qemu

kvm.c (76978B)

---

 /*
  * QEMU S390x KVM implementation
  *
  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
  * Copyright IBM Corp. 2012
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "qemu/osdep.h"
 #include <sys/ioctl.h>
 
 #include <linux/kvm.h>
 #include <asm/ptrace.h>
 
 #include "cpu.h"
 #include "s390x-internal.h"
 #include "kvm_s390x.h"
 #include "sysemu/kvm_int.h"
 #include "qemu/cutils.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "qemu/timer.h"
 #include "qemu/units.h"
 #include "qemu/main-loop.h"
 #include "qemu/mmap-alloc.h"
 #include "qemu/log.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/hw_accel.h"
 #include "sysemu/runstate.h"
 #include "sysemu/device_tree.h"
 #include "exec/gdbstub.h"
 #include "exec/ram_addr.h"
 #include "trace.h"
 #include "hw/s390x/s390-pci-inst.h"
 #include "hw/s390x/s390-pci-bus.h"
 #include "hw/s390x/ipl.h"
 #include "hw/s390x/ebcdic.h"
 #include "exec/memattrs.h"
 #include "hw/s390x/s390-virtio-ccw.h"
 #include "hw/s390x/s390-virtio-hcall.h"
 #include "hw/s390x/pv.h"
 
 #ifndef DEBUG_KVM
 #define DEBUG_KVM  0
 #endif
 
 #define DPRINTF(fmt, ...) do {                \
     if (DEBUG_KVM) {                          \
         fprintf(stderr, fmt, ## __VA_ARGS__); \
     }                                         \
 } while (0)
 
 #define kvm_vm_check_mem_attr(s, attr) \
     kvm_vm_check_attr(s, KVM_S390_VM_MEM_CTRL, attr)
 
 #define IPA0_DIAG                       0x8300
 #define IPA0_SIGP                       0xae00
 #define IPA0_B2                         0xb200
 #define IPA0_B9                         0xb900
 #define IPA0_EB                         0xeb00
 #define IPA0_E3                         0xe300
 
 #define PRIV_B2_SCLP_CALL               0x20
 #define PRIV_B2_CSCH                    0x30
 #define PRIV_B2_HSCH                    0x31
 #define PRIV_B2_MSCH                    0x32
 #define PRIV_B2_SSCH                    0x33
 #define PRIV_B2_STSCH                   0x34
 #define PRIV_B2_TSCH                    0x35
 #define PRIV_B2_TPI                     0x36
 #define PRIV_B2_SAL                     0x37
 #define PRIV_B2_RSCH                    0x38
 #define PRIV_B2_STCRW                   0x39
 #define PRIV_B2_STCPS                   0x3a
 #define PRIV_B2_RCHP                    0x3b
 #define PRIV_B2_SCHM                    0x3c
 #define PRIV_B2_CHSC                    0x5f
 #define PRIV_B2_SIGA                    0x74
 #define PRIV_B2_XSCH                    0x76
 
 #define PRIV_EB_SQBS                    0x8a
 #define PRIV_EB_PCISTB                  0xd0
 #define PRIV_EB_SIC                     0xd1
 
 #define PRIV_B9_EQBS                    0x9c
 #define PRIV_B9_CLP                     0xa0
 #define PRIV_B9_PCISTG                  0xd0
 #define PRIV_B9_PCILG                   0xd2
 #define PRIV_B9_RPCIT                   0xd3
 
 #define PRIV_E3_MPCIFC                  0xd0
 #define PRIV_E3_STPCIFC                 0xd4
 
 #define DIAG_TIMEREVENT                 0x288
 #define DIAG_IPL                        0x308
 #define DIAG_SET_CONTROL_PROGRAM_CODES  0x318
 #define DIAG_KVM_HYPERCALL              0x500
 #define DIAG_KVM_BREAKPOINT             0x501
 
 #define ICPT_INSTRUCTION                0x04
 #define ICPT_PROGRAM                    0x08
 #define ICPT_EXT_INT                    0x14
 #define ICPT_WAITPSW                    0x1c
 #define ICPT_SOFT_INTERCEPT             0x24
 #define ICPT_CPU_STOP                   0x28
 #define ICPT_OPEREXC                    0x2c
 #define ICPT_IO                         0x40
 #define ICPT_PV_INSTR                   0x68
 #define ICPT_PV_INSTR_NOTIFICATION      0x6c
 
 #define NR_LOCAL_IRQS 32
 /*
  * Needs to be big enough to contain max_cpus emergency signals
  * and in addition NR_LOCAL_IRQS interrupts
  */
 #define VCPU_IRQ_BUF_SIZE(max_cpus) (sizeof(struct kvm_s390_irq) * \
                                      (max_cpus + NR_LOCAL_IRQS))
 /*
  * KVM does only support memory slots up to KVM_MEM_MAX_NR_PAGES pages
  * as the dirty bitmap must be managed by bitops that take an int as
  * position indicator. This would end at an unaligned  address
  * (0x7fffff00000). As future variants might provide larger pages
  * and to make all addresses properly aligned, let us split at 4TB.
  */
 #define KVM_SLOT_MAX_BYTES (4UL * TiB)
 
 static CPUWatchpoint hw_watchpoint;
 /*
  * We don't use a list because this structure is also used to transmit the
  * hardware breakpoints to the kernel.
  */
 static struct kvm_hw_breakpoint *hw_breakpoints;
 static int nb_hw_breakpoints;
 
 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO
 };
 
 static int cap_sync_regs;
 static int cap_async_pf;
 static int cap_mem_op;
 static int cap_mem_op_extension;
 static int cap_s390_irq;
 static int cap_ri;
 static int cap_hpage_1m;
 static int cap_vcpu_resets;
 static int cap_protected;
 static int cap_zpci_op;
 static int cap_protected_dump;
 
 static bool mem_op_storage_key_support;
 
 static int active_cmma;
 
 static int kvm_s390_query_mem_limit(uint64_t *memory_limit)
 {
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_MEM_CTRL,
         .attr = KVM_S390_VM_MEM_LIMIT_SIZE,
         .addr = (uint64_t) memory_limit,
     };
 
     return kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
 }
 
 int kvm_s390_set_mem_limit(uint64_t new_limit, uint64_t *hw_limit)
 {
     int rc;
 
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_MEM_CTRL,
         .attr = KVM_S390_VM_MEM_LIMIT_SIZE,
         .addr = (uint64_t) &new_limit,
     };
 
     if (!kvm_vm_check_mem_attr(kvm_state, KVM_S390_VM_MEM_LIMIT_SIZE)) {
         return 0;
     }
 
     rc = kvm_s390_query_mem_limit(hw_limit);
     if (rc) {
         return rc;
     } else if (*hw_limit < new_limit) {
         return -E2BIG;
     }
 
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
 int kvm_s390_cmma_active(void)
 {
     return active_cmma;
 }
 
 static bool kvm_s390_cmma_available(void)
 {
     static bool initialized, value;
 
     if (!initialized) {
         initialized = true;
         value = kvm_vm_check_mem_attr(kvm_state, KVM_S390_VM_MEM_ENABLE_CMMA) &&
                 kvm_vm_check_mem_attr(kvm_state, KVM_S390_VM_MEM_CLR_CMMA);
     }
     return value;
 }
 
 void kvm_s390_cmma_reset(void)
 {
     int rc;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_MEM_CTRL,
         .attr = KVM_S390_VM_MEM_CLR_CMMA,
     };
 
     if (!kvm_s390_cmma_active()) {
         return;
     }
 
     rc = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
     trace_kvm_clear_cmma(rc);
 }
 
 static void kvm_s390_enable_cmma(void)
 {
     int rc;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_MEM_CTRL,
         .attr = KVM_S390_VM_MEM_ENABLE_CMMA,
     };
 
     if (cap_hpage_1m) {
         warn_report("CMM will not be enabled because it is not "
                     "compatible with huge memory backings.");
         return;
     }
     rc = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
     active_cmma = !rc;
     trace_kvm_enable_cmma(rc);
 }
 
 static void kvm_s390_set_attr(uint64_t attr)
 {
     struct kvm_device_attr attribute = {
         .group = KVM_S390_VM_CRYPTO,
         .attr  = attr,
     };
 
     int ret = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attribute);
 
     if (ret) {
         error_report("Failed to set crypto device attribute %lu: %s",
                      attr, strerror(-ret));
     }
 }
 
 static void kvm_s390_init_aes_kw(void)
 {
     uint64_t attr = KVM_S390_VM_CRYPTO_DISABLE_AES_KW;
 
     if (object_property_get_bool(OBJECT(qdev_get_machine()), "aes-key-wrap",
                                  NULL)) {
             attr = KVM_S390_VM_CRYPTO_ENABLE_AES_KW;
     }
 
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
             kvm_s390_set_attr(attr);
     }
 }
 
 static void kvm_s390_init_dea_kw(void)
 {
     uint64_t attr = KVM_S390_VM_CRYPTO_DISABLE_DEA_KW;
 
     if (object_property_get_bool(OBJECT(qdev_get_machine()), "dea-key-wrap",
                                  NULL)) {
             attr = KVM_S390_VM_CRYPTO_ENABLE_DEA_KW;
     }
 
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
             kvm_s390_set_attr(attr);
     }
 }
 
 void kvm_s390_crypto_reset(void)
 {
     if (s390_has_feat(S390_FEAT_MSA_EXT_3)) {
         kvm_s390_init_aes_kw();
         kvm_s390_init_dea_kw();
     }
 }
 
 void kvm_s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 {
     if (pagesize == 4 * KiB) {
         return;
     }
 
     if (!hpage_1m_allowed()) {
         error_setg(errp, "This QEMU machine does not support huge page "
                    "mappings");
         return;
     }
 
     if (pagesize != 1 * MiB) {
         error_setg(errp, "Memory backing with 2G pages was specified, "
                    "but KVM does not support this memory backing");
         return;
     }
 
     if (kvm_vm_enable_cap(kvm_state, KVM_CAP_S390_HPAGE_1M, 0)) {
         error_setg(errp, "Memory backing with 1M pages was specified, "
                    "but KVM does not support this memory backing");
         return;
     }
 
     cap_hpage_1m = 1;
 }
 
 int kvm_s390_get_hpage_1m(void)
 {
     return cap_hpage_1m;
 }
 
 static void ccw_machine_class_foreach(ObjectClass *oc, void *opaque)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
 
     mc->default_cpu_type = S390_CPU_TYPE_NAME("host");
 }
 
 int kvm_arch_init(MachineState *ms, KVMState *s)
 {
     object_class_foreach(ccw_machine_class_foreach, TYPE_S390_CCW_MACHINE,
                          false, NULL);
 
     if (!kvm_check_extension(kvm_state, KVM_CAP_DEVICE_CTRL)) {
         error_report("KVM is missing capability KVM_CAP_DEVICE_CTRL - "
                      "please use kernel 3.15 or newer");
         return -1;
     }
     if (!kvm_check_extension(s, KVM_CAP_S390_COW)) {
         error_report("KVM is missing capability KVM_CAP_S390_COW - "
                      "unsupported environment");
         return -1;
     }
 
     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
     cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
     cap_mem_op = kvm_check_extension(s, KVM_CAP_S390_MEM_OP);
     cap_mem_op_extension = kvm_check_extension(s, KVM_CAP_S390_MEM_OP_EXTENSION);
     mem_op_storage_key_support = cap_mem_op_extension > 0;
     cap_s390_irq = kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ);
     cap_vcpu_resets = kvm_check_extension(s, KVM_CAP_S390_VCPU_RESETS);
     cap_protected = kvm_check_extension(s, KVM_CAP_S390_PROTECTED);
     cap_zpci_op = kvm_check_extension(s, KVM_CAP_S390_ZPCI_OP);
     cap_protected_dump = kvm_check_extension(s, KVM_CAP_S390_PROTECTED_DUMP);
 
     kvm_vm_enable_cap(s, KVM_CAP_S390_USER_SIGP, 0);
     kvm_vm_enable_cap(s, KVM_CAP_S390_VECTOR_REGISTERS, 0);
     kvm_vm_enable_cap(s, KVM_CAP_S390_USER_STSI, 0);
     if (ri_allowed()) {
         if (kvm_vm_enable_cap(s, KVM_CAP_S390_RI, 0) == 0) {
             cap_ri = 1;
         }
     }
     if (cpu_model_allowed()) {
         kvm_vm_enable_cap(s, KVM_CAP_S390_GS, 0);
     }
 
     /*
      * The migration interface for ais was introduced with kernel 4.13
      * but the capability itself had been active since 4.12. As migration
      * support is considered necessary, we only try to enable this for
      * newer machine types if KVM_CAP_S390_AIS_MIGRATION is available.
      */
     if (cpu_model_allowed() && kvm_kernel_irqchip_allowed() &&
         kvm_check_extension(s, KVM_CAP_S390_AIS_MIGRATION)) {
         kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0);
     }
 
     kvm_set_max_memslot_size(KVM_SLOT_MAX_BYTES);
     return 0;
 }
 
 int kvm_arch_irqchip_create(KVMState *s)
 {
     return 0;
 }
 
 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 {
     return cpu->cpu_index;
 }
 
 int kvm_arch_init_vcpu(CPUState *cs)
 {
     unsigned int max_cpus = MACHINE(qdev_get_machine())->smp.max_cpus;
     S390CPU *cpu = S390_CPU(cs);
     kvm_s390_set_cpu_state(cpu, cpu->env.cpu_state);
     cpu->irqstate = g_malloc0(VCPU_IRQ_BUF_SIZE(max_cpus));
     return 0;
 }
 
 int kvm_arch_destroy_vcpu(CPUState *cs)
 {
     S390CPU *cpu = S390_CPU(cs);
 
     g_free(cpu->irqstate);
     cpu->irqstate = NULL;
 
     return 0;
 }
 
 static void kvm_s390_reset_vcpu(S390CPU *cpu, unsigned long type)
 {
     CPUState *cs = CPU(cpu);
 
     /*
      * The reset call is needed here to reset in-kernel vcpu data that
      * we can't access directly from QEMU (i.e. with older kernels
      * which don't support sync_regs/ONE_REG).  Before this ioctl
      * cpu_synchronize_state() is called in common kvm code
      * (kvm-all).
      */
     if (kvm_vcpu_ioctl(cs, type)) {
         error_report("CPU reset failed on CPU %i type %lx",
                      cs->cpu_index, type);
     }
 }
 
 void kvm_s390_reset_vcpu_initial(S390CPU *cpu)
 {
     kvm_s390_reset_vcpu(cpu, KVM_S390_INITIAL_RESET);
 }
 
 void kvm_s390_reset_vcpu_clear(S390CPU *cpu)
 {
     if (cap_vcpu_resets) {
         kvm_s390_reset_vcpu(cpu, KVM_S390_CLEAR_RESET);
     } else {
         kvm_s390_reset_vcpu(cpu, KVM_S390_INITIAL_RESET);
     }
 }
 
 void kvm_s390_reset_vcpu_normal(S390CPU *cpu)
 {
     if (cap_vcpu_resets) {
         kvm_s390_reset_vcpu(cpu, KVM_S390_NORMAL_RESET);
     }
 }
 
 static int can_sync_regs(CPUState *cs, int regs)
 {
     return cap_sync_regs && (cs->kvm_run->kvm_valid_regs & regs) == regs;
 }
 
 int kvm_arch_put_registers(CPUState *cs, int level)
 {
     S390CPU *cpu = S390_CPU(cs);
     CPUS390XState *env = &cpu->env;
     struct kvm_sregs sregs;
     struct kvm_regs regs;
     struct kvm_fpu fpu = {};
     int r;
     int i;
 
     /* always save the PSW  and the GPRS*/
     cs->kvm_run->psw_addr = env->psw.addr;
     cs->kvm_run->psw_mask = env->psw.mask;
 
     if (can_sync_regs(cs, KVM_SYNC_GPRS)) {
         for (i = 0; i < 16; i++) {
             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
         }
     } else {
         for (i = 0; i < 16; i++) {
             regs.gprs[i] = env->regs[i];
         }
         r = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
         if (r < 0) {
             return r;
         }
     }
 
     if (can_sync_regs(cs, KVM_SYNC_VRS)) {
         for (i = 0; i < 32; i++) {
             cs->kvm_run->s.regs.vrs[i][0] = env->vregs[i][0];
             cs->kvm_run->s.regs.vrs[i][1] = env->vregs[i][1];
         }
         cs->kvm_run->s.regs.fpc = env->fpc;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_VRS;
     } else if (can_sync_regs(cs, KVM_SYNC_FPRS)) {
         for (i = 0; i < 16; i++) {
             cs->kvm_run->s.regs.fprs[i] = *get_freg(env, i);
         }
         cs->kvm_run->s.regs.fpc = env->fpc;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_FPRS;
     } else {
         /* Floating point */
         for (i = 0; i < 16; i++) {
             fpu.fprs[i] = *get_freg(env, i);
         }
         fpu.fpc = env->fpc;
 
         r = kvm_vcpu_ioctl(cs, KVM_SET_FPU, &fpu);
         if (r < 0) {
             return r;
         }
     }
 
     /* Do we need to save more than that? */
     if (level == KVM_PUT_RUNTIME_STATE) {
         return 0;
     }
 
     if (can_sync_regs(cs, KVM_SYNC_ARCH0)) {
         cs->kvm_run->s.regs.cputm = env->cputm;
         cs->kvm_run->s.regs.ckc = env->ckc;
         cs->kvm_run->s.regs.todpr = env->todpr;
         cs->kvm_run->s.regs.gbea = env->gbea;
         cs->kvm_run->s.regs.pp = env->pp;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ARCH0;
     } else {
         /*
          * These ONE_REGS are not protected by a capability. As they are only
          * necessary for migration we just trace a possible error, but don't
          * return with an error return code.
          */
         kvm_set_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
         kvm_set_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
         kvm_set_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
         kvm_set_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
         kvm_set_one_reg(cs, KVM_REG_S390_PP, &env->pp);
     }
 
     if (can_sync_regs(cs, KVM_SYNC_RICCB)) {
         memcpy(cs->kvm_run->s.regs.riccb, env->riccb, 64);
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_RICCB;
     }
 
     /* pfault parameters */
     if (can_sync_regs(cs, KVM_SYNC_PFAULT)) {
         cs->kvm_run->s.regs.pft = env->pfault_token;
         cs->kvm_run->s.regs.pfs = env->pfault_select;
         cs->kvm_run->s.regs.pfc = env->pfault_compare;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PFAULT;
     } else if (cap_async_pf) {
         r = kvm_set_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token);
         if (r < 0) {
             return r;
         }
         r = kvm_set_one_reg(cs, KVM_REG_S390_PFCOMPARE, &env->pfault_compare);
         if (r < 0) {
             return r;
         }
         r = kvm_set_one_reg(cs, KVM_REG_S390_PFSELECT, &env->pfault_select);
         if (r < 0) {
             return r;
         }
     }
 
     /* access registers and control registers*/
     if (can_sync_regs(cs, KVM_SYNC_ACRS | KVM_SYNC_CRS)) {
         for (i = 0; i < 16; i++) {
             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
         }
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
     } else {
         for (i = 0; i < 16; i++) {
             sregs.acrs[i] = env->aregs[i];
             sregs.crs[i] = env->cregs[i];
         }
         r = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
         if (r < 0) {
             return r;
         }
     }
 
     if (can_sync_regs(cs, KVM_SYNC_GSCB)) {
         memcpy(cs->kvm_run->s.regs.gscb, env->gscb, 32);
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GSCB;
     }
 
     if (can_sync_regs(cs, KVM_SYNC_BPBC)) {
         cs->kvm_run->s.regs.bpbc = env->bpbc;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_BPBC;
     }
 
     if (can_sync_regs(cs, KVM_SYNC_ETOKEN)) {
         cs->kvm_run->s.regs.etoken = env->etoken;
         cs->kvm_run->s.regs.etoken_extension  = env->etoken_extension;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ETOKEN;
     }
 
     if (can_sync_regs(cs, KVM_SYNC_DIAG318)) {
         cs->kvm_run->s.regs.diag318 = env->diag318_info;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
     }
 
     /* Finally the prefix */
     if (can_sync_regs(cs, KVM_SYNC_PREFIX)) {
         cs->kvm_run->s.regs.prefix = env->psa;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
     } else {
         /* prefix is only supported via sync regs */
     }
     return 0;
 }
 
 int kvm_arch_get_registers(CPUState *cs)
 {
     S390CPU *cpu = S390_CPU(cs);
     CPUS390XState *env = &cpu->env;
     struct kvm_sregs sregs;
     struct kvm_regs regs;
     struct kvm_fpu fpu;
     int i, r;
 
     /* get the PSW */
     env->psw.addr = cs->kvm_run->psw_addr;
     env->psw.mask = cs->kvm_run->psw_mask;
 
     /* the GPRS */
     if (can_sync_regs(cs, KVM_SYNC_GPRS)) {
         for (i = 0; i < 16; i++) {
             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
         }
     } else {
         r = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
         if (r < 0) {
             return r;
         }
          for (i = 0; i < 16; i++) {
             env->regs[i] = regs.gprs[i];
         }
     }
 
     /* The ACRS and CRS */
     if (can_sync_regs(cs, KVM_SYNC_ACRS | KVM_SYNC_CRS)) {
         for (i = 0; i < 16; i++) {
             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
         }
     } else {
         r = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
         if (r < 0) {
             return r;
         }
          for (i = 0; i < 16; i++) {
             env->aregs[i] = sregs.acrs[i];
             env->cregs[i] = sregs.crs[i];
         }
     }
 
     /* Floating point and vector registers */
     if (can_sync_regs(cs, KVM_SYNC_VRS)) {
         for (i = 0; i < 32; i++) {
             env->vregs[i][0] = cs->kvm_run->s.regs.vrs[i][0];
             env->vregs[i][1] = cs->kvm_run->s.regs.vrs[i][1];
         }
         env->fpc = cs->kvm_run->s.regs.fpc;
     } else if (can_sync_regs(cs, KVM_SYNC_FPRS)) {
         for (i = 0; i < 16; i++) {
             *get_freg(env, i) = cs->kvm_run->s.regs.fprs[i];
         }
         env->fpc = cs->kvm_run->s.regs.fpc;
     } else {
         r = kvm_vcpu_ioctl(cs, KVM_GET_FPU, &fpu);
         if (r < 0) {
             return r;
         }
         for (i = 0; i < 16; i++) {
             *get_freg(env, i) = fpu.fprs[i];
         }
         env->fpc = fpu.fpc;
     }
 
     /* The prefix */
     if (can_sync_regs(cs, KVM_SYNC_PREFIX)) {
         env->psa = cs->kvm_run->s.regs.prefix;
     }
 
     if (can_sync_regs(cs, KVM_SYNC_ARCH0)) {
         env->cputm = cs->kvm_run->s.regs.cputm;
         env->ckc = cs->kvm_run->s.regs.ckc;
         env->todpr = cs->kvm_run->s.regs.todpr;
         env->gbea = cs->kvm_run->s.regs.gbea;
         env->pp = cs->kvm_run->s.regs.pp;
     } else {
         /*
          * These ONE_REGS are not protected by a capability. As they are only
          * necessary for migration we just trace a possible error, but don't
          * return with an error return code.
          */
         kvm_get_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
         kvm_get_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
         kvm_get_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
         kvm_get_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
         kvm_get_one_reg(cs, KVM_REG_S390_PP, &env->pp);
     }
 
     if (can_sync_regs(cs, KVM_SYNC_RICCB)) {
         memcpy(env->riccb, cs->kvm_run->s.regs.riccb, 64);
     }
 
     if (can_sync_regs(cs, KVM_SYNC_GSCB)) {
         memcpy(env->gscb, cs->kvm_run->s.regs.gscb, 32);
     }
 
     if (can_sync_regs(cs, KVM_SYNC_BPBC)) {
         env->bpbc = cs->kvm_run->s.regs.bpbc;
     }
 
     if (can_sync_regs(cs, KVM_SYNC_ETOKEN)) {
         env->etoken = cs->kvm_run->s.regs.etoken;
         env->etoken_extension = cs->kvm_run->s.regs.etoken_extension;
     }
 
     /* pfault parameters */
     if (can_sync_regs(cs, KVM_SYNC_PFAULT)) {
         env->pfault_token = cs->kvm_run->s.regs.pft;
         env->pfault_select = cs->kvm_run->s.regs.pfs;
         env->pfault_compare = cs->kvm_run->s.regs.pfc;
     } else if (cap_async_pf) {
         r = kvm_get_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token);
         if (r < 0) {
             return r;
         }
         r = kvm_get_one_reg(cs, KVM_REG_S390_PFCOMPARE, &env->pfault_compare);
         if (r < 0) {
             return r;
         }
         r = kvm_get_one_reg(cs, KVM_REG_S390_PFSELECT, &env->pfault_select);
         if (r < 0) {
             return r;
         }
     }
 
     if (can_sync_regs(cs, KVM_SYNC_DIAG318)) {
         env->diag318_info = cs->kvm_run->s.regs.diag318;
     }
 
     return 0;
 }
 
 int kvm_s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 {
     int r;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_TOD,
         .attr = KVM_S390_VM_TOD_LOW,
         .addr = (uint64_t)tod_low,
     };
 
     r = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
     if (r) {
         return r;
     }
 
     attr.attr = KVM_S390_VM_TOD_HIGH;
     attr.addr = (uint64_t)tod_high;
     return kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
 }
 
 int kvm_s390_get_clock_ext(uint8_t *tod_high, uint64_t *tod_low)
 {
     int r;
     struct kvm_s390_vm_tod_clock gtod;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_TOD,
         .attr = KVM_S390_VM_TOD_EXT,
         .addr = (uint64_t)&gtod,
     };
 
     r = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
     *tod_high = gtod.epoch_idx;
     *tod_low  = gtod.tod;
 
     return r;
 }
 
 int kvm_s390_set_clock(uint8_t tod_high, uint64_t tod_low)
 {
     int r;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_TOD,
         .attr = KVM_S390_VM_TOD_LOW,
         .addr = (uint64_t)&tod_low,
     };
 
     r = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
     if (r) {
         return r;
     }
 
     attr.attr = KVM_S390_VM_TOD_HIGH;
     attr.addr = (uint64_t)&tod_high;
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
 int kvm_s390_set_clock_ext(uint8_t tod_high, uint64_t tod_low)
 {
     struct kvm_s390_vm_tod_clock gtod = {
         .epoch_idx = tod_high,
         .tod  = tod_low,
     };
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_TOD,
         .attr = KVM_S390_VM_TOD_EXT,
         .addr = (uint64_t)&gtod,
     };
 
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
 /**
  * kvm_s390_mem_op:
  * @addr:      the logical start address in guest memory
  * @ar:        the access register number
  * @hostbuf:   buffer in host memory. NULL = do only checks w/o copying
  * @len:       length that should be transferred
  * @is_write:  true = write, false = read
  * Returns:    0 on success, non-zero if an exception or error occurred
  *
  * Use KVM ioctl to read/write from/to guest memory. An access exception
  * is injected into the vCPU in case of translation errors.
  */
 int kvm_s390_mem_op(S390CPU *cpu, vaddr addr, uint8_t ar, void *hostbuf,
                     int len, bool is_write)
 {
     struct kvm_s390_mem_op mem_op = {
         .gaddr = addr,
         .flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION,
         .size = len,
         .op = is_write ? KVM_S390_MEMOP_LOGICAL_WRITE
                        : KVM_S390_MEMOP_LOGICAL_READ,
         .buf = (uint64_t)hostbuf,
         .ar = ar,
         .key = (cpu->env.psw.mask & PSW_MASK_KEY) >> PSW_SHIFT_KEY,
     };
     int ret;
 
     if (!cap_mem_op) {
         return -ENOSYS;
     }
     if (!hostbuf) {
         mem_op.flags |= KVM_S390_MEMOP_F_CHECK_ONLY;
     }
     if (mem_op_storage_key_support) {
         mem_op.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION;
     }
 
     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_S390_MEM_OP, &mem_op);
     if (ret < 0) {
         warn_report("KVM_S390_MEM_OP failed: %s", strerror(-ret));
     }
     return ret;
 }
 
 int kvm_s390_mem_op_pv(S390CPU *cpu, uint64_t offset, void *hostbuf,
                        int len, bool is_write)
 {
     struct kvm_s390_mem_op mem_op = {
         .sida_offset = offset,
         .size = len,
         .op = is_write ? KVM_S390_MEMOP_SIDA_WRITE
                        : KVM_S390_MEMOP_SIDA_READ,
         .buf = (uint64_t)hostbuf,
     };
     int ret;
 
     if (!cap_mem_op || !cap_protected) {
         return -ENOSYS;
     }
 
     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_S390_MEM_OP, &mem_op);
     if (ret < 0) {
         error_report("KVM_S390_MEM_OP failed: %s", strerror(-ret));
         abort();
     }
     return ret;
 }
 
 static uint8_t const *sw_bp_inst;
 static uint8_t sw_bp_ilen;
 
 static void determine_sw_breakpoint_instr(void)
 {
         /* DIAG 501 is used for sw breakpoints with old kernels */
         static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
         /* Instruction 0x0000 is used for sw breakpoints with recent kernels */
         static const uint8_t instr_0x0000[] = {0x00, 0x00};
 
         if (sw_bp_inst) {
             return;
         }
         if (kvm_vm_enable_cap(kvm_state, KVM_CAP_S390_USER_INSTR0, 0)) {
             sw_bp_inst = diag_501;
             sw_bp_ilen = sizeof(diag_501);
             DPRINTF("KVM: will use 4-byte sw breakpoints.\n");
         } else {
             sw_bp_inst = instr_0x0000;
             sw_bp_ilen = sizeof(instr_0x0000);
             DPRINTF("KVM: will use 2-byte sw breakpoints.\n");
         }
 }
 
 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 {
     determine_sw_breakpoint_instr();
 
     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn,
                             sw_bp_ilen, 0) ||
         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)sw_bp_inst, sw_bp_ilen, 1)) {
         return -EINVAL;
     }
     return 0;
 }
 
 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 {
     uint8_t t[MAX_ILEN];
 
     if (cpu_memory_rw_debug(cs, bp->pc, t, sw_bp_ilen, 0)) {
         return -EINVAL;
     } else if (memcmp(t, sw_bp_inst, sw_bp_ilen)) {
         return -EINVAL;
     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn,
                                    sw_bp_ilen, 1)) {
         return -EINVAL;
     }
 
     return 0;
 }
 
 static struct kvm_hw_breakpoint *find_hw_breakpoint(target_ulong addr,
                                                     int len, int type)
 {
     int n;
 
     for (n = 0; n < nb_hw_breakpoints; n++) {
         if (hw_breakpoints[n].addr == addr && hw_breakpoints[n].type == type &&
             (hw_breakpoints[n].len == len || len == -1)) {
             return &hw_breakpoints[n];
         }
     }
 
     return NULL;
 }
 
 static int insert_hw_breakpoint(target_ulong addr, int len, int type)
 {
     int size;
 
     if (find_hw_breakpoint(addr, len, type)) {
         return -EEXIST;
     }
 
     size = (nb_hw_breakpoints + 1) * sizeof(struct kvm_hw_breakpoint);
 
     if (!hw_breakpoints) {
         nb_hw_breakpoints = 0;
         hw_breakpoints = (struct kvm_hw_breakpoint *)g_try_malloc(size);
     } else {
         hw_breakpoints =
             (struct kvm_hw_breakpoint *)g_try_realloc(hw_breakpoints, size);
     }
 
     if (!hw_breakpoints) {
         nb_hw_breakpoints = 0;
         return -ENOMEM;
     }
 
     hw_breakpoints[nb_hw_breakpoints].addr = addr;
     hw_breakpoints[nb_hw_breakpoints].len = len;
     hw_breakpoints[nb_hw_breakpoints].type = type;
 
     nb_hw_breakpoints++;
 
     return 0;
 }
 
 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
                                   target_ulong len, int type)
 {
     switch (type) {
     case GDB_BREAKPOINT_HW:
         type = KVM_HW_BP;
         break;
     case GDB_WATCHPOINT_WRITE:
         if (len < 1) {
             return -EINVAL;
         }
         type = KVM_HW_WP_WRITE;
         break;
     default:
         return -ENOSYS;
     }
     return insert_hw_breakpoint(addr, len, type);
 }
 
 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
                                   target_ulong len, int type)
 {
     int size;
     struct kvm_hw_breakpoint *bp = find_hw_breakpoint(addr, len, type);
 
     if (bp == NULL) {
         return -ENOENT;
     }
 
     nb_hw_breakpoints--;
     if (nb_hw_breakpoints > 0) {
         /*
          * In order to trim the array, move the last element to the position to
          * be removed - if necessary.
          */
         if (bp != &hw_breakpoints[nb_hw_breakpoints]) {
             *bp = hw_breakpoints[nb_hw_breakpoints];
         }
         size = nb_hw_breakpoints * sizeof(struct kvm_hw_breakpoint);
         hw_breakpoints =
              g_realloc(hw_breakpoints, size);
     } else {
         g_free(hw_breakpoints);
         hw_breakpoints = NULL;
     }
 
     return 0;
 }
 
 void kvm_arch_remove_all_hw_breakpoints(void)
 {
     nb_hw_breakpoints = 0;
     g_free(hw_breakpoints);
     hw_breakpoints = NULL;
 }
 
 void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg)
 {
     int i;
 
     if (nb_hw_breakpoints > 0) {
         dbg->arch.nr_hw_bp = nb_hw_breakpoints;
         dbg->arch.hw_bp = hw_breakpoints;
 
         for (i = 0; i < nb_hw_breakpoints; ++i) {
             hw_breakpoints[i].phys_addr = s390_cpu_get_phys_addr_debug(cpu,
                                                        hw_breakpoints[i].addr);
         }
         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
     } else {
         dbg->arch.nr_hw_bp = 0;
         dbg->arch.hw_bp = NULL;
     }
 }
 
 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 {
 }
 
 MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
 {
     return MEMTXATTRS_UNSPECIFIED;
 }
 
 int kvm_arch_process_async_events(CPUState *cs)
 {
     return cs->halted;
 }
 
 static int s390_kvm_irq_to_interrupt(struct kvm_s390_irq *irq,
                                      struct kvm_s390_interrupt *interrupt)
 {
     int r = 0;
 
     interrupt->type = irq->type;
     switch (irq->type) {
     case KVM_S390_INT_VIRTIO:
         interrupt->parm = irq->u.ext.ext_params;
         /* fall through */
     case KVM_S390_INT_PFAULT_INIT:
     case KVM_S390_INT_PFAULT_DONE:
         interrupt->parm64 = irq->u.ext.ext_params2;
         break;
     case KVM_S390_PROGRAM_INT:
         interrupt->parm = irq->u.pgm.code;
         break;
     case KVM_S390_SIGP_SET_PREFIX:
         interrupt->parm = irq->u.prefix.address;
         break;
     case KVM_S390_INT_SERVICE:
         interrupt->parm = irq->u.ext.ext_params;
         break;
     case KVM_S390_MCHK:
         interrupt->parm = irq->u.mchk.cr14;
         interrupt->parm64 = irq->u.mchk.mcic;
         break;
     case KVM_S390_INT_EXTERNAL_CALL:
         interrupt->parm = irq->u.extcall.code;
         break;
     case KVM_S390_INT_EMERGENCY:
         interrupt->parm = irq->u.emerg.code;
         break;
     case KVM_S390_SIGP_STOP:
     case KVM_S390_RESTART:
         break; /* These types have no parameters */
     case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
         interrupt->parm = irq->u.io.subchannel_id << 16;
         interrupt->parm |= irq->u.io.subchannel_nr;
         interrupt->parm64 = (uint64_t)irq->u.io.io_int_parm << 32;
         interrupt->parm64 |= irq->u.io.io_int_word;
         break;
     default:
         r = -EINVAL;
         break;
     }
     return r;
 }
 
 static void inject_vcpu_irq_legacy(CPUState *cs, struct kvm_s390_irq *irq)
 {
     struct kvm_s390_interrupt kvmint = {};
     int r;
 
     r = s390_kvm_irq_to_interrupt(irq, &kvmint);
     if (r < 0) {
         fprintf(stderr, "%s called with bogus interrupt\n", __func__);
         exit(1);
     }
 
     r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
     if (r < 0) {
         fprintf(stderr, "KVM failed to inject interrupt\n");
         exit(1);
     }
 }
 
 void kvm_s390_vcpu_interrupt(S390CPU *cpu, struct kvm_s390_irq *irq)
 {
     CPUState *cs = CPU(cpu);
     int r;
 
     if (cap_s390_irq) {
         r = kvm_vcpu_ioctl(cs, KVM_S390_IRQ, irq);
         if (!r) {
             return;
         }
         error_report("KVM failed to inject interrupt %llx", irq->type);
         exit(1);
     }
 
     inject_vcpu_irq_legacy(cs, irq);
 }
 
 void kvm_s390_floating_interrupt_legacy(struct kvm_s390_irq *irq)
 {
     struct kvm_s390_interrupt kvmint = {};
     int r;
 
     r = s390_kvm_irq_to_interrupt(irq, &kvmint);
     if (r < 0) {
         fprintf(stderr, "%s called with bogus interrupt\n", __func__);
         exit(1);
     }
 
     r = kvm_vm_ioctl(kvm_state, KVM_S390_INTERRUPT, &kvmint);
     if (r < 0) {
         fprintf(stderr, "KVM failed to inject interrupt\n");
         exit(1);
     }
 }
 
 void kvm_s390_program_interrupt(S390CPU *cpu, uint16_t code)
 {
     struct kvm_s390_irq irq = {
         .type = KVM_S390_PROGRAM_INT,
         .u.pgm.code = code,
     };
     qemu_log_mask(CPU_LOG_INT, "program interrupt at %#" PRIx64 "\n",
                   cpu->env.psw.addr);
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
 void kvm_s390_access_exception(S390CPU *cpu, uint16_t code, uint64_t te_code)
 {
     struct kvm_s390_irq irq = {
         .type = KVM_S390_PROGRAM_INT,
         .u.pgm.code = code,
         .u.pgm.trans_exc_code = te_code,
         .u.pgm.exc_access_id = te_code & 3,
     };
 
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
 static void kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
                                  uint16_t ipbh0)
 {
     CPUS390XState *env = &cpu->env;
     uint64_t sccb;
     uint32_t code;
     int r;
 
     sccb = env->regs[ipbh0 & 0xf];
     code = env->regs[(ipbh0 & 0xf0) >> 4];
 
     switch (run->s390_sieic.icptcode) {
     case ICPT_PV_INSTR_NOTIFICATION:
         g_assert(s390_is_pv());
         /* The notification intercepts are currently handled by KVM */
         error_report("unexpected SCLP PV notification");
         exit(1);
         break;
     case ICPT_PV_INSTR:
         g_assert(s390_is_pv());
         sclp_service_call_protected(env, sccb, code);
         /* Setting the CC is done by the Ultravisor. */
         break;
     case ICPT_INSTRUCTION:
         g_assert(!s390_is_pv());
         r = sclp_service_call(env, sccb, code);
         if (r < 0) {
             kvm_s390_program_interrupt(cpu, -r);
             return;
         }
         setcc(cpu, r);
     }
 }
 
 static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 {
     CPUS390XState *env = &cpu->env;
     int rc = 0;
     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 
     switch (ipa1) {
     case PRIV_B2_XSCH:
         ioinst_handle_xsch(cpu, env->regs[1], RA_IGNORED);
         break;
     case PRIV_B2_CSCH:
         ioinst_handle_csch(cpu, env->regs[1], RA_IGNORED);
         break;
     case PRIV_B2_HSCH:
         ioinst_handle_hsch(cpu, env->regs[1], RA_IGNORED);
         break;
     case PRIV_B2_MSCH:
         ioinst_handle_msch(cpu, env->regs[1], run->s390_sieic.ipb, RA_IGNORED);
         break;
     case PRIV_B2_SSCH:
         ioinst_handle_ssch(cpu, env->regs[1], run->s390_sieic.ipb, RA_IGNORED);
         break;
     case PRIV_B2_STCRW:
         ioinst_handle_stcrw(cpu, run->s390_sieic.ipb, RA_IGNORED);
         break;
     case PRIV_B2_STSCH:
         ioinst_handle_stsch(cpu, env->regs[1], run->s390_sieic.ipb, RA_IGNORED);
         break;
     case PRIV_B2_TSCH:
         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
         fprintf(stderr, "Spurious tsch intercept\n");
         break;
     case PRIV_B2_CHSC:
         ioinst_handle_chsc(cpu, run->s390_sieic.ipb, RA_IGNORED);
         break;
     case PRIV_B2_TPI:
         /* This should have been handled by kvm already. */
         fprintf(stderr, "Spurious tpi intercept\n");
         break;
     case PRIV_B2_SCHM:
         ioinst_handle_schm(cpu, env->regs[1], env->regs[2],
                            run->s390_sieic.ipb, RA_IGNORED);
         break;
     case PRIV_B2_RSCH:
         ioinst_handle_rsch(cpu, env->regs[1], RA_IGNORED);
         break;
     case PRIV_B2_RCHP:
         ioinst_handle_rchp(cpu, env->regs[1], RA_IGNORED);
         break;
     case PRIV_B2_STCPS:
         /* We do not provide this instruction, it is suppressed. */
         break;
     case PRIV_B2_SAL:
         ioinst_handle_sal(cpu, env->regs[1], RA_IGNORED);
         break;
     case PRIV_B2_SIGA:
         /* Not provided, set CC = 3 for subchannel not operational */
         setcc(cpu, 3);
         break;
     case PRIV_B2_SCLP_CALL:
         kvm_sclp_service_call(cpu, run, ipbh0);
         break;
     default:
         rc = -1;
         DPRINTF("KVM: unhandled PRIV: 0xb2%x\n", ipa1);
         break;
     }
 
     return rc;
 }
 
 static uint64_t get_base_disp_rxy(S390CPU *cpu, struct kvm_run *run,
                                   uint8_t *ar)
 {
     CPUS390XState *env = &cpu->env;
     uint32_t x2 = (run->s390_sieic.ipa & 0x000f);
     uint32_t base2 = run->s390_sieic.ipb >> 28;
     uint32_t disp2 = ((run->s390_sieic.ipb & 0x0fff0000) >> 16) +
                      ((run->s390_sieic.ipb & 0xff00) << 4);
 
     if (disp2 & 0x80000) {
         disp2 += 0xfff00000;
     }
     if (ar) {
         *ar = base2;
     }
 
     return (base2 ? env->regs[base2] : 0) +
            (x2 ? env->regs[x2] : 0) + (long)(int)disp2;
 }
 
 static uint64_t get_base_disp_rsy(S390CPU *cpu, struct kvm_run *run,
                                   uint8_t *ar)
 {
     CPUS390XState *env = &cpu->env;
     uint32_t base2 = run->s390_sieic.ipb >> 28;
     uint32_t disp2 = ((run->s390_sieic.ipb & 0x0fff0000) >> 16) +
                      ((run->s390_sieic.ipb & 0xff00) << 4);
 
     if (disp2 & 0x80000) {
         disp2 += 0xfff00000;
     }
     if (ar) {
         *ar = base2;
     }
 
     return (base2 ? env->regs[base2] : 0) + (long)(int)disp2;
 }
 
 static int kvm_clp_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r2 = (run->s390_sieic.ipb & 0x000f0000) >> 16;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         return clp_service_call(cpu, r2, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int kvm_pcilg_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r1 = (run->s390_sieic.ipb & 0x00f00000) >> 20;
     uint8_t r2 = (run->s390_sieic.ipb & 0x000f0000) >> 16;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         return pcilg_service_call(cpu, r1, r2, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int kvm_pcistg_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r1 = (run->s390_sieic.ipb & 0x00f00000) >> 20;
     uint8_t r2 = (run->s390_sieic.ipb & 0x000f0000) >> 16;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         return pcistg_service_call(cpu, r1, r2, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int kvm_stpcifc_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
     uint64_t fiba;
     uint8_t ar;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         fiba = get_base_disp_rxy(cpu, run, &ar);
 
         return stpcifc_service_call(cpu, r1, fiba, ar, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int kvm_sic_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     CPUS390XState *env = &cpu->env;
     uint8_t r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
     uint8_t r3 = run->s390_sieic.ipa & 0x000f;
     uint8_t isc;
     uint16_t mode;
     int r;
 
     mode = env->regs[r1] & 0xffff;
     isc = (env->regs[r3] >> 27) & 0x7;
     r = css_do_sic(env, isc, mode);
     if (r) {
         kvm_s390_program_interrupt(cpu, -r);
     }
 
     return 0;
 }
 
 static int kvm_rpcit_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r1 = (run->s390_sieic.ipb & 0x00f00000) >> 20;
     uint8_t r2 = (run->s390_sieic.ipb & 0x000f0000) >> 16;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         return rpcit_service_call(cpu, r1, r2, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int kvm_pcistb_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
     uint8_t r3 = run->s390_sieic.ipa & 0x000f;
     uint64_t gaddr;
     uint8_t ar;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         gaddr = get_base_disp_rsy(cpu, run, &ar);
 
         return pcistb_service_call(cpu, r1, r3, gaddr, ar, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int kvm_mpcifc_service_call(S390CPU *cpu, struct kvm_run *run)
 {
     uint8_t r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
     uint64_t fiba;
     uint8_t ar;
 
     if (s390_has_feat(S390_FEAT_ZPCI)) {
         fiba = get_base_disp_rxy(cpu, run, &ar);
 
         return mpcifc_service_call(cpu, r1, fiba, ar, RA_IGNORED);
     } else {
         return -1;
     }
 }
 
 static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 {
     int r = 0;
 
     switch (ipa1) {
     case PRIV_B9_CLP:
         r = kvm_clp_service_call(cpu, run);
         break;
     case PRIV_B9_PCISTG:
         r = kvm_pcistg_service_call(cpu, run);
         break;
     case PRIV_B9_PCILG:
         r = kvm_pcilg_service_call(cpu, run);
         break;
     case PRIV_B9_RPCIT:
         r = kvm_rpcit_service_call(cpu, run);
         break;
     case PRIV_B9_EQBS:
         /* just inject exception */
         r = -1;
         break;
     default:
         r = -1;
         DPRINTF("KVM: unhandled PRIV: 0xb9%x\n", ipa1);
         break;
     }
 
     return r;
 }
 
 static int handle_eb(S390CPU *cpu, struct kvm_run *run, uint8_t ipbl)
 {
     int r = 0;
 
     switch (ipbl) {
     case PRIV_EB_PCISTB:
         r = kvm_pcistb_service_call(cpu, run);
         break;
     case PRIV_EB_SIC:
         r = kvm_sic_service_call(cpu, run);
         break;
     case PRIV_EB_SQBS:
         /* just inject exception */
         r = -1;
         break;
     default:
         r = -1;
         DPRINTF("KVM: unhandled PRIV: 0xeb%x\n", ipbl);
         break;
     }
 
     return r;
 }
 
 static int handle_e3(S390CPU *cpu, struct kvm_run *run, uint8_t ipbl)
 {
     int r = 0;
 
     switch (ipbl) {
     case PRIV_E3_MPCIFC:
         r = kvm_mpcifc_service_call(cpu, run);
         break;
     case PRIV_E3_STPCIFC:
         r = kvm_stpcifc_service_call(cpu, run);
         break;
     default:
         r = -1;
         DPRINTF("KVM: unhandled PRIV: 0xe3%x\n", ipbl);
         break;
     }
 
     return r;
 }
 
 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 {
     CPUS390XState *env = &cpu->env;
     int ret;
 
     ret = s390_virtio_hypercall(env);
     if (ret == -EINVAL) {
         kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
         return 0;
     }
 
     return ret;
 }
 
 static void kvm_handle_diag_288(S390CPU *cpu, struct kvm_run *run)
 {
     uint64_t r1, r3;
     int rc;
 
     r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
     r3 = run->s390_sieic.ipa & 0x000f;
     rc = handle_diag_288(&cpu->env, r1, r3);
     if (rc) {
         kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
     }
 }
 
 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 {
     uint64_t r1, r3;
 
     r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
     r3 = run->s390_sieic.ipa & 0x000f;
     handle_diag_308(&cpu->env, r1, r3, RA_IGNORED);
 }
 
 static int handle_sw_breakpoint(S390CPU *cpu, struct kvm_run *run)
 {
     CPUS390XState *env = &cpu->env;
     unsigned long pc;
 
     pc = env->psw.addr - sw_bp_ilen;
     if (kvm_find_sw_breakpoint(CPU(cpu), pc)) {
         env->psw.addr = pc;
         return EXCP_DEBUG;
     }
 
     return -ENOENT;
 }
 
 void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info)
 {
     CPUS390XState *env = &S390_CPU(cs)->env;
 
     /* Feat bit is set only if KVM supports sync for diag318 */
     if (s390_has_feat(S390_FEAT_DIAG_318)) {
         env->diag318_info = diag318_info;
         cs->kvm_run->s.regs.diag318 = diag318_info;
         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
         /*
          * diag 318 info is zeroed during a clear reset and
          * diag 308 IPL subcodes.
          */
     }
 }
 
 static void handle_diag_318(S390CPU *cpu, struct kvm_run *run)
 {
     uint64_t reg = (run->s390_sieic.ipa & 0x00f0) >> 4;
     uint64_t diag318_info = run->s.regs.gprs[reg];
     CPUState *t;
 
     /*
      * DIAG 318 can only be enabled with KVM support. As such, let's
      * ensure a guest cannot execute this instruction erroneously.
      */
     if (!s390_has_feat(S390_FEAT_DIAG_318)) {
         kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
         return;
     }
 
     CPU_FOREACH(t) {
         run_on_cpu(t, s390_do_cpu_set_diag318,
                    RUN_ON_CPU_HOST_ULONG(diag318_info));
     }
 }
 
 #define DIAG_KVM_CODE_MASK 0x000000000000ffff
 
 static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb)
 {
     int r = 0;
     uint16_t func_code;
 
     /*
      * For any diagnose call we support, bits 48-63 of the resulting
      * address specify the function code; the remainder is ignored.
      */
     func_code = decode_basedisp_rs(&cpu->env, ipb, NULL) & DIAG_KVM_CODE_MASK;
     switch (func_code) {
     case DIAG_TIMEREVENT:
         kvm_handle_diag_288(cpu, run);
         break;
     case DIAG_IPL:
         kvm_handle_diag_308(cpu, run);
         break;
     case DIAG_SET_CONTROL_PROGRAM_CODES:
         handle_diag_318(cpu, run);
         break;
     case DIAG_KVM_HYPERCALL:
         r = handle_hypercall(cpu, run);
         break;
     case DIAG_KVM_BREAKPOINT:
         r = handle_sw_breakpoint(cpu, run);
         break;
     default:
         DPRINTF("KVM: unknown DIAG: 0x%x\n", func_code);
         kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
         break;
     }
 
     return r;
 }
 
 static int kvm_s390_handle_sigp(S390CPU *cpu, uint8_t ipa1, uint32_t ipb)
 {
     CPUS390XState *env = &cpu->env;
     const uint8_t r1 = ipa1 >> 4;
     const uint8_t r3 = ipa1 & 0x0f;
     int ret;
     uint8_t order;
 
     /* get order code */
     order = decode_basedisp_rs(env, ipb, NULL) & SIGP_ORDER_MASK;
 
     ret = handle_sigp(env, order, r1, r3);
     setcc(cpu, ret);
     return 0;
 }
 
 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 {
     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
     int r = -1;
 
     DPRINTF("handle_instruction 0x%x 0x%x\n",
             run->s390_sieic.ipa, run->s390_sieic.ipb);
     switch (ipa0) {
     case IPA0_B2:
         r = handle_b2(cpu, run, ipa1);
         break;
     case IPA0_B9:
         r = handle_b9(cpu, run, ipa1);
         break;
     case IPA0_EB:
         r = handle_eb(cpu, run, run->s390_sieic.ipb & 0xff);
         break;
     case IPA0_E3:
         r = handle_e3(cpu, run, run->s390_sieic.ipb & 0xff);
         break;
     case IPA0_DIAG:
         r = handle_diag(cpu, run, run->s390_sieic.ipb);
         break;
     case IPA0_SIGP:
         r = kvm_s390_handle_sigp(cpu, ipa1, run->s390_sieic.ipb);
         break;
     }
 
     if (r < 0) {
         r = 0;
         kvm_s390_program_interrupt(cpu, PGM_OPERATION);
     }
 
     return r;
 }
 
 static void unmanageable_intercept(S390CPU *cpu, S390CrashReason reason,
                                    int pswoffset)
 {
     CPUState *cs = CPU(cpu);
 
     s390_cpu_halt(cpu);
     cpu->env.crash_reason = reason;
     qemu_system_guest_panicked(cpu_get_crash_info(cs));
 }
 
 /* try to detect pgm check loops */
 static int handle_oper_loop(S390CPU *cpu, struct kvm_run *run)
 {
     CPUState *cs = CPU(cpu);
     PSW oldpsw, newpsw;
 
     newpsw.mask = ldq_phys(cs->as, cpu->env.psa +
                            offsetof(LowCore, program_new_psw));
     newpsw.addr = ldq_phys(cs->as, cpu->env.psa +
                            offsetof(LowCore, program_new_psw) + 8);
     oldpsw.mask  = run->psw_mask;
     oldpsw.addr  = run->psw_addr;
     /*
      * Avoid endless loops of operation exceptions, if the pgm new
      * PSW will cause a new operation exception.
      * The heuristic checks if the pgm new psw is within 6 bytes before
      * the faulting psw address (with same DAT, AS settings) and the
      * new psw is not a wait psw and the fault was not triggered by
      * problem state. In that case go into crashed state.
      */
 
     if (oldpsw.addr - newpsw.addr <= 6 &&
         !(newpsw.mask & PSW_MASK_WAIT) &&
         !(oldpsw.mask & PSW_MASK_PSTATE) &&
         (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
         (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT)) {
         unmanageable_intercept(cpu, S390_CRASH_REASON_OPINT_LOOP,
                                offsetof(LowCore, program_new_psw));
         return EXCP_HALTED;
     }
     return 0;
 }
 
 static int handle_intercept(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     struct kvm_run *run = cs->kvm_run;
     int icpt_code = run->s390_sieic.icptcode;
     int r = 0;
 
     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code, (long)run->psw_addr);
     switch (icpt_code) {
         case ICPT_INSTRUCTION:
         case ICPT_PV_INSTR:
         case ICPT_PV_INSTR_NOTIFICATION:
             r = handle_instruction(cpu, run);
             break;
         case ICPT_PROGRAM:
             unmanageable_intercept(cpu, S390_CRASH_REASON_PGMINT_LOOP,
                                    offsetof(LowCore, program_new_psw));
             r = EXCP_HALTED;
             break;
         case ICPT_EXT_INT:
             unmanageable_intercept(cpu, S390_CRASH_REASON_EXTINT_LOOP,
                                    offsetof(LowCore, external_new_psw));
             r = EXCP_HALTED;
             break;
         case ICPT_WAITPSW:
             /* disabled wait, since enabled wait is handled in kernel */
             s390_handle_wait(cpu);
             r = EXCP_HALTED;
             break;
         case ICPT_CPU_STOP:
             do_stop_interrupt(&cpu->env);
             r = EXCP_HALTED;
             break;
         case ICPT_OPEREXC:
             /* check for break points */
             r = handle_sw_breakpoint(cpu, run);
             if (r == -ENOENT) {
                 /* Then check for potential pgm check loops */
                 r = handle_oper_loop(cpu, run);
                 if (r == 0) {
                     kvm_s390_program_interrupt(cpu, PGM_OPERATION);
                 }
             }
             break;
         case ICPT_SOFT_INTERCEPT:
             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
             exit(1);
             break;
         case ICPT_IO:
             fprintf(stderr, "KVM unimplemented icpt IO\n");
             exit(1);
             break;
         default:
             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
             exit(1);
             break;
     }
 
     return r;
 }
 
 static int handle_tsch(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     struct kvm_run *run = cs->kvm_run;
     int ret;
 
     ret = ioinst_handle_tsch(cpu, cpu->env.regs[1], run->s390_tsch.ipb,
                              RA_IGNORED);
     if (ret < 0) {
         /*
          * Failure.
          * If an I/O interrupt had been dequeued, we have to reinject it.
          */
         if (run->s390_tsch.dequeued) {
             s390_io_interrupt(run->s390_tsch.subchannel_id,
                               run->s390_tsch.subchannel_nr,
                               run->s390_tsch.io_int_parm,
                               run->s390_tsch.io_int_word);
         }
         ret = 0;
     }
     return ret;
 }
 
 static void insert_stsi_3_2_2(S390CPU *cpu, __u64 addr, uint8_t ar)
 {
     const MachineState *ms = MACHINE(qdev_get_machine());
     uint16_t conf_cpus = 0, reserved_cpus = 0;
     SysIB_322 sysib;
     int del, i;
 
     if (s390_is_pv()) {
         s390_cpu_pv_mem_read(cpu, 0, &sysib, sizeof(sysib));
     } else if (s390_cpu_virt_mem_read(cpu, addr, ar, &sysib, sizeof(sysib))) {
         return;
     }
     /* Shift the stack of Extended Names to prepare for our own data */
     memmove(&sysib.ext_names[1], &sysib.ext_names[0],
             sizeof(sysib.ext_names[0]) * (sysib.count - 1));
     /* First virt level, that doesn't provide Ext Names delimits stack. It is
      * assumed it's not capable of managing Extended Names for lower levels.
      */
     for (del = 1; del < sysib.count; del++) {
         if (!sysib.vm[del].ext_name_encoding || !sysib.ext_names[del][0]) {
             break;
         }
     }
     if (del < sysib.count) {
         memset(sysib.ext_names[del], 0,
                sizeof(sysib.ext_names[0]) * (sysib.count - del));
     }
 
     /* count the cpus and split them into configured and reserved ones */
     for (i = 0; i < ms->possible_cpus->len; i++) {
         if (ms->possible_cpus->cpus[i].cpu) {
             conf_cpus++;
         } else {
             reserved_cpus++;
         }
     }
     sysib.vm[0].total_cpus = conf_cpus + reserved_cpus;
     sysib.vm[0].conf_cpus = conf_cpus;
     sysib.vm[0].reserved_cpus = reserved_cpus;
 
     /* Insert short machine name in EBCDIC, padded with blanks */
     if (qemu_name) {
         memset(sysib.vm[0].name, 0x40, sizeof(sysib.vm[0].name));
         ebcdic_put(sysib.vm[0].name, qemu_name, MIN(sizeof(sysib.vm[0].name),
                                                     strlen(qemu_name)));
     }
     sysib.vm[0].ext_name_encoding = 2; /* 2 = UTF-8 */
     /* If hypervisor specifies zero Extended Name in STSI322 SYSIB, it's
      * considered by s390 as not capable of providing any Extended Name.
      * Therefore if no name was specified on qemu invocation, we go with the
      * same "KVMguest" default, which KVM has filled into short name field.
      */
     strpadcpy((char *)sysib.ext_names[0],
               sizeof(sysib.ext_names[0]),
               qemu_name ?: "KVMguest", '\0');
 
     /* Insert UUID */
     memcpy(sysib.vm[0].uuid, &qemu_uuid, sizeof(sysib.vm[0].uuid));
 
     if (s390_is_pv()) {
         s390_cpu_pv_mem_write(cpu, 0, &sysib, sizeof(sysib));
     } else {
         s390_cpu_virt_mem_write(cpu, addr, ar, &sysib, sizeof(sysib));
     }
 }
 
 static int handle_stsi(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     struct kvm_run *run = cs->kvm_run;
 
     switch (run->s390_stsi.fc) {
     case 3:
         if (run->s390_stsi.sel1 != 2 || run->s390_stsi.sel2 != 2) {
             return 0;
         }
         /* Only sysib 3.2.2 needs post-handling for now. */
         insert_stsi_3_2_2(cpu, run->s390_stsi.addr, run->s390_stsi.ar);
         return 0;
     default:
         return 0;
     }
 }
 
 static int kvm_arch_handle_debug_exit(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     struct kvm_run *run = cs->kvm_run;
 
     int ret = 0;
     struct kvm_debug_exit_arch *arch_info = &run->debug.arch;
 
     switch (arch_info->type) {
     case KVM_HW_WP_WRITE:
         if (find_hw_breakpoint(arch_info->addr, -1, arch_info->type)) {
             cs->watchpoint_hit = &hw_watchpoint;
             hw_watchpoint.vaddr = arch_info->addr;
             hw_watchpoint.flags = BP_MEM_WRITE;
             ret = EXCP_DEBUG;
         }
         break;
     case KVM_HW_BP:
         if (find_hw_breakpoint(arch_info->addr, -1, arch_info->type)) {
             ret = EXCP_DEBUG;
         }
         break;
     case KVM_SINGLESTEP:
         if (cs->singlestep_enabled) {
             ret = EXCP_DEBUG;
         }
         break;
     default:
         ret = -ENOSYS;
     }
 
     return ret;
 }
 
 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 {
     S390CPU *cpu = S390_CPU(cs);
     int ret = 0;
 
     qemu_mutex_lock_iothread();
 
     kvm_cpu_synchronize_state(cs);
 
     switch (run->exit_reason) {
         case KVM_EXIT_S390_SIEIC:
             ret = handle_intercept(cpu);
             break;
         case KVM_EXIT_S390_RESET:
             s390_ipl_reset_request(cs, S390_RESET_REIPL);
             break;
         case KVM_EXIT_S390_TSCH:
             ret = handle_tsch(cpu);
             break;
         case KVM_EXIT_S390_STSI:
             ret = handle_stsi(cpu);
             break;
         case KVM_EXIT_DEBUG:
             ret = kvm_arch_handle_debug_exit(cpu);
             break;
         default:
             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
             break;
     }
     qemu_mutex_unlock_iothread();
 
     if (ret == 0) {
         ret = EXCP_INTERRUPT;
     }
     return ret;
 }
 
 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 {
     return true;
 }
 
 void kvm_s390_enable_css_support(S390CPU *cpu)
 {
     int r;
 
     /* Activate host kernel channel subsystem support. */
     r = kvm_vcpu_enable_cap(CPU(cpu), KVM_CAP_S390_CSS_SUPPORT, 0);
     assert(r == 0);
 }
 
 void kvm_arch_init_irq_routing(KVMState *s)
 {
     /*
      * Note that while irqchip capabilities generally imply that cpustates
      * are handled in-kernel, it is not true for s390 (yet); therefore, we
      * have to override the common code kvm_halt_in_kernel_allowed setting.
      */
     if (kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
         kvm_gsi_routing_allowed = true;
         kvm_halt_in_kernel_allowed = false;
     }
 }
 
 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
                                     int vq, bool assign)
 {
     struct kvm_ioeventfd kick = {
         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
         KVM_IOEVENTFD_FLAG_DATAMATCH,
         .fd = event_notifier_get_fd(notifier),
         .datamatch = vq,
         .addr = sch,
         .len = 8,
     };
     trace_kvm_assign_subch_ioeventfd(kick.fd, kick.addr, assign,
                                      kick.datamatch);
     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
         return -ENOSYS;
     }
     if (!assign) {
         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
     }
     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 }
 
 int kvm_s390_get_protected_dump(void)
 {
     return cap_protected_dump;
 }
 
 int kvm_s390_get_ri(void)
 {
     return cap_ri;
 }
 
 int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t cpu_state)
 {
     struct kvm_mp_state mp_state = {};
     int ret;
 
     /* the kvm part might not have been initialized yet */
     if (CPU(cpu)->kvm_state == NULL) {
         return 0;
     }
 
     switch (cpu_state) {
     case S390_CPU_STATE_STOPPED:
         mp_state.mp_state = KVM_MP_STATE_STOPPED;
         break;
     case S390_CPU_STATE_CHECK_STOP:
         mp_state.mp_state = KVM_MP_STATE_CHECK_STOP;
         break;
     case S390_CPU_STATE_OPERATING:
         mp_state.mp_state = KVM_MP_STATE_OPERATING;
         break;
     case S390_CPU_STATE_LOAD:
         mp_state.mp_state = KVM_MP_STATE_LOAD;
         break;
     default:
         error_report("Requested CPU state is not a valid S390 CPU state: %u",
                      cpu_state);
         exit(1);
     }
 
     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
     if (ret) {
         trace_kvm_failed_cpu_state_set(CPU(cpu)->cpu_index, cpu_state,
                                        strerror(-ret));
     }
 
     return ret;
 }
 
 void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
 {
     unsigned int max_cpus = MACHINE(qdev_get_machine())->smp.max_cpus;
     struct kvm_s390_irq_state irq_state = {
         .buf = (uint64_t) cpu->irqstate,
         .len = VCPU_IRQ_BUF_SIZE(max_cpus),
     };
     CPUState *cs = CPU(cpu);
     int32_t bytes;
 
     if (!kvm_check_extension(kvm_state, KVM_CAP_S390_IRQ_STATE)) {
         return;
     }
 
     bytes = kvm_vcpu_ioctl(cs, KVM_S390_GET_IRQ_STATE, &irq_state);
     if (bytes < 0) {
         cpu->irqstate_saved_size = 0;
         error_report("Migration of interrupt state failed");
         return;
     }
 
     cpu->irqstate_saved_size = bytes;
 }
 
 int kvm_s390_vcpu_interrupt_post_load(S390CPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     struct kvm_s390_irq_state irq_state = {
         .buf = (uint64_t) cpu->irqstate,
         .len = cpu->irqstate_saved_size,
     };
     int r;
 
     if (cpu->irqstate_saved_size == 0) {
         return 0;
     }
 
     if (!kvm_check_extension(kvm_state, KVM_CAP_S390_IRQ_STATE)) {
         return -ENOSYS;
     }
 
     r = kvm_vcpu_ioctl(cs, KVM_S390_SET_IRQ_STATE, &irq_state);
     if (r) {
         error_report("Setting interrupt state failed %d", r);
     }
     return r;
 }
 
 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
                              uint64_t address, uint32_t data, PCIDevice *dev)
 {
     S390PCIBusDevice *pbdev;
     uint32_t vec = data & ZPCI_MSI_VEC_MASK;
 
     if (!dev) {
         DPRINTF("add_msi_route no pci device\n");
         return -ENODEV;
     }
 
     pbdev = s390_pci_find_dev_by_target(s390_get_phb(), DEVICE(dev)->id);
     if (!pbdev) {
         DPRINTF("add_msi_route no zpci device\n");
         return -ENODEV;
     }
 
     route->type = KVM_IRQ_ROUTING_S390_ADAPTER;
     route->flags = 0;
     route->u.adapter.summary_addr = pbdev->routes.adapter.summary_addr;
     route->u.adapter.ind_addr = pbdev->routes.adapter.ind_addr;
     route->u.adapter.summary_offset = pbdev->routes.adapter.summary_offset;
     route->u.adapter.ind_offset = pbdev->routes.adapter.ind_offset + vec;
     route->u.adapter.adapter_id = pbdev->routes.adapter.adapter_id;
     return 0;
 }
 
 int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
                                 int vector, PCIDevice *dev)
 {
     return 0;
 }
 
 int kvm_arch_release_virq_post(int virq)
 {
     return 0;
 }
 
 int kvm_arch_msi_data_to_gsi(uint32_t data)
 {
     abort();
 }
 
 static int query_cpu_subfunc(S390FeatBitmap features)
 {
     struct kvm_s390_vm_cpu_subfunc prop = {};
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_CPU_MODEL,
         .attr = KVM_S390_VM_CPU_MACHINE_SUBFUNC,
         .addr = (uint64_t) &prop,
     };
     int rc;
 
     rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
     if (rc) {
         return  rc;
     }
 
     /*
      * We're going to add all subfunctions now, if the corresponding feature
      * is available that unlocks the query functions.
      */
     s390_add_from_feat_block(features, S390_FEAT_TYPE_PLO, prop.plo);
     if (test_bit(S390_FEAT_TOD_CLOCK_STEERING, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_PTFF, prop.ptff);
     }
     if (test_bit(S390_FEAT_MSA, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KMAC, prop.kmac);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KMC, prop.kmc);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KM, prop.km);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KIMD, prop.kimd);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KLMD, prop.klmd);
     }
     if (test_bit(S390_FEAT_MSA_EXT_3, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_PCKMO, prop.pckmo);
     }
     if (test_bit(S390_FEAT_MSA_EXT_4, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KMCTR, prop.kmctr);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KMF, prop.kmf);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KMO, prop.kmo);
         s390_add_from_feat_block(features, S390_FEAT_TYPE_PCC, prop.pcc);
     }
     if (test_bit(S390_FEAT_MSA_EXT_5, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_PPNO, prop.ppno);
     }
     if (test_bit(S390_FEAT_MSA_EXT_8, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KMA, prop.kma);
     }
     if (test_bit(S390_FEAT_MSA_EXT_9, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_KDSA, prop.kdsa);
     }
     if (test_bit(S390_FEAT_ESORT_BASE, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_SORTL, prop.sortl);
     }
     if (test_bit(S390_FEAT_DEFLATE_BASE, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_DFLTCC, prop.dfltcc);
     }
     return 0;
 }
 
 static int configure_cpu_subfunc(const S390FeatBitmap features)
 {
     struct kvm_s390_vm_cpu_subfunc prop = {};
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_CPU_MODEL,
         .attr = KVM_S390_VM_CPU_PROCESSOR_SUBFUNC,
         .addr = (uint64_t) &prop,
     };
 
     if (!kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                            KVM_S390_VM_CPU_PROCESSOR_SUBFUNC)) {
         /* hardware support might be missing, IBC will handle most of this */
         return 0;
     }
 
     s390_fill_feat_block(features, S390_FEAT_TYPE_PLO, prop.plo);
     if (test_bit(S390_FEAT_TOD_CLOCK_STEERING, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_PTFF, prop.ptff);
     }
     if (test_bit(S390_FEAT_MSA, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_KMAC, prop.kmac);
         s390_fill_feat_block(features, S390_FEAT_TYPE_KMC, prop.kmc);
         s390_fill_feat_block(features, S390_FEAT_TYPE_KM, prop.km);
         s390_fill_feat_block(features, S390_FEAT_TYPE_KIMD, prop.kimd);
         s390_fill_feat_block(features, S390_FEAT_TYPE_KLMD, prop.klmd);
     }
     if (test_bit(S390_FEAT_MSA_EXT_3, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_PCKMO, prop.pckmo);
     }
     if (test_bit(S390_FEAT_MSA_EXT_4, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_KMCTR, prop.kmctr);
         s390_fill_feat_block(features, S390_FEAT_TYPE_KMF, prop.kmf);
         s390_fill_feat_block(features, S390_FEAT_TYPE_KMO, prop.kmo);
         s390_fill_feat_block(features, S390_FEAT_TYPE_PCC, prop.pcc);
     }
     if (test_bit(S390_FEAT_MSA_EXT_5, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_PPNO, prop.ppno);
     }
     if (test_bit(S390_FEAT_MSA_EXT_8, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_KMA, prop.kma);
     }
     if (test_bit(S390_FEAT_MSA_EXT_9, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_KDSA, prop.kdsa);
     }
     if (test_bit(S390_FEAT_ESORT_BASE, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_SORTL, prop.sortl);
     }
     if (test_bit(S390_FEAT_DEFLATE_BASE, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_DFLTCC, prop.dfltcc);
     }
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
 static int kvm_to_feat[][2] = {
     { KVM_S390_VM_CPU_FEAT_ESOP, S390_FEAT_ESOP },
     { KVM_S390_VM_CPU_FEAT_SIEF2, S390_FEAT_SIE_F2 },
     { KVM_S390_VM_CPU_FEAT_64BSCAO , S390_FEAT_SIE_64BSCAO },
     { KVM_S390_VM_CPU_FEAT_SIIF, S390_FEAT_SIE_SIIF },
     { KVM_S390_VM_CPU_FEAT_GPERE, S390_FEAT_SIE_GPERE },
     { KVM_S390_VM_CPU_FEAT_GSLS, S390_FEAT_SIE_GSLS },
     { KVM_S390_VM_CPU_FEAT_IB, S390_FEAT_SIE_IB },
     { KVM_S390_VM_CPU_FEAT_CEI, S390_FEAT_SIE_CEI },
     { KVM_S390_VM_CPU_FEAT_IBS, S390_FEAT_SIE_IBS },
     { KVM_S390_VM_CPU_FEAT_SKEY, S390_FEAT_SIE_SKEY },
     { KVM_S390_VM_CPU_FEAT_CMMA, S390_FEAT_SIE_CMMA },
     { KVM_S390_VM_CPU_FEAT_PFMFI, S390_FEAT_SIE_PFMFI},
     { KVM_S390_VM_CPU_FEAT_SIGPIF, S390_FEAT_SIE_SIGPIF},
     { KVM_S390_VM_CPU_FEAT_KSS, S390_FEAT_SIE_KSS},
 };
 
 static int query_cpu_feat(S390FeatBitmap features)
 {
     struct kvm_s390_vm_cpu_feat prop = {};
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_CPU_MODEL,
         .attr = KVM_S390_VM_CPU_MACHINE_FEAT,
         .addr = (uint64_t) &prop,
     };
     int rc;
     int i;
 
     rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
     if (rc) {
         return  rc;
     }
 
     for (i = 0; i < ARRAY_SIZE(kvm_to_feat); i++) {
         if (test_be_bit(kvm_to_feat[i][0], (uint8_t *) prop.feat)) {
             set_bit(kvm_to_feat[i][1], features);
         }
     }
     return 0;
 }
 
 static int configure_cpu_feat(const S390FeatBitmap features)
 {
     struct kvm_s390_vm_cpu_feat prop = {};
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_CPU_MODEL,
         .attr = KVM_S390_VM_CPU_PROCESSOR_FEAT,
         .addr = (uint64_t) &prop,
     };
     int i;
 
     for (i = 0; i < ARRAY_SIZE(kvm_to_feat); i++) {
         if (test_bit(kvm_to_feat[i][1], features)) {
             set_be_bit(kvm_to_feat[i][0], (uint8_t *) prop.feat);
         }
     }
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
 bool kvm_s390_cpu_models_supported(void)
 {
     if (!cpu_model_allowed()) {
         /* compatibility machines interfere with the cpu model */
         return false;
     }
     return kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                              KVM_S390_VM_CPU_MACHINE) &&
            kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                              KVM_S390_VM_CPU_PROCESSOR) &&
            kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                              KVM_S390_VM_CPU_MACHINE_FEAT) &&
            kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                              KVM_S390_VM_CPU_PROCESSOR_FEAT) &&
            kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                              KVM_S390_VM_CPU_MACHINE_SUBFUNC);
 }
 
 void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
 {
     struct kvm_s390_vm_cpu_machine prop = {};
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_CPU_MODEL,
         .attr = KVM_S390_VM_CPU_MACHINE,
         .addr = (uint64_t) &prop,
     };
     uint16_t unblocked_ibc = 0, cpu_type = 0;
     int rc;
 
     memset(model, 0, sizeof(*model));
 
     if (!kvm_s390_cpu_models_supported()) {
         error_setg(errp, "KVM doesn't support CPU models");
         return;
     }
 
     /* query the basic cpu model properties */
     rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
     if (rc) {
         error_setg(errp, "KVM: Error querying host CPU model: %d", rc);
         return;
     }
 
     cpu_type = cpuid_type(prop.cpuid);
     if (has_ibc(prop.ibc)) {
         model->lowest_ibc = lowest_ibc(prop.ibc);
         unblocked_ibc = unblocked_ibc(prop.ibc);
     }
     model->cpu_id = cpuid_id(prop.cpuid);
     model->cpu_id_format = cpuid_format(prop.cpuid);
     model->cpu_ver = 0xff;
 
     /* get supported cpu features indicated via STFL(E) */
     s390_add_from_feat_block(model->features, S390_FEAT_TYPE_STFL,
                              (uint8_t *) prop.fac_mask);
     /* dat-enhancement facility 2 has no bit but was introduced with stfle */
     if (test_bit(S390_FEAT_STFLE, model->features)) {
         set_bit(S390_FEAT_DAT_ENH_2, model->features);
     }
     /* get supported cpu features indicated e.g. via SCLP */
     rc = query_cpu_feat(model->features);
     if (rc) {
         error_setg(errp, "KVM: Error querying CPU features: %d", rc);
         return;
     }
     /* get supported cpu subfunctions indicated via query / test bit */
     rc = query_cpu_subfunc(model->features);
     if (rc) {
         error_setg(errp, "KVM: Error querying CPU subfunctions: %d", rc);
         return;
     }
 
     /* PTFF subfunctions might be indicated although kernel support missing */
     if (!test_bit(S390_FEAT_MULTIPLE_EPOCH, model->features)) {
         clear_bit(S390_FEAT_PTFF_QSIE, model->features);
         clear_bit(S390_FEAT_PTFF_QTOUE, model->features);
         clear_bit(S390_FEAT_PTFF_STOE, model->features);
         clear_bit(S390_FEAT_PTFF_STOUE, model->features);
     }
 
     /* with cpu model support, CMM is only indicated if really available */
     if (kvm_s390_cmma_available()) {
         set_bit(S390_FEAT_CMM, model->features);
     } else {
         /* no cmm -> no cmm nt */
         clear_bit(S390_FEAT_CMM_NT, model->features);
     }
 
     /* bpb needs kernel support for migration, VSIE and reset */
     if (!kvm_check_extension(kvm_state, KVM_CAP_S390_BPB)) {
         clear_bit(S390_FEAT_BPB, model->features);
     }
 
     /*
      * If we have support for protected virtualization, indicate
      * the protected virtualization IPL unpack facility.
      */
     if (cap_protected) {
         set_bit(S390_FEAT_UNPACK, model->features);
     }
 
     /* We emulate a zPCI bus and AEN, therefore we don't need HW support */
     set_bit(S390_FEAT_ZPCI, model->features);
     set_bit(S390_FEAT_ADAPTER_EVENT_NOTIFICATION, model->features);
 
     if (s390_known_cpu_type(cpu_type)) {
         /* we want the exact model, even if some features are missing */
         model->def = s390_find_cpu_def(cpu_type, ibc_gen(unblocked_ibc),
                                        ibc_ec_ga(unblocked_ibc), NULL);
     } else {
         /* model unknown, e.g. too new - search using features */
         model->def = s390_find_cpu_def(0, ibc_gen(unblocked_ibc),
                                        ibc_ec_ga(unblocked_ibc),
                                        model->features);
     }
     if (!model->def) {
         error_setg(errp, "KVM: host CPU model could not be identified");
         return;
     }
     /* for now, we can only provide the AP feature with HW support */
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO,
         KVM_S390_VM_CRYPTO_ENABLE_APIE)) {
         set_bit(S390_FEAT_AP, model->features);
     }
 
     /*
      * Extended-Length SCCB is handled entirely within QEMU.
      * For PV guests this is completely fenced by the Ultravisor, as Service
      * Call error checking and STFLE interpretation are handled via SIE.
      */
     set_bit(S390_FEAT_EXTENDED_LENGTH_SCCB, model->features);
 
     if (kvm_check_extension(kvm_state, KVM_CAP_S390_DIAG318)) {
         set_bit(S390_FEAT_DIAG_318, model->features);
     }
 
     /* strip of features that are not part of the maximum model */
     bitmap_and(model->features, model->features, model->def->full_feat,
                S390_FEAT_MAX);
 }
 
 static void kvm_s390_configure_apie(bool interpret)
 {
     uint64_t attr = interpret ? KVM_S390_VM_CRYPTO_ENABLE_APIE :
                                 KVM_S390_VM_CRYPTO_DISABLE_APIE;
 
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
         kvm_s390_set_attr(attr);
     }
 }
 
 void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp)
 {
     struct kvm_s390_vm_cpu_processor prop  = {
         .fac_list = { 0 },
     };
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_CPU_MODEL,
         .attr = KVM_S390_VM_CPU_PROCESSOR,
         .addr = (uint64_t) &prop,
     };
     int rc;
 
     if (!model) {
         /* compatibility handling if cpu models are disabled */
         if (kvm_s390_cmma_available()) {
             kvm_s390_enable_cmma();
         }
         return;
     }
     if (!kvm_s390_cpu_models_supported()) {
         error_setg(errp, "KVM doesn't support CPU models");
         return;
     }
     prop.cpuid = s390_cpuid_from_cpu_model(model);
     prop.ibc = s390_ibc_from_cpu_model(model);
     /* configure cpu features indicated via STFL(e) */
     s390_fill_feat_block(model->features, S390_FEAT_TYPE_STFL,
                          (uint8_t *) prop.fac_list);
     rc = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
     if (rc) {
         error_setg(errp, "KVM: Error configuring the CPU model: %d", rc);
         return;
     }
     /* configure cpu features indicated e.g. via SCLP */
     rc = configure_cpu_feat(model->features);
     if (rc) {
         error_setg(errp, "KVM: Error configuring CPU features: %d", rc);
         return;
     }
     /* configure cpu subfunctions indicated via query / test bit */
     rc = configure_cpu_subfunc(model->features);
     if (rc) {
         error_setg(errp, "KVM: Error configuring CPU subfunctions: %d", rc);
         return;
     }
     /* enable CMM via CMMA */
     if (test_bit(S390_FEAT_CMM, model->features)) {
         kvm_s390_enable_cmma();
     }
 
     if (test_bit(S390_FEAT_AP, model->features)) {
         kvm_s390_configure_apie(true);
     }
 }
 
 void kvm_s390_restart_interrupt(S390CPU *cpu)
 {
     struct kvm_s390_irq irq = {
         .type = KVM_S390_RESTART,
     };
 
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
 void kvm_s390_stop_interrupt(S390CPU *cpu)
 {
     struct kvm_s390_irq irq = {
         .type = KVM_S390_SIGP_STOP,
     };
 
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
 bool kvm_arch_cpu_check_are_resettable(void)
 {
     return true;
 }
 
 int kvm_s390_get_zpci_op(void)
 {
     return cap_zpci_op;
 }
 
 void kvm_arch_accel_class_init(ObjectClass *oc)
 {
 }