#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qapi/error.h"
#include "sysemu/hw_accel.h"
#include "sysemu/runstate.h"
#include "qemu/log.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/error-report.h"
#include "exec/exec-all.h"
#include "helper_regs.h"
#include "hw/ppc/ppc.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_cpu_core.h"
#include "mmu-hash64.h"
#include "cpu-models.h"
#include "trace.h"
#include "kvm_ppc.h"
#include "hw/ppc/fdt.h"
#include "hw/ppc/spapr_ovec.h"
#include "hw/ppc/spapr_numa.h"
#include "mmu-book3s-v3.h"
#include "hw/mem/memory-device.h"

bool is_ram_address(SpaprMachineState *spapr, hwaddr addr)
{
    MachineState *machine = MACHINE(spapr);
    DeviceMemoryState *dms = machine->device_memory;

    if (addr < machine->ram_size) {
        return true;
    }
    if ((addr >= dms->base)
        && ((addr - dms->base) < memory_region_size(&dms->mr))) {
        return true;
    }

    return false;
}

/* Convert a return code from the KVM ioctl()s implementing resize HPT
 * into a PAPR hypercall return code */
static target_ulong resize_hpt_convert_rc(int ret)
{
    if (ret >= 100000) {
        return H_LONG_BUSY_ORDER_100_SEC;
    } else if (ret >= 10000) {
        return H_LONG_BUSY_ORDER_10_SEC;
    } else if (ret >= 1000) {
        return H_LONG_BUSY_ORDER_1_SEC;
    } else if (ret >= 100) {
        return H_LONG_BUSY_ORDER_100_MSEC;
    } else if (ret >= 10) {
        return H_LONG_BUSY_ORDER_10_MSEC;
    } else if (ret > 0) {
        return H_LONG_BUSY_ORDER_1_MSEC;
    }

    switch (ret) {
    case 0:
        return H_SUCCESS;
    case -EPERM:
        return H_AUTHORITY;
    case -EINVAL:
        return H_PARAMETER;
    case -ENXIO:
        return H_CLOSED;
    case -ENOSPC:
        return H_PTEG_FULL;
    case -EBUSY:
        return H_BUSY;
    case -ENOMEM:
        return H_NO_MEM;
    default:
        return H_HARDWARE;
    }
}

static target_ulong h_resize_hpt_prepare(PowerPCCPU *cpu,
                                         SpaprMachineState *spapr,
                                         target_ulong opcode,
                                         target_ulong *args)
{
    target_ulong flags = args[0];
    int shift = args[1];
    uint64_t current_ram_size;
    int rc;

    if (spapr->resize_hpt == SPAPR_RESIZE_HPT_DISABLED) {
        return H_AUTHORITY;
    }

    if (!spapr->htab_shift) {
        /* Radix guest, no HPT */
        return H_NOT_AVAILABLE;
    }

    trace_spapr_h_resize_hpt_prepare(flags, shift);

    if (flags != 0) {
        return H_PARAMETER;
    }

    if (shift && ((shift < 18) || (shift > 46))) {
        return H_PARAMETER;
    }

    current_ram_size = MACHINE(spapr)->ram_size + get_plugged_memory_size();

    /* We only allow the guest to allocate an HPT one order above what
     * we'd normally give them (to stop a small guest claiming a huge
     * chunk of resources in the HPT */
    if (shift > (spapr_hpt_shift_for_ramsize(current_ram_size) + 1)) {
        return H_RESOURCE;
    }

    rc = kvmppc_resize_hpt_prepare(cpu, flags, shift);
    if (rc != -ENOSYS) {
        return resize_hpt_convert_rc(rc);
    }

    if (kvm_enabled()) {
        return H_HARDWARE;
    }

    return softmmu_resize_hpt_prepare(cpu, spapr, shift);
}

static void do_push_sregs_to_kvm_pr(CPUState *cs, run_on_cpu_data data)
{
    int ret;

    cpu_synchronize_state(cs);

    ret = kvmppc_put_books_sregs(POWERPC_CPU(cs));
    if (ret < 0) {
        error_report("failed to push sregs to KVM: %s", strerror(-ret));
        exit(1);
    }
}

void push_sregs_to_kvm_pr(SpaprMachineState *spapr)
{
    CPUState *cs;

    /*
     * This is a hack for the benefit of KVM PR - it abuses the SDR1
     * slot in kvm_sregs to communicate the userspace address of the
     * HPT
     */
    if (!kvm_enabled() || !spapr->htab) {
        return;
    }

    CPU_FOREACH(cs) {
        run_on_cpu(cs, do_push_sregs_to_kvm_pr, RUN_ON_CPU_NULL);
    }
}

static target_ulong h_resize_hpt_commit(PowerPCCPU *cpu,
                                        SpaprMachineState *spapr,
                                        target_ulong opcode,
                                        target_ulong *args)
{
    target_ulong flags = args[0];
    target_ulong shift = args[1];
    int rc;

    if (spapr->resize_hpt == SPAPR_RESIZE_HPT_DISABLED) {
        return H_AUTHORITY;
    }

    if (!spapr->htab_shift) {
        /* Radix guest, no HPT */
        return H_NOT_AVAILABLE;
    }

    trace_spapr_h_resize_hpt_commit(flags, shift);

    rc = kvmppc_resize_hpt_commit(cpu, flags, shift);
    if (rc != -ENOSYS) {
        rc = resize_hpt_convert_rc(rc);
        if (rc == H_SUCCESS) {
            /* Need to set the new htab_shift in the machine state */
            spapr->htab_shift = shift;
        }
        return rc;
    }

    if (kvm_enabled()) {
        return H_HARDWARE;
    }

    return softmmu_resize_hpt_commit(cpu, spapr, flags, shift);
}


static target_ulong h_set_sprg0(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                target_ulong opcode, target_ulong *args)
{
    cpu_synchronize_state(CPU(cpu));
    cpu->env.spr[SPR_SPRG0] = args[0];

    return H_SUCCESS;
}

static target_ulong h_set_dabr(PowerPCCPU *cpu, SpaprMachineState *spapr,
                               target_ulong opcode, target_ulong *args)
{
    if (!ppc_has_spr(cpu, SPR_DABR)) {
        return H_HARDWARE;              /* DABR register not available */
    }
    cpu_synchronize_state(CPU(cpu));

    if (ppc_has_spr(cpu, SPR_DABRX)) {
        cpu->env.spr[SPR_DABRX] = 0x3;  /* Use Problem and Privileged state */
    } else if (!(args[0] & 0x4)) {      /* Breakpoint Translation set? */
        return H_RESERVED_DABR;
    }

    cpu->env.spr[SPR_DABR] = args[0];
    return H_SUCCESS;
}

static target_ulong h_set_xdabr(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                target_ulong opcode, target_ulong *args)
{
    target_ulong dabrx = args[1];

    if (!ppc_has_spr(cpu, SPR_DABR) || !ppc_has_spr(cpu, SPR_DABRX)) {
        return H_HARDWARE;
    }

    if ((dabrx & ~0xfULL) != 0 || (dabrx & H_DABRX_HYPERVISOR) != 0
        || (dabrx & (H_DABRX_KERNEL | H_DABRX_USER)) == 0) {
        return H_PARAMETER;
    }

    cpu_synchronize_state(CPU(cpu));
    cpu->env.spr[SPR_DABRX] = dabrx;
    cpu->env.spr[SPR_DABR] = args[0];

    return H_SUCCESS;
}

static target_ulong h_page_init(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                target_ulong opcode, target_ulong *args)
{
    target_ulong flags = args[0];
    hwaddr dst = args[1];
    hwaddr src = args[2];
    hwaddr len = TARGET_PAGE_SIZE;
    uint8_t *pdst, *psrc;
    target_long ret = H_SUCCESS;

    if (flags & ~(H_ICACHE_SYNCHRONIZE | H_ICACHE_INVALIDATE
                  | H_COPY_PAGE | H_ZERO_PAGE)) {
        qemu_log_mask(LOG_UNIMP, "h_page_init: Bad flags (" TARGET_FMT_lx "\n",
                      flags);
        return H_PARAMETER;
    }

    /* Map-in destination */
    if (!is_ram_address(spapr, dst) || (dst & ~TARGET_PAGE_MASK) != 0) {
        return H_PARAMETER;
    }
    pdst = cpu_physical_memory_map(dst, &len, true);
    if (!pdst || len != TARGET_PAGE_SIZE) {
        return H_PARAMETER;
    }

    if (flags & H_COPY_PAGE) {
        /* Map-in source, copy to destination, and unmap source again */
        if (!is_ram_address(spapr, src) || (src & ~TARGET_PAGE_MASK) != 0) {
            ret = H_PARAMETER;
            goto unmap_out;
        }
        psrc = cpu_physical_memory_map(src, &len, false);
        if (!psrc || len != TARGET_PAGE_SIZE) {
            ret = H_PARAMETER;
            goto unmap_out;
        }
        memcpy(pdst, psrc, len);
        cpu_physical_memory_unmap(psrc, len, 0, len);
    } else if (flags & H_ZERO_PAGE) {
        memset(pdst, 0, len);          /* Just clear the destination page */
    }

    if (kvm_enabled() && (flags & H_ICACHE_SYNCHRONIZE) != 0) {
        kvmppc_dcbst_range(cpu, pdst, len);
    }
    if (flags & (H_ICACHE_SYNCHRONIZE | H_ICACHE_INVALIDATE)) {
        if (kvm_enabled()) {
            kvmppc_icbi_range(cpu, pdst, len);
        } else {
            tb_flush(CPU(cpu));
        }
    }

unmap_out:
    cpu_physical_memory_unmap(pdst, TARGET_PAGE_SIZE, 1, len);
    return ret;
}

#define FLAGS_REGISTER_VPA         0x0000200000000000ULL
#define FLAGS_REGISTER_DTL         0x0000400000000000ULL
#define FLAGS_REGISTER_SLBSHADOW   0x0000600000000000ULL
#define FLAGS_DEREGISTER_VPA       0x0000a00000000000ULL
#define FLAGS_DEREGISTER_DTL       0x0000c00000000000ULL
#define FLAGS_DEREGISTER_SLBSHADOW 0x0000e00000000000ULL

static target_ulong register_vpa(PowerPCCPU *cpu, target_ulong vpa)
{
    CPUState *cs = CPU(cpu);
    CPUPPCState *env = &cpu->env;
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
    uint16_t size;
    uint8_t tmp;

    if (vpa == 0) {
        hcall_dprintf("Can't cope with registering a VPA at logical 0\n");
        return H_HARDWARE;
    }

    if (vpa % env->dcache_line_size) {
        return H_PARAMETER;
    }
    /* FIXME: bounds check the address */

    size = lduw_be_phys(cs->as, vpa + 0x4);

    if (size < VPA_MIN_SIZE) {
        return H_PARAMETER;
    }

    /* VPA is not allowed to cross a page boundary */
    if ((vpa / 4096) != ((vpa + size - 1) / 4096)) {
        return H_PARAMETER;
    }

    spapr_cpu->vpa_addr = vpa;

    tmp = ldub_phys(cs->as, spapr_cpu->vpa_addr + VPA_SHARED_PROC_OFFSET);
    tmp |= VPA_SHARED_PROC_VAL;
    stb_phys(cs->as, spapr_cpu->vpa_addr + VPA_SHARED_PROC_OFFSET, tmp);

    return H_SUCCESS;
}

static target_ulong deregister_vpa(PowerPCCPU *cpu, target_ulong vpa)
{
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);

    if (spapr_cpu->slb_shadow_addr) {
        return H_RESOURCE;
    }

    if (spapr_cpu->dtl_addr) {
        return H_RESOURCE;
    }

    spapr_cpu->vpa_addr = 0;
    return H_SUCCESS;
}

static target_ulong register_slb_shadow(PowerPCCPU *cpu, target_ulong addr)
{
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
    uint32_t size;

    if (addr == 0) {
        hcall_dprintf("Can't cope with SLB shadow at logical 0\n");
        return H_HARDWARE;
    }

    size = ldl_be_phys(CPU(cpu)->as, addr + 0x4);
    if (size < 0x8) {
        return H_PARAMETER;
    }

    if ((addr / 4096) != ((addr + size - 1) / 4096)) {
        return H_PARAMETER;
    }

    if (!spapr_cpu->vpa_addr) {
        return H_RESOURCE;
    }

    spapr_cpu->slb_shadow_addr = addr;
    spapr_cpu->slb_shadow_size = size;

    return H_SUCCESS;
}

static target_ulong deregister_slb_shadow(PowerPCCPU *cpu, target_ulong addr)
{
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);

    spapr_cpu->slb_shadow_addr = 0;
    spapr_cpu->slb_shadow_size = 0;
    return H_SUCCESS;
}

static target_ulong register_dtl(PowerPCCPU *cpu, target_ulong addr)
{
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
    uint32_t size;

    if (addr == 0) {
        hcall_dprintf("Can't cope with DTL at logical 0\n");
        return H_HARDWARE;
    }

    size = ldl_be_phys(CPU(cpu)->as, addr + 0x4);

    if (size < 48) {
        return H_PARAMETER;
    }

    if (!spapr_cpu->vpa_addr) {
        return H_RESOURCE;
    }

    spapr_cpu->dtl_addr = addr;
    spapr_cpu->dtl_size = size;

    return H_SUCCESS;
}

static target_ulong deregister_dtl(PowerPCCPU *cpu, target_ulong addr)
{
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);

    spapr_cpu->dtl_addr = 0;
    spapr_cpu->dtl_size = 0;

    return H_SUCCESS;
}

static target_ulong h_register_vpa(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                   target_ulong opcode, target_ulong *args)
{
    target_ulong flags = args[0];
    target_ulong procno = args[1];
    target_ulong vpa = args[2];
    target_ulong ret = H_PARAMETER;
    PowerPCCPU *tcpu;

    tcpu = spapr_find_cpu(procno);
    if (!tcpu) {
        return H_PARAMETER;
    }

    switch (flags) {
    case FLAGS_REGISTER_VPA:
        ret = register_vpa(tcpu, vpa);
        break;

    case FLAGS_DEREGISTER_VPA:
        ret = deregister_vpa(tcpu, vpa);
        break;

    case FLAGS_REGISTER_SLBSHADOW:
        ret = register_slb_shadow(tcpu, vpa);
        break;

    case FLAGS_DEREGISTER_SLBSHADOW:
        ret = deregister_slb_shadow(tcpu, vpa);
        break;

    case FLAGS_REGISTER_DTL:
        ret = register_dtl(tcpu, vpa);
        break;

    case FLAGS_DEREGISTER_DTL:
        ret = deregister_dtl(tcpu, vpa);
        break;
    }

    return ret;
}

static target_ulong h_cede(PowerPCCPU *cpu, SpaprMachineState *spapr,
                           target_ulong opcode, target_ulong *args)
{
    CPUPPCState *env = &cpu->env;
    CPUState *cs = CPU(cpu);
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);

    env->msr |= (1ULL << MSR_EE);
    hreg_compute_hflags(env);

    if (spapr_cpu->prod) {
        spapr_cpu->prod = false;
        return H_SUCCESS;
    }

    if (!cpu_has_work(cs)) {
        cs->halted = 1;
        cs->exception_index = EXCP_HLT;
        cs->exit_request = 1;
    }

    return H_SUCCESS;
}

/*
 * Confer to self, aka join. Cede could use the same pattern as well, if
 * EXCP_HLT can be changed to ECXP_HALTED.
 */
static target_ulong h_confer_self(PowerPCCPU *cpu)
{
    CPUState *cs = CPU(cpu);
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);

    if (spapr_cpu->prod) {
        spapr_cpu->prod = false;
        return H_SUCCESS;
    }
    cs->halted = 1;
    cs->exception_index = EXCP_HALTED;
    cs->exit_request = 1;

    return H_SUCCESS;
}

static target_ulong h_join(PowerPCCPU *cpu, SpaprMachineState *spapr,
                           target_ulong opcode, target_ulong *args)
{
    CPUPPCState *env = &cpu->env;
    CPUState *cs;
    bool last_unjoined = true;

    if (env->msr & (1ULL << MSR_EE)) {
        return H_BAD_MODE;
    }

    /*
     * Must not join the last CPU running. Interestingly, no such restriction
     * for H_CONFER-to-self, but that is probably not intended to be used
     * when H_JOIN is available.
     */
    CPU_FOREACH(cs) {
        PowerPCCPU *c = POWERPC_CPU(cs);
        CPUPPCState *e = &c->env;
        if (c == cpu) {
            continue;
        }

        /* Don't have a way to indicate joined, so use halted && MSR[EE]=0 */
        if (!cs->halted || (e->msr & (1ULL << MSR_EE))) {
            last_unjoined = false;
            break;
        }
    }
    if (last_unjoined) {
        return H_CONTINUE;
    }

    return h_confer_self(cpu);
}

static target_ulong h_confer(PowerPCCPU *cpu, SpaprMachineState *spapr,
                           target_ulong opcode, target_ulong *args)
{
    target_long target = args[0];
    uint32_t dispatch = args[1];
    CPUState *cs = CPU(cpu);
    SpaprCpuState *spapr_cpu;

    /*
     * -1 means confer to all other CPUs without dispatch counter check,
     *  otherwise it's a targeted confer.
     */
    if (target != -1) {
        PowerPCCPU *target_cpu = spapr_find_cpu(target);
        uint32_t target_dispatch;

        if (!target_cpu) {
            return H_PARAMETER;
        }

        /*
         * target == self is a special case, we wait until prodded, without
         * dispatch counter check.
         */
        if (cpu == target_cpu) {
            return h_confer_self(cpu);
        }

        spapr_cpu = spapr_cpu_state(target_cpu);
        if (!spapr_cpu->vpa_addr || ((dispatch & 1) == 0)) {
            return H_SUCCESS;
        }

        target_dispatch = ldl_be_phys(cs->as,
                                  spapr_cpu->vpa_addr + VPA_DISPATCH_COUNTER);
        if (target_dispatch != dispatch) {
            return H_SUCCESS;
        }

        /*
         * The targeted confer does not do anything special beyond yielding
         * the current vCPU, but even this should be better than nothing.
         * At least for single-threaded tcg, it gives the target a chance to
         * run before we run again. Multi-threaded tcg does not really do
         * anything with EXCP_YIELD yet.
         */
    }

    cs->exception_index = EXCP_YIELD;
    cs->exit_request = 1;
    cpu_loop_exit(cs);

    return H_SUCCESS;
}

static target_ulong h_prod(PowerPCCPU *cpu, SpaprMachineState *spapr,
                           target_ulong opcode, target_ulong *args)
{
    target_long target = args[0];
    PowerPCCPU *tcpu;
    CPUState *cs;
    SpaprCpuState *spapr_cpu;

    tcpu = spapr_find_cpu(target);
    cs = CPU(tcpu);
    if (!cs) {
        return H_PARAMETER;
    }

    spapr_cpu = spapr_cpu_state(tcpu);
    spapr_cpu->prod = true;
    cs->halted = 0;
    qemu_cpu_kick(cs);

    return H_SUCCESS;
}

static target_ulong h_rtas(PowerPCCPU *cpu, SpaprMachineState *spapr,
                           target_ulong opcode, target_ulong *args)
{
    target_ulong rtas_r3 = args[0];
    uint32_t token = rtas_ld(rtas_r3, 0);
    uint32_t nargs = rtas_ld(rtas_r3, 1);
    uint32_t nret = rtas_ld(rtas_r3, 2);

    return spapr_rtas_call(cpu, spapr, token, nargs, rtas_r3 + 12,
                           nret, rtas_r3 + 12 + 4*nargs);
}

static target_ulong h_logical_load(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                   target_ulong opcode, target_ulong *args)
{
    CPUState *cs = CPU(cpu);
    target_ulong size = args[0];
    target_ulong addr = args[1];

    switch (size) {
    case 1:
        args[0] = ldub_phys(cs->as, addr);
        return H_SUCCESS;
    case 2:
        args[0] = lduw_phys(cs->as, addr);
        return H_SUCCESS;
    case 4:
        args[0] = ldl_phys(cs->as, addr);
        return H_SUCCESS;
    case 8:
        args[0] = ldq_phys(cs->as, addr);
        return H_SUCCESS;
    }
    return H_PARAMETER;
}

static target_ulong h_logical_store(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                    target_ulong opcode, target_ulong *args)
{
    CPUState *cs = CPU(cpu);

    target_ulong size = args[0];
    target_ulong addr = args[1];
    target_ulong val  = args[2];

    switch (size) {
    case 1:
        stb_phys(cs->as, addr, val);
        return H_SUCCESS;
    case 2:
        stw_phys(cs->as, addr, val);
        return H_SUCCESS;
    case 4:
        stl_phys(cs->as, addr, val);
        return H_SUCCESS;
    case 8:
        stq_phys(cs->as, addr, val);
        return H_SUCCESS;
    }
    return H_PARAMETER;
}

static target_ulong h_logical_memop(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                    target_ulong opcode, target_ulong *args)
{
    CPUState *cs = CPU(cpu);

    target_ulong dst   = args[0]; /* Destination address */
    target_ulong src   = args[1]; /* Source address */
    target_ulong esize = args[2]; /* Element size (0=1,1=2,2=4,3=8) */
    target_ulong count = args[3]; /* Element count */
    target_ulong op    = args[4]; /* 0 = copy, 1 = invert */
    uint64_t tmp;
    unsigned int mask = (1 << esize) - 1;
    int step = 1 << esize;

    if (count > 0x80000000) {
        return H_PARAMETER;
    }

    if ((dst & mask) || (src & mask) || (op > 1)) {
        return H_PARAMETER;
    }

    if (dst >= src && dst < (src + (count << esize))) {
            dst = dst + ((count - 1) << esize);
            src = src + ((count - 1) << esize);
            step = -step;
    }

    while (count--) {
        switch (esize) {
        case 0:
            tmp = ldub_phys(cs->as, src);
            break;
        case 1:
            tmp = lduw_phys(cs->as, src);
            break;
        case 2:
            tmp = ldl_phys(cs->as, src);
            break;
        case 3:
            tmp = ldq_phys(cs->as, src);
            break;
        default:
            return H_PARAMETER;
        }
        if (op == 1) {
            tmp = ~tmp;
        }
        switch (esize) {
        case 0:
            stb_phys(cs->as, dst, tmp);
            break;
        case 1:
            stw_phys(cs->as, dst, tmp);
            break;
        case 2:
            stl_phys(cs->as, dst, tmp);
            break;
        case 3:
            stq_phys(cs->as, dst, tmp);
            break;
        }
        dst = dst + step;
        src = src + step;
    }

    return H_SUCCESS;
}

static target_ulong h_logical_icbi(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                   target_ulong opcode, target_ulong *args)
{
    /* Nothing to do on emulation, KVM will trap this in the kernel */
    return H_SUCCESS;
}

static target_ulong h_logical_dcbf(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                   target_ulong opcode, target_ulong *args)
{
    /* Nothing to do on emulation, KVM will trap this in the kernel */
    return H_SUCCESS;
}

static target_ulong h_set_mode_resource_le(PowerPCCPU *cpu,
                                           SpaprMachineState *spapr,
                                           target_ulong mflags,
                                           target_ulong value1,
                                           target_ulong value2)
{
    if (value1) {
        return H_P3;
    }
    if (value2) {
        return H_P4;
    }

    switch (mflags) {
    case H_SET_MODE_ENDIAN_BIG:
        spapr_set_all_lpcrs(0, LPCR_ILE);
        spapr_pci_switch_vga(spapr, true);
        return H_SUCCESS;

    case H_SET_MODE_ENDIAN_LITTLE:
        spapr_set_all_lpcrs(LPCR_ILE, LPCR_ILE);
        spapr_pci_switch_vga(spapr, false);
        return H_SUCCESS;
    }

    return H_UNSUPPORTED_FLAG;
}

static target_ulong h_set_mode_resource_addr_trans_mode(PowerPCCPU *cpu,
                                                        target_ulong mflags,
                                                        target_ulong value1,
                                                        target_ulong value2)
{
    PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);

    if (!(pcc->insns_flags2 & PPC2_ISA207S)) {
        return H_P2;
    }
    if (value1) {
        return H_P3;
    }
    if (value2) {
        return H_P4;
    }

    if (mflags == 1) {
        /* AIL=1 is reserved in POWER8/POWER9/POWER10 */
        return H_UNSUPPORTED_FLAG;
    }

    if (mflags == 2 && (pcc->insns_flags2 & PPC2_ISA310)) {
        /* AIL=2 is reserved in POWER10 (ISA v3.1) */
        return H_UNSUPPORTED_FLAG;
    }

    spapr_set_all_lpcrs(mflags << LPCR_AIL_SHIFT, LPCR_AIL);

    return H_SUCCESS;
}

static target_ulong h_set_mode(PowerPCCPU *cpu, SpaprMachineState *spapr,
                               target_ulong opcode, target_ulong *args)
{
    target_ulong resource = args[1];
    target_ulong ret = H_P2;

    switch (resource) {
    case H_SET_MODE_RESOURCE_LE:
        ret = h_set_mode_resource_le(cpu, spapr, args[0], args[2], args[3]);
        break;
    case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
        ret = h_set_mode_resource_addr_trans_mode(cpu, args[0],
                                                  args[2], args[3]);
        break;
    }

    return ret;
}

static target_ulong h_clean_slb(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                target_ulong opcode, target_ulong *args)
{
    qemu_log_mask(LOG_UNIMP, "Unimplemented SPAPR hcall 0x"TARGET_FMT_lx"%s\n",
                  opcode, " (H_CLEAN_SLB)");
    return H_FUNCTION;
}

static target_ulong h_invalidate_pid(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                     target_ulong opcode, target_ulong *args)
{
    qemu_log_mask(LOG_UNIMP, "Unimplemented SPAPR hcall 0x"TARGET_FMT_lx"%s\n",
                  opcode, " (H_INVALIDATE_PID)");
    return H_FUNCTION;
}

static void spapr_check_setup_free_hpt(SpaprMachineState *spapr,
                                       uint64_t patbe_old, uint64_t patbe_new)
{
    /*
     * We have 4 Options:
     * HASH->HASH || RADIX->RADIX || NOTHING->RADIX : Do Nothing
     * HASH->RADIX                                  : Free HPT
     * RADIX->HASH                                  : Allocate HPT
     * NOTHING->HASH                                : Allocate HPT
     * Note: NOTHING implies the case where we said the guest could choose
     *       later and so assumed radix and now it's called H_REG_PROC_TBL
     */

    if ((patbe_old & PATE1_GR) == (patbe_new & PATE1_GR)) {
        /* We assume RADIX, so this catches all the "Do Nothing" cases */
    } else if (!(patbe_old & PATE1_GR)) {
        /* HASH->RADIX : Free HPT */
        spapr_free_hpt(spapr);
    } else if (!(patbe_new & PATE1_GR)) {
        /* RADIX->HASH || NOTHING->HASH : Allocate HPT */
        spapr_setup_hpt(spapr);
    }
    return;
}

#define FLAGS_MASK              0x01FULL
#define FLAG_MODIFY             0x10
#define FLAG_REGISTER           0x08
#define FLAG_RADIX              0x04
#define FLAG_HASH_PROC_TBL      0x02
#define FLAG_GTSE               0x01

static target_ulong h_register_process_table(PowerPCCPU *cpu,
                                             SpaprMachineState *spapr,
                                             target_ulong opcode,
                                             target_ulong *args)
{
    target_ulong flags = args[0];
    target_ulong proc_tbl = args[1];
    target_ulong page_size = args[2];
    target_ulong table_size = args[3];
    target_ulong update_lpcr = 0;
    target_ulong table_byte_size;
    uint64_t cproc;

    if (flags & ~FLAGS_MASK) { /* Check no reserved bits are set */
        return H_PARAMETER;
    }
    if (flags & FLAG_MODIFY) {
        if (flags & FLAG_REGISTER) {
            /* Check process table alignment */
            table_byte_size = 1ULL << (table_size + 12);
            if (proc_tbl & (table_byte_size - 1)) {
                qemu_log_mask(LOG_GUEST_ERROR,
                    "%s: process table not properly aligned: proc_tbl 0x"
                    TARGET_FMT_lx" proc_tbl_size 0x"TARGET_FMT_lx"\n",
                    __func__, proc_tbl, table_byte_size);
            }
            if (flags & FLAG_RADIX) { /* Register new RADIX process table */
                if (proc_tbl & 0xfff || proc_tbl >> 60) {
                    return H_P2;
                } else if (page_size) {
                    return H_P3;
                } else if (table_size > 24) {
                    return H_P4;
                }
                cproc = PATE1_GR | proc_tbl | table_size;
            } else { /* Register new HPT process table */
                if (flags & FLAG_HASH_PROC_TBL) { /* Hash with Segment Tables */
                    /* TODO - Not Supported */
                    /* Technically caused by flag bits => H_PARAMETER */
                    return H_PARAMETER;
                } else { /* Hash with SLB */
                    if (proc_tbl >> 38) {
                        return H_P2;
                    } else if (page_size & ~0x7) {
                        return H_P3;
                    } else if (table_size > 24) {
                        return H_P4;
                    }
                }
                cproc = (proc_tbl << 25) | page_size << 5 | table_size;
            }

        } else { /* Deregister current process table */
            /*
             * Set to benign value: (current GR) | 0. This allows
             * deregistration in KVM to succeed even if the radix bit
             * in flags doesn't match the radix bit in the old PATE.
             */
            cproc = spapr->patb_entry & PATE1_GR;
        }
    } else { /* Maintain current registration */
        if (!(flags & FLAG_RADIX) != !(spapr->patb_entry & PATE1_GR)) {
            /* Technically caused by flag bits => H_PARAMETER */
            return H_PARAMETER; /* Existing Process Table Mismatch */
        }
        cproc = spapr->patb_entry;
    }

    /* Check if we need to setup OR free the hpt */
    spapr_check_setup_free_hpt(spapr, spapr->patb_entry, cproc);

    spapr->patb_entry = cproc; /* Save new process table */

    /* Update the UPRT, HR and GTSE bits in the LPCR for all cpus */
    if (flags & FLAG_RADIX)     /* Radix must use process tables, also set HR */
        update_lpcr |= (LPCR_UPRT | LPCR_HR);
    else if (flags & FLAG_HASH_PROC_TBL) /* Hash with process tables */
        update_lpcr |= LPCR_UPRT;
    if (flags & FLAG_GTSE)      /* Guest translation shootdown enable */
        update_lpcr |= LPCR_GTSE;

    spapr_set_all_lpcrs(update_lpcr, LPCR_UPRT | LPCR_HR | LPCR_GTSE);

    if (kvm_enabled()) {
        return kvmppc_configure_v3_mmu(cpu, flags & FLAG_RADIX,
                                       flags & FLAG_GTSE, cproc);
    }
    return H_SUCCESS;
}

#define H_SIGNAL_SYS_RESET_ALL         -1
#define H_SIGNAL_SYS_RESET_ALLBUTSELF  -2

static target_ulong h_signal_sys_reset(PowerPCCPU *cpu,
                                       SpaprMachineState *spapr,
                                       target_ulong opcode, target_ulong *args)
{
    target_long target = args[0];
    CPUState *cs;

    if (target < 0) {
        /* Broadcast */
        if (target < H_SIGNAL_SYS_RESET_ALLBUTSELF) {
            return H_PARAMETER;
        }

        CPU_FOREACH(cs) {
            PowerPCCPU *c = POWERPC_CPU(cs);

            if (target == H_SIGNAL_SYS_RESET_ALLBUTSELF) {
                if (c == cpu) {
                    continue;
                }
            }
            run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL);
        }
        return H_SUCCESS;

    } else {
        /* Unicast */
        cs = CPU(spapr_find_cpu(target));
        if (cs) {
            run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL);
            return H_SUCCESS;
        }
        return H_PARAMETER;
    }
}

/* Returns either a logical PVR or zero if none was found */
static uint32_t cas_check_pvr(PowerPCCPU *cpu, uint32_t max_compat,
                              target_ulong *addr, bool *raw_mode_supported)
{
    bool explicit_match = false; /* Matched the CPU's real PVR */
    uint32_t best_compat = 0;
    int i;

    /*
     * We scan the supplied table of PVRs looking for two things
     *   1. Is our real CPU PVR in the list?
     *   2. What's the "best" listed logical PVR
     */
    for (i = 0; i < 512; ++i) {
        uint32_t pvr, pvr_mask;

        pvr_mask = ldl_be_phys(&address_space_memory, *addr);
        pvr = ldl_be_phys(&address_space_memory, *addr + 4);
        *addr += 8;

        if (~pvr_mask & pvr) {
            break; /* Terminator record */
        }

        if ((cpu->env.spr[SPR_PVR] & pvr_mask) == (pvr & pvr_mask)) {
            explicit_match = true;
        } else {
            if (ppc_check_compat(cpu, pvr, best_compat, max_compat)) {
                best_compat = pvr;
            }
        }
    }

    *raw_mode_supported = explicit_match;

    /* Parsing finished */
    trace_spapr_cas_pvr(cpu->compat_pvr, explicit_match, best_compat);

    return best_compat;
}

static
target_ulong do_client_architecture_support(PowerPCCPU *cpu,
                                            SpaprMachineState *spapr,
                                            target_ulong vec,
                                            target_ulong fdt_bufsize)
{
    target_ulong ov_table; /* Working address in data buffer */
    uint32_t cas_pvr;
    SpaprOptionVector *ov1_guest, *ov5_guest;
    bool guest_radix;
    bool raw_mode_supported = false;
    bool guest_xive;
    CPUState *cs;
    void *fdt;
    uint32_t max_compat = spapr->max_compat_pvr;

    /* CAS is supposed to be called early when only the boot vCPU is active. */
    CPU_FOREACH(cs) {
        if (cs == CPU(cpu)) {
            continue;
        }
        if (!cs->halted) {
            warn_report("guest has multiple active vCPUs at CAS, which is not allowed");
            return H_MULTI_THREADS_ACTIVE;
        }
    }

    cas_pvr = cas_check_pvr(cpu, max_compat, &vec, &raw_mode_supported);
    if (!cas_pvr && (!raw_mode_supported || max_compat)) {
        /*
         * We couldn't find a suitable compatibility mode, and either
         * the guest doesn't support "raw" mode for this CPU, or "raw"
         * mode is disabled because a maximum compat mode is set.
         */
        error_report("Couldn't negotiate a suitable PVR during CAS");
        return H_HARDWARE;
    }

    /* Update CPUs */
    if (cpu->compat_pvr != cas_pvr) {
        Error *local_err = NULL;

        if (ppc_set_compat_all(cas_pvr, &local_err) < 0) {
            /* We fail to set compat mode (likely because running with KVM PR),
             * but maybe we can fallback to raw mode if the guest supports it.
             */
            if (!raw_mode_supported) {
                error_report_err(local_err);
                return H_HARDWARE;
            }
            error_free(local_err);
        }
    }

    /* For the future use: here @ov_table points to the first option vector */
    ov_table = vec;

    ov1_guest = spapr_ovec_parse_vector(ov_table, 1);
    if (!ov1_guest) {
        warn_report("guest didn't provide option vector 1");
        return H_PARAMETER;
    }
    ov5_guest = spapr_ovec_parse_vector(ov_table, 5);
    if (!ov5_guest) {
        spapr_ovec_cleanup(ov1_guest);
        warn_report("guest didn't provide option vector 5");
        return H_PARAMETER;
    }
    if (spapr_ovec_test(ov5_guest, OV5_MMU_BOTH)) {
        error_report("guest requested hash and radix MMU, which is invalid.");
        exit(EXIT_FAILURE);
    }
    if (spapr_ovec_test(ov5_guest, OV5_XIVE_BOTH)) {
        error_report("guest requested an invalid interrupt mode");
        exit(EXIT_FAILURE);
    }

    guest_radix = spapr_ovec_test(ov5_guest, OV5_MMU_RADIX_300);

    guest_xive = spapr_ovec_test(ov5_guest, OV5_XIVE_EXPLOIT);

    /*
     * HPT resizing is a bit of a special case, because when enabled
     * we assume an HPT guest will support it until it says it
     * doesn't, instead of assuming it won't support it until it says
     * it does.  Strictly speaking that approach could break for
     * guests which don't make a CAS call, but those are so old we
     * don't care about them.  Without that assumption we'd have to
     * make at least a temporary allocation of an HPT sized for max
     * memory, which could be impossibly difficult under KVM HV if
     * maxram is large.
     */
    if (!guest_radix && !spapr_ovec_test(ov5_guest, OV5_HPT_RESIZE)) {
        int maxshift = spapr_hpt_shift_for_ramsize(MACHINE(spapr)->maxram_size);

        if (spapr->resize_hpt == SPAPR_RESIZE_HPT_REQUIRED) {
            error_report(
                "h_client_architecture_support: Guest doesn't support HPT resizing, but resize-hpt=required");
            exit(1);
        }

        if (spapr->htab_shift < maxshift) {
            /* Guest doesn't know about HPT resizing, so we
             * pre-emptively resize for the maximum permitted RAM.  At
             * the point this is called, nothing should have been
             * entered into the existing HPT */
            spapr_reallocate_hpt(spapr, maxshift, &error_fatal);
            push_sregs_to_kvm_pr(spapr);
        }
    }

    /* NOTE: there are actually a number of ov5 bits where input from the
     * guest is always zero, and the platform/QEMU enables them independently
     * of guest input. To model these properly we'd want some sort of mask,
     * but since they only currently apply to memory migration as defined
     * by LoPAPR 1.1, 14.5.4.8, which QEMU doesn't implement, we don't need
     * to worry about this for now.
     */

    /* full range of negotiated ov5 capabilities */
    spapr_ovec_intersect(spapr->ov5_cas, spapr->ov5, ov5_guest);
    spapr_ovec_cleanup(ov5_guest);

    spapr_check_mmu_mode(guest_radix);

    spapr->cas_pre_isa3_guest = !spapr_ovec_test(ov1_guest, OV1_PPC_3_00);
    spapr_ovec_cleanup(ov1_guest);

    /*
     * Check for NUMA affinity conditions now that we know which NUMA
     * affinity the guest will use.
     */
    spapr_numa_associativity_check(spapr);

    /*
     * Ensure the guest asks for an interrupt mode we support;
     * otherwise terminate the boot.
     */
    if (guest_xive) {
        if (!spapr->irq->xive) {
            error_report(
"Guest requested unavailable interrupt mode (XIVE), try the ic-mode=xive or ic-mode=dual machine property");
            exit(EXIT_FAILURE);
        }
    } else {
        if (!spapr->irq->xics) {
            error_report(
"Guest requested unavailable interrupt mode (XICS), either don't set the ic-mode machine property or try ic-mode=xics or ic-mode=dual");
            exit(EXIT_FAILURE);
        }
    }

    spapr_irq_update_active_intc(spapr);

    /*
     * Process all pending hot-plug/unplug requests now. An updated full
     * rendered FDT will be returned to the guest.
     */
    spapr_drc_reset_all(spapr);
    spapr_clear_pending_hotplug_events(spapr);

    /*
     * If spapr_machine_reset() did not set up a HPT but one is necessary
     * (because the guest isn't going to use radix) then set it up here.
     */
    if ((spapr->patb_entry & PATE1_GR) && !guest_radix) {
        /* legacy hash or new hash: */
        spapr_setup_hpt(spapr);
    }

    fdt = spapr_build_fdt(spapr, spapr->vof != NULL, fdt_bufsize);
    g_free(spapr->fdt_blob);
    spapr->fdt_size = fdt_totalsize(fdt);
    spapr->fdt_initial_size = spapr->fdt_size;
    spapr->fdt_blob = fdt;

    return H_SUCCESS;
}

static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
                                                  SpaprMachineState *spapr,
                                                  target_ulong opcode,
                                                  target_ulong *args)
{
    target_ulong vec = ppc64_phys_to_real(args[0]);
    target_ulong fdt_buf = args[1];
    target_ulong fdt_bufsize = args[2];
    target_ulong ret;
    SpaprDeviceTreeUpdateHeader hdr = { .version_id = 1 };

    if (fdt_bufsize < sizeof(hdr)) {
        error_report("SLOF provided insufficient CAS buffer "
                     TARGET_FMT_lu " (min: %zu)", fdt_bufsize, sizeof(hdr));
        exit(EXIT_FAILURE);
    }

    fdt_bufsize -= sizeof(hdr);

    ret = do_client_architecture_support(cpu, spapr, vec, fdt_bufsize);
    if (ret == H_SUCCESS) {
        _FDT((fdt_pack(spapr->fdt_blob)));
        spapr->fdt_size = fdt_totalsize(spapr->fdt_blob);
        spapr->fdt_initial_size = spapr->fdt_size;

        cpu_physical_memory_write(fdt_buf, &hdr, sizeof(hdr));
        cpu_physical_memory_write(fdt_buf + sizeof(hdr), spapr->fdt_blob,
                                  spapr->fdt_size);
        trace_spapr_cas_continue(spapr->fdt_size + sizeof(hdr));
    }

    return ret;
}

target_ulong spapr_vof_client_architecture_support(MachineState *ms,
                                                   CPUState *cs,
                                                   target_ulong ovec_addr)
{
    SpaprMachineState *spapr = SPAPR_MACHINE(ms);

    target_ulong ret = do_client_architecture_support(POWERPC_CPU(cs), spapr,
                                                      ovec_addr, FDT_MAX_SIZE);

    /*
     * This adds stdout and generates phandles for boottime and CAS FDTs.
     * It is alright to update the FDT here as do_client_architecture_support()
     * does not pack it.
     */
    spapr_vof_client_dt_finalize(spapr, spapr->fdt_blob);

    return ret;
}

static target_ulong h_get_cpu_characteristics(PowerPCCPU *cpu,
                                              SpaprMachineState *spapr,
                                              target_ulong opcode,
                                              target_ulong *args)
{
    uint64_t characteristics = H_CPU_CHAR_HON_BRANCH_HINTS &
                               ~H_CPU_CHAR_THR_RECONF_TRIG;
    uint64_t behaviour = H_CPU_BEHAV_FAVOUR_SECURITY;
    uint8_t safe_cache = spapr_get_cap(spapr, SPAPR_CAP_CFPC);
    uint8_t safe_bounds_check = spapr_get_cap(spapr, SPAPR_CAP_SBBC);
    uint8_t safe_indirect_branch = spapr_get_cap(spapr, SPAPR_CAP_IBS);
    uint8_t count_cache_flush_assist = spapr_get_cap(spapr,
                                                     SPAPR_CAP_CCF_ASSIST);

    switch (safe_cache) {
    case SPAPR_CAP_WORKAROUND:
        characteristics |= H_CPU_CHAR_L1D_FLUSH_ORI30;
        characteristics |= H_CPU_CHAR_L1D_FLUSH_TRIG2;
        characteristics |= H_CPU_CHAR_L1D_THREAD_PRIV;
        behaviour |= H_CPU_BEHAV_L1D_FLUSH_PR;
        break;
    case SPAPR_CAP_FIXED:
        behaviour |= H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY;
        behaviour |= H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS;
        break;
    default: /* broken */
        assert(safe_cache == SPAPR_CAP_BROKEN);
        behaviour |= H_CPU_BEHAV_L1D_FLUSH_PR;
        break;
    }

    switch (safe_bounds_check) {
    case SPAPR_CAP_WORKAROUND:
        characteristics |= H_CPU_CHAR_SPEC_BAR_ORI31;
        behaviour |= H_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
        break;
    case SPAPR_CAP_FIXED:
        break;
    default: /* broken */
        assert(safe_bounds_check == SPAPR_CAP_BROKEN);
        behaviour |= H_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
        break;
    }

    switch (safe_indirect_branch) {
    case SPAPR_CAP_FIXED_NA:
        break;
    case SPAPR_CAP_FIXED_CCD:
        characteristics |= H_CPU_CHAR_CACHE_COUNT_DIS;
        break;
    case SPAPR_CAP_FIXED_IBS:
        characteristics |= H_CPU_CHAR_BCCTRL_SERIALISED;
        break;
    case SPAPR_CAP_WORKAROUND:
        behaviour |= H_CPU_BEHAV_FLUSH_COUNT_CACHE;
        if (count_cache_flush_assist) {
            characteristics |= H_CPU_CHAR_BCCTR_FLUSH_ASSIST;
        }
        break;
    default: /* broken */
        assert(safe_indirect_branch == SPAPR_CAP_BROKEN);
        break;
    }

    args[0] = characteristics;
    args[1] = behaviour;
    return H_SUCCESS;
}

static target_ulong h_update_dt(PowerPCCPU *cpu, SpaprMachineState *spapr,
                                target_ulong opcode, target_ulong *args)
{
    target_ulong dt = ppc64_phys_to_real(args[0]);
    struct fdt_header hdr = { 0 };
    unsigned cb;
    SpaprMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
    void *fdt;

    cpu_physical_memory_read(dt, &hdr, sizeof(hdr));
    cb = fdt32_to_cpu(hdr.totalsize);

    if (!smc->update_dt_enabled) {
        return H_SUCCESS;
    }

    /* Check that the fdt did not grow out of proportion */
    if (cb > spapr->fdt_initial_size * 2) {
        trace_spapr_update_dt_failed_size(spapr->fdt_initial_size, cb,
                                          fdt32_to_cpu(hdr.magic));
        return H_PARAMETER;
    }

    fdt = g_malloc0(cb);
    cpu_physical_memory_read(dt, fdt, cb);

    /* Check the fdt consistency */
    if (fdt_check_full(fdt, cb)) {
        trace_spapr_update_dt_failed_check(spapr->fdt_initial_size, cb,
                                           fdt32_to_cpu(hdr.magic));
        return H_PARAMETER;
    }

    g_free(spapr->fdt_blob);
    spapr->fdt_size = cb;
    spapr->fdt_blob = fdt;
    trace_spapr_update_dt(cb);

    return H_SUCCESS;
}

static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE + 1];
static spapr_hcall_fn svm_hypercall_table[(SVM_HCALL_MAX - SVM_HCALL_BASE) / 4 + 1];

void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
{
    spapr_hcall_fn *slot;

    if (opcode <= MAX_HCALL_OPCODE) {
        assert((opcode & 0x3) == 0);

        slot = &papr_hypercall_table[opcode / 4];
    } else if (opcode >= SVM_HCALL_BASE && opcode <= SVM_HCALL_MAX) {
        /* we only have SVM-related hcall numbers assigned in multiples of 4 */
        assert((opcode & 0x3) == 0);

        slot = &svm_hypercall_table[(opcode - SVM_HCALL_BASE) / 4];
    } else {
        assert((opcode >= KVMPPC_HCALL_BASE) && (opcode <= KVMPPC_HCALL_MAX));

        slot = &kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];
    }

    assert(!(*slot));
    *slot = fn;
}

target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode,
                             target_ulong *args)
{
    SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());

    if ((opcode <= MAX_HCALL_OPCODE)
        && ((opcode & 0x3) == 0)) {
        spapr_hcall_fn fn = papr_hypercall_table[opcode / 4];

        if (fn) {
            return fn(cpu, spapr, opcode, args);
        }
    } else if ((opcode >= SVM_HCALL_BASE) &&
               (opcode <= SVM_HCALL_MAX)) {
        spapr_hcall_fn fn = svm_hypercall_table[(opcode - SVM_HCALL_BASE) / 4];

        if (fn) {
            return fn(cpu, spapr, opcode, args);
        }
    } else if ((opcode >= KVMPPC_HCALL_BASE) &&
               (opcode <= KVMPPC_HCALL_MAX)) {
        spapr_hcall_fn fn = kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];

        if (fn) {
            return fn(cpu, spapr, opcode, args);
        }
    }

    qemu_log_mask(LOG_UNIMP, "Unimplemented SPAPR hcall 0x" TARGET_FMT_lx "\n",
                  opcode);
    return H_FUNCTION;
}

#ifdef CONFIG_TCG
#define PRTS_MASK      0x1f

static target_ulong h_set_ptbl(PowerPCCPU *cpu,
                               SpaprMachineState *spapr,
                               target_ulong opcode,
                               target_ulong *args)
{
    target_ulong ptcr = args[0];

    if (!spapr_get_cap(spapr, SPAPR_CAP_NESTED_KVM_HV)) {
        return H_FUNCTION;
    }

    if ((ptcr & PRTS_MASK) + 12 - 4 > 12) {
        return H_PARAMETER;
    }

    spapr->nested_ptcr = ptcr; /* Save new partition table */

    return H_SUCCESS;
}

static target_ulong h_tlb_invalidate(PowerPCCPU *cpu,
                                     SpaprMachineState *spapr,
                                     target_ulong opcode,
                                     target_ulong *args)
{
    /*
     * The spapr virtual hypervisor nested HV implementation retains no L2
     * translation state except for TLB. And the TLB is always invalidated
     * across L1<->L2 transitions, so nothing is required here.
     */

    return H_SUCCESS;
}

static target_ulong h_copy_tofrom_guest(PowerPCCPU *cpu,
                                        SpaprMachineState *spapr,
                                        target_ulong opcode,
                                        target_ulong *args)
{
    /*
     * This HCALL is not required, L1 KVM will take a slow path and walk the
     * page tables manually to do the data copy.
     */
    return H_FUNCTION;
}

/*
 * When this handler returns, the environment is switched to the L2 guest
 * and TCG begins running that. spapr_exit_nested() performs the switch from
 * L2 back to L1 and returns from the H_ENTER_NESTED hcall.
 */
static target_ulong h_enter_nested(PowerPCCPU *cpu,
                                   SpaprMachineState *spapr,
                                   target_ulong opcode,
                                   target_ulong *args)
{
    PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
    CPUState *cs = CPU(cpu);
    CPUPPCState *env = &cpu->env;
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
    target_ulong hv_ptr = args[0];
    target_ulong regs_ptr = args[1];
    target_ulong hdec, now = cpu_ppc_load_tbl(env);
    target_ulong lpcr, lpcr_mask;
    struct kvmppc_hv_guest_state *hvstate;
    struct kvmppc_hv_guest_state hv_state;
    struct kvmppc_pt_regs *regs;
    hwaddr len;
    uint64_t cr;
    int i;

    if (spapr->nested_ptcr == 0) {
        return H_NOT_AVAILABLE;
    }

    len = sizeof(*hvstate);
    hvstate = address_space_map(CPU(cpu)->as, hv_ptr, &len, false,
                                MEMTXATTRS_UNSPECIFIED);
    if (len != sizeof(*hvstate)) {
        address_space_unmap(CPU(cpu)->as, hvstate, len, 0, false);
        return H_PARAMETER;
    }

    memcpy(&hv_state, hvstate, len);

    address_space_unmap(CPU(cpu)->as, hvstate, len, len, false);

    /*
     * We accept versions 1 and 2. Version 2 fields are unused because TCG
     * does not implement DAWR*.
     */
    if (hv_state.version > HV_GUEST_STATE_VERSION) {
        return H_PARAMETER;
    }

    spapr_cpu->nested_host_state = g_try_new(CPUPPCState, 1);
    if (!spapr_cpu->nested_host_state) {
        return H_NO_MEM;
    }

    memcpy(spapr_cpu->nested_host_state, env, sizeof(CPUPPCState));

    len = sizeof(*regs);
    regs = address_space_map(CPU(cpu)->as, regs_ptr, &len, false,
                                MEMTXATTRS_UNSPECIFIED);
    if (!regs || len != sizeof(*regs)) {
        address_space_unmap(CPU(cpu)->as, regs, len, 0, false);
        g_free(spapr_cpu->nested_host_state);
        return H_P2;
    }

    len = sizeof(env->gpr);
    assert(len == sizeof(regs->gpr));
    memcpy(env->gpr, regs->gpr, len);

    env->lr = regs->link;
    env->ctr = regs->ctr;
    cpu_write_xer(env, regs->xer);

    cr = regs->ccr;
    for (i = 7; i >= 0; i--) {
        env->crf[i] = cr & 15;
        cr >>= 4;
    }

    env->msr = regs->msr;
    env->nip = regs->nip;

    address_space_unmap(CPU(cpu)->as, regs, len, len, false);

    env->cfar = hv_state.cfar;

    assert(env->spr[SPR_LPIDR] == 0);
    env->spr[SPR_LPIDR] = hv_state.lpid;

    lpcr_mask = LPCR_DPFD | LPCR_ILE | LPCR_AIL | LPCR_LD | LPCR_MER;
    lpcr = (env->spr[SPR_LPCR] & ~lpcr_mask) | (hv_state.lpcr & lpcr_mask);
    lpcr |= LPCR_HR | LPCR_UPRT | LPCR_GTSE | LPCR_HVICE | LPCR_HDICE;
    lpcr &= ~LPCR_LPES0;
    env->spr[SPR_LPCR] = lpcr & pcc->lpcr_mask;

    env->spr[SPR_PCR] = hv_state.pcr;
    /* hv_state.amor is not used */
    env->spr[SPR_DPDES] = hv_state.dpdes;
    env->spr[SPR_HFSCR] = hv_state.hfscr;
    hdec = hv_state.hdec_expiry - now;
    spapr_cpu->nested_tb_offset = hv_state.tb_offset;
    /* TCG does not implement DAWR*, CIABR, PURR, SPURR, IC, VTB, HEIR SPRs*/
    env->spr[SPR_SRR0] = hv_state.srr0;
    env->spr[SPR_SRR1] = hv_state.srr1;
    env->spr[SPR_SPRG0] = hv_state.sprg[0];
    env->spr[SPR_SPRG1] = hv_state.sprg[1];
    env->spr[SPR_SPRG2] = hv_state.sprg[2];
    env->spr[SPR_SPRG3] = hv_state.sprg[3];
    env->spr[SPR_BOOKS_PID] = hv_state.pidr;
    env->spr[SPR_PPR] = hv_state.ppr;

    cpu_ppc_hdecr_init(env);
    cpu_ppc_store_hdecr(env, hdec);

    /*
     * The hv_state.vcpu_token is not needed. It is used by the KVM
     * implementation to remember which L2 vCPU last ran on which physical
     * CPU so as to invalidate process scope translations if it is moved
     * between physical CPUs. For now TLBs are always flushed on L1<->L2
     * transitions so this is not a problem.
     *
     * Could validate that the same vcpu_token does not attempt to run on
     * different L1 vCPUs at the same time, but that would be a L1 KVM bug
     * and it's not obviously worth a new data structure to do it.
     */

    env->tb_env->tb_offset += spapr_cpu->nested_tb_offset;
    spapr_cpu->in_nested = true;

    hreg_compute_hflags(env);
    tlb_flush(cs);
    env->reserve_addr = -1; /* Reset the reservation */

    /*
     * The spapr hcall helper sets env->gpr[3] to the return value, but at
     * this point the L1 is not returning from the hcall but rather we
     * start running the L2, so r3 must not be clobbered, so return env->gpr[3]
     * to leave it unchanged.
     */
    return env->gpr[3];
}

void spapr_exit_nested(PowerPCCPU *cpu, int excp)
{
    CPUState *cs = CPU(cpu);
    CPUPPCState *env = &cpu->env;
    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
    target_ulong r3_return = env->excp_vectors[excp]; /* hcall return value */
    target_ulong hv_ptr = spapr_cpu->nested_host_state->gpr[4];
    target_ulong regs_ptr = spapr_cpu->nested_host_state->gpr[5];
    struct kvmppc_hv_guest_state *hvstate;
    struct kvmppc_pt_regs *regs;
    hwaddr len;
    uint64_t cr;
    int i;

    assert(spapr_cpu->in_nested);

    cpu_ppc_hdecr_exit(env);

    len = sizeof(*hvstate);
    hvstate = address_space_map(CPU(cpu)->as, hv_ptr, &len, true,
                                MEMTXATTRS_UNSPECIFIED);
    if (len != sizeof(*hvstate)) {
        address_space_unmap(CPU(cpu)->as, hvstate, len, 0, true);
        r3_return = H_PARAMETER;
        goto out_restore_l1;
    }

    hvstate->cfar = env->cfar;
    hvstate->lpcr = env->spr[SPR_LPCR];
    hvstate->pcr = env->spr[SPR_PCR];
    hvstate->dpdes = env->spr[SPR_DPDES];
    hvstate->hfscr = env->spr[SPR_HFSCR];

    if (excp == POWERPC_EXCP_HDSI) {
        hvstate->hdar = env->spr[SPR_HDAR];
        hvstate->hdsisr = env->spr[SPR_HDSISR];
        hvstate->asdr = env->spr[SPR_ASDR];
    } else if (excp == POWERPC_EXCP_HISI) {
        hvstate->asdr = env->spr[SPR_ASDR];
    }

    /* HEIR should be implemented for HV mode and saved here. */
    hvstate->srr0 = env->spr[SPR_SRR0];
    hvstate->srr1 = env->spr[SPR_SRR1];
    hvstate->sprg[0] = env->spr[SPR_SPRG0];
    hvstate->sprg[1] = env->spr[SPR_SPRG1];
    hvstate->sprg[2] = env->spr[SPR_SPRG2];
    hvstate->sprg[3] = env->spr[SPR_SPRG3];
    hvstate->pidr = env->spr[SPR_BOOKS_PID];
    hvstate->ppr = env->spr[SPR_PPR];

    /* Is it okay to specify write length larger than actual data written? */
    address_space_unmap(CPU(cpu)->as, hvstate, len, len, true);

    len = sizeof(*regs);
    regs = address_space_map(CPU(cpu)->as, regs_ptr, &len, true,
                                MEMTXATTRS_UNSPECIFIED);
    if (!regs || len != sizeof(*regs)) {
        address_space_unmap(CPU(cpu)->as, regs, len, 0, true);
        r3_return = H_P2;
        goto out_restore_l1;
    }

    len = sizeof(env->gpr);
    assert(len == sizeof(regs->gpr));
    memcpy(regs->gpr, env->gpr, len);

    regs->link = env->lr;
    regs->ctr = env->ctr;
    regs->xer = cpu_read_xer(env);

    cr = 0;
    for (i = 0; i < 8; i++) {
        cr |= (env->crf[i] & 15) << (4 * (7 - i));
    }
    regs->ccr = cr;

    if (excp == POWERPC_EXCP_MCHECK ||
        excp == POWERPC_EXCP_RESET ||
        excp == POWERPC_EXCP_SYSCALL) {
        regs->nip = env->spr[SPR_SRR0];
        regs->msr = env->spr[SPR_SRR1] & env->msr_mask;
    } else {
        regs->nip = env->spr[SPR_HSRR0];
        regs->msr = env->spr[SPR_HSRR1] & env->msr_mask;
    }

    /* Is it okay to specify write length larger than actual data written? */
    address_space_unmap(CPU(cpu)->as, regs, len, len, true);

out_restore_l1:
    memcpy(env->gpr, spapr_cpu->nested_host_state->gpr, sizeof(env->gpr));
    env->lr = spapr_cpu->nested_host_state->lr;
    env->ctr = spapr_cpu->nested_host_state->ctr;
    memcpy(env->crf, spapr_cpu->nested_host_state->crf, sizeof(env->crf));
    env->cfar = spapr_cpu->nested_host_state->cfar;
    env->xer = spapr_cpu->nested_host_state->xer;
    env->so = spapr_cpu->nested_host_state->so;
    env->ov = spapr_cpu->nested_host_state->ov;
    env->ov32 = spapr_cpu->nested_host_state->ov32;
    env->ca32 = spapr_cpu->nested_host_state->ca32;
    env->msr = spapr_cpu->nested_host_state->msr;
    env->nip = spapr_cpu->nested_host_state->nip;

    assert(env->spr[SPR_LPIDR] != 0);
    env->spr[SPR_LPCR] = spapr_cpu->nested_host_state->spr[SPR_LPCR];
    env->spr[SPR_LPIDR] = spapr_cpu->nested_host_state->spr[SPR_LPIDR];
    env->spr[SPR_PCR] = spapr_cpu->nested_host_state->spr[SPR_PCR];
    env->spr[SPR_DPDES] = 0;
    env->spr[SPR_HFSCR] = spapr_cpu->nested_host_state->spr[SPR_HFSCR];
    env->spr[SPR_SRR0] = spapr_cpu->nested_host_state->spr[SPR_SRR0];
    env->spr[SPR_SRR1] = spapr_cpu->nested_host_state->spr[SPR_SRR1];
    env->spr[SPR_SPRG0] = spapr_cpu->nested_host_state->spr[SPR_SPRG0];
    env->spr[SPR_SPRG1] = spapr_cpu->nested_host_state->spr[SPR_SPRG1];
    env->spr[SPR_SPRG2] = spapr_cpu->nested_host_state->spr[SPR_SPRG2];
    env->spr[SPR_SPRG3] = spapr_cpu->nested_host_state->spr[SPR_SPRG3];
    env->spr[SPR_BOOKS_PID] = spapr_cpu->nested_host_state->spr[SPR_BOOKS_PID];
    env->spr[SPR_PPR] = spapr_cpu->nested_host_state->spr[SPR_PPR];

    /*
     * Return the interrupt vector address from H_ENTER_NESTED to the L1
     * (or error code).
     */
    env->gpr[3] = r3_return;

    env->tb_env->tb_offset -= spapr_cpu->nested_tb_offset;
    spapr_cpu->in_nested = false;

    hreg_compute_hflags(env);
    tlb_flush(cs);
    env->reserve_addr = -1; /* Reset the reservation */

    g_free(spapr_cpu->nested_host_state);
    spapr_cpu->nested_host_state = NULL;
}

static void hypercall_register_nested(void)
{
    spapr_register_hypercall(KVMPPC_H_SET_PARTITION_TABLE, h_set_ptbl);
    spapr_register_hypercall(KVMPPC_H_ENTER_NESTED, h_enter_nested);
    spapr_register_hypercall(KVMPPC_H_TLB_INVALIDATE, h_tlb_invalidate);
    spapr_register_hypercall(KVMPPC_H_COPY_TOFROM_GUEST, h_copy_tofrom_guest);
}

static void hypercall_register_softmmu(void)
{
    /* DO NOTHING */
}
#else
void spapr_exit_nested(PowerPCCPU *cpu, int excp)
{
    g_assert_not_reached();
}

static target_ulong h_softmmu(PowerPCCPU *cpu, SpaprMachineState *spapr,
                            target_ulong opcode, target_ulong *args)
{
    g_assert_not_reached();
}

static void hypercall_register_nested(void)
{
    /* DO NOTHING */
}

static void hypercall_register_softmmu(void)
{
    /* hcall-pft */
    spapr_register_hypercall(H_ENTER, h_softmmu);
    spapr_register_hypercall(H_REMOVE, h_softmmu);
    spapr_register_hypercall(H_PROTECT, h_softmmu);
    spapr_register_hypercall(H_READ, h_softmmu);

    /* hcall-bulk */
    spapr_register_hypercall(H_BULK_REMOVE, h_softmmu);
}
#endif

static void hypercall_register_types(void)
{
    hypercall_register_softmmu();

    /* hcall-hpt-resize */
    spapr_register_hypercall(H_RESIZE_HPT_PREPARE, h_resize_hpt_prepare);
    spapr_register_hypercall(H_RESIZE_HPT_COMMIT, h_resize_hpt_commit);

    /* hcall-splpar */
    spapr_register_hypercall(H_REGISTER_VPA, h_register_vpa);
    spapr_register_hypercall(H_CEDE, h_cede);
    spapr_register_hypercall(H_CONFER, h_confer);
    spapr_register_hypercall(H_PROD, h_prod);

    /* hcall-join */
    spapr_register_hypercall(H_JOIN, h_join);

    spapr_register_hypercall(H_SIGNAL_SYS_RESET, h_signal_sys_reset);

    /* processor register resource access h-calls */
    spapr_register_hypercall(H_SET_SPRG0, h_set_sprg0);
    spapr_register_hypercall(H_SET_DABR, h_set_dabr);
    spapr_register_hypercall(H_SET_XDABR, h_set_xdabr);
    spapr_register_hypercall(H_PAGE_INIT, h_page_init);
    spapr_register_hypercall(H_SET_MODE, h_set_mode);

    /* In Memory Table MMU h-calls */
    spapr_register_hypercall(H_CLEAN_SLB, h_clean_slb);
    spapr_register_hypercall(H_INVALIDATE_PID, h_invalidate_pid);
    spapr_register_hypercall(H_REGISTER_PROC_TBL, h_register_process_table);

    /* hcall-get-cpu-characteristics */
    spapr_register_hypercall(H_GET_CPU_CHARACTERISTICS,
                             h_get_cpu_characteristics);

    /* "debugger" hcalls (also used by SLOF). Note: We do -not- differenciate
     * here between the "CI" and the "CACHE" variants, they will use whatever
     * mapping attributes qemu is using. When using KVM, the kernel will
     * enforce the attributes more strongly
     */
    spapr_register_hypercall(H_LOGICAL_CI_LOAD, h_logical_load);
    spapr_register_hypercall(H_LOGICAL_CI_STORE, h_logical_store);
    spapr_register_hypercall(H_LOGICAL_CACHE_LOAD, h_logical_load);
    spapr_register_hypercall(H_LOGICAL_CACHE_STORE, h_logical_store);
    spapr_register_hypercall(H_LOGICAL_ICBI, h_logical_icbi);
    spapr_register_hypercall(H_LOGICAL_DCBF, h_logical_dcbf);
    spapr_register_hypercall(KVMPPC_H_LOGICAL_MEMOP, h_logical_memop);

    /* qemu/KVM-PPC specific hcalls */
    spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);

    /* ibm,client-architecture-support support */
    spapr_register_hypercall(KVMPPC_H_CAS, h_client_architecture_support);

    spapr_register_hypercall(KVMPPC_H_UPDATE_DT, h_update_dt);

    hypercall_register_nested();
}

type_init(hypercall_register_types)