entry, SMMU_CLASS_CD);

        /* Same PTW faults are reported but with CLASS = CD. */
        if (status != SMMU_TRANS_SUCCESS) {
            return -EINVAL;
        }

        addr = CACHED_ENTRY_TO_ADDR(entry, addr);
    }

    /* TODO: guarantee 64-bit single-copy atomicity */
    ret = dma_memory_read(&address_space_memory, addr, buf, sizeof(*buf),
                          MEMTXATTRS_UNSPECIFIED);
    if (ret != MEMTX_OK) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "Cannot fetch pte at address=0x%"PRIx64"\n", addr);
        event->type = SMMU_EVT_F_CD_FETCH;
        event->u.f_cd_fetch.addr = addr;
        return -EINVAL;
    }
    for (i = 0; i < ARRAY_SIZE(buf->word); i++) {
        le32_to_cpus(&buf->word[i]);
    }
    return 0;
}

/*
 * Max valid value is 39 when SMMU_IDR3.STT == 0.
 * In architectures after SMMUv3.0:
 * - If STE.S2TG selects a 4KB or 16KB granule, the minimum valid value for this
 *   field is MAX(16, 64-IAS)
 * - If STE.S2TG selects a 64KB granule, the minimum valid value for this field
 *   is (64-IAS).
 * As we only support AA64, IAS = OAS.
 */
static bool s2t0sz_valid(SMMUTransCfg *cfg)
{
    if (cfg->s2cfg.tsz > 39) {
        return false;
    }

    if (cfg->s2cfg.granule_sz == 16) {
        return (cfg->s2cfg.tsz >= 64 - cfg->s2cfg.eff_ps);
    }

    return (cfg->s2cfg.tsz >= MAX(64 - cfg->s2cfg.eff_ps, 16));
}

/*
 * Return true if s2 page table config is valid.
 * This checks with the configured start level, ias_bits and granularity we can
 * have a valid page table as described in ARM ARM D8.2 Translation process.
 * The idea here is to see for the highest possible number of IPA bits, how
 * many concatenated tables we would need, if it is more than 16, then this is
 * not possible.
 */
static bool s2_pgtable_config_valid(uint8_t sl0, uint8_t t0sz, uint8_t gran)
{
    int level = get_start_level(sl0, gran);
    uint64_t ipa_bits = 64 - t0sz;
    uint64_t max_ipa = (1ULL << ipa_bits) - 1;
    int nr_concat = pgd_concat_idx(level, gran, max_ipa) + 1;

    return nr_concat <= VMSA_MAX_S2_CONCAT;
}

static int decode_ste_s2_cfg(SMMUv3State *s, SMMUTransCfg *cfg,
                             STE *ste)
{
    uint8_t oas = FIELD_EX32(s->idr[5], IDR5, OAS);

    if (STE_S2AA64(ste) == 0x0) {
        qemu_log_mask(LOG_UNIMP,
                      "SMMUv3 AArch32 tables not supported\n");
        g_assert_not_reached();
    }

    switch (STE_S2TG(ste)) {
    case 0x0: /* 4KB */
        cfg->s2cfg.granule_sz = 12;
        break;
    case 0x1: /* 64KB */
        cfg->s2cfg.granule_sz = 16;
        break;
    case 0x2: /* 16KB */
        cfg->s2cfg.granule_sz = 14;
        break;
    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "SMMUv3 bad STE S2TG: %x\n", STE_S2TG(ste));
        goto bad_ste;
    }

    cfg->s2cfg.vttb = STE_S2TTB(ste);

    cfg->s2cfg.sl0 = STE_S2SL0(ste);
    /* FEAT_TTST not supported. */
    if (cfg->s2cfg.sl0 == 0x3) {
        qemu_log_mask(LOG_UNIMP, "SMMUv3 S2SL0 = 0x3 has no meaning!\n");
        goto bad_ste;
    }

    /* For AA64, The effective S2PS size is capped to the OAS. */
    cfg->s2cfg.eff_ps = oas2bits(MIN(STE_S2PS(ste), oas));
    /*
     * For SMMUv3.1 and later, when OAS == IAS == 52, the stage 2 input
     * range is further limited to 48 bits unless STE.S2TG indicates a
     * 64KB granule.
     */
    if (cfg->s2cfg.granule_sz != 16) {
        cfg->s2cfg.eff_ps = MIN(cfg->s2cfg.eff_ps, 48);
    }
    /*
     * It is ILLEGAL for the address in S2TTB to be outside the range
     * described by the effective S2PS value.
     */
    if (cfg->s2cfg.vttb & ~(MAKE_64BIT_MASK(0, cfg->s2cfg.eff_ps))) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "SMMUv3 S2TTB too large 0x%" PRIx64
                      ", effective PS %d bits\n",
                      cfg->s2cfg.vttb,  cfg->s2cfg.eff_ps);
        goto bad_ste;
    }

    cfg->s2cfg.tsz = STE_S2T0SZ(ste);

    if (!s2t0sz_valid(cfg)) {
        qemu_log_mask(LOG_GUEST_ERROR, "SMMUv3 bad STE S2T0SZ = %d\n",
                      cfg->s2cfg.tsz);
        goto bad_ste;
    }

    if (!s2_pgtable_config_valid(cfg->s2cfg.sl0, cfg->s2cfg.tsz,
                                    cfg->s2cfg.granule_sz)) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "SMMUv3 STE stage 2 config not valid!\n");
        goto bad_ste;
    }

    /* Only LE supported(IDR0.TTENDIAN). */
    if (STE_S2ENDI(ste)) {
        qemu_log_mask(LOG_GUEST_ERROR,
                      "SMMUv3 STE_S2ENDI only supports LE!\n");
        goto bad_ste;
    }

    cfg->s2cfg.affd = STE_S2AFFD(ste);

    cfg->s2cfg.record_faults = STE_S2R(ste);
    /* As stall is not supported. */
    if (STE_S2S(ste)) {
        qemu_log_mask(LOG_UNIMP, "SMMUv3 Stall not implemented!\n");
        goto bad_ste;
    }

    return 0;

bad_ste:
    return -EINVAL;
}

static void decode_ste_config(SMMUTransCfg *cfg, uint32_t config)
{

    if (STE_CFG_ABORT(config)) {
        cfg->aborted = true;
        return;
    }
    if (STE_CFG_BYPASS(config)) {
        cfg->bypassed = true;
        return;
    }

    if (STE_CFG_S1_ENABLED(config)) {
        cfg->stage = SMMU_STAGE_1;
    }

    if (STE_CFG_S2_ENABLED(config)) {
        cfg->stage |= SMMU_STAGE_2;
    }
}

/* Returns < 0 in case of invalid STE, 0 otherwise */
static int decode_ste(SMMUv3State *s, SMMUTransCfg *cfg,
                      STE *ste, SMMUEventInfo *event)
{
    uint32_t config;
    uint8_t oas = FIELD_EX32(s->idr[5], IDR5, OAS);
    int ret;

    if (!STE_VALID(ste)) {
        if (!event->inval_ste_allowed) {
            qemu_log_mask(LOG_GUEST_ERROR, "invalid STE\n");
        }
        goto bad_ste;
    }

    config = STE_CONFIG(ste);

    decode_ste_config(cfg, config);

    if (cfg->aborted || cfg->bypassed) {
        return 0;
    }

    /*
     * If a stage is enabled in SW while not advertised, throw bad ste
     * according to user manual(IHI0070E) "5.2 Stream Table Entry".
     */
    if (!STAGE1_SUPPORTED(s) && STE_CFG_S1_ENABLED(config)) {
        qemu_log_mask(LOG_GUEST_ERROR, "SMMUv3 S1 used but not supported.\n");
        goto bad_ste;
    }
    if (!STAGE2_SUPPORTED(s) && STE_CFG_S2_ENABLED(config)) {
        qemu_log_mask(LOG_GUEST_ERROR, "SMMUv3 S2 used but not supported.\n");
        goto bad_ste;
    }

    if (STAGE2_SUPPORTED(s)) {
        /* VMID is considered even if s2 is disabled. */
        cfg->s2cfg.vmid = STE_S2VMID(ste);
    } else {
        /* Default to -1 */
        cfg->s2cfg.vmid = -1;
    }

    if (STE_CFG_S2_ENABLED(config)) {
        /*
         * Stage-1 OAS defaults to OAS even if not enabled as it would be used
         * in input address check for stage-2.
         */
        cfg->oas = oas2bits(oas);
        ret = decode_ste_s2_cfg(s, cfg, ste);
        if (ret) {
            goto bad_ste;
        }
    }

    if (STE_S1CDMAX(ste) != 0) {
        qemu_log_mask(LOG_UNIMP,
                      "SMMUv3 does not support multiple context descriptors yet\n");
        goto bad_ste;
    }

    if (STE_S1STALLD(ste)) {
        qemu_log_mask(LOG_UNIMP,
                      "SMMUv3 S1 stalling fault model not allowed yet\n");
        goto bad_ste;
    }
    return 0;

bad_ste:
    event->type = SMMU_EVT_C_BAD_STE;
    return -EINVAL;
}

/**
 * smmu_find_ste - Return the stream table entry associated
 * to the sid
 *
 * @s: smmuv3 handle
 * @sid: stream ID
 * @ste: returned stream table entry
 * @event: handle to an event info
 *
 * Supports linear and 2-level stream table
 * Return 0 on success, -EINVAL otherwise
 */
static int smmu_find_ste(SMMUv3State *s, uint32_t sid, STE *ste,
                         SMMUEventInfo *event)
{
    dma_addr_t addr, strtab_base;
    uint32_t log2size;
    int strtab_size_shift;
    int ret;

    trace_smmuv3_find_ste(sid, s->features, s->sid_split);
    log2size = FIELD_EX32(s->strtab_base_cfg, STRTAB_BASE_CFG, LOG2SIZE);
    /*
     * Check SID range against both guest-configured and implementation limits
     */
    if (sid >= (1 << MIN(log2size, SMMU_IDR1_SIDSIZE))) {
        event->type = SMMU_EVT_C_BAD_STREAMID;
        return -EINVAL;
    }
    if (s->features & SMMU_FEATURE_2LVL_STE) {
        int l1_ste_offset, l2_ste_offset, max_l2_ste, span, i;
        dma_addr_t l1ptr, l2ptr;
        STEDesc l1std;

        /*
         * Align strtab base address to table size. For this purpose, assume it
         * is not bounded by SMMU_IDR1_SIDSIZE.
         */
        strtab_size_shift = MAX(5, (int)log2size - s->sid_split - 1 + 3);
        strtab_base = s->strtab_base & SMMU_BASE_ADDR_MASK &
                      ~MAKE_64BIT_MASK(0, strtab_size_shift);
        l1_ste_offset = sid >> s->sid_split;
        l2_ste_offset = sid & ((1 << s->sid_split) - 1);
        l1ptr = (dma_addr_t)(strtab_base + l1_ste_offset * sizeof(l1std));
        /* TODO: guarantee 64-bit single-copy atomicity */
        ret = dma_memory_read(&address_space_memory, l1ptr, &l1std,
                              sizeof(l1std), MEMTXATTRS_UNSPECIFIED);
        if (ret != MEMTX_OK) {
            qemu_log_mask(LOG_GUEST_ERROR,
                          "Could not read L1PTR at 0X%"PRIx64"\n", l1ptr);
            event->type = SMMU_EVT_F_STE_FETCH;
            event->u.f_ste_fetch.addr = l1ptr;
            return -EINVAL;
        }
        for (i = 0; i < ARRAY_SIZE(l1std.word); i++) {
            le32_to_cpus(&l1std.word[i]);
        }

        span = L1STD_SPAN(&l1std);

        if (!span) {
            /* l2ptr is not valid */
            if (!event->inval_ste_allowed) {
                qemu_log_mask(LOG_GUEST_ERROR,
                              "invalid sid=%d (L1STD span=0)\n", sid);
            }
            event->type = SMMU_EVT_C_BAD_STREAMID;
            return -EINVAL;
        }
        max_l2_ste = (1 << span) - 1;
        l2ptr = l1std_l2ptr(&l1std);
        trace_smmuv3_find_ste_2lvl(s->strtab_base, l1ptr, l1_ste_offset,
                                   l2ptr, l2_ste_offset, max_l2_ste);
        if (l2_ste_offset > max_l2_ste) {
            qemu_log_mask(LOG_GUEST_ERROR,
                          "l2_ste_offset=%d > max_l2_ste=%d\n",
                          l2_ste_offset, max_l2_ste);
            event->type = SMMU_EVT_C_BAD_STE;
            return -EINVAL;
        }
        addr = l2ptr + l2_ste_offset * sizeof(*ste);
    } else {
        strtab_size_shift = log2size + 5;
        strtab_base = s->strtab_base & SMMU_BASE_ADDR_MASK &
                      ~MAKE_64BIT_MASK(0, strtab_size_shift);
        addr = strtab_base + sid * sizeof(*ste);
    }

    if (smmu_get_ste(s, addr, ste, event)) {
        return -EINVAL;
    }

    return 0;
}

static int decode_cd(SMMUv3State *s, SMMUTransCfg *cfg,
                     CD *cd, SMMUEventInfo *event)
{
    int ret = -EINVAL;
    int i;
    SMMUTranslationStatus status;
    SMMUTLBEntry *entry;
    uint8_t oas = FIELD_EX32(s->idr[5], IDR5, OAS);

    if (!CD_VALID(cd) || !CD_AARCH64(cd)) {
        goto bad_cd;
    }
    if (!CD_A(cd)) {
        goto bad_cd; /* SMMU_IDR0.TERM_MODEL == 1 */
    }
    if (CD_S(cd)) {
        goto bad_cd; /* !STE_SECURE && SMMU_IDR0.STALL_MODEL == 1 */
    }
    if (CD_HA(cd) || CD_HD(cd)) {
        goto bad_cd; /* HTTU = 0 */
    }

    /* we support only those at the moment */
    cfg->aa64 = true;

    cfg->oas = oas2bits(CD_IPS(cd));
    cfg->oas = MIN(oas2bits(oas), cfg->oas);
    cfg->tbi = CD_TBI(cd);
    cfg->asid = CD_ASID(cd);
    cfg->affd = CD_AFFD(cd);

    trace_smmuv3_decode_cd(cfg->oas);

    /* decode data dependent on TT */
    for (i = 0; i <= 1; i++) {
        int tg, tsz;
        SMMUTransTableInfo *tt = &cfg->tt[i];

        cfg->tt[i].disabled = CD_EPD(cd, i);
        if (cfg->tt[i].disabled) {
            continue;
        }

        tsz = CD_TSZ(cd, i);
        if (tsz < 16 || tsz > 39) {
            goto bad_cd;
        }

        tg = CD_TG(cd, i);
        tt->granule_sz = tg2granule(tg, i);
        if ((tt->granule_sz != 12 && tt->granule_sz != 14 &&
             tt->granule_sz != 16) || CD_ENDI(cd)) {
            goto bad_cd;
        }

        /*
         * An address greater than 48 bits in size can only be output from a
         * TTD when, in SMMUv3.1 and later, the effective IPS is 52 and a 64KB
         * granule is in use for that translation table
         */
        if (tt->granule_sz != 16) {
            cfg->oas = MIN(cfg->oas, 48);
        }
        tt->tsz = tsz;
        tt->ttb = CD_TTB(cd, i);

        if (tt->ttb & ~(MAKE_64BIT_MASK(0, cfg->oas))) {
            goto bad_cd;
        }

        /* Translate the TTBx, from IPA to PA if nesting is enabled. */
        if (cfg->stage == SMMU_NESTED) {
            status = smmuv3_do_translate(s, tt->ttb, cfg, event, IOMMU_RO,
                                         &entry, SMMU_CLASS_TT);
            /*
             * Same PTW faults are reported but with CLASS = TT.
             * If TTBx is larger than the effective stage 1 output addres
             * size, it reports C_BAD_CD, which is handled by the above case.
             */
            if (status != SMMU_TRANS_SUCCESS) {
                return -EINVAL;
            }
            tt->ttb = CACHED_ENTRY_TO_ADDR(entry, tt->ttb);
        }

        tt->had = CD_HAD(cd, i);
        trace_smmuv3_decode_cd_tt(i, tt->tsz, tt->ttb, tt->granule_sz, tt->had);
    }

    cfg->record_faults = CD_R(cd);

    return 0;

bad_cd:
    event->type = SMMU_EVT_C_BAD_CD;
    return ret;
}

/**
 * smmuv3_decode_config - Prepare the translation configuration
 * for the @mr iommu region
 * @mr: iommu memory region the translation config must be prepared for
 * @cfg: output translation configuration which is populated through
 *       the different configuration decoding steps
 * @event: must be zero'ed by the caller
 *
 * return < 0 in case of config decoding error (@event is filled
 * accordingly). Return 0 otherwise.
 */
static int smmuv3_decode_config(IOMMUMemoryRegion *mr, SMMUTransCfg *cfg,
                                SMMUEventInfo *event)
{
    SMMUDevice *sdev = container_of(mr, SMMUDevice, iommu);
    uint32_t sid = smmu_get_sid(sdev);
    SMMUv3State *s = sdev->smmu;
    int ret;
    STE ste;
    CD cd;

    /* ASID defaults to -1 (if s1 is not supported). */
    cfg->asid = -1;

    ret = smmu_find_ste(s, sid, &ste, event);
    if (ret) {
        return ret;
    }

    ret = decode_ste(s, cfg, &ste, event);
    if (ret) {
        return ret;
    }

    if (cfg->aborted || cfg->bypassed || (cfg->stage == SMMU_STAGE_2)) {
        return 0;
    }

    ret = smmu_get_cd(s, &ste, cfg, 0 /* ssid */, &cd, event);
    if (ret) {
        return ret;
    }

    return decode_cd(s, cfg, &cd, event);
}

/**
 * smmuv3_get_config - Look up for a cached copy of configuration data for
 * @sdev and on cache miss performs a configuration structure decoding from
 * guest RAM.
 *
 * @sdev: SMMUDevice handle
 * @event: output event info
 *
 * The configuration cache contains data resulting from both STE and CD
 * decoding under the form of an SMMUTransCfg struct. The hash table is indexed
 * by the SMMUDevice handle.
 */
static SMMUTransCfg *smmuv3_get_config(SMMUDevice *sdev, SMMUEventInfo *event)
{
    SMMUv3State *s = sdev->smmu;
    SMMUState *bc = &s->smmu_state;
    SMMUTransCfg *cfg;

    cfg = g_hash_table_lookup(bc->configs, sdev);
    if (cfg) {
        sdev->cfg_cache_hits++;
        trace_smmuv3_config_cache_hit(smmu_get_sid(sdev),
                            sdev->cfg_cache_hits, sdev->cfg_cache_misses,
                            100 * sdev->cfg_cache_hits /
                            (sdev->cfg_cache_hits + sdev->cfg_cache_misses));
    } else {
        sdev->cfg_cache_misses++;
        trace_smmuv3_config_cache_miss(smmu_get_sid(sdev),
                            sdev->cfg_cache_hits, sdev->cfg_cache_misses,
                            100 * sdev->cfg_cache_hits /
                            (sdev->cfg_cache_hits + sdev->cfg_cache_misses));
        cfg = g_new0(SMMUTransCfg, 1);

        if (!smmuv3_decode_config(&sdev->iommu, cfg, event)) {
            g_hash_table_insert(bc->configs, sdev, cfg);
        } else {
            g_free(cfg);
            cfg = NULL;
        }
    }
    return cfg;
}

static void smmuv3_flush_config(SMMUDevice *sdev)
{
    SMMUv3State *s = sdev->smmu;
    SMMUState *bc = &s->smmu_state;

    trace_smmu_config_cache_inv(smmu_get_sid(sdev));
    g_hash_table_remove(bc->configs, sdev);
}

/* Do translation with TLB lookup. */
static SMMUTranslationStatus smmuv3_do_translate(SMMUv3State *s, hwaddr addr,
                                                 SMMUTransCfg *cfg,
                                                 SMMUEventInfo *event,
                                                 IOMMUAccessFlags flag,
                                                 SMMUTLBEntry **out_entry,
                                                 SMMUTranslationClass class)
{
    SMMUPTWEventInfo ptw_info = {};
    SMMUState *bs = ARM_SMMU(s);
    SMMUTLBEntry *cached_entry = NULL;
    int asid, stage;
    bool desc_s2_translation = class != SMMU_CLASS_IN;

    /*
     * The function uses the argument class to identify which stage is used:
     * - CLASS = IN: Means an input translation, determine the stage from STE.
     * - CLASS = CD: Means the addr is an IPA of the CD, and it would be
     *   translated using the stage-2.
     * - CLASS = TT: Means the addr is an IPA of the stage-1 translation table
     *   and it would be translated using the stage-2.
     * For the last 2 cases instead of having intrusive changes in the common
     * logic, we modify the cfg to be a stage-2 translation only in case of
     * nested, and then restore it after.
     */
    if (desc_s2_translation) {
        asid = cfg->asid;
        stage = cfg->stage;
        cfg->asid = -1;
        cfg->stage = SMMU_STAGE_2;
    }

    cached_entry = smmu_translate(bs, cfg, addr, flag, &ptw_info);

    if (desc_s2_translation) {
        cfg->asid = asid;
        cfg->stage = stage;
    }

    if (!cached_entry) {
        /* All faults from PTW has S2 field. */
        event->u.f_walk_eabt.s2 = (ptw_info.stage == SMMU_STAGE_2);
        /*
         * Fault class is set as follows based on "class" input to
         * the function and to "ptw_info" from "smmu_translate()"
         * For stage-1:
         *   - EABT => CLASS_TT (hardcoded)
         *   - other events => CLASS_IN (input to function)
         * For stage-2 => CLASS_IN (input to function)
         * For nested, for all events:
         *  - CD fetch => CLASS_CD (input to function)
         *  - walking stage 1 translation table  => CLASS_TT (from
         *    is_ipa_descriptor or input in case of TTBx)
         *  - s2 translation => CLASS_IN (input to function)
         */
        class = ptw_info.is_ipa_descriptor ? SMMU_CLASS_TT : class;
        switch (ptw_info.type) {
        case SMMU_PTW_ERR_WALK_EABT:
            event->type = SMMU_EVT_F_WALK_EABT;
            event->u.f_walk_eabt.rnw = flag & 0x1;
            event->u.f_walk_eabt.class = (ptw_info.stage == SMMU_STAGE_2) ?
                                          class : SMMU_CLASS_TT;
            event->u.f_walk_eabt.addr2 = ptw_info.addr;
            break;
        case SMMU_PTW_ERR_TRANSLATION:
            if (PTW_RECORD_FAULT(ptw_info, cfg)) {
                event->type = SMMU_EVT_F_TRANSLATION;
                event->u.f_translation.addr2 = ptw_info.addr;
                event->u.f_translation.class = class;
                event->u.f_translation.rnw = flag & 0x1;
            }
            break;
        case SMMU_PTW_ERR_ADDR_SIZE:
            if (PTW_RECORD_FAULT(ptw_info, cfg)) {
                event->type = SMMU_EVT_F_ADDR_SIZE;
                event->u.f_addr_size.addr2 = ptw_info.addr;
                event->u.f_addr_size.class = class;
                event->u.f_addr_size.rnw = flag & 0x1;
            }
            break;
        case SMMU_PTW_ERR_ACCESS:
            if (PTW_RECORD_FAULT(ptw_info, cfg)) {
                event->type = SMMU_EVT_F_ACCESS;
                event->u.f_access.addr2 = ptw_info.addr;
                event->u.f_access.class = class;
                event->u.f_access.rnw = flag & 0x1;
            }
            break;
        case SMMU_PTW_ERR_PERMISSION:
            if (PTW_RECORD_FAULT(ptw_info, cfg)) {
                event->type = SMMU_EVT_F_PERMISSION;
                event->u.f_permission.addr2 = ptw_info.addr;
                event->u.f_permission.class = class;
                event->u.f_permission.rnw = flag & 0x1;
            }
            break;
        default:
            g_assert_not_reached();
        }
        return SMMU_TRANS_ERROR;
    }
    *out_entry = cached_entry;
    return SMMU_TRANS_SUCCESS;
}

/*
 * Sets the InputAddr for an SMMU_TRANS_ERROR, as it can't be
 * set from all contexts, as smmuv3_get_config() can return
 * translation faults in case of nested translation (for CD
 * and TTBx). But in that case the iova is not known.
 */
static void smmuv3_fixup_event(SMMUEventInfo *event, hwaddr iova)
{
    switch (event->type) {
    case SMMU_EVT_F_WALK_EABT:
    case SMMU_EVT_F_TRANSLATION:
    case SMMU_EVT_F_ADDR_SIZE:
    case SMMU_EVT_F_ACCESS:
    case SMMU_EVT_F_PERMISSION:
        event->u.f_walk_eabt.addr = iova;
        break;
    default:
        break;
    }
}

/* Entry point to SMMU, does everything. */
static IOMMUTLBEntry smmuv3_translate(IOMMUMemoryRegion *mr, hwaddr addr,
                                      IOMMUAccessFlags flag, int iommu_idx)
{
    SMMUDevice *sdev = container_of(mr, SMMUDevice, iommu);
    SMMUv3State *s = sdev->smmu;
    uint32_t sid = smmu_get_sid(sdev);
    SMMUEventInfo event = {.type = SMMU_EVT_NONE,
                           .sid = sid,
                           .inval_ste_allowed = false};
    SMMUTranslationStatus status;
    SMMUTransCfg *cfg = NULL;
    IOMMUTLBEntry entry = {
        .target_as = &address_space_memory,
        .iova = addr,
        .translated_addr = addr,
        .addr_mask = ~(hwaddr)0,
        .perm = IOMMU_NONE,
    };
    SMMUTLBEntry *cached_entry = NULL;

    qemu_mutex_lock(&s->mutex);

    if (!smmu_enabled(s)) {
        if (FIELD_EX32(s->gbpa, GBPA, ABORT)) {
            status = SMMU_TRANS_ABORT;
        } else {
            status = SMMU_TRANS_DISABLE;
        }
        goto epilogue;
    }

    cfg = smmuv3_get_config(sdev, &event);
    if (!cfg) {
        status = SMMU_TRANS_ERROR;
        goto epilogue;
    }

    if (cfg->aborted) {
        status = SMMU_TRANS_ABORT;
        goto epilogue;
    }

    if (cfg->bypassed) {
        status = SMMU_TRANS_BYPASS;
        goto epilogue;
    }

    status = smmuv3_do_translate(s, addr, cfg, &event, flag,
                                 &cached_entry, SMMU_CLASS_IN);

epilogue:
    qemu_mutex_unlock(&s->mutex);
    switch (status) {
    case SMMU_TRANS_SUCCESS:
        entry.perm = cached_entry->entry.perm;
        entry.translated_addr = CACHED_ENTRY_TO_ADDR(cached_entry, addr);
        entry.addr_mask = cached_entry->entry.addr_mask;
        trace_smmuv3_translate_success(mr->parent_obj.name, sid, addr,
                                       entry.translated_addr, entry.perm,
                                       cfg->stage);
        break;
    case SMMU_TRANS_DISABLE:
        entry.perm = flag;
        entry.addr_mask = ~TARGET_PAGE_MASK;
        trace_smmuv3_translate_disable(mr->parent_obj.name, sid, addr,
                                      entry.perm);
        break;
    case SMMU_TRANS_BYPASS:
        entry.perm = flag;
        entry.addr_mask = ~TARGET_PAGE_MASK;
        trace_smmuv3_translate_bypass(mr->parent_obj.name, sid, addr,
                                      entry.perm);
        break;
    case SMMU_TRANS_ABORT:
        /* no event is recorded on abort */
        trace_smmuv3_translate_abort(mr->parent_obj.name, sid, addr,
                                     entry.perm);
        break;
    case SMMU_TRANS_ERROR:
        smmuv3_fixup_event(&event, addr);
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s translation failed for iova=0x%"PRIx64" (%s)\n",
                      mr->parent_obj.name, addr, smmu_event_string(event.type));
        smmuv3_record_event(s, &event);
        break;
    }

    return entry;
}

/**
 * smmuv3_notify_iova - call the notifier @n for a given
 * @asid and @iova tuple.
 *
 * @mr: IOMMU mr region handle
 * @n: notifier to be called
 * @asid: address space ID or negative value if we don't care
 * @vmid: virtual machine ID or negative value if we don't care
 * @iova: iova
 * @tg: translation granule (if communicated through range invalidation)
 * @num_pages: number of @granule sized pages (if tg != 0), otherwise 1
 * @stage: Which stage(1 or 2) is used
 */
static void smmuv3_notify_iova(IOMMUMemoryRegion *mr,
                               IOMMUNotifier *n,
                               int asid, int vmid,
                               dma_addr_t iova, uint8_t tg,
                               uint64_t num_pages, int stage)
{
    SMMUDevice *sdev = container_of(mr, SMMUDevice, iommu);
    SMMUEventInfo eventinfo = {.inval_ste_allowed = true};
    SMMUTransCfg *cfg = smmuv3_get_config(sdev, &eventinfo);
    IOMMUTLBEvent event;
    uint8_t granule;

    if (!cfg) {
        return;
    }

    /*
     * stage is passed from TLB invalidation commands which can be either
     * stage-1 or stage-2.
     * However, IOMMUTLBEvent only understands IOVA, for stage-1 or stage-2
     * SMMU instances we consider the input address as the IOVA, but when
     * nesting is used, we can't mix stage-1 and stage-2 addresses, so for
     * nesting only stage-1 is considered the IOVA and would be notified.
     */
    if ((stage == SMMU_STAGE_2) && (cfg->stage == SMMU_NESTED))
        return;

    if (!tg) {
        SMMUTransTableInfo *tt;

        if (asid >= 0 && cfg->asid != asid) {
            return;
        }

        if (vmid >= 0 && cfg->s2cfg.vmid != vmid) {
            return;
        }

        if (stage == SMMU_STAGE_1) {
            tt = select_tt(cfg, iova);
            if (!tt) {
                return;
            }
            granule = tt->granule_sz;
        } else {
            granule = cfg->s2cfg.granule_sz;
        }

    } else {
        granule = tg * 2 + 10;
    }

    event.type = IOMMU_NOTIFIER_UNMAP;
    event.entry.target_as = &address_space_memory;
    event.entry.iova = iova;
    event.entry.addr_mask = num_pages * (1 << granule) - 1;
    event.entry.perm = IOMMU_NONE;

    memory_region_notify_iommu_one(n, &event);
}

/* invalidate an asid/vmid/iova range tuple in all mr's */
static void smmuv3_inv_notifiers_iova(SMMUState *s, int asid, int vmid,
                                      dma_addr_t iova, uint8_t tg,
                                      uint64_t num_pages, int stage)
{
    SMMUDevice *sdev;

    QLIST_FOREACH(sdev, &s->devices_with_notifiers, next) {
        IOMMUMemoryRegion *mr = &sdev->iommu;
        IOMMUNotifier *n;

        trace_smmuv3_inv_notifiers_iova(mr->parent_obj.name, asid, vmid,
                                        iova, tg, num_pages, stage);

        IOMMU_NOTIFIER_FOREACH(n, mr) {
            smmuv3_notify_iova(mr, n, asid, vmid, iova, tg, num_pages, stage);
        }
    }
}

static void smmuv3_range_inval(SMMUState *s, Cmd *cmd, SMMUStage stage)
{
    dma_addr_t end, addr = CMD_ADDR(cmd);
    uint8_t type = CMD_TYPE(cmd);
    int vmid = -1;
    uint8_t scale = CMD_SCALE(cmd);
    uint8_t num = CMD_NUM(cmd);
    uint8_t ttl = CMD_TTL(cmd);
    bool leaf = CMD_LEAF(cmd);
    uint8_t tg = CMD_TG(cmd);
    uint64_t num_pages;
    uint8_t granule;
    int asid = -1;
    SMMUv3State *smmuv3 = ARM_SMMUV3(s);

    /* Only consider VMID if stage-2 is supported. */
    if (STAGE2_SUPPORTED(smmuv3)) {
        vmid = CMD_VMID(cmd);
    }

    if (type == SMMU_CMD_TLBI_NH_VA) {
        asid = CMD_ASID(cmd);
    }

    if (!tg) {
        trace_smmuv3_range_inval(vmid, asid, addr, tg, 1, ttl, leaf, stage);
        smmuv3_inv_notifiers_iova(s, asid, vmid, addr, tg, 1, stage);
        if (stage == SMMU_STAGE_1) {
            smmu_iotlb_inv_iova(s, asid, vmid, addr, tg, 1, ttl);
        } else {
            smmu_iotlb_inv_ipa(s, vmid, addr, tg, 1, ttl);
        }
        return;
    }

    /* RIL in use */

    num_pages = (num + 1) * BIT_ULL(scale);
    granule = tg * 2 + 10;

    /* Split invalidations into ^2 range invalidations */
    end = addr + (num_pages << granule) - 1;

    while (addr != end + 1) {
        uint64_t mask = dma_aligned_pow2_mask(addr, end, 64);

        num_pages = (mask + 1) >> granule;
        trace_smmuv3_range_inval(vmid, asid, addr, tg, num_pages,
                                 ttl, leaf, stage);
        smmuv3_inv_notifiers_iova(s, asid, vmid, addr, tg, num_pages, stage);
        if (stage == SMMU_STAGE_1) {
            smmu_iotlb_inv_iova(s, asid, vmid, addr, tg, num_pages, ttl);
        } else {
            smmu_iotlb_inv_ipa(s, vmid, addr, tg, num_pages, ttl);
        }
        addr += mask + 1;
    }
}

static int smmuv3_cmdq_consume(SMMUv3State *s)
{
    SMMUState *bs = ARM_SMMU(s);
    SMMUCmdError cmd_error = SMMU_CERROR_NONE;
    SMMUQueue *q = &s->cmdq;
    SMMUCommandType type = 0;

    if (!smmuv3_cmdq_enabled(s)) {
        return 0;
    }
    /*
     * some commands depend on register values, typically CR0. In case those
     * register values change while handling the command, spec says it
     * is UNPREDICTABLE whether the command is interpreted under the new
     * or old value.
     */

    while (!smmuv3_q_empty(q)) {
        uint32_t pending = s->gerror ^ s->gerrorn;
        Cmd cmd;

        trace_smmuv3_cmdq_consume(Q_PROD(q), Q_CONS(q),
                                  Q_PROD_WRAP(q), Q_CONS_WRAP(q));

        if (FIELD_EX32(pending, GERROR, CMDQ_ERR)) {
            break;
        }

        if (queue_read(q, &cmd) != MEMTX_OK) {
            cmd_error = SMMU_CERROR_ABT;
            break;
        }

        type = CMD_TYPE(&cmd);

        trace_smmuv3_cmdq_opcode(smmu_cmd_string(type));

        qemu_mutex_lock(&s->mutex);
        switch (type) {
        case SMMU_CMD_SYNC:
            if (CMD_SYNC_CS(&cmd) & CMD_SYNC_SIG_IRQ) {
                smmuv3_trigger_irq(s, SMMU_IRQ_CMD_SYNC, 0);
            }
            break;
        case SMMU_CMD_PREFETCH_CONFIG:
        case SMMU_CMD_PREFETCH_ADDR:
            break;
        case SMMU_CMD_CFGI_STE:
        {
            uint32_t sid = CMD_SID(&cmd);
            SMMUDevice *sdev = smmu_find_sdev(bs, sid);

            if (CMD_SSEC(&cmd)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }

            if (!sdev) {
                break;
            }

            trace_smmuv3_cmdq_cfgi_ste(sid);
            smmuv3_flush_config(sdev);

            break;
        }
        case SMMU_CMD_CFGI_STE_RANGE: /* same as SMMU_CMD_CFGI_ALL */
        {
            uint32_t sid = CMD_SID(&cmd), mask;
            uint8_t range = CMD_STE_RANGE(&cmd);
            SMMUSIDRange sid_range;

            if (CMD_SSEC(&cmd)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }

            mask = (1ULL << (range + 1)) - 1;
            sid_range.start = sid & ~mask;
            sid_range.end = sid_range.start + mask;

            trace_smmuv3_cmdq_cfgi_ste_range(sid_range.start, sid_range.end);
            smmu_configs_inv_sid_range(bs, sid_range);
            break;
        }
        case SMMU_CMD_CFGI_CD:
        case SMMU_CMD_CFGI_CD_ALL:
        {
            uint32_t sid = CMD_SID(&cmd);
            SMMUDevice *sdev = smmu_find_sdev(bs, sid);

            if (CMD_SSEC(&cmd)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }

            if (!sdev) {
                break;
            }

            trace_smmuv3_cmdq_cfgi_cd(sid);
            smmuv3_flush_config(sdev);
            break;
        }
        case SMMU_CMD_TLBI_NH_ASID:
        {
            int asid = CMD_ASID(&cmd);
            int vmid = -1;

            if (!STAGE1_SUPPORTED(s)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }

            /*
             * VMID is only matched when stage 2 is supported, otherwise set it
             * to -1 as the value used for stage-1 only VMIDs.
             */
            if (STAGE2_SUPPORTED(s)) {
                vmid = CMD_VMID(&cmd);
            }

            trace_smmuv3_cmdq_tlbi_nh_asid(asid);
            smmu_inv_notifiers_all(&s->smmu_state);
            smmu_iotlb_inv_asid_vmid(bs, asid, vmid);
            break;
        }
        case SMMU_CMD_TLBI_NH_ALL:
        {
            int vmid = -1;

            if (!STAGE1_SUPPORTED(s)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }

            /*
             * If stage-2 is supported, invalidate for this VMID only, otherwise
             * invalidate the whole thing.
             */
            if (STAGE2_SUPPORTED(s)) {
                vmid = CMD_VMID(&cmd);
                trace_smmuv3_cmdq_tlbi_nh(vmid);
                smmu_iotlb_inv_vmid_s1(bs, vmid);
                break;
            }
            QEMU_FALLTHROUGH;
        }
        case SMMU_CMD_TLBI_NSNH_ALL:
            trace_smmuv3_cmdq_tlbi_nsnh();
            smmu_inv_notifiers_all(&s->smmu_state);
            smmu_iotlb_inv_all(bs);
            break;
        case SMMU_CMD_TLBI_NH_VAA:
        case SMMU_CMD_TLBI_NH_VA:
            if (!STAGE1_SUPPORTED(s)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }
            smmuv3_range_inval(bs, &cmd, SMMU_STAGE_1);
            break;
        case SMMU_CMD_TLBI_S12_VMALL:
        {
            int vmid = CMD_VMID(&cmd);

            if (!STAGE2_SUPPORTED(s)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }

            trace_smmuv3_cmdq_tlbi_s12_vmid(vmid);
            smmu_inv_notifiers_all(&s->smmu_state);
            smmu_iotlb_inv_vmid(bs, vmid);
            break;
        }
        case SMMU_CMD_TLBI_S2_IPA:
            if (!STAGE2_SUPPORTED(s)) {
                cmd_error = SMMU_CERROR_ILL;
                break;
            }
            /*
             * As currently only either s1 or s2 are supported
             * we can reuse same function for s2.
             */
            smmuv3_range_inval(bs, &cmd, SMMU_STAGE_2);
            break;
        case SMMU_CMD_TLBI_EL3_ALL:
        case SMMU_CMD_TLBI_EL3_VA:
        case SMMU_CMD_TLBI_EL2_ALL:
        case SMMU_CMD_TLBI_EL2_ASID:
        case SMMU_CMD_TLBI_EL2_VA:
        case SMMU_CMD_TLBI_EL2_VAA:
        case SMMU_CMD_ATC_INV:
        case SMMU_CMD_PRI_RESP:
        case SMMU_CMD_RESUME:
        case SMMU_CMD_STALL_TERM:
            trace_smmuv3_unhandled_cmd(type);
            break;
        default:
            cmd_error = SMMU_CERROR_ILL;
            break;
        }
        qemu_mutex_unlock(&s->mutex);
        if (cmd_error) {
            if (cmd_error == SMMU_CERROR_ILL) {
                qemu_log_mask(LOG_GUEST_ERROR,
                              "Illegal command type: %d\n", CMD_TYPE(&cmd));
            }
            break;
        }
        /*
         * We only increment the cons index after the completion of
         * the command. We do that because the SYNC returns immediately
         * and does not check the completion of previous commands
         */
        queue_cons_incr(q);
    }

    if (cmd_error) {
        trace_smmuv3_cmdq_consume_error(smmu_cmd_string(type), cmd_error);
        smmu_write_cmdq_err(s, cmd_error);
        smmuv3_trigger_irq(s, SMMU_IRQ_GERROR, R_GERROR_CMDQ_ERR_MASK);
    }

    trace_smmuv3_cmdq_consume_out(Q_PROD(q), Q_CONS(q),
                                  Q_PROD_WRAP(q), Q_CONS_WRAP(q));

    return 0;
}

static MemTxResult smmu_writell(SMMUv3State *s, hwaddr offset,
                               uint64_t data, MemTxAttrs attrs)
{
    switch (offset) {
    case A_GERROR_IRQ_CFG0:
        s->gerror_irq_cfg0 = data;
        return MEMTX_OK;
    case A_STRTAB_BASE:
        s->strtab_base = data;
        return MEMTX_OK;
    case A_CMDQ_BASE:
        s->cmdq.base = data;
        s->cmdq.log2size = extract64(s->cmdq.base, 0, 5);
        if (s->cmdq.log2size > SMMU_CMDQS) {
            s->cmdq.log2size = SMMU_CMDQS;
        }
        return MEMTX_OK;
    case A_EVENTQ_BASE:
        s->eventq.base = data;
        s->eventq.log2size = extract64(s->eventq.base, 0, 5);
        if (s->eventq.log2size > SMMU_EVENTQS) {
            s->eventq.log2size = SMMU_EVENTQS;
        }
        return MEMTX_OK;
    case A_EVENTQ_IRQ_CFG0:
        s->eventq_irq_cfg0 = data;
        return MEMTX_OK;
    default:
        qemu_log_mask(LOG_UNIMP,
                      "%s Unexpected 64-bit access to 0x%"PRIx64" (WI)\n",
                      __func__, offset);
        return MEMTX_OK;
    }
}

static MemTxResult smmu_writel(SMMUv3State *s, hwaddr offset,
                               uint64_t data, MemTxAttrs attrs)
{
    switch (offset) {
    case A_CR0:
        s->cr[0] = data;
        s->cr0ack = data & ~SMMU_CR0_RESERVED;
        /* in case the command queue has been enabled */
        smmuv3_cmdq_consume(s);
        return MEMTX_OK;
    case A_CR1:
        s->cr[1] = data;
        return MEMTX_OK;
    case A_CR2:
        s->cr[2] = data;
        return MEMTX_OK;
    case A_IRQ_CTRL:
        s->irq_ctrl = data;
        return MEMTX_OK;
    case A_GERRORN:
        smmuv3_write_gerrorn(s, data);
        /*
         * By acknowledging the CMDQ_ERR, SW may notify cmds can
         * be processed again
         */
        smmuv3_cmdq_consume(s);
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG0: /* 64b */
        s->gerror_irq_cfg0 = deposit64(s->gerror_irq_cfg0, 0, 32, data);
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG0 + 4:
        s->gerror_irq_cfg0 = deposit64(s->gerror_irq_cfg0, 32, 32, data);
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG1:
        s->gerror_irq_cfg1 = data;
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG2:
        s->gerror_irq_cfg2 = data;
        return MEMTX_OK;
    case A_GBPA:
        /*
         * If UPDATE is not set, the write is ignored. This is the only
         * permitted behavior in SMMUv3.2 and later.
         */
        if (data & R_GBPA_UPDATE_MASK) {
            /* Ignore update bit as write is synchronous. */
            s->gbpa = data & ~R_GBPA_UPDATE_MASK;
        }
        return MEMTX_OK;
    case A_STRTAB_BASE: /* 64b */
        s->strtab_base = deposit64(s->strtab_base, 0, 32, data);
        return MEMTX_OK;
    case A_STRTAB_BASE + 4:
        s->strtab_base = deposit64(s->strtab_base, 32, 32, data);
        return MEMTX_OK;
    case A_STRTAB_BASE_CFG:
        s->strtab_base_cfg = data;
        if (FIELD_EX32(data, STRTAB_BASE_CFG, FMT) == 1) {
            s->sid_split = FIELD_EX32(data, STRTAB_BASE_CFG, SPLIT);
            s->features |= SMMU_FEATURE_2LVL_STE;
        }
        return MEMTX_OK;
    case A_CMDQ_BASE: /* 64b */
        s->cmdq.base = deposit64(s->cmdq.base, 0, 32, data);
        s->cmdq.log2size = extract64(s->cmdq.base, 0, 5);
        if (s->cmdq.log2size > SMMU_CMDQS) {
            s->cmdq.log2size = SMMU_CMDQS;
        }
        return MEMTX_OK;
    case A_CMDQ_BASE + 4: /* 64b */
        s->cmdq.base = deposit64(s->cmdq.base, 32, 32, data);
        return MEMTX_OK;
    case A_CMDQ_PROD:
        s->cmdq.prod = data;
        smmuv3_cmdq_consume(s);
        return MEMTX_OK;
    case A_CMDQ_CONS:
        s->cmdq.cons = data;
        return MEMTX_OK;
    case A_EVENTQ_BASE: /* 64b */
        s->eventq.base = deposit64(s->eventq.base, 0, 32, data);
        s->eventq.log2size = extract64(s->eventq.base, 0, 5);
        if (s->eventq.log2size > SMMU_EVENTQS) {
            s->eventq.log2size = SMMU_EVENTQS;
        }
        return MEMTX_OK;
    case A_EVENTQ_BASE + 4:
        s->eventq.base = deposit64(s->eventq.base, 32, 32, data);
        return MEMTX_OK;
    case A_EVENTQ_PROD:
        s->eventq.prod = data;
        return MEMTX_OK;
    case A_EVENTQ_CONS:
        s->eventq.cons = data;
        return MEMTX_OK;
    case A_EVENTQ_IRQ_CFG0: /* 64b */
        s->eventq_irq_cfg0 = deposit64(s->eventq_irq_cfg0, 0, 32, data);
        return MEMTX_OK;
    case A_EVENTQ_IRQ_CFG0 + 4:
        s->eventq_irq_cfg0 = deposit64(s->eventq_irq_cfg0, 32, 32, data);
        return MEMTX_OK;
    case A_EVENTQ_IRQ_CFG1:
        s->eventq_irq_cfg1 = data;
        return MEMTX_OK;
    case A_EVENTQ_IRQ_CFG2:
        s->eventq_irq_cfg2 = data;
        return MEMTX_OK;
    default:
        qemu_log_mask(LOG_UNIMP,
                      "%s Unexpected 32-bit access to 0x%"PRIx64" (WI)\n",
                      __func__, offset);
        return MEMTX_OK;
    }
}

static MemTxResult smmu_write_mmio(void *opaque, hwaddr offset, uint64_t data,
                                   unsigned size, MemTxAttrs attrs)
{
    SMMUState *sys = opaque;
    SMMUv3State *s = ARM_SMMUV3(sys);
    MemTxResult r;

    /* CONSTRAINED UNPREDICTABLE choice to have page0/1 be exact aliases */
    offset &= ~0x10000;

    switch (size) {
    case 8:
        r = smmu_writell(s, offset, data, attrs);
        break;
    case 4:
        r = smmu_writel(s, offset, data, attrs);
        break;
    default:
        r = MEMTX_ERROR;
        break;
    }

    trace_smmuv3_write_mmio(offset, data, size, r);
    return r;
}

static MemTxResult smmu_readll(SMMUv3State *s, hwaddr offset,
                               uint64_t *data, MemTxAttrs attrs)
{
    switch (offset) {
    case A_GERROR_IRQ_CFG0:
        *data = s->gerror_irq_cfg0;
        return MEMTX_OK;
    case A_STRTAB_BASE:
        *data = s->strtab_base;
        return MEMTX_OK;
    case A_CMDQ_BASE:
        *data = s->cmdq.base;
        return MEMTX_OK;
    case A_EVENTQ_BASE:
        *data = s->eventq.base;
        return MEMTX_OK;
    default:
        *data = 0;
        qemu_log_mask(LOG_UNIMP,
                      "%s Unexpected 64-bit access to 0x%"PRIx64" (RAZ)\n",
                      __func__, offset);
        return MEMTX_OK;
    }
}

static MemTxResult smmu_readl(SMMUv3State *s, hwaddr offset,
                              uint64_t *data, MemTxAttrs attrs)
{
    switch (offset) {
    case A_IDREGS ... A_IDREGS + 0x2f:
        *data = smmuv3_idreg(offset - A_IDREGS);
        return MEMTX_OK;
    case A_IDR0 ... A_IDR5:
        *data = s->idr[(offset - A_IDR0) / 4];
        return MEMTX_OK;
    case A_IIDR:
        *data = s->iidr;
        return MEMTX_OK;
    case A_AIDR:
        *data = s->aidr;
        return MEMTX_OK;
    case A_CR0:
        *data = s->cr[0];
        return MEMTX_OK;
    case A_CR0ACK:
        *data = s->cr0ack;
        return MEMTX_OK;
    case A_CR1:
        *data = s->cr[1];
        return MEMTX_OK;
    case A_CR2:
        *data = s->cr[2];
        return MEMTX_OK;
    case A_STATUSR:
        *data = s->statusr;
        return MEMTX_OK;
    case A_GBPA:
        *data = s->gbpa;
        return MEMTX_OK;
    case A_IRQ_CTRL:
    case A_IRQ_CTRL_ACK:
        *data = s->irq_ctrl;
        return MEMTX_OK;
    case A_GERROR:
        *data = s->gerror;
        return MEMTX_OK;
    case A_GERRORN:
        *data = s->gerrorn;
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG0: /* 64b */
        *data = extract64(s->gerror_irq_cfg0, 0, 32);
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG0 + 4:
        *data = extract64(s->gerror_irq_cfg0, 32, 32);
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG1:
        *data = s->gerror_irq_cfg1;
        return MEMTX_OK;
    case A_GERROR_IRQ_CFG2:
        *data = s->gerror_irq_cfg2;
        return MEMTX_OK;
    case A_STRTAB_BASE: /* 64b */
        *data = extract64(s->strtab_base, 0, 32);
        return MEMTX_OK;
    case A_STRTAB_BASE + 4: /* 64b */
        *data = extract64(s->strtab_base, 32, 32);
        return MEMTX_OK;
    case A_STRTAB_BASE_CFG:
        *data = s->strtab_base_cfg;
        return MEMTX_OK;
    case A_CMDQ_BASE: /* 64b */
        *data = extract64(s->cmdq.base, 0, 32);
        return MEMTX_OK;
    case A_CMDQ_BASE + 4:
        *data = extract64(s->cmdq.base, 32, 32);
        return MEMTX_OK;
    case A_CMDQ_PROD:
        *data = s->cmdq.prod;
        return MEMTX_OK;
    case A_CMDQ_CONS:
        *data = s->cmdq.cons;
        return MEMTX_OK;
    case A_EVENTQ_BASE: /* 64b */
        *data = extract64(s->eventq.base, 0, 32);
        return MEMTX_OK;
    case A_EVENTQ_BASE + 4: /* 64b */
        *data = extract64(s->eventq.base, 32, 32);
        return MEMTX_OK;
    case A_EVENTQ_PROD:
        *data = s->eventq.prod;
        return MEMTX_OK;
    case A_EVENTQ_CONS:
        *data = s->eventq.cons;
        return MEMTX_OK;
    default:
        *data = 0;
        qemu_log_mask(LOG_UNIMP,
                      "%s unhandled 32-bit access at 0x%"PRIx64" (RAZ)\n",
                      __func__, offset);
        return MEMTX_OK;
    }
}

static MemTxResult smmu_read_mmio(void *opaque, hwaddr offset, uint64_t *data,
                                  unsigned size, MemTxAttrs attrs)
{
    SMMUState *sys = opaque;
    SMMUv3State *s = ARM_SMMUV3(sys);
    MemTxResult r;

    /* CONSTRAINED UNPREDICTABLE choice to have page0/1 be exact aliases */
    offset &= ~0x10000;

    switch (size) {
    case 8:
        r = smmu_readll(s, offset, data, attrs);
        break;
    case 4:
        r = smmu_readl(s, offset, data, attrs);
        break;
    default:
        r = MEMTX_ERROR;
        break;
    }

    trace_smmuv3_read_mmio(offset, *data, size, r);
    return r;
}

static const MemoryRegionOps smmu_mem_ops = {
    .read_with_attrs = smmu_read_mmio,
    .write_with_attrs = smmu_write_mmio,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .valid = {
        .min_access_size = 4,
        .max_access_size = 8,
    },
    .impl = {
        .min_access_size = 4,
        .max_access_size = 8,
    },
};

static void smmu_init_irq(SMMUv3State *s, SysBusDevice *dev)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
        sysbus_init_irq(dev, &s->irq[i]);
    }
}

/*
 * Make sure the IOMMU is reset in 'exit' phase after
 * all outstanding DMA requests have been quiesced during
 * the 'enter' or 'hold' reset phases
 */
static void smmu_reset_exit(Object *obj, ResetType type)
{
    SMMUv3State *s = ARM_SMMUV3(obj);
    SMMUv3Class *c = ARM_SMMUV3_GET_CLASS(s);

    trace_smmu_reset_exit();
    if (c->parent_phases.exit) {
        c->parent_phases.exit(obj, type);
    }

    smmuv3_init_regs(s);
}

static void smmu_realize(DeviceState *d, Error **errp)
{
    SMMUState *sys = ARM_SMMU(d);
    SMMUv3State *s = ARM_SMMUV3(sys);
    SMMUv3Class *c = ARM_SMMUV3_GET_CLASS(s);
    SysBusDevice *dev = SYS_BUS_DEVICE(d);
    Error *local_err = NULL;

    c->parent_realize(d, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

    qemu_mutex_init(&s->mutex);

    memory_region_init_io(&sys->iomem, OBJECT(s),
                          &smmu_mem_ops, sys, TYPE_ARM_SMMUV3, 0x20000);

    sys->mrtypename = TYPE_SMMUV3_IOMMU_MEMORY_REGION;

    sysbus_init_mmio(dev, &sys->iomem);

    smmu_init_irq(s, dev);
}

static const VMStateDescription vmstate_smmuv3_queue = {
    .name = "smmuv3_queue",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT64(base, SMMUQueue),
        VMSTATE_UINT32(prod, SMMUQueue),
        VMSTATE_UINT32(cons, SMMUQueue),
        VMSTATE_UINT8(log2size, SMMUQueue),
        VMSTATE_END_OF_LIST(),
    },
};

static bool smmuv3_gbpa_needed(void *opaque)
{
    SMMUv3State *s = opaque;

    /* Only migrate GBPA if it has different reset value. */
    return s->gbpa != SMMU_GBPA_RESET_VAL;
}

static const VMStateDescription vmstate_gbpa = {
    .name = "smmuv3/gbpa",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = smmuv3_gbpa_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT32(gbpa, SMMUv3State),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_smmuv3 = {
    .name = "smmuv3",
    .version_id = 1,
    .minimum_version_id = 1,
    .priority = MIG_PRI_IOMMU,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT32(features, SMMUv3State),
        VMSTATE_UINT8(sid_size, SMMUv3State),
        VMSTATE_UINT8(sid_split, SMMUv3State),

        VMSTATE_UINT32_ARRAY(cr, SMMUv3State, 3),
        VMSTATE_UINT32(cr0ack, SMMUv3State),
        VMSTATE_UINT32(statusr, SMMUv3State),
        VMSTATE_UINT32(irq_ctrl, SMMUv3State),
        VMSTATE_UINT32(gerror, SMMUv3State),
        VMSTATE_UINT32(gerrorn, SMMUv3State),
        VMSTATE_UINT64(gerror_irq_cfg0, SMMUv3State),
        VMSTATE_UINT32(gerror_irq_cfg1, SMMUv3State),
        VMSTATE_UINT32(gerror_irq_cfg2, SMMUv3State),
        VMSTATE_UINT64(strtab_base, SMMUv3State),
        VMSTATE_UINT32(strtab_base_cfg, SMMUv3State),
        VMSTATE_UINT64(eventq_irq_cfg0, SMMUv3State),
        VMSTATE_UINT32(eventq_irq_cfg1, SMMUv3State),
        VMSTATE_UINT32(eventq_irq_cfg2, SMMUv3State),

        VMSTATE_STRUCT(cmdq, SMMUv3State, 0, vmstate_smmuv3_queue, SMMUQueue),
        VMSTATE_STRUCT(eventq, SMMUv3State, 0, vmstate_smmuv3_queue, SMMUQueue),

        VMSTATE_END_OF_LIST(),
    },
    .subsections = (const VMStateDescription * const []) {
        &vmstate_gbpa,
        NULL
    }
};

static const Property smmuv3_properties[] = {
    /*
     * Stages of translation advertised.
     * "1": Stage 1
     * "2": Stage 2
     * "nested": Both stage 1 and stage 2
     * Defaults to stage 1
     */
    DEFINE_PROP_STRING("stage", SMMUv3State, stage),
};

static void smmuv3_instance_init(Object *obj)
{
    /* Nothing much to do here as of now */
}

static void smmuv3_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    ResettableClass *rc = RESETTABLE_CLASS(klass);
    SMMUv3Class *c = ARM_SMMUV3_CLASS(klass);

    dc->vmsd = &vmstate_smmuv3;
    resettable_class_set_parent_phases(rc, NULL, NULL, smmu_reset_exit,
                                       &c->parent_phases);
    device_class_set_parent_realize(dc, smmu_realize,
                                    &c->parent_realize);
    device_class_set_props(dc, smmuv3_properties);
}

static int smmuv3_notify_flag_changed(IOMMUMemoryRegion *iommu,
                                      IOMMUNotifierFlag old,
                                      IOMMUNotifierFlag new,
                                      Error **errp)
{
    SMMUDevice *sdev = container_of(iommu, SMMUDevice, iommu);
    SMMUv3State *s3 = sdev->smmu;
    SMMUState *s = &(s3->smmu_state);

    if (new & IOMMU_NOTIFIER_DEVIOTLB_UNMAP) {
        error_setg(errp, "SMMUv3 does not support dev-iotlb yet");
        return -EINVAL;
    }

    if (new & IOMMU_NOTIFIER_MAP) {
        error_setg(errp,
                   "device %02x.%02x.%x requires iommu MAP notifier which is "
                   "not currently supported", pci_bus_num(sdev->bus),
                   PCI_SLOT(sdev->devfn), PCI_FUNC(sdev->devfn));
        return -EINVAL;
    }

    if (old == IOMMU_NOTIFIER_NONE) {
        trace_smmuv3_notify_flag_add(iommu->parent_obj.name);
        QLIST_INSERT_HEAD(&s->devices_with_notifiers, sdev, next);
    } else if (new == IOMMU_NOTIFIER_NONE) {
        trace_smmuv3_notify_flag_del(iommu->parent_obj.name);
        QLIST_REMOVE(sdev, next);
    }
    return 0;
}

static void smmuv3_iommu_memory_region_class_init(ObjectClass *klass,
                                                  void *data)
{
    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass);

    imrc->translate = smmuv3_translate;
    imrc->notify_flag_changed = smmuv3_notify_flag_changed;
}

static const TypeInfo smmuv3_type_info = {
    .name          = TYPE_ARM_SMMUV3,
    .parent        = TYPE_ARM_SMMU,
    .instance_size = sizeof(SMMUv3State),
    .instance_init = smmuv3_instance_init,
    .class_size    = sizeof(SMMUv3Class),
    .class_init    = smmuv3_class_init,
};

static const TypeInfo smmuv3_iommu_memory_region_info = {
    .parent = TYPE_IOMMU_MEMORY_REGION,
    .name = TYPE_SMMUV3_IOMMU_MEMORY_REGION,
    .class_init = smmuv3_iommu_memory_region_class_init,
};

static void smmuv3_register_types(void)
{
    type_register_static(&smmuv3_type_info);
    type_register_static(&smmuv3_iommu_memory_region_info);
}

type_init(smmuv3_register_types)