// SPDX-License-Identifier: GPL-2.0
/*
 * hosting IBM Z kernel virtual machines (s390x)
 *
 * Copyright IBM Corp. 2008, 2020
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 *               Heiko Carstens <heiko.carstens@de.ibm.com>
 *               Christian Ehrhardt <ehrhardt@de.ibm.com>
 *               Jason J. Herne <jjherne@us.ibm.com>
 */

#define KMSG_COMPONENT "kvm-s390"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/hrtimer.h>
#include <linux/init.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/mman.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/vmalloc.h>
#include <linux/bitmap.h>
#include <linux/sched/signal.h>
#include <linux/string.h>
#include <linux/pgtable.h>

#include <asm/asm-offsets.h>
#include <asm/lowcore.h>
#include <asm/stp.h>
#include <asm/gmap.h>
#include <asm/nmi.h>
#include <asm/switch_to.h>
#include <asm/isc.h>
#include <asm/sclp.h>
#include <asm/cpacf.h>
#include <asm/timex.h>
#include <asm/ap.h>
#include <asm/uv.h>
#include "kvm-s390.h"
#include "gaccess.h"

#define CREATE_TRACE_POINTS
#include "trace.h"
#include "trace-s390.h"

#define MEM_OP_MAX_SIZE 65536   /* Maximum transfer size for KVM_S390_MEM_OP */
#define LOCAL_IRQS 32
#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
                           (KVM_MAX_VCPUS + LOCAL_IRQS))

struct kvm_stats_debugfs_item debugfs_entries[] = {
        VCPU_STAT("userspace_handled", exit_userspace),
        VCPU_STAT("exit_null", exit_null),
        VCPU_STAT("exit_validity", exit_validity),
        VCPU_STAT("exit_stop_request", exit_stop_request),
        VCPU_STAT("exit_external_request", exit_external_request),
        VCPU_STAT("exit_io_request", exit_io_request),
        VCPU_STAT("exit_external_interrupt", exit_external_interrupt),
        VCPU_STAT("exit_instruction", exit_instruction),
        VCPU_STAT("exit_pei", exit_pei),
        VCPU_STAT("exit_program_interruption", exit_program_interruption),
        VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
        VCPU_STAT("exit_operation_exception", exit_operation_exception),
        VCPU_STAT("halt_successful_poll", halt_successful_poll),
        VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
        VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
        VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
        VCPU_STAT("halt_wakeup", halt_wakeup),
        VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
        VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
        VCPU_STAT("instruction_lctlg", instruction_lctlg),
        VCPU_STAT("instruction_lctl", instruction_lctl),
        VCPU_STAT("instruction_stctl", instruction_stctl),
        VCPU_STAT("instruction_stctg", instruction_stctg),
        VCPU_STAT("deliver_ckc", deliver_ckc),
        VCPU_STAT("deliver_cputm", deliver_cputm),
        VCPU_STAT("deliver_emergency_signal", deliver_emergency_signal),
        VCPU_STAT("deliver_external_call", deliver_external_call),
        VCPU_STAT("deliver_service_signal", deliver_service_signal),
        VCPU_STAT("deliver_virtio", deliver_virtio),
        VCPU_STAT("deliver_stop_signal", deliver_stop_signal),
        VCPU_STAT("deliver_prefix_signal", deliver_prefix_signal),
        VCPU_STAT("deliver_restart_signal", deliver_restart_signal),
        VCPU_STAT("deliver_program", deliver_program),
        VCPU_STAT("deliver_io", deliver_io),
        VCPU_STAT("deliver_machine_check", deliver_machine_check),
        VCPU_STAT("exit_wait_state", exit_wait_state),
        VCPU_STAT("inject_ckc", inject_ckc),
        VCPU_STAT("inject_cputm", inject_cputm),
        VCPU_STAT("inject_external_call", inject_external_call),
        VM_STAT("inject_float_mchk", inject_float_mchk),
        VCPU_STAT("inject_emergency_signal", inject_emergency_signal),
        VM_STAT("inject_io", inject_io),
        VCPU_STAT("inject_mchk", inject_mchk),
        VM_STAT("inject_pfault_done", inject_pfault_done),
        VCPU_STAT("inject_program", inject_program),
        VCPU_STAT("inject_restart", inject_restart),
        VM_STAT("inject_service_signal", inject_service_signal),
        VCPU_STAT("inject_set_prefix", inject_set_prefix),
        VCPU_STAT("inject_stop_signal", inject_stop_signal),
        VCPU_STAT("inject_pfault_init", inject_pfault_init),
        VM_STAT("inject_virtio", inject_virtio),
        VCPU_STAT("instruction_epsw", instruction_epsw),
        VCPU_STAT("instruction_gs", instruction_gs),
        VCPU_STAT("instruction_io_other", instruction_io_other),
        VCPU_STAT("instruction_lpsw", instruction_lpsw),
        VCPU_STAT("instruction_lpswe", instruction_lpswe),
        VCPU_STAT("instruction_pfmf", instruction_pfmf),
        VCPU_STAT("instruction_ptff", instruction_ptff),
        VCPU_STAT("instruction_stidp", instruction_stidp),
        VCPU_STAT("instruction_sck", instruction_sck),
        VCPU_STAT("instruction_sckpf", instruction_sckpf),
        VCPU_STAT("instruction_spx", instruction_spx),
        VCPU_STAT("instruction_stpx", instruction_stpx),
        VCPU_STAT("instruction_stap", instruction_stap),
        VCPU_STAT("instruction_iske", instruction_iske),
        VCPU_STAT("instruction_ri", instruction_ri),
        VCPU_STAT("instruction_rrbe", instruction_rrbe),
        VCPU_STAT("instruction_sske", instruction_sske),
        VCPU_STAT("instruction_ipte_interlock", instruction_ipte_interlock),
        VCPU_STAT("instruction_essa", instruction_essa),
        VCPU_STAT("instruction_stsi", instruction_stsi),
        VCPU_STAT("instruction_stfl", instruction_stfl),
        VCPU_STAT("instruction_tb", instruction_tb),
        VCPU_STAT("instruction_tpi", instruction_tpi),
        VCPU_STAT("instruction_tprot", instruction_tprot),
        VCPU_STAT("instruction_tsch", instruction_tsch),
        VCPU_STAT("instruction_sthyi", instruction_sthyi),
        VCPU_STAT("instruction_sie", instruction_sie),
        VCPU_STAT("instruction_sigp_sense", instruction_sigp_sense),
        VCPU_STAT("instruction_sigp_sense_running", instruction_sigp_sense_running),
        VCPU_STAT("instruction_sigp_external_call", instruction_sigp_external_call),
        VCPU_STAT("instruction_sigp_emergency", instruction_sigp_emergency),
        VCPU_STAT("instruction_sigp_cond_emergency", instruction_sigp_cond_emergency),
        VCPU_STAT("instruction_sigp_start", instruction_sigp_start),
        VCPU_STAT("instruction_sigp_stop", instruction_sigp_stop),
        VCPU_STAT("instruction_sigp_stop_store_status", instruction_sigp_stop_store_status),
        VCPU_STAT("instruction_sigp_store_status", instruction_sigp_store_status),
        VCPU_STAT("instruction_sigp_store_adtl_status", instruction_sigp_store_adtl_status),
        VCPU_STAT("instruction_sigp_set_arch", instruction_sigp_arch),
        VCPU_STAT("instruction_sigp_set_prefix", instruction_sigp_prefix),
        VCPU_STAT("instruction_sigp_restart", instruction_sigp_restart),
        VCPU_STAT("instruction_sigp_cpu_reset", instruction_sigp_cpu_reset),
        VCPU_STAT("instruction_sigp_init_cpu_reset", instruction_sigp_init_cpu_reset),
        VCPU_STAT("instruction_sigp_unknown", instruction_sigp_unknown),
        VCPU_STAT("instruction_diag_10", diagnose_10),
        VCPU_STAT("instruction_diag_44", diagnose_44),
        VCPU_STAT("instruction_diag_9c", diagnose_9c),
        VCPU_STAT("diag_9c_ignored", diagnose_9c_ignored),
        VCPU_STAT("instruction_diag_258", diagnose_258),
        VCPU_STAT("instruction_diag_308", diagnose_308),
        VCPU_STAT("instruction_diag_500", diagnose_500),
        VCPU_STAT("instruction_diag_other", diagnose_other),
        { NULL }
};

struct kvm_s390_tod_clock_ext {
        __u8 epoch_idx;
        __u64 tod;
        __u8 reserved[7];
} __packed;

/* allow nested virtualization in KVM (if enabled by user space) */
static int nested;
module_param(nested, int, S_IRUGO);
MODULE_PARM_DESC(nested, "Nested virtualization support");

/* allow 1m huge page guest backing, if !nested */
static int hpage;
module_param(hpage, int, 0444);
MODULE_PARM_DESC(hpage, "1m huge page backing support");

/* maximum percentage of steal time for polling.  >100 is treated like 100 */
static u8 halt_poll_max_steal = 10;
module_param(halt_poll_max_steal, byte, 0644);
MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");

/* if set to true, the GISA will be initialized and used if available */
static bool use_gisa  = true;
module_param(use_gisa, bool, 0644);
MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it.");

/*
 * For now we handle at most 16 double words as this is what the s390 base
 * kernel handles and stores in the prefix page. If we ever need to go beyond
 * this, this requires changes to code, but the external uapi can stay.
 */
#define SIZE_INTERNAL 16

/*
 * Base feature mask that defines default mask for facilities. Consists of the
 * defines in FACILITIES_KVM and the non-hypervisor managed bits.
 */
static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
/*
 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
 * and defines the facilities that can be enabled via a cpu model.
 */
static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };

static unsigned long kvm_s390_fac_size(void)
{
        BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
        BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
        BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
                sizeof(S390_lowcore.stfle_fac_list));

        return SIZE_INTERNAL;
}

/* available cpu features supported by kvm */
static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
/* available subfunctions indicated via query / "test bit" */
static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;

static struct gmap_notifier gmap_notifier;
static struct gmap_notifier vsie_gmap_notifier;
debug_info_t *kvm_s390_dbf;
debug_info_t *kvm_s390_dbf_uv;

/* Section: not file related */
int kvm_arch_hardware_enable(void)
{
        /* every s390 is virtualization enabled ;-) */
        return 0;
}

int kvm_arch_check_processor_compat(void *opaque)
{
        return 0;
}

/* forward declarations */
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
                              unsigned long end);
static int sca_switch_to_extended(struct kvm *kvm);

static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
{
        u8 delta_idx = 0;

        /*
         * The TOD jumps by delta, we have to compensate this by adding
         * -delta to the epoch.
         */
        delta = -delta;

        /* sign-extension - we're adding to signed values below */
        if ((s64)delta < 0)
                delta_idx = -1;

        scb->epoch += delta;
        if (scb->ecd & ECD_MEF) {
                scb->epdx += delta_idx;
                if (scb->epoch < delta)
                        scb->epdx += 1;
        }
}

/*
 * This callback is executed during stop_machine(). All CPUs are therefore
 * temporarily stopped. In order not to change guest behavior, we have to
 * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 * so a CPU won't be stopped while calculating with the epoch.
 */
static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
                          void *v)
{
        struct kvm *kvm;
        struct kvm_vcpu *vcpu;
        int i;
        unsigned long long *delta = v;

        list_for_each_entry(kvm, &vm_list, vm_list) {
                kvm_for_each_vcpu(i, vcpu, kvm) {
                        kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
                        if (i == 0) {
                                kvm->arch.epoch = vcpu->arch.sie_block->epoch;
                                kvm->arch.epdx = vcpu->arch.sie_block->epdx;
                        }
                        if (vcpu->arch.cputm_enabled)
                                vcpu->arch.cputm_start += *delta;
                        if (vcpu->arch.vsie_block)
                                kvm_clock_sync_scb(vcpu->arch.vsie_block,
                                                   *delta);
                }
        }
        return NOTIFY_OK;
}

static struct notifier_block kvm_clock_notifier = {
        .notifier_call = kvm_clock_sync,
};

int kvm_arch_hardware_setup(void *opaque)
{
        gmap_notifier.notifier_call = kvm_gmap_notifier;
        gmap_register_pte_notifier(&gmap_notifier);
        vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
        gmap_register_pte_notifier(&vsie_gmap_notifier);
        atomic_notifier_chain_register(&s390_epoch_delta_notifier,
                                       &kvm_clock_notifier);
        return 0;
}

void kvm_arch_hardware_unsetup(void)
{
        gmap_unregister_pte_notifier(&gmap_notifier);
        gmap_unregister_pte_notifier(&vsie_gmap_notifier);
        atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
                                         &kvm_clock_notifier);
}

static void allow_cpu_feat(unsigned long nr)
{
        set_bit_inv(nr, kvm_s390_available_cpu_feat);
}

static inline int plo_test_bit(unsigned char nr)
{
        register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
        int cc;

        asm volatile(
                /* Parameter registers are ignored for "test bit" */
                "       plo     0,0,0,0(0)\n"
                "       ipm     %0\n"
                "       srl     %0,28\n"
                : "=d" (cc)
                : "d" (r0)
                : "cc");
        return cc == 0;
}

static __always_inline void __insn32_query(unsigned int opcode, u8 *query)
{
        register unsigned long r0 asm("0") = 0; /* query function */
        register unsigned long r1 asm("1") = (unsigned long) query;

        asm volatile(
                /* Parameter regs are ignored */
                "       .insn   rrf,%[opc] << 16,2,4,6,0\n"
                :
                : "d" (r0), "a" (r1), [opc] "i" (opcode)
                : "cc", "memory");
}

#define INSN_SORTL 0xb938
#define INSN_DFLTCC 0xb939

static void kvm_s390_cpu_feat_init(void)
{
        int i;

        for (i = 0; i < 256; ++i) {
                if (plo_test_bit(i))
                        kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
        }

        if (test_facility(28)) /* TOD-clock steering */
                ptff(kvm_s390_available_subfunc.ptff,
                     sizeof(kvm_s390_available_subfunc.ptff),
                     PTFF_QAF);

        if (test_facility(17)) { /* MSA */
                __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kmac);
                __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kmc);
                __cpacf_query(CPACF_KM, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.km);
                __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kimd);
                __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.klmd);
        }
        if (test_facility(76)) /* MSA3 */
                __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.pckmo);
        if (test_facility(77)) { /* MSA4 */
                __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kmctr);
                __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kmf);
                __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kmo);
                __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.pcc);
        }
        if (test_facility(57)) /* MSA5 */
                __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.ppno);

        if (test_facility(146)) /* MSA8 */
                __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kma);

        if (test_facility(155)) /* MSA9 */
                __cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
                              kvm_s390_available_subfunc.kdsa);

        if (test_facility(150)) /* SORTL */
                __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);

        if (test_facility(151)) /* DFLTCC */
                __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);

        if (MACHINE_HAS_ESOP)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
        /*
         * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
         * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
         */
        if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
            !test_facility(3) || !nested)
                return;
        allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
        if (sclp.has_64bscao)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
        if (sclp.has_siif)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
        if (sclp.has_gpere)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
        if (sclp.has_gsls)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
        if (sclp.has_ib)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
        if (sclp.has_cei)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
        if (sclp.has_ibs)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
        if (sclp.has_kss)
                allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
        /*
         * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
         * all skey handling functions read/set the skey from the PGSTE
         * instead of the real storage key.
         *
         * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
         * pages being detected as preserved although they are resident.
         *
         * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
         * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
         *
         * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
         * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
         * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
         *
         * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
         * cannot easily shadow the SCA because of the ipte lock.
         */
}

int kvm_arch_init(void *opaque)
{
        int rc = -ENOMEM;

        kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
        if (!kvm_s390_dbf)
                return -ENOMEM;

        kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long));
        if (!kvm_s390_dbf_uv)
                goto out;

        if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) ||
            debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view))
                goto out;

        kvm_s390_cpu_feat_init();

        /* Register floating interrupt controller interface. */
        rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
        if (rc) {
                pr_err("A FLIC registration call failed with rc=%d\n", rc);
                goto out;
        }

        rc = kvm_s390_gib_init(GAL_ISC);
        if (rc)
                goto out;

        return 0;

out:
        kvm_arch_exit();
        return rc;
}

void kvm_arch_exit(void)
{
        kvm_s390_gib_destroy();
        debug_unregister(kvm_s390_dbf);
        debug_unregister(kvm_s390_dbf_uv);
}

/* Section: device related */
long kvm_arch_dev_ioctl(struct file *filp,
                        unsigned int ioctl, unsigned long arg)
{
        if (ioctl == KVM_S390_ENABLE_SIE)
                return s390_enable_sie();
        return -EINVAL;
}

int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
        int r;

        switch (ext) {
        case KVM_CAP_S390_PSW:
        case KVM_CAP_S390_GMAP:
        case KVM_CAP_SYNC_MMU:
#ifdef CONFIG_KVM_S390_UCONTROL
        case KVM_CAP_S390_UCONTROL:
#endif
        case KVM_CAP_ASYNC_PF:
        case KVM_CAP_SYNC_REGS:
        case KVM_CAP_ONE_REG:
        case KVM_CAP_ENABLE_CAP:
        case KVM_CAP_S390_CSS_SUPPORT:
        case KVM_CAP_IOEVENTFD:
        case KVM_CAP_DEVICE_CTRL:
        case KVM_CAP_S390_IRQCHIP:
        case KVM_CAP_VM_ATTRIBUTES:
        case KVM_CAP_MP_STATE:
        case KVM_CAP_IMMEDIATE_EXIT:
        case KVM_CAP_S390_INJECT_IRQ:
        case KVM_CAP_S390_USER_SIGP:
        case KVM_CAP_S390_USER_STSI:
        case KVM_CAP_S390_SKEYS:
        case KVM_CAP_S390_IRQ_STATE:
        case KVM_CAP_S390_USER_INSTR0:
        case KVM_CAP_S390_CMMA_MIGRATION:
        case KVM_CAP_S390_AIS:
        case KVM_CAP_S390_AIS_MIGRATION:
        case KVM_CAP_S390_VCPU_RESETS:
        case KVM_CAP_SET_GUEST_DEBUG:
        case KVM_CAP_S390_DIAG318:
                r = 1;
                break;
        case KVM_CAP_S390_HPAGE_1M:
                r = 0;
                if (hpage && !kvm_is_ucontrol(kvm))
                        r = 1;
                break;
        case KVM_CAP_S390_MEM_OP:
                r = MEM_OP_MAX_SIZE;
                break;
        case KVM_CAP_NR_VCPUS:
        case KVM_CAP_MAX_VCPUS:
        case KVM_CAP_MAX_VCPU_ID:
                r = KVM_S390_BSCA_CPU_SLOTS;
                if (!kvm_s390_use_sca_entries())
                        r = KVM_MAX_VCPUS;
                else if (sclp.has_esca && sclp.has_64bscao)
                        r = KVM_S390_ESCA_CPU_SLOTS;
                break;
        case KVM_CAP_S390_COW:
                r = MACHINE_HAS_ESOP;
                break;
        case KVM_CAP_S390_VECTOR_REGISTERS:
                r = MACHINE_HAS_VX;
                break;
        case KVM_CAP_S390_RI:
                r = test_facility(64);
                break;
        case KVM_CAP_S390_GS:
                r = test_facility(133);
                break;
        case KVM_CAP_S390_BPB:
                r = test_facility(82);
                break;
        case KVM_CAP_S390_PROTECTED:
                r = is_prot_virt_host();
                break;
        default:
                r = 0;
        }
        return r;
}

void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
{
        int i;
        gfn_t cur_gfn, last_gfn;
        unsigned long gaddr, vmaddr;
        struct gmap *gmap = kvm->arch.gmap;
        DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);

        /* Loop over all guest segments */
        cur_gfn = memslot->base_gfn;
        last_gfn = memslot->base_gfn + memslot->npages;
        for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
                gaddr = gfn_to_gpa(cur_gfn);
                vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
                if (kvm_is_error_hva(vmaddr))
                        continue;

                bitmap_zero(bitmap, _PAGE_ENTRIES);
                gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
                for (i = 0; i < _PAGE_ENTRIES; i++) {
                        if (test_bit(i, bitmap))
                                mark_page_dirty(kvm, cur_gfn + i);
                }

                if (fatal_signal_pending(current))
                        return;
                cond_resched();
        }
}

/* Section: vm related */
static void sca_del_vcpu(struct kvm_vcpu *vcpu);

/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                               struct kvm_dirty_log *log)
{
        int r;
        unsigned long n;
        struct kvm_memory_slot *memslot;
        int is_dirty;

        if (kvm_is_ucontrol(kvm))
                return -EINVAL;

        mutex_lock(&kvm->slots_lock);

        r = -EINVAL;
        if (log->slot >= KVM_USER_MEM_SLOTS)
                goto out;

        r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot);
        if (r)
                goto out;

        /* Clear the dirty log */
        if (is_dirty) {
                n = kvm_dirty_bitmap_bytes(memslot);
                memset(memslot->dirty_bitmap, 0, n);
        }
        r = 0;
out:
        mutex_unlock(&kvm->slots_lock);
        return r;
}

static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
{
        unsigned int i;
        struct kvm_vcpu *vcpu;

        kvm_for_each_vcpu(i, vcpu, kvm) {
                kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
        }
}

int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
{
        int r;

        if (cap->flags)
                return -EINVAL;

        switch (cap->cap) {
        case KVM_CAP_S390_IRQCHIP:
                VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
                kvm->arch.use_irqchip = 1;
                r = 0;
                break;
        case KVM_CAP_S390_USER_SIGP:
                VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
                kvm->arch.user_sigp = 1;
                r = 0;
                break;
        case KVM_CAP_S390_VECTOR_REGISTERS:
                mutex_lock(&kvm->lock);
                if (kvm->created_vcpus) {
                        r = -EBUSY;
                } else if (MACHINE_HAS_VX) {
                        set_kvm_facility(kvm->arch.model.fac_mask, 129);
                        set_kvm_facility(kvm->arch.model.fac_list, 129);
                        if (test_facility(134)) {
                                set_kvm_facility(kvm->arch.model.fac_mask, 134);
                                set_kvm_facility(kvm->arch.model.fac_list, 134);
                        }
                        if (test_facility(135)) {
                                set_kvm_facility(kvm->arch.model.fac_mask, 135);
                                set_kvm_facility(kvm->arch.model.fac_list, 135);
                        }
                        if (test_facility(148)) {
                                set_kvm_facility(kvm->arch.model.fac_mask, 148);
                                set_kvm_facility(kvm->arch.model.fac_list, 148);
                        }
                        if (test_facility(152)) {
                                set_kvm_facility(kvm->arch.model.fac_mask, 152);
                                set_kvm_facility(kvm->arch.model.fac_list, 152);
                        }
                        r = 0;
                } else
                        r = -EINVAL;
                mutex_unlock(&kvm->lock);
                VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
                         r ? "(not available)" : "(success)");
                break;
        case KVM_CAP_S390_RI:
                r = -EINVAL;
                mutex_lock(&kvm->lock);
                if (kvm->created_vcpus) {
                        r = -EBUSY;
                } else if (test_facility(64)) {
                        set_kvm_facility(kvm->arch.model.fac_mask, 64);
                        set_kvm_facility(kvm->arch.model.fac_list, 64);
                        r = 0;
                }
                mutex_unlock(&kvm->lock);
                VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
                         r ? "(not available)" : "(success)");
                break;
        case KVM_CAP_S390_AIS:
                mutex_lock(&kvm->lock);
                if (kvm->created_vcpus) {
                        r = -EBUSY;
                } else {
                        set_kvm_facility(kvm->arch.model.fac_mask, 72);
                        set_kvm_facility(kvm->arch.model.fac_list, 72);
                        r = 0;
                }
                mutex_unlock(&kvm->lock);
                VM_EVENT(kvm, 3, "ENABLE: AIS %s",
                         r ? "(not available)" : "(success)");
                break;
        case KVM_CAP_S390_GS:
                r = -EINVAL;
                mutex_lock(&kvm->lock);
                if (kvm->created_vcpus) {
                        r = -EBUSY;
                } else if (test_facility(133)) {
                        set_kvm_facility(kvm->arch.model.fac_mask, 133);
                        set_kvm_facility(kvm->arch.model.fac_list, 133);
                        r = 0;
                }
                mutex_unlock(&kvm->lock);
                VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
                         r ? "(not available)" : "(success)");
                break;
        case KVM_CAP_S390_HPAGE_1M:
                mutex_lock(&kvm->lock);
                if (kvm->created_vcpus)
                        r = -EBUSY;
                else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
                        r = -EINVAL;
                else {
                        r = 0;
                        mmap_write_lock(kvm->mm);
                        kvm->mm->context.allow_gmap_hpage_1m = 1;
                        mmap_write_unlock(kvm->mm);
                        /*
                         * We might have to create fake 4k page
                         * tables. To avoid that the hardware works on
                         * stale PGSTEs, we emulate these instructions.
                         */
                        kvm->arch.use_skf = 0;
                        kvm->arch.use_pfmfi = 0;
                }
                mutex_unlock(&kvm->lock);
                VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
                         r ? "(not available)" : "(success)");
                break;
        case KVM_CAP_S390_USER_STSI:
                VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
                kvm->arch.user_stsi = 1;
                r = 0;
                break;
        case KVM_CAP_S390_USER_INSTR0:
                VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
                kvm->arch.user_instr0 = 1;
                icpt_operexc_on_all_vcpus(kvm);
                r = 0;
                break;
        default:
                r = -EINVAL;
                break;
        }
        return r;
}

static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;

        switch (attr->attr) {
        case KVM_S390_VM_MEM_LIMIT_SIZE:
                ret = 0;
                VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
                         kvm->arch.mem_limit);
                if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
                        ret = -EFAULT;
                break;
        default:
                ret = -ENXIO;
                break;
        }
        return ret;
}

static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;
        unsigned int idx;
        switch (attr->attr) {
        case KVM_S390_VM_MEM_ENABLE_CMMA:
                ret = -ENXIO;
                if (!sclp.has_cmma)
                        break;

                VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
                mutex_lock(&kvm->lock);
                if (kvm->created_vcpus)
                        ret = -EBUSY;
                else if (kvm->mm->context.allow_gmap_hpage_1m)
                        ret = -EINVAL;
                else {
                        kvm->arch.use_cmma = 1;
                        /* Not compatible with cmma. */
                        kvm->arch.use_pfmfi = 0;
                        ret = 0;
                }
                mutex_unlock(&kvm->lock);
                break;
        case KVM_S390_VM_MEM_CLR_CMMA:
                ret = -ENXIO;
                if (!sclp.has_cmma)
                        break;
                ret = -EINVAL;
                if (!kvm->arch.use_cmma)
                        break;

                VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
                mutex_lock(&kvm->lock);
                idx = srcu_read_lock(&kvm->srcu);
                s390_reset_cmma(kvm->arch.gmap->mm);
                srcu_read_unlock(&kvm->srcu, idx);
                mutex_unlock(&kvm->lock);
                ret = 0;
                break;
        case KVM_S390_VM_MEM_LIMIT_SIZE: {
                unsigned long new_limit;

                if (kvm_is_ucontrol(kvm))
                        return -EINVAL;

                if (get_user(new_limit, (u64 __user *)attr->addr))
                        return -EFAULT;

                if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
                    new_limit > kvm->arch.mem_limit)
                        return -E2BIG;

                if (!new_limit)
                        return -EINVAL;

                /* gmap_create takes last usable address */
                if (new_limit != KVM_S390_NO_MEM_LIMIT)
                        new_limit -= 1;

                ret = -EBUSY;
                mutex_lock(&kvm->lock);
                if (!kvm->created_vcpus) {
                        /* gmap_create will round the limit up */
                        struct gmap *new = gmap_create(current->mm, new_limit);

                        if (!new) {
                                ret = -ENOMEM;
                        } else {
                                gmap_remove(kvm->arch.gmap);
                                new->private = kvm;
                                kvm->arch.gmap = new;
                                ret = 0;
                        }
                }
                mutex_unlock(&kvm->lock);
                VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
                VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
                         (void *) kvm->arch.gmap->asce);
                break;
        }
        default:
                ret = -ENXIO;
                break;
        }
        return ret;
}

static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);

void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
{
        struct kvm_vcpu *vcpu;
        int i;

        kvm_s390_vcpu_block_all(kvm);

        kvm_for_each_vcpu(i, vcpu, kvm) {
                kvm_s390_vcpu_crypto_setup(vcpu);
                /* recreate the shadow crycb by leaving the VSIE handler */
                kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
        }

        kvm_s390_vcpu_unblock_all(kvm);
}

static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
{
        mutex_lock(&kvm->lock);
        switch (attr->attr) {
        case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
                if (!test_kvm_facility(kvm, 76)) {
                        mutex_unlock(&kvm->lock);
                        return -EINVAL;
                }
                get_random_bytes(
                        kvm->arch.crypto.crycb->aes_wrapping_key_mask,
                        sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
                kvm->arch.crypto.aes_kw = 1;
                VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
                break;
        case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
                if (!test_kvm_facility(kvm, 76)) {
                        mutex_unlock(&kvm->lock);
                        return -EINVAL;
                }
                get_random_bytes(
                        kvm->arch.crypto.crycb->dea_wrapping_key_mask,
                        sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
                kvm->arch.crypto.dea_kw = 1;
                VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
                break;
        case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
                if (!test_kvm_facility(kvm, 76)) {
                        mutex_unlock(&kvm->lock);
                        return -EINVAL;
                }
                kvm->arch.crypto.aes_kw = 0;
                memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
                        sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
                VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
                break;
        case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
                if (!test_kvm_facility(kvm, 76)) {
                        mutex_unlock(&kvm->lock);
                        return -EINVAL;
                }
                kvm->arch.crypto.dea_kw = 0;
                memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
                        sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
                VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
                break;
        case KVM_S390_VM_CRYPTO_ENABLE_APIE:
                if (!ap_instructions_available()) {
                        mutex_unlock(&kvm->lock);
                        return -EOPNOTSUPP;
                }
                kvm->arch.crypto.apie = 1;
                break;
        case KVM_S390_VM_CRYPTO_DISABLE_APIE:
                if (!ap_instructions_available()) {
                        mutex_unlock(&kvm->lock);
                        return -EOPNOTSUPP;
                }
                kvm->arch.crypto.apie = 0;
                break;
        default:
                mutex_unlock(&kvm->lock);
                return -ENXIO;
        }

        kvm_s390_vcpu_crypto_reset_all(kvm);
        mutex_unlock(&kvm->lock);
        return 0;
}

static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
{
        int cx;
        struct kvm_vcpu *vcpu;

        kvm_for_each_vcpu(cx, vcpu, kvm)

                kvm_s390_sync_request(req, vcpu);
}

/*
 * Must be called with kvm->srcu held to avoid races on memslots, and with
 * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 */
static int kvm_s390_vm_start_migration(struct kvm *kvm)
{
        struct kvm_memory_slot *ms;
        struct kvm_memslots *slots;
        unsigned long ram_pages = 0;
        int slotnr;

        /* migration mode already enabled */
        if (kvm->arch.migration_mode)
                return 0;
        slots = kvm_memslots(kvm);
        if (!slots || !slots->used_slots)
                return -EINVAL;

        if (!kvm->arch.use_cmma) {
                kvm->arch.migration_mode = 1;
                return 0;
        }
        /* mark all the pages in active slots as dirty */
        for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
                ms = slots->memslots + slotnr;
                if (!ms->dirty_bitmap)
                        return -EINVAL;
                /*
                 * The second half of the bitmap is only used on x86,
                 * and would be wasted otherwise, so we put it to good
                 * use here to keep track of the state of the storage
                 * attributes.
                 */
                memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
                ram_pages += ms->npages;
        }
        atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
        kvm->arch.migration_mode = 1;
        kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
        return 0;
}

/*
 * Must be called with kvm->slots_lock to avoid races with ourselves and
 * kvm_s390_vm_start_migration.
 */
static int kvm_s390_vm_stop_migration(struct kvm *kvm)
{
        /* migration mode already disabled */
        if (!kvm->arch.migration_mode)
                return 0;
        kvm->arch.migration_mode = 0;
        if (kvm->arch.use_cmma)
                kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
        return 0;
}

static int kvm_s390_vm_set_migration(struct kvm *kvm,
                                     struct kvm_device_attr *attr)
{
        int res = -ENXIO;

        mutex_lock(&kvm->slots_lock);
        switch (attr->attr) {
        case KVM_S390_VM_MIGRATION_START:
                res = kvm_s390_vm_start_migration(kvm);
                break;
        case KVM_S390_VM_MIGRATION_STOP:
                res = kvm_s390_vm_stop_migration(kvm);
                break;
        default:
                break;
        }
        mutex_unlock(&kvm->slots_lock);

        return res;
}

static int kvm_s390_vm_get_migration(struct kvm *kvm,
                                     struct kvm_device_attr *attr)
{
        u64 mig = kvm->arch.migration_mode;

        if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
                return -ENXIO;

        if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
                return -EFAULT;
        return 0;
}

static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_tod_clock gtod;

        if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
                return -EFAULT;

        if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
                return -EINVAL;
        kvm_s390_set_tod_clock(kvm, &gtod);

        VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
                gtod.epoch_idx, gtod.tod);

        return 0;
}

static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
        u8 gtod_high;

        if (copy_from_user(&gtod_high, (void __user *)attr->addr,
                                           sizeof(gtod_high)))
                return -EFAULT;

        if (gtod_high != 0)
                return -EINVAL;
        VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);

        return 0;
}

static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_tod_clock gtod = { 0 };

        if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
                           sizeof(gtod.tod)))
                return -EFAULT;

        kvm_s390_set_tod_clock(kvm, &gtod);
        VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
        return 0;
}

static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;

        if (attr->flags)
                return -EINVAL;

        switch (attr->attr) {
        case KVM_S390_VM_TOD_EXT:
                ret = kvm_s390_set_tod_ext(kvm, attr);
                break;
        case KVM_S390_VM_TOD_HIGH:
                ret = kvm_s390_set_tod_high(kvm, attr);
                break;
        case KVM_S390_VM_TOD_LOW:
                ret = kvm_s390_set_tod_low(kvm, attr);
                break;
        default:
                ret = -ENXIO;
                break;
        }
        return ret;
}

static void kvm_s390_get_tod_clock(struct kvm *kvm,
                                   struct kvm_s390_vm_tod_clock *gtod)
{
        struct kvm_s390_tod_clock_ext htod;

        preempt_disable();

        get_tod_clock_ext((char *)&htod);

        gtod->tod = htod.tod + kvm->arch.epoch;
        gtod->epoch_idx = 0;
        if (test_kvm_facility(kvm, 139)) {
                gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
                if (gtod->tod < htod.tod)
                        gtod->epoch_idx += 1;
        }

        preempt_enable();
}

static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_tod_clock gtod;

        memset(&gtod, 0, sizeof(gtod));
        kvm_s390_get_tod_clock(kvm, &gtod);
        if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
                return -EFAULT;

        VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
                gtod.epoch_idx, gtod.tod);
        return 0;
}

static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
        u8 gtod_high = 0;

        if (copy_to_user((void __user *)attr->addr, &gtod_high,
                                         sizeof(gtod_high)))
                return -EFAULT;
        VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);

        return 0;
}

static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
        u64 gtod;

        gtod = kvm_s390_get_tod_clock_fast(kvm);
        if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
                return -EFAULT;
        VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);

        return 0;
}

static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;

        if (attr->flags)
                return -EINVAL;

        switch (attr->attr) {
        case KVM_S390_VM_TOD_EXT:
                ret = kvm_s390_get_tod_ext(kvm, attr);
                break;
        case KVM_S390_VM_TOD_HIGH:
                ret = kvm_s390_get_tod_high(kvm, attr);
                break;
        case KVM_S390_VM_TOD_LOW:
                ret = kvm_s390_get_tod_low(kvm, attr);
                break;
        default:
                ret = -ENXIO;
                break;
        }
        return ret;
}

static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_cpu_processor *proc;
        u16 lowest_ibc, unblocked_ibc;
        int ret = 0;

        mutex_lock(&kvm->lock);
        if (kvm->created_vcpus) {
                ret = -EBUSY;
                goto out;
        }
        proc = kzalloc(sizeof(*proc), GFP_KERNEL);
        if (!proc) {
                ret = -ENOMEM;
                goto out;
        }
        if (!copy_from_user(proc, (void __user *)attr->addr,
                            sizeof(*proc))) {
                kvm->arch.model.cpuid = proc->cpuid;
                lowest_ibc = sclp.ibc >> 16 & 0xfff;
                unblocked_ibc = sclp.ibc & 0xfff;
                if (lowest_ibc && proc->ibc) {
                        if (proc->ibc > unblocked_ibc)
                                kvm->arch.model.ibc = unblocked_ibc;
                        else if (proc->ibc < lowest_ibc)
                                kvm->arch.model.ibc = lowest_ibc;
                        else
                                kvm->arch.model.ibc = proc->ibc;
                }
                memcpy(kvm->arch.model.fac_list, proc->fac_list,
                       S390_ARCH_FAC_LIST_SIZE_BYTE);
                VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
                         kvm->arch.model.ibc,
                         kvm->arch.model.cpuid);
                VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
                         kvm->arch.model.fac_list[0],
                         kvm->arch.model.fac_list[1],
                         kvm->arch.model.fac_list[2]);
        } else
                ret = -EFAULT;
        kfree(proc);
out:
        mutex_unlock(&kvm->lock);
        return ret;
}

static int kvm_s390_set_processor_feat(struct kvm *kvm,
                                       struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_cpu_feat data;

        if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
                return -EFAULT;
        if (!bitmap_subset((unsigned long *) data.feat,
                           kvm_s390_available_cpu_feat,
                           KVM_S390_VM_CPU_FEAT_NR_BITS))
                return -EINVAL;

        mutex_lock(&kvm->lock);
        if (kvm->created_vcpus) {
                mutex_unlock(&kvm->lock);
                return -EBUSY;
        }
        bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
                    KVM_S390_VM_CPU_FEAT_NR_BITS);
        mutex_unlock(&kvm->lock);
        VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
                         data.feat[0],
                         data.feat[1],
                         data.feat[2]);
        return 0;
}

static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
                                          struct kvm_device_attr *attr)
{
        mutex_lock(&kvm->lock);
        if (kvm->created_vcpus) {
                mutex_unlock(&kvm->lock);
                return -EBUSY;
        }

        if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
                           sizeof(struct kvm_s390_vm_cpu_subfunc))) {
                mutex_unlock(&kvm->lock);
                return -EFAULT;
        }
        mutex_unlock(&kvm->lock);

        VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
        VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
        VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
        VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
        VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
        VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
        VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
        VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
        VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
        VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
        VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
        VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
        VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
        VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
        VM_EVENT(kvm, 3, "SET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
        VM_EVENT(kvm, 3, "SET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
        VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);

        return 0;
}

static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret = -ENXIO;

        switch (attr->attr) {
        case KVM_S390_VM_CPU_PROCESSOR:
                ret = kvm_s390_set_processor(kvm, attr);
                break;
        case KVM_S390_VM_CPU_PROCESSOR_FEAT:
                ret = kvm_s390_set_processor_feat(kvm, attr);
                break;
        case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
                ret = kvm_s390_set_processor_subfunc(kvm, attr);
                break;
        }
        return ret;
}

static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_cpu_processor *proc;
        int ret = 0;

        proc = kzalloc(sizeof(*proc), GFP_KERNEL);
        if (!proc) {
                ret = -ENOMEM;
                goto out;
        }
        proc->cpuid = kvm->arch.model.cpuid;
        proc->ibc = kvm->arch.model.ibc;
        memcpy(&proc->fac_list, kvm->arch.model.fac_list,
               S390_ARCH_FAC_LIST_SIZE_BYTE);
        VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
                 kvm->arch.model.ibc,
                 kvm->arch.model.cpuid);
        VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
                 kvm->arch.model.fac_list[0],
                 kvm->arch.model.fac_list[1],
                 kvm->arch.model.fac_list[2]);
        if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
                ret = -EFAULT;
        kfree(proc);
out:
        return ret;
}

static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_cpu_machine *mach;
        int ret = 0;

        mach = kzalloc(sizeof(*mach), GFP_KERNEL);
        if (!mach) {
                ret = -ENOMEM;
                goto out;
        }
        get_cpu_id((struct cpuid *) &mach->cpuid);
        mach->ibc = sclp.ibc;
        memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
               S390_ARCH_FAC_LIST_SIZE_BYTE);
        memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
               sizeof(S390_lowcore.stfle_fac_list));
        VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
                 kvm->arch.model.ibc,
                 kvm->arch.model.cpuid);
        VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
                 mach->fac_mask[0],
                 mach->fac_mask[1],
                 mach->fac_mask[2]);
        VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
                 mach->fac_list[0],
                 mach->fac_list[1],
                 mach->fac_list[2]);
        if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
                ret = -EFAULT;
        kfree(mach);
out:
        return ret;
}

static int kvm_s390_get_processor_feat(struct kvm *kvm,
                                       struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_cpu_feat data;

        bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
                    KVM_S390_VM_CPU_FEAT_NR_BITS);
        if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
                return -EFAULT;
        VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
                         data.feat[0],
                         data.feat[1],
                         data.feat[2]);
        return 0;
}

static int kvm_s390_get_machine_feat(struct kvm *kvm,
                                     struct kvm_device_attr *attr)
{
        struct kvm_s390_vm_cpu_feat data;

        bitmap_copy((unsigned long *) data.feat,
                    kvm_s390_available_cpu_feat,
                    KVM_S390_VM_CPU_FEAT_NR_BITS);
        if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
                return -EFAULT;
        VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
                         data.feat[0],
                         data.feat[1],
                         data.feat[2]);
        return 0;
}

static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
                                          struct kvm_device_attr *attr)
{
        if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
            sizeof(struct kvm_s390_vm_cpu_subfunc)))
                return -EFAULT;

        VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
                 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
        VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
        VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
        VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
        VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
        VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
        VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
        VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
        VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
        VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
        VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
        VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
        VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
        VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
        VM_EVENT(kvm, 3, "GET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
        VM_EVENT(kvm, 3, "GET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
                 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
        VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
                 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);

        return 0;
}

static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
                                        struct kvm_device_attr *attr)
{
        if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
            sizeof(struct kvm_s390_vm_cpu_subfunc)))
                return -EFAULT;

        VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
                 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
                 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
        VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
        VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
        VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
        VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
        VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
        VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
        VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
        VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
        VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
        VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
        VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
        VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
        VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
        VM_EVENT(kvm, 3, "GET: host  KDSA   subfunc 0x%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
        VM_EVENT(kvm, 3, "GET: host  SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
                 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
                 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
        VM_EVENT(kvm, 3, "GET: host  DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
                 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
                 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
                 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
                 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);

        return 0;
}

static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret = -ENXIO;

        switch (attr->attr) {
        case KVM_S390_VM_CPU_PROCESSOR:
                ret = kvm_s390_get_processor(kvm, attr);
                break;
        case KVM_S390_VM_CPU_MACHINE:
                ret = kvm_s390_get_machine(kvm, attr);
                break;
        case KVM_S390_VM_CPU_PROCESSOR_FEAT:
                ret = kvm_s390_get_processor_feat(kvm, attr);
                break;
        case KVM_S390_VM_CPU_MACHINE_FEAT:
                ret = kvm_s390_get_machine_feat(kvm, attr);
                break;
        case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
                ret = kvm_s390_get_processor_subfunc(kvm, attr);
                break;
        case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
                ret = kvm_s390_get_machine_subfunc(kvm, attr);
                break;
        }
        return ret;
}

static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;

        switch (attr->group) {
        case KVM_S390_VM_MEM_CTRL:
                ret = kvm_s390_set_mem_control(kvm, attr);
                break;
        case KVM_S390_VM_TOD:
                ret = kvm_s390_set_tod(kvm, attr);
                break;
        case KVM_S390_VM_CPU_MODEL:
                ret = kvm_s390_set_cpu_model(kvm, attr);
                break;
        case KVM_S390_VM_CRYPTO:
                ret = kvm_s390_vm_set_crypto(kvm, attr);
                break;
        case KVM_S390_VM_MIGRATION:
                ret = kvm_s390_vm_set_migration(kvm, attr);
                break;
        default:
                ret = -ENXIO;
                break;
        }

        return ret;
}

static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;

        switch (attr->group) {
        case KVM_S390_VM_MEM_CTRL:
                ret = kvm_s390_get_mem_control(kvm, attr);
                break;
        case KVM_S390_VM_TOD:
                ret = kvm_s390_get_tod(kvm, attr);
                break;
        case KVM_S390_VM_CPU_MODEL:
                ret = kvm_s390_get_cpu_model(kvm, attr);
                break;
        case KVM_S390_VM_MIGRATION:
                ret = kvm_s390_vm_get_migration(kvm, attr);
                break;
        default:
                ret = -ENXIO;
                break;
        }

        return ret;
}

static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
        int ret;

        switch (attr->group) {
        case KVM_S390_VM_MEM_CTRL:
                switch (attr->attr) {
                case KVM_S390_VM_MEM_ENABLE_CMMA:
                case KVM_S390_VM_MEM_CLR_CMMA:
                        ret = sclp.has_cmma ? 0 : -ENXIO;
                        break;
                case KVM_S390_VM_MEM_LIMIT_SIZE:
                        ret = 0;
                        break;
                default:
                        ret = -ENXIO;
                        break;
                }
                break;
        case KVM_S390_VM_TOD:
                switch (attr->attr) {
                case KVM_S390_VM_TOD_LOW:
                case KVM_S390_VM_TOD_HIGH:
                        ret = 0;
                        break;
                default:
                        ret = -ENXIO;
                        break;
                }
                break;
        case KVM_S390_VM_CPU_MODEL:
                switch (attr->attr) {
                case KVM_S390_VM_CPU_PROCESSOR:
                case KVM_S390_VM_CPU_MACHINE:
                case KVM_S390_VM_CPU_PROCESSOR_FEAT:
                case KVM_S390_VM_CPU_MACHINE_FEAT:
                case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
                case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
                        ret = 0;
                        break;
                default:
                        ret = -ENXIO;
                        break;
                }
                break;
        case KVM_S390_VM_CRYPTO:
                switch (attr->attr) {
                case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
                case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
                case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
                case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
                        ret = 0;
                        break;
                case KVM_S390_VM_CRYPTO_ENABLE_APIE:
                case KVM_S390_VM_CRYPTO_DISABLE_APIE:
                        ret = ap_instructions_available() ? 0 : -ENXIO;
                        break;
                default:
                        ret = -ENXIO;
                        break;
                }
                break;
        case KVM_S390_VM_MIGRATION:
                ret = 0;
                break;
        default:
                ret = -ENXIO;
                break;
        }

        return ret;
}

static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
        uint8_t *keys;
        uint64_t hva;
        int srcu_idx, i, r = 0;

        if (args->flags != 0)
                return -EINVAL;

        /* Is this guest using storage keys? */
        if (!mm_uses_skeys(current->mm))
                return KVM_S390_GET_SKEYS_NONE;

        /* Enforce sane limit on memory allocation */
        if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
                return -EINVAL;

        keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
        if (!keys)
                return -ENOMEM;

        mmap_read_lock(current->mm);
        srcu_idx = srcu_read_lock(&kvm->srcu);
        for (i = 0; i < args->count; i++) {
                hva = gfn_to_hva(kvm, args->start_gfn + i);
                if (kvm_is_error_hva(hva)) {
                        r = -EFAULT;
                        break;
                }

                r = get_guest_storage_key(current->mm, hva, &keys[i]);
                if (r)
                        break;
        }
        srcu_read_unlock(&kvm->srcu, srcu_idx);
        mmap_read_unlock(current->mm);

        if (!r) {
                r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
                                 sizeof(uint8_t) * args->count);
                if (r)
                        r = -EFAULT;
        }

        kvfree(keys);
        return r;
}

static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
        uint8_t *keys;
        uint64_t hva;
        int srcu_idx, i, r = 0;
        bool unlocked;

        if (args->flags != 0)
                return -EINVAL;

        /* Enforce sane limit on memory allocation */
        if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
                return -EINVAL;

        keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
        if (!keys)
                return -ENOMEM;

        r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
                           sizeof(uint8_t) * args->count);
        if (r) {
                r = -EFAULT;
                goto out;
        }

        /* Enable storage key handling for the guest */
        r = s390_enable_skey();
        if (r)
                goto out;

        i = 0;
        mmap_read_lock(current->mm);
        srcu_idx = srcu_read_lock(&kvm->srcu);
        while (i < args->count) {
                unlocked = false;
                hva = gfn_to_hva(kvm, args->start_gfn + i);
                if (kvm_is_error_hva(hva)) {
                        r = -EFAULT;
                        break;
                }

                /* Lowest order bit is reserved */
                if (keys[i] & 0x01) {
                        r = -EINVAL;
                        break;
                }

                r = set_guest_storage_key(current->mm, hva, keys[i], 0);
                if (r) {
                        r = fixup_user_fault(current->mm, hva,
                                             FAULT_FLAG_WRITE, &unlocked);
                        if (r)
                                break;
                }
                if (!r)
                        i++;
        }
        srcu_read_unlock(&kvm->srcu, srcu_idx);
        mmap_read_unlock(current->mm);
out:
        kvfree(keys);
        return r;
}

/*
 * Base address and length must be sent at the start of each block, therefore
 * it's cheaper to send some clean data, as long as it's less than the size of
 * two longs.
 */
#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
/* for consistency */
#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)

/*
 * Similar to gfn_to_memslot, but returns the index of a memslot also when the
 * address falls in a hole. In that case the index of one of the memslots
 * bordering the hole is returned.
 */
static int gfn_to_memslot_approx(struct kvm_memslots *slots, gfn_t gfn)
{
        int start = 0, end = slots->used_slots;
        int slot = atomic_read(&slots->lru_slot);
        struct kvm_memory_slot *memslots = slots->memslots;

        if (gfn >= memslots[slot].base_gfn &&
            gfn < memslots[slot].base_gfn + memslots[slot].npages)
                return slot;

        while (start < end) {
                slot = start + (end - start) / 2;

                if (gfn >= memslots[slot].base_gfn)
                        end = slot;
                else
                        start = slot + 1;
        }

        if (start >= slots->used_slots)
                return slots->used_slots - 1;

        if (gfn >= memslots[start].base_gfn &&
            gfn < memslots[start].base_gfn + memslots[start].npages) {
                atomic_set(&slots->lru_slot, start);
        }

        return start;
}

static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
                              u8 *res, unsigned long bufsize)
{
        unsigned long pgstev, hva, cur_gfn = args->start_gfn;

        args->count = 0;
        while (args->count < bufsize) {
                hva = gfn_to_hva(kvm, cur_gfn);
                /*
                 * We return an error if the first value was invalid, but we
                 * return successfully if at least one value was copied.
                 */
                if (kvm_is_error_hva(hva))
                        return args->count ? 0 : -EFAULT;
                if (get_pgste(kvm->mm, hva, &pgstev) < 0)
                        pgstev = 0;
                res[args->count++] = (pgstev >> 24) & 0x43;
                cur_gfn++;
        }

        return 0;
}

static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
                                              unsigned long cur_gfn)
{
        int slotidx = gfn_to_memslot_approx(slots, cur_gfn);
        struct kvm_memory_slot *ms = slots->memslots + slotidx;
        unsigned long ofs = cur_gfn - ms->base_gfn;

        if (ms->base_gfn + ms->npages <= cur_gfn) {
                slotidx--;
                /* If we are above the highest slot, wrap around */
                if (slotidx < 0)
                        slotidx = slots->used_slots - 1;

                ms = slots->memslots + slotidx;
                ofs = 0;
        }
        ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
        while ((slotidx > 0) && (ofs >= ms->npages)) {
                slotidx--;
                ms = slots->memslots + slotidx;
                ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, 0);
        }
        return ms->base_gfn + ofs;
}

static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
                             u8 *res, unsigned long bufsize)
{
        unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
        struct kvm_memslots *slots = kvm_memslots(kvm);
        struct kvm_memory_slot *ms;

        if (unlikely(!slots->used_slots))
                return 0;

        cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
        ms = gfn_to_memslot(kvm, cur_gfn);
        args->count = 0;
        args->start_gfn = cur_gfn;
        if (!ms)
                return 0;
        next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
        mem_end = slots->memslots[0].base_gfn + slots->memslots[0].npages;

        while (args->count < bufsize) {
                hva = gfn_to_hva(kvm, cur_gfn);
                if (kvm_is_error_hva(hva))
                        return 0;
                /* Decrement only if we actually flipped the bit to 0 */
                if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
                        atomic64_dec(&kvm->arch.cmma_dirty_pages);
                if (get_pgste(kvm->mm, hva, &pgstev) < 0)
                        pgstev = 0;
                /* Save the value */
                res[args->count++] = (pgstev >> 24) & 0x43;
                /* If the next bit is too far away, stop. */
                if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
                        return 0;
                /* If we reached the previous "next", find the next one */
                if (cur_gfn == next_gfn)
                        next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
                /* Reached the end of memory or of the buffer, stop */
                if ((next_gfn >= mem_end) ||
                    (next_gfn - args->start_gfn >= bufsize))
                        return 0;
                cur_gfn++;
                /* Reached the end of the current memslot, take the next one. */
                if (cur_gfn - ms->base_gfn >= ms->npages) {
                        ms = gfn_to_memslot(kvm, cur_gfn);
                        if (!ms)
                                return 0;
                }
        }
        return 0;
}

/*
 * This function searches for the next page with dirty CMMA attributes, and
 * saves the attributes in the buffer up to either the end of the buffer or
 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
 * no trailing clean bytes are saved.
 * In case no dirty bits were found, or if CMMA was not enabled or used, the
 * output buffer will indicate 0 as length.
 */
static int kvm_s390_get_cmma_bits(struct kvm *kvm,
                                  struct kvm_s390_cmma_log *args)
{
        unsigned long bufsize;
        int srcu_idx, peek, ret;
        u8 *values;

        if (!kvm->arch.use_cmma)
                return -ENXIO;
        /* Invalid/unsupported flags were specified */
        if (args->flags & ~KVM_S390_CMMA_PEEK)
                return -EINVAL;
        /* Migration mode query, and we are not doing a migration */
        peek = !!(args->flags & KVM_S390_CMMA_PEEK);
        if (!peek && !kvm->arch.migration_mode)
                return -EINVAL;
        /* CMMA is disabled or was not used, or the buffer has length zero */
        bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
        if (!bufsize || !kvm->mm->context.uses_cmm) {
                memset(args, 0, sizeof(*args));
                return 0;
        }
        /* We are not peeking, and there are no dirty pages */
        if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
                memset(args, 0, sizeof(*args));
                return 0;
        }

        values = vmalloc(bufsize);
        if (!values)
                return -ENOMEM;

        mmap_read_lock(kvm->mm);
        srcu_idx = srcu_read_lock(&kvm->srcu);
        if (peek)
                ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
        else
                ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
        srcu_read_unlock(&kvm->srcu, srcu_idx);
        mmap_read_unlock(kvm->mm);

        if (kvm->arch.migration_mode)
                args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
        else
                args->remaining = 0;

        if (copy_to_user((void __user *)args->values, values, args->count))
                ret = -EFAULT;

        vfree(values);
        return ret;
}

/*
 * This function sets the CMMA attributes for the given pages. If the input
 * buffer has zero length, no action is taken, otherwise the attributes are
 * set and the mm->context.uses_cmm flag is set.
 */
static int kvm_s390_set_cmma_bits(struct kvm *kvm,
                                  const struct kvm_s390_cmma_log *args)
{
        unsigned long hva, mask, pgstev, i;
        uint8_t *bits;
        int srcu_idx, r = 0;

        mask = args->mask;

        if (!kvm->arch.use_cmma)
                return -ENXIO;
        /* invalid/unsupported flags */
        if (args->flags != 0)
                return -EINVAL;
        /* Enforce sane limit on memory allocation */
        if (args->count > KVM_S390_CMMA_SIZE_MAX)
                return -EINVAL;
        /* Nothing to do */
        if (args->count == 0)
                return 0;

        bits = vmalloc(array_size(sizeof(*bits), args->count));
        if (!bits)
                return -ENOMEM;

        r = copy_from_user(bits, (void __user *)args->values, args->count);
        if (r) {
                r = -EFAULT;
                goto out;
        }

        mmap_read_lock(kvm->mm);
        srcu_idx = srcu_read_lock(&kvm->srcu);
        for (i = 0; i < args->count; i++) {
                hva = gfn_to_hva(kvm, args->start_gfn + i);
                if (kvm_is_error_hva(hva)) {
                        r = -EFAULT;
                        break;
                }

                pgstev = bits[i];
                pgstev = pgstev << 24;
                mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
                set_pgste_bits(kvm->mm, hva, mask, pgstev);
        }
        srcu_read_unlock(&kvm->srcu, srcu_idx);
        mmap_read_unlock(kvm->mm);

        if (!kvm->mm->context.uses_cmm) {
                mmap_write_lock(kvm->mm);
                kvm->mm->context.uses_cmm = 1;
                mmap_write_unlock(kvm->mm);
        }
out:
        vfree(bits);
        return r;
}

static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
{
        struct kvm_vcpu *vcpu;
        u16 rc, rrc;
        int ret = 0;
        int i;

        /*
         * We ignore failures and try to destroy as many CPUs as possible.
         * At the same time we must not free the assigned resources when
         * this fails, as the ultravisor has still access to that memory.
         * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak
         * behind.
         * We want to return the first failure rc and rrc, though.
         */
        kvm_for_each_vcpu(i, vcpu, kvm) {
                mutex_lock(&vcpu->mutex);
                if (kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc) && !ret) {
                        *rcp = rc;
                        *rrcp = rrc;
                        ret = -EIO;
                }
                mutex_unlock(&vcpu->mutex);
        }
        return ret;
}

static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
{
        int i, r = 0;
        u16 dummy;

        struct kvm_vcpu *vcpu;

        kvm_for_each_vcpu(i, vcpu, kvm) {
                mutex_lock(&vcpu->mutex);
                r = kvm_s390_pv_create_cpu(vcpu, rc, rrc);
                mutex_unlock(&vcpu->mutex);
                if (r)
                        break;
        }
        if (r)
                kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
        return r;
}

static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
{
        int r = 0;
        u16 dummy;
        void __user *argp = (void __user *)cmd->data;

        switch (cmd->cmd) {
        case KVM_PV_ENABLE: {
                r = -EINVAL;
                if (kvm_s390_pv_is_protected(kvm))
                        break;

                /*
                 *  FMT 4 SIE needs esca. As we never switch back to bsca from
                 *  esca, we need no cleanup in the error cases below
                 */
                r = sca_switch_to_extended(kvm);
                if (r)
                        break;

                mmap_write_lock(current->mm);
                r = gmap_mark_unmergeable();
                mmap_write_unlock(current->mm);
                if (r)
                        break;

                r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc);
                if (r)
                        break;

                r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc);
                if (r)
                        kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);

                /* we need to block service interrupts from now on */
                set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
                break;
        }
        case KVM_PV_DISABLE: {
                r = -EINVAL;
                if (!kvm_s390_pv_is_protected(kvm))
                        break;

                r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
                /*
                 * If a CPU could not be destroyed, destroy VM will also fail.
                 * There is no point in trying to destroy it. Instead return
                 * the rc and rrc from the first CPU that failed destroying.
                 */
                if (r)
                        break;
                r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc);

                /* no need to block service interrupts any more */
                clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
                break;
        }
        case KVM_PV_SET_SEC_PARMS: {
                struct kvm_s390_pv_sec_parm parms = {};
                void *hdr;

                r = -EINVAL;
                if (!kvm_s390_pv_is_protected(kvm))
                        break;

                r = -EFAULT;
                if (copy_from_user(&parms, argp, sizeof(parms)))
                        break;

                /* Currently restricted to 8KB */
                r = -EINVAL;
                if (parms.length > PAGE_SIZE * 2)
                        break;

                r = -ENOMEM;
                hdr = vmalloc(parms.length);
                if (!hdr)
                        break;

                r = -EFAULT;
                if (!copy_from_user(hdr, (void __user *)parms.origin,
                                    parms.length))
                        r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length,
                                                      &cmd->rc, &cmd->rrc);

                vfree(hdr);
                break;
        }
        case KVM_PV_UNPACK: {
                struct kvm_s390_pv_unp unp = {};

                r = -EINVAL;
                if (!kvm_s390_pv_is_protected(kvm))
                        break;

                r = -EFAULT;
                if (copy_from_user(&unp, argp, sizeof(unp)))
                        break;

                r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak,
                                       &cmd->rc, &cmd->rrc);
                break;
        }
        case KVM_PV_VERIFY: {
                r = -EINVAL;
                if (!kvm_s390_pv_is_protected(kvm))
                        break;

                r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
                                  UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc);
                KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc,
                             cmd->rrc);
                break;
        }
        case KVM_PV_PREP_RESET: {
                r = -EINVAL;
                if (!kvm_s390_pv_is_protected(kvm))
                        break;

                r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
                                  UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc);
                KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x",
                             cmd->rc, cmd->rrc);
                break;
        }
        case KVM_PV_UNSHARE_ALL: {
                r = -EINVAL;
                if (!kvm_s390_pv_is_protected(kvm))
                        break;

                r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
                                  UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc);
                KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x",
                             cmd->rc, cmd->rrc);
                break;
        }
        default:
                r = -ENOTTY;
        }
        return r;
}

long kvm_arch_vm_ioctl(struct file *filp,
                       unsigned int ioctl, unsigned long arg)
{
        struct kvm *kvm = filp->private_data;
        void __user *argp = (void __user *)arg;
        struct kvm_device_attr attr;
        int r;

        switch (ioctl) {
        case KVM_S390_INTERRUPT: {
                struct kvm_s390_interrupt s390int;

                r = -EFAULT;
                if (copy_from_user(&s390int, argp, sizeof(s390int)))
                        break;
                r = kvm_s390_inject_vm(kvm, &s390int);
                break;
        }
        case KVM_CREATE_IRQCHIP: {
                struct kvm_irq_routing_entry routing;

                r = -EINVAL;
                if (kvm->arch.use_irqchip) {
                        /* Set up dummy routing. */
                        memset(&routing, 0, sizeof(routing));
                        r = kvm_set_irq_routing(kvm, &routing, 0, 0);
                }
                break;
        }
        case KVM_SET_DEVICE_ATTR: {
                r = -EFAULT;
                if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
                        break;
                r = kvm_s390_vm_set_attr(kvm, &attr);
                break;
        }
        case KVM_GET_DEVICE_ATTR: {
                r = -EFAULT;
                if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
                        break;
                r = kvm_s390_vm_get_attr(kvm, &attr);
                break;
        }
        case KVM_HAS_DEVICE_ATTR: {
                r = -EFAULT;
                if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
                        break;
                r = kvm_s390_vm_has_attr(kvm, &attr);
                break;
        }
        case KVM_S390_GET_SKEYS: {
                struct kvm_s390_skeys args;

                r = -EFAULT;
                if (copy_from_user(&args, argp,
                                   sizeof(struct kvm_s390_skeys)))
                        break;
                r = kvm_s390_get_skeys(kvm, &args);
                break;
        }
        case KVM_S390_SET_SKEYS: {
                struct kvm_s390_skeys args;

                r = -EFAULT;
                if (copy_from_user(&args, argp,
                                   sizeof(struct kvm_s390_skeys)))
                        break;
                r = kvm_s390_set_skeys(kvm, &args);
                break;
        }
        case KVM_S390_GET_CMMA_BITS: {
                struct kvm_s390_cmma_log args;

                r = -EFAULT;
                if (copy_from_user(&args, argp, sizeof(args)))
                        break;
                mutex_lock(&kvm->slots_lock);
                r = kvm_s390_get_cmma_bits(kvm, &args);
                mutex_unlock(&kvm->slots_lock);
                if (!r) {
                        r = copy_to_user(argp, &args, sizeof(args));
                        if (r)
                                r = -EFAULT;
                }
                break;
        }
        case KVM_S390_SET_CMMA_BITS: {
                struct kvm_s390_cmma_log args;

                r = -EFAULT;
                if (copy_from_user(&args, argp, sizeof(args)))
                        break;
                mutex_lock(&kvm->slots_lock);
                r = kvm_s390_set_cmma_bits(kvm, &args);
                mutex_unlock(&kvm->slots_lock);
                break;
        }
        case KVM_S390_PV_COMMAND: {
                struct kvm_pv_cmd args;

                /* protvirt means user sigp */
                kvm->arch.user_cpu_state_ctrl = 1;
                r = 0;
                if (!is_prot_virt_host()) {
                        r = -EINVAL;
                        break;
                }
                if (copy_from_user(&args, argp, sizeof(args))) {
                        r = -EFAULT;
                        break;
                }
                if (args.flags) {
                        r = -EINVAL;
                        break;
                }
                mutex_lock(&kvm->lock);
                r = kvm_s390_handle_pv(kvm, &args);
                mutex_unlock(&kvm->lock);
                if (copy_to_user(argp, &args, sizeof(args))) {
                        r = -EFAULT;
                        break;
                }
                break;
        }
        default:
                r = -ENOTTY;
        }

        return r;
}

static int kvm_s390_apxa_installed(void)
{
        struct ap_config_info info;

        if (ap_instructions_available()) {
                if (ap_qci(&info) == 0)
                        return info.apxa;
        }

        return 0;
}

/*
 * The format of the crypto control block (CRYCB) is specified in the 3 low
 * order bits of the CRYCB designation (CRYCBD) field as follows:
 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
 *           AP extended addressing (APXA) facility are installed.
 * Format 1: The APXA facility is not installed but the MSAX3 facility is.
 * Format 2: Both the APXA and MSAX3 facilities are installed
 */
static void kvm_s390_set_crycb_format(struct kvm *kvm)
{
        kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;

        /* Clear the CRYCB format bits - i.e., set format 0 by default */
        kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);

        /* Check whether MSAX3 is installed */
        if (!test_kvm_facility(kvm, 76))
                return;

        if (kvm_s390_apxa_installed())
                kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
        else
                kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}

void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
                               unsigned long *aqm, unsigned long *adm)
{
        struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;

        mutex_lock(&kvm->lock);
        kvm_s390_vcpu_block_all(kvm);

        switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
        case CRYCB_FORMAT2: /* APCB1 use 256 bits */
                memcpy(crycb->apcb1.apm, apm, 32);
                VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
                         apm[0], apm[1], apm[2], apm[3]);
                memcpy(crycb->apcb1.aqm, aqm, 32);
                VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
                         aqm[0], aqm[1], aqm[2], aqm[3]);
                memcpy(crycb->apcb1.adm, adm, 32);
                VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
                         adm[0], adm[1], adm[2], adm[3]);
                break;
        case CRYCB_FORMAT1:
        case CRYCB_FORMAT0: /* Fall through both use APCB0 */
                memcpy(crycb->apcb0.apm, apm, 8);
                memcpy(crycb->apcb0.aqm, aqm, 2);
                memcpy(crycb->apcb0.adm, adm, 2);
                VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
                         apm[0], *((unsigned short *)aqm),
                         *((unsigned short *)adm));
                break;
        default:        /* Can not happen */
                break;
        }

        /* recreate the shadow crycb for each vcpu */
        kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
        kvm_s390_vcpu_unblock_all(kvm);
        mutex_unlock(&kvm->lock);
}
EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);

void kvm_arch_crypto_clear_masks(struct kvm *kvm)
{
        mutex_lock(&kvm->lock);
        kvm_s390_vcpu_block_all(kvm);

        memset(&kvm->arch.crypto.crycb->apcb0, 0,
               sizeof(kvm->arch.crypto.crycb->apcb0));
        memset(&kvm->arch.crypto.crycb->apcb1, 0,
               sizeof(kvm->arch.crypto.crycb->apcb1));

        VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
        /* recreate the shadow crycb for each vcpu */
        kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
        kvm_s390_vcpu_unblock_all(kvm);
        mutex_unlock(&kvm->lock);
}
EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);

static u64 kvm_s390_get_initial_cpuid(void)
{
        struct cpuid cpuid;

        get_cpu_id(&cpuid);
        cpuid.version = 0xff;
        return *((u64 *) &cpuid);
}

static void kvm_s390_crypto_init(struct kvm *kvm)
{
        kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
        kvm_s390_set_crycb_format(kvm);

        if (!test_kvm_facility(kvm, 76))
                return;

        /* Enable AES/DEA protected key functions by default */
        kvm->arch.crypto.aes_kw = 1;
        kvm->arch.crypto.dea_kw = 1;
        get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
        get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
}

static void sca_dispose(struct kvm *kvm)
{
        if (kvm->arch.use_esca)
                free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
        else
                free_page((unsigned long)(kvm->arch.sca));
        kvm->arch.sca = NULL;
}

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
        gfp_t alloc_flags = GFP_KERNEL;
        int i, rc;
        char debug_name[16];
        static unsigned long sca_offset;

        rc = -EINVAL;
#ifdef CONFIG_KVM_S390_UCONTROL
        if (type & ~KVM_VM_S390_UCONTROL)
                goto out_err;
        if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
                goto out_err;
#else
        if (type)
                goto out_err;
#endif

        rc = s390_enable_sie();
        if (rc)
                goto out_err;

        rc = -ENOMEM;

        if (!sclp.has_64bscao)
                alloc_flags |= GFP_DMA;
        rwlock_init(&kvm->arch.sca_lock);
        /* start with basic SCA */
        kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
        if (!kvm->arch.sca)
                goto out_err;
        mutex_lock(&kvm_lock);
        sca_offset += 16;
        if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
                sca_offset = 0;
        kvm->arch.sca = (struct bsca_block *)
                        ((char *) kvm->arch.sca + sca_offset);
        mutex_unlock(&kvm_lock);

        sprintf(debug_name, "kvm-%u", current->pid);

        kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
        if (!kvm->arch.dbf)
                goto out_err;

        BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
        kvm->arch.sie_page2 =
             (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
        if (!kvm->arch.sie_page2)
                goto out_err;

        kvm->arch.sie_page2->kvm = kvm;
        kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;

        for (i = 0; i < kvm_s390_fac_size(); i++) {
                kvm->arch.model.fac_mask[i] = S390_lowcore.stfle_fac_list[i] &
                                              (kvm_s390_fac_base[i] |
                                               kvm_s390_fac_ext[i]);
                kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] &
                                              kvm_s390_fac_base[i];
        }
        kvm->arch.model.subfuncs = kvm_s390_available_subfunc;

        /* we are always in czam mode - even on pre z14 machines */
        set_kvm_facility(kvm->arch.model.fac_mask, 138);
        set_kvm_facility(kvm->arch.model.fac_list, 138);
        /* we emulate STHYI in kvm */
        set_kvm_facility(kvm->arch.model.fac_mask, 74);
        set_kvm_facility(kvm->arch.model.fac_list, 74);
        if (MACHINE_HAS_TLB_GUEST) {
                set_kvm_facility(kvm->arch.model.fac_mask, 147);
                set_kvm_facility(kvm->arch.model.fac_list, 147);
        }

        if (css_general_characteristics.aiv && test_facility(65))
                set_kvm_facility(kvm->arch.model.fac_mask, 65);

        kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
        kvm->arch.model.ibc = sclp.ibc & 0x0fff;

        kvm_s390_crypto_init(kvm);

        mutex_init(&kvm->arch.float_int.ais_lock);
        spin_lock_init(&kvm->arch.float_int.lock);
        for (i = 0; i < FIRQ_LIST_COUNT; i++)
                INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
        init_waitqueue_head(&kvm->arch.ipte_wq);
        mutex_init(&kvm->arch.ipte_mutex);

        debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
        VM_EVENT(kvm, 3, "vm created with type %lu", type);

        if (type & KVM_VM_S390_UCONTROL) {
                kvm->arch.gmap = NULL;
                kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
        } else {
                if (sclp.hamax == U64_MAX)
                        kvm->arch.mem_limit = TASK_SIZE_MAX;
                else
                        kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
                                                    sclp.hamax + 1);
                kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
                if (!kvm->arch.gmap)
                        goto out_err;
                kvm->arch.gmap->private = kvm;
                kvm->arch.gmap->pfault_enabled = 0;
        }

        kvm->arch.use_pfmfi = sclp.has_pfmfi;
        kvm->arch.use_skf = sclp.has_skey;
        spin_lock_init(&kvm->arch.start_stop_lock);
        kvm_s390_vsie_init(kvm);
        if (use_gisa)
                kvm_s390_gisa_init(kvm);
        KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);

        return 0;
out_err:
        free_page((unsigned long)kvm->arch.sie_page2);
        debug_unregister(kvm->arch.dbf);
        sca_dispose(kvm);
        KVM_EVENT(3, "creation of vm failed: %d", rc);
        return rc;
}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
        u16 rc, rrc;

        VCPU_EVENT(vcpu, 3, "%s", "free cpu");
        trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
        kvm_s390_clear_local_irqs(vcpu);
        kvm_clear_async_pf_completion_queue(vcpu);
        if (!kvm_is_ucontrol(vcpu->kvm))
                sca_del_vcpu(vcpu);

        if (kvm_is_ucontrol(vcpu->kvm))
                gmap_remove(vcpu->arch.gmap);

        if (vcpu->kvm->arch.use_cmma)
                kvm_s390_vcpu_unsetup_cmma(vcpu);
        /* We can not hold the vcpu mutex here, we are already dying */
        if (kvm_s390_pv_cpu_get_handle(vcpu))
                kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc);
        free_page((unsigned long)(vcpu->arch.sie_block));
}

static void kvm_free_vcpus(struct kvm *kvm)
{
        unsigned int i;
        struct kvm_vcpu *vcpu;

        kvm_for_each_vcpu(i, vcpu, kvm)
                kvm_vcpu_destroy(vcpu);

        mutex_lock(&kvm->lock);
        for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
                kvm->vcpus[i] = NULL;

        atomic_set(&kvm->online_vcpus, 0);
        mutex_unlock(&kvm->lock);
}

void kvm_arch_destroy_vm(struct kvm *kvm)
{
        u16 rc, rrc;

        kvm_free_vcpus(kvm);
        sca_dispose(kvm);
        kvm_s390_gisa_destroy(kvm);
        /*
         * We are already at the end of life and kvm->lock is not taken.
         * This is ok as the file descriptor is closed by now and nobody
         * can mess with the pv state. To avoid lockdep_assert_held from
         * complaining we do not use kvm_s390_pv_is_protected.
         */
        if (kvm_s390_pv_get_handle(kvm))
                kvm_s390_pv_deinit_vm(kvm, &rc, &rrc);
        debug_unregister(kvm->arch.dbf);
        free_page((unsigned long)kvm->arch.sie_page2);
        if (!kvm_is_ucontrol(kvm))
                gmap_remove(kvm->arch.gmap);
        kvm_s390_destroy_adapters(kvm);
        kvm_s390_clear_float_irqs(kvm);
        kvm_s390_vsie_destroy(kvm);
        KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
}

/* Section: vcpu related */
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
        vcpu->arch.gmap = gmap_create(current->mm, -1UL);
        if (!vcpu->arch.gmap)
                return -ENOMEM;
        vcpu->arch.gmap->private = vcpu->kvm;

        return 0;
}

static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
        if (!kvm_s390_use_sca_entries())
                return;
        read_lock(&vcpu->kvm->arch.sca_lock);
        if (vcpu->kvm->arch.use_esca) {
                struct esca_block *sca = vcpu->kvm->arch.sca;

                clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
                sca->cpu[vcpu->vcpu_id].sda = 0;
        } else {
                struct bsca_block *sca = vcpu->kvm->arch.sca;

                clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
                sca->cpu[vcpu->vcpu_id].sda = 0;
        }
        read_unlock(&vcpu->kvm->arch.sca_lock);
}

static void sca_add_vcpu(struct kvm_vcpu *vcpu)
{
        if (!kvm_s390_use_sca_entries()) {
                struct bsca_block *sca = vcpu->kvm->arch.sca;

                /* we still need the basic sca for the ipte control */
                vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
                vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
                return;
        }
        read_lock(&vcpu->kvm->arch.sca_lock);
        if (vcpu->kvm->arch.use_esca) {
                struct esca_block *sca = vcpu->kvm->arch.sca;

                sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
                vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
                vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
                vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
                set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
        } else {
                struct bsca_block *sca = vcpu->kvm->arch.sca;

                sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
                vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
                vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
                set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
        }
        read_unlock(&vcpu->kvm->arch.sca_lock);
}

/* Basic SCA to Extended SCA data copy routines */
static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
{
        d->sda = s->sda;
        d->sigp_ctrl.c = s->sigp_ctrl.c;
        d->sigp_ctrl.scn = s->sigp_ctrl.scn;
}

static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
{
        int i;

        d->ipte_control = s->ipte_control;
        d->mcn[0] = s->mcn;
        for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
                sca_copy_entry(&d->cpu[i], &s->cpu[i]);
}

static int sca_switch_to_extended(struct kvm *kvm)
{
        struct bsca_block *old_sca = kvm->arch.sca;
        struct esca_block *new_sca;
        struct kvm_vcpu *vcpu;
        unsigned int vcpu_idx;
        u32 scaol, scaoh;

        if (kvm->arch.use_esca)
                return 0;

        new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
        if (!new_sca)
                return -ENOMEM;

        scaoh = (u32)((u64)(new_sca) >> 32);
        scaol = (u32)(u64)(new_sca) & ~0x3fU;

        kvm_s390_vcpu_block_all(kvm);
        write_lock(&kvm->arch.sca_lock);

        sca_copy_b_to_e(new_sca, old_sca);

        kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
                vcpu->arch.sie_block->scaoh = scaoh;
                vcpu->arch.sie_block->scaol = scaol;
                vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
        }
        kvm->arch.sca = new_sca;
        kvm->arch.use_esca = 1;

        write_unlock(&kvm->arch.sca_lock);
        kvm_s390_vcpu_unblock_all(kvm);

        free_page((unsigned long)old_sca);

        VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
                 old_sca, kvm->arch.sca);
        return 0;
}

static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
{
        int rc;

        if (!kvm_s390_use_sca_entries()) {
                if (id < KVM_MAX_VCPUS)
                        return true;
                return false;
        }
        if (id < KVM_S390_BSCA_CPU_SLOTS)
                return true;
        if (!sclp.has_esca || !sclp.has_64bscao)
                return false;

        mutex_lock(&kvm->lock);
        rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
        mutex_unlock(&kvm->lock);

        return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
        WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
        raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
        vcpu->arch.cputm_start = get_tod_clock_fast();
        raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
        WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
        raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
        vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
        vcpu->arch.cputm_start = 0;
        raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
        WARN_ON_ONCE(vcpu->arch.cputm_enabled);
        vcpu->arch.cputm_enabled = true;
        __start_cpu_timer_accounting(vcpu);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
        WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
        __stop_cpu_timer_accounting(vcpu);
        vcpu->arch.cputm_enabled = false;
}

static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
        preempt_disable(); /* protect from TOD sync and vcpu_load/put */
        __enable_cpu_timer_accounting(vcpu);
        preempt_enable();
}

static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
        preempt_disable(); /* protect from TOD sync and vcpu_load/put */
        __disable_cpu_timer_accounting(vcpu);
        preempt_enable();