Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 2245 insertions, 0 deletions

diff --git a/qemu/target-s390x/kvm.c b/qemu/target-s390x/kvm.c
new file mode 100644
index 000000000..ae3a0affe
--- /dev/null
+++ b/qemu/target-s390x/kvm.c
@@ -0,0 +1,2245 @@
+/*
+ * QEMU S390x KVM implementation
+ *
+ * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
+ * Copyright IBM Corp. 2012
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * Contributions after 2012-10-29 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ *
+ * You should have received a copy of the GNU (Lesser) General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include <linux/kvm.h>
+#include <asm/ptrace.h>
+
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+#include "qemu/timer.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/kvm.h"
+#include "hw/hw.h"
+#include "cpu.h"
+#include "sysemu/device_tree.h"
+#include "qapi/qmp/qjson.h"
+#include "exec/gdbstub.h"
+#include "exec/address-spaces.h"
+#include "trace.h"
+#include "qapi-event.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"
+
+/* #define DEBUG_KVM */
+
+#ifdef DEBUG_KVM
+#define DPRINTF(fmt, ...) \
+    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+    do { } while (0)
+#endif
+
+#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_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_IO                         0x40
+
+#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 (sizeof(struct kvm_s390_irq) * \
+                           (max_cpus + NR_LOCAL_IRQS))
+
+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_s390_irq;
+
+static void *legacy_s390_alloc(size_t size, uint64_t *align);
+
+static int kvm_s390_query_mem_limit(KVMState *s, 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(s, KVM_GET_DEVICE_ATTR, &attr);
+}
+
+int kvm_s390_set_mem_limit(KVMState *s, 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(s, KVM_S390_VM_MEM_LIMIT_SIZE)) {
+        return 0;
+    }
+
+    rc = kvm_s390_query_mem_limit(s, hw_limit);
+    if (rc) {
+        return rc;
+    } else if (*hw_limit < new_limit) {
+        return -E2BIG;
+    }
+
+    return kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr);
+}
+
+void kvm_s390_clear_cmma_callback(void *opaque)
+{
+    int rc;
+    KVMState *s = opaque;
+    struct kvm_device_attr attr = {
+        .group = KVM_S390_VM_MEM_CTRL,
+        .attr = KVM_S390_VM_MEM_CLR_CMMA,
+    };
+
+    rc = kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr);
+    trace_kvm_clear_cmma(rc);
+}
+
+static void kvm_s390_enable_cmma(KVMState *s)
+{
+    int rc;
+    struct kvm_device_attr attr = {
+        .group = KVM_S390_VM_MEM_CTRL,
+        .attr = KVM_S390_VM_MEM_ENABLE_CMMA,
+    };
+
+    if (!kvm_vm_check_mem_attr(s, KVM_S390_VM_MEM_ENABLE_CMMA) ||
+        !kvm_vm_check_mem_attr(s, KVM_S390_VM_MEM_CLR_CMMA)) {
+        return;
+    }
+
+    rc = kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr);
+    if (!rc) {
+        qemu_register_reset(kvm_s390_clear_cmma_callback, s);
+    }
+    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);
+    }
+}
+
+static void kvm_s390_init_crypto(void)
+{
+    kvm_s390_init_aes_kw();
+    kvm_s390_init_dea_kw();
+}
+
+int kvm_arch_init(MachineState *ms, KVMState *s)
+{
+    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_s390_irq = kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ);
+
+    kvm_s390_enable_cmma(s);
+
+    if (!kvm_check_extension(s, KVM_CAP_S390_GMAP)
+        || !kvm_check_extension(s, KVM_CAP_S390_COW)) {
+        phys_mem_set_alloc(legacy_s390_alloc);
+    }
+
+    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);
+
+    return 0;
+}
+
+unsigned long kvm_arch_vcpu_id(CPUState *cpu)
+{
+    return cpu->cpu_index;
+}
+
+int kvm_arch_init_vcpu(CPUState *cs)
+{
+    S390CPU *cpu = S390_CPU(cs);
+    kvm_s390_set_cpu_state(cpu, cpu->env.cpu_state);
+    cpu->irqstate = g_malloc0(VCPU_IRQ_BUF_SIZE);
+    return 0;
+}
+
+void kvm_s390_reset_vcpu(S390CPU *cpu)
+{
+    CPUState *cs = CPU(cpu);
+
+    /* The initial 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, KVM_S390_INITIAL_RESET, NULL)) {
+        error_report("Initial CPU reset failed on CPU %i", cs->cpu_index);
+    }
+
+    kvm_s390_init_crypto();
+}
+
+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].ll;
+            cs->kvm_run->s.regs.vrs[i][1] = env->vregs[i][1].ll;
+        }
+        cs->kvm_run->s.regs.fpc = env->fpc;
+        cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_VRS;
+    } else {
+        /* Floating point */
+        for (i = 0; i < 16; i++) {
+            fpu.fprs[i] = get_freg(env, i)->ll;
+        }
+        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);
+    }
+
+    /* 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;
+        }
+    }
+
+    /* 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].ll = cs->kvm_run->s.regs.vrs[i][0];
+            env->vregs[i][1].ll = cs->kvm_run->s.regs.vrs[i][1];
+        }
+        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)->ll = 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);
+    }
+
+    /* 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;
+        }
+    }
+
+    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_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);
+}
+
+/**
+ * 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 transfered
+ * @is_write:  true = write, false = read
+ * Returns:    0 on success, non-zero if an exception or error occured
+ *
+ * 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,
+    };
+    int ret;
+
+    if (!cap_mem_op) {
+        return -ENOSYS;
+    }
+    if (!hostbuf) {
+        mem_op.flags |= KVM_S390_MEMOP_F_CHECK_ONLY;
+    }
+
+    ret = kvm_vcpu_ioctl(CPU(cpu), KVM_S390_MEM_OP, &mem_op);
+    if (ret < 0) {
+        error_printf("KVM_S390_MEM_OP failed: %s\n", strerror(-ret));
+    }
+    return ret;
+}
+
+/*
+ * Legacy layout for s390:
+ * Older S390 KVM requires the topmost vma of the RAM to be
+ * smaller than an system defined value, which is at least 256GB.
+ * Larger systems have larger values. We put the guest between
+ * the end of data segment (system break) and this value. We
+ * use 32GB as a base to have enough room for the system break
+ * to grow. We also have to use MAP parameters that avoid
+ * read-only mapping of guest pages.
+ */
+static void *legacy_s390_alloc(size_t size, uint64_t *align)
+{
+    void *mem;
+
+    mem = mmap((void *) 0x800000000ULL, size,
+               PROT_EXEC|PROT_READ|PROT_WRITE,
+               MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
+    return mem == MAP_FAILED ? NULL : mem;
+}
+
+/* DIAG 501 is used for sw breakpoints */
+static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
+
+int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
+{
+
+    if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn,
+                            sizeof(diag_501), 0) ||
+        cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501,
+                            sizeof(diag_501), 1)) {
+        return -EINVAL;
+    }
+    return 0;
+}
+
+int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
+{
+    uint8_t t[sizeof(diag_501)];
+
+    if (cpu_memory_rw_debug(cs, bp->pc, t, sizeof(diag_501), 0)) {
+        return -EINVAL;
+    } else if (memcmp(t, diag_501, sizeof(diag_501))) {
+        return -EINVAL;
+    } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn,
+                                   sizeof(diag_501), 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 =
+             (struct kvm_hw_breakpoint *)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);
+}
+
+static void __kvm_s390_floating_interrupt(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_floating_interrupt(struct kvm_s390_irq *irq)
+{
+    static bool use_flic = true;
+    int r;
+
+    if (use_flic) {
+        r = kvm_s390_inject_flic(irq);
+        if (r == -ENOSYS) {
+            use_flic = false;
+        }
+        if (!r) {
+            return;
+        }
+    }
+    __kvm_s390_floating_interrupt(irq);
+}
+
+void kvm_s390_virtio_irq(int config_change, uint64_t token)
+{
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_INT_VIRTIO,
+        .u.ext.ext_params = config_change,
+        .u.ext.ext_params2 = token,
+    };
+
+    kvm_s390_floating_interrupt(&irq);
+}
+
+void kvm_s390_service_interrupt(uint32_t parm)
+{
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_INT_SERVICE,
+        .u.ext.ext_params = parm,
+    };
+
+    kvm_s390_floating_interrupt(&irq);
+}
+
+static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
+{
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_PROGRAM_INT,
+        .u.pgm.code = code,
+    };
+
+    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 int 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 = 0;
+
+    cpu_synchronize_state(CPU(cpu));
+    sccb = env->regs[ipbh0 & 0xf];
+    code = env->regs[(ipbh0 & 0xf0) >> 4];
+
+    r = sclp_service_call(env, sccb, code);
+    if (r < 0) {
+        enter_pgmcheck(cpu, -r);
+    } else {
+        setcc(cpu, r);
+    }
+
+    return 0;
+}
+
+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;
+
+    cpu_synchronize_state(CPU(cpu));
+
+    switch (ipa1) {
+    case PRIV_B2_XSCH:
+        ioinst_handle_xsch(cpu, env->regs[1]);
+        break;
+    case PRIV_B2_CSCH:
+        ioinst_handle_csch(cpu, env->regs[1]);
+        break;
+    case PRIV_B2_HSCH:
+        ioinst_handle_hsch(cpu, env->regs[1]);
+        break;
+    case PRIV_B2_MSCH:
+        ioinst_handle_msch(cpu, env->regs[1], run->s390_sieic.ipb);
+        break;
+    case PRIV_B2_SSCH:
+        ioinst_handle_ssch(cpu, env->regs[1], run->s390_sieic.ipb);
+        break;
+    case PRIV_B2_STCRW:
+        ioinst_handle_stcrw(cpu, run->s390_sieic.ipb);
+        break;
+    case PRIV_B2_STSCH:
+        ioinst_handle_stsch(cpu, env->regs[1], run->s390_sieic.ipb);
+        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);
+        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);
+        break;
+    case PRIV_B2_RSCH:
+        ioinst_handle_rsch(cpu, env->regs[1]);
+        break;
+    case PRIV_B2_RCHP:
+        ioinst_handle_rchp(cpu, env->regs[1]);
+        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]);
+        break;
+    case PRIV_B2_SIGA:
+        /* Not provided, set CC = 3 for subchannel not operational */
+        setcc(cpu, 3);
+        break;
+    case PRIV_B2_SCLP_CALL:
+        rc = 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;
+
+    return clp_service_call(cpu, r2);
+}
+
+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;
+
+    return pcilg_service_call(cpu, r1, r2);
+}
+
+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;
+
+    return pcistg_service_call(cpu, r1, r2);
+}
+
+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;
+
+    cpu_synchronize_state(CPU(cpu));
+    fiba = get_base_disp_rxy(cpu, run, &ar);
+
+    return stpcifc_service_call(cpu, r1, fiba, ar);
+}
+
+static int kvm_sic_service_call(S390CPU *cpu, struct kvm_run *run)
+{
+    /* NOOP */
+    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;
+
+    return rpcit_service_call(cpu, r1, r2);
+}
+
+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;
+
+    cpu_synchronize_state(CPU(cpu));
+    gaddr = get_base_disp_rsy(cpu, run, &ar);
+
+    return pcistb_service_call(cpu, r1, r3, gaddr, ar);
+}
+
+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;
+
+    cpu_synchronize_state(CPU(cpu));
+    fiba = get_base_disp_rxy(cpu, run, &ar);
+
+    return mpcifc_service_call(cpu, r1, fiba, ar);
+}
+
+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;
+
+    cpu_synchronize_state(CPU(cpu));
+    ret = s390_virtio_hypercall(env);
+    if (ret == -EINVAL) {
+        enter_pgmcheck(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;
+
+    cpu_synchronize_state(CPU(cpu));
+    r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
+    r3 = run->s390_sieic.ipa & 0x000f;
+    rc = handle_diag_288(&cpu->env, r1, r3);
+    if (rc) {
+        enter_pgmcheck(cpu, PGM_SPECIFICATION);
+    }
+}
+
+static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
+{
+    uint64_t r1, r3;
+
+    cpu_synchronize_state(CPU(cpu));
+    r1 = (run->s390_sieic.ipa & 0x00f0) >> 4;
+    r3 = run->s390_sieic.ipa & 0x000f;
+    handle_diag_308(&cpu->env, r1, r3);
+}
+
+static int handle_sw_breakpoint(S390CPU *cpu, struct kvm_run *run)
+{
+    CPUS390XState *env = &cpu->env;
+    unsigned long pc;
+
+    cpu_synchronize_state(CPU(cpu));
+
+    pc = env->psw.addr - 4;
+    if (kvm_find_sw_breakpoint(CPU(cpu), pc)) {
+        env->psw.addr = pc;
+        return EXCP_DEBUG;
+    }
+
+    return -ENOENT;
+}
+
+#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_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);
+        enter_pgmcheck(cpu, PGM_SPECIFICATION);
+        break;
+    }
+
+    return r;
+}
+
+typedef struct SigpInfo {
+    S390CPU *cpu;
+    uint64_t param;
+    int cc;
+    uint64_t *status_reg;
+} SigpInfo;
+
+static void set_sigp_status(SigpInfo *si, uint64_t status)
+{
+    *si->status_reg &= 0xffffffff00000000ULL;
+    *si->status_reg |= status;
+    si->cc = SIGP_CC_STATUS_STORED;
+}
+
+static void sigp_start(void *arg)
+{
+    SigpInfo *si = arg;
+
+    if (s390_cpu_get_state(si->cpu) != CPU_STATE_STOPPED) {
+        si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+        return;
+    }
+
+    s390_cpu_set_state(CPU_STATE_OPERATING, si->cpu);
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static void sigp_stop(void *arg)
+{
+    SigpInfo *si = arg;
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_SIGP_STOP,
+    };
+
+    if (s390_cpu_get_state(si->cpu) != CPU_STATE_OPERATING) {
+        si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+        return;
+    }
+
+    /* disabled wait - sleeping in user space */
+    if (CPU(si->cpu)->halted) {
+        s390_cpu_set_state(CPU_STATE_STOPPED, si->cpu);
+    } else {
+        /* execute the stop function */
+        si->cpu->env.sigp_order = SIGP_STOP;
+        kvm_s390_vcpu_interrupt(si->cpu, &irq);
+    }
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+#define ADTL_SAVE_AREA_SIZE 1024
+static int kvm_s390_store_adtl_status(S390CPU *cpu, hwaddr addr)
+{
+    void *mem;
+    hwaddr len = ADTL_SAVE_AREA_SIZE;
+
+    mem = cpu_physical_memory_map(addr, &len, 1);
+    if (!mem) {
+        return -EFAULT;
+    }
+    if (len != ADTL_SAVE_AREA_SIZE) {
+        cpu_physical_memory_unmap(mem, len, 1, 0);
+        return -EFAULT;
+    }
+
+    memcpy(mem, &cpu->env.vregs, 512);
+
+    cpu_physical_memory_unmap(mem, len, 1, len);
+
+    return 0;
+}
+
+#define KVM_S390_STORE_STATUS_DEF_ADDR offsetof(LowCore, floating_pt_save_area)
+#define SAVE_AREA_SIZE 512
+static int kvm_s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
+{
+    static const uint8_t ar_id = 1;
+    uint64_t ckc = cpu->env.ckc >> 8;
+    void *mem;
+    int i;
+    hwaddr len = SAVE_AREA_SIZE;
+
+    mem = cpu_physical_memory_map(addr, &len, 1);
+    if (!mem) {
+        return -EFAULT;
+    }
+    if (len != SAVE_AREA_SIZE) {
+        cpu_physical_memory_unmap(mem, len, 1, 0);
+        return -EFAULT;
+    }
+
+    if (store_arch) {
+        cpu_physical_memory_write(offsetof(LowCore, ar_access_id), &ar_id, 1);
+    }
+    for (i = 0; i < 16; ++i) {
+        *((uint64 *)mem + i) = get_freg(&cpu->env, i)->ll;
+    }
+    memcpy(mem + 128, &cpu->env.regs, 128);
+    memcpy(mem + 256, &cpu->env.psw, 16);
+    memcpy(mem + 280, &cpu->env.psa, 4);
+    memcpy(mem + 284, &cpu->env.fpc, 4);
+    memcpy(mem + 292, &cpu->env.todpr, 4);
+    memcpy(mem + 296, &cpu->env.cputm, 8);
+    memcpy(mem + 304, &ckc, 8);
+    memcpy(mem + 320, &cpu->env.aregs, 64);
+    memcpy(mem + 384, &cpu->env.cregs, 128);
+
+    cpu_physical_memory_unmap(mem, len, 1, len);
+
+    return 0;
+}
+
+static void sigp_stop_and_store_status(void *arg)
+{
+    SigpInfo *si = arg;
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_SIGP_STOP,
+    };
+
+    /* disabled wait - sleeping in user space */
+    if (s390_cpu_get_state(si->cpu) == CPU_STATE_OPERATING &&
+        CPU(si->cpu)->halted) {
+        s390_cpu_set_state(CPU_STATE_STOPPED, si->cpu);
+    }
+
+    switch (s390_cpu_get_state(si->cpu)) {
+    case CPU_STATE_OPERATING:
+        si->cpu->env.sigp_order = SIGP_STOP_STORE_STATUS;
+        kvm_s390_vcpu_interrupt(si->cpu, &irq);
+        /* store will be performed when handling the stop intercept */
+        break;
+    case CPU_STATE_STOPPED:
+        /* already stopped, just store the status */
+        cpu_synchronize_state(CPU(si->cpu));
+        kvm_s390_store_status(si->cpu, KVM_S390_STORE_STATUS_DEF_ADDR, true);
+        break;
+    }
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static void sigp_store_status_at_address(void *arg)
+{
+    SigpInfo *si = arg;
+    uint32_t address = si->param & 0x7ffffe00u;
+
+    /* cpu has to be stopped */
+    if (s390_cpu_get_state(si->cpu) != CPU_STATE_STOPPED) {
+        set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
+        return;
+    }
+
+    cpu_synchronize_state(CPU(si->cpu));
+
+    if (kvm_s390_store_status(si->cpu, address, false)) {
+        set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
+        return;
+    }
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static void sigp_store_adtl_status(void *arg)
+{
+    SigpInfo *si = arg;
+
+    if (!kvm_check_extension(kvm_state, KVM_CAP_S390_VECTOR_REGISTERS)) {
+        set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
+        return;
+    }
+
+    /* cpu has to be stopped */
+    if (s390_cpu_get_state(si->cpu) != CPU_STATE_STOPPED) {
+        set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
+        return;
+    }
+
+    /* parameter must be aligned to 1024-byte boundary */
+    if (si->param & 0x3ff) {
+        set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
+        return;
+    }
+
+    cpu_synchronize_state(CPU(si->cpu));
+
+    if (kvm_s390_store_adtl_status(si->cpu, si->param)) {
+        set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
+        return;
+    }
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static void sigp_restart(void *arg)
+{
+    SigpInfo *si = arg;
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_RESTART,
+    };
+
+    switch (s390_cpu_get_state(si->cpu)) {
+    case CPU_STATE_STOPPED:
+        /* the restart irq has to be delivered prior to any other pending irq */
+        cpu_synchronize_state(CPU(si->cpu));
+        do_restart_interrupt(&si->cpu->env);
+        s390_cpu_set_state(CPU_STATE_OPERATING, si->cpu);
+        break;
+    case CPU_STATE_OPERATING:
+        kvm_s390_vcpu_interrupt(si->cpu, &irq);
+        break;
+    }
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+int kvm_s390_cpu_restart(S390CPU *cpu)
+{
+    SigpInfo si = {
+        .cpu = cpu,
+    };
+
+    run_on_cpu(CPU(cpu), sigp_restart, &si);
+    DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
+    return 0;
+}
+
+static void sigp_initial_cpu_reset(void *arg)
+{
+    SigpInfo *si = arg;
+    CPUState *cs = CPU(si->cpu);
+    S390CPUClass *scc = S390_CPU_GET_CLASS(si->cpu);
+
+    cpu_synchronize_state(cs);
+    scc->initial_cpu_reset(cs);
+    cpu_synchronize_post_reset(cs);
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static void sigp_cpu_reset(void *arg)
+{
+    SigpInfo *si = arg;
+    CPUState *cs = CPU(si->cpu);
+    S390CPUClass *scc = S390_CPU_GET_CLASS(si->cpu);
+
+    cpu_synchronize_state(cs);
+    scc->cpu_reset(cs);
+    cpu_synchronize_post_reset(cs);
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static void sigp_set_prefix(void *arg)
+{
+    SigpInfo *si = arg;
+    uint32_t addr = si->param & 0x7fffe000u;
+
+    cpu_synchronize_state(CPU(si->cpu));
+
+    if (!address_space_access_valid(&address_space_memory, addr,
+                                    sizeof(struct LowCore), false)) {
+        set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
+        return;
+    }
+
+    /* cpu has to be stopped */
+    if (s390_cpu_get_state(si->cpu) != CPU_STATE_STOPPED) {
+        set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
+        return;
+    }
+
+    si->cpu->env.psa = addr;
+    cpu_synchronize_post_init(CPU(si->cpu));
+    si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+static int handle_sigp_single_dst(S390CPU *dst_cpu, uint8_t order,
+                                  uint64_t param, uint64_t *status_reg)
+{
+    SigpInfo si = {
+        .cpu = dst_cpu,
+        .param = param,
+        .status_reg = status_reg,
+    };
+
+    /* cpu available? */
+    if (dst_cpu == NULL) {
+        return SIGP_CC_NOT_OPERATIONAL;
+    }
+
+    /* only resets can break pending orders */
+    if (dst_cpu->env.sigp_order != 0 &&
+        order != SIGP_CPU_RESET &&
+        order != SIGP_INITIAL_CPU_RESET) {
+        return SIGP_CC_BUSY;
+    }
+
+    switch (order) {
+    case SIGP_START:
+        run_on_cpu(CPU(dst_cpu), sigp_start, &si);
+        break;
+    case SIGP_STOP:
+        run_on_cpu(CPU(dst_cpu), sigp_stop, &si);
+        break;
+    case SIGP_RESTART:
+        run_on_cpu(CPU(dst_cpu), sigp_restart, &si);
+        break;
+    case SIGP_STOP_STORE_STATUS:
+        run_on_cpu(CPU(dst_cpu), sigp_stop_and_store_status, &si);
+        break;
+    case SIGP_STORE_STATUS_ADDR:
+        run_on_cpu(CPU(dst_cpu), sigp_store_status_at_address, &si);
+        break;
+    case SIGP_STORE_ADTL_STATUS:
+        run_on_cpu(CPU(dst_cpu), sigp_store_adtl_status, &si);
+        break;
+    case SIGP_SET_PREFIX:
+        run_on_cpu(CPU(dst_cpu), sigp_set_prefix, &si);
+        break;
+    case SIGP_INITIAL_CPU_RESET:
+        run_on_cpu(CPU(dst_cpu), sigp_initial_cpu_reset, &si);
+        break;
+    case SIGP_CPU_RESET:
+        run_on_cpu(CPU(dst_cpu), sigp_cpu_reset, &si);
+        break;
+    default:
+        DPRINTF("KVM: unknown SIGP: 0x%x\n", order);
+        set_sigp_status(&si, SIGP_STAT_INVALID_ORDER);
+    }
+
+    return si.cc;
+}
+
+static int sigp_set_architecture(S390CPU *cpu, uint32_t param,
+                                 uint64_t *status_reg)
+{
+    CPUState *cur_cs;
+    S390CPU *cur_cpu;
+
+    /* due to the BQL, we are the only active cpu */
+    CPU_FOREACH(cur_cs) {
+        cur_cpu = S390_CPU(cur_cs);
+        if (cur_cpu->env.sigp_order != 0) {
+            return SIGP_CC_BUSY;
+        }
+        cpu_synchronize_state(cur_cs);
+        /* all but the current one have to be stopped */
+        if (cur_cpu != cpu &&
+            s390_cpu_get_state(cur_cpu) != CPU_STATE_STOPPED) {
+            *status_reg &= 0xffffffff00000000ULL;
+            *status_reg |= SIGP_STAT_INCORRECT_STATE;
+            return SIGP_CC_STATUS_STORED;
+        }
+    }
+
+    switch (param & 0xff) {
+    case SIGP_MODE_ESA_S390:
+        /* not supported */
+        return SIGP_CC_NOT_OPERATIONAL;
+    case SIGP_MODE_Z_ARCH_TRANS_ALL_PSW:
+    case SIGP_MODE_Z_ARCH_TRANS_CUR_PSW:
+        CPU_FOREACH(cur_cs) {
+            cur_cpu = S390_CPU(cur_cs);
+            cur_cpu->env.pfault_token = -1UL;
+        }
+        break;
+    default:
+        *status_reg &= 0xffffffff00000000ULL;
+        *status_reg |= SIGP_STAT_INVALID_PARAMETER;
+        return SIGP_CC_STATUS_STORED;
+    }
+
+    return SIGP_CC_ORDER_CODE_ACCEPTED;
+}
+
+#define SIGP_ORDER_MASK 0x000000ff
+
+static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
+{
+    CPUS390XState *env = &cpu->env;
+    const uint8_t r1 = ipa1 >> 4;
+    const uint8_t r3 = ipa1 & 0x0f;
+    int ret;
+    uint8_t order;
+    uint64_t *status_reg;
+    uint64_t param;
+    S390CPU *dst_cpu = NULL;
+
+    cpu_synchronize_state(CPU(cpu));
+
+    /* get order code */
+    order = decode_basedisp_rs(env, run->s390_sieic.ipb, NULL)
+        & SIGP_ORDER_MASK;
+    status_reg = &env->regs[r1];
+    param = (r1 % 2) ? env->regs[r1] : env->regs[r1 + 1];
+
+    switch (order) {
+    case SIGP_SET_ARCH:
+        ret = sigp_set_architecture(cpu, param, status_reg);
+        break;
+    default:
+        /* all other sigp orders target a single vcpu */
+        dst_cpu = s390_cpu_addr2state(env->regs[r3]);
+        ret = handle_sigp_single_dst(dst_cpu, order, param, status_reg);
+    }
+
+    trace_kvm_sigp_finished(order, CPU(cpu)->cpu_index,
+                            dst_cpu ? CPU(dst_cpu)->cpu_index : -1, ret);
+
+    if (ret >= 0) {
+        setcc(cpu, ret);
+        return 0;
+    }
+
+    return ret;
+}
+
+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 = handle_sigp(cpu, run, ipa1);
+        break;
+    }
+
+    if (r < 0) {
+        r = 0;
+        enter_pgmcheck(cpu, 0x0001);
+    }
+
+    return r;
+}
+
+static bool is_special_wait_psw(CPUState *cs)
+{
+    /* signal quiesce */
+    return cs->kvm_run->psw_addr == 0xfffUL;
+}
+
+static void guest_panicked(void)
+{
+    qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE,
+                                   &error_abort);
+    vm_stop(RUN_STATE_GUEST_PANICKED);
+}
+
+static void unmanageable_intercept(S390CPU *cpu, const char *str, int pswoffset)
+{
+    CPUState *cs = CPU(cpu);
+
+    error_report("Unmanageable %s! CPU%i new PSW: 0x%016lx:%016lx",
+                 str, cs->cpu_index, ldq_phys(cs->as, cpu->env.psa + pswoffset),
+                 ldq_phys(cs->as, cpu->env.psa + pswoffset + 8));
+    s390_cpu_halt(cpu);
+    guest_panicked();
+}
+
+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)cs->kvm_run->psw_addr);
+    switch (icpt_code) {
+        case ICPT_INSTRUCTION:
+            r = handle_instruction(cpu, run);
+            break;
+        case ICPT_PROGRAM:
+            unmanageable_intercept(cpu, "program interrupt",
+                                   offsetof(LowCore, program_new_psw));
+            r = EXCP_HALTED;
+            break;
+        case ICPT_EXT_INT:
+            unmanageable_intercept(cpu, "external interrupt",
+                                   offsetof(LowCore, external_new_psw));
+            r = EXCP_HALTED;
+            break;
+        case ICPT_WAITPSW:
+            /* disabled wait, since enabled wait is handled in kernel */
+            cpu_synchronize_state(cs);
+            if (s390_cpu_halt(cpu) == 0) {
+                if (is_special_wait_psw(cs)) {
+                    qemu_system_shutdown_request();
+                } else {
+                    guest_panicked();
+                }
+            }
+            r = EXCP_HALTED;
+            break;
+        case ICPT_CPU_STOP:
+            if (s390_cpu_set_state(CPU_STATE_STOPPED, cpu) == 0) {
+                qemu_system_shutdown_request();
+            }
+            if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
+                kvm_s390_store_status(cpu, KVM_S390_STORE_STATUS_DEF_ADDR,
+                                      true);
+            }
+            cpu->env.sigp_order = 0;
+            r = EXCP_HALTED;
+            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;
+
+    cpu_synchronize_state(cs);
+
+    ret = ioinst_handle_tsch(cpu, cpu->env.regs[1], run->s390_tsch.ipb);
+    if (ret < 0) {
+        /*
+         * Failure.
+         * If an I/O interrupt had been dequeued, we have to reinject it.
+         */
+        if (run->s390_tsch.dequeued) {
+            kvm_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)
+{
+    struct sysib_322 sysib;
+    int del;
+
+    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));
+    }
+    /* 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 */
+    memset(sysib.ext_names[0], 0, sizeof(sysib.ext_names[0]));
+    /* 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.
+     */
+    if (qemu_name) {
+        strncpy((char *)sysib.ext_names[0], qemu_name,
+                sizeof(sysib.ext_names[0]));
+    } else {
+        strcpy((char *)sysib.ext_names[0], "KVMguest");
+    }
+    /* Insert UUID */
+    memcpy(sysib.vm[0].uuid, qemu_uuid, sizeof(sysib.vm[0].uuid));
+
+    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();
+
+    switch (run->exit_reason) {
+        case KVM_EXIT_S390_SIEIC:
+            ret = handle_intercept(cpu);
+            break;
+        case KVM_EXIT_S390_RESET:
+            s390_reipl_request();
+            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;
+}
+
+int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
+{
+    return 1;
+}
+
+int kvm_arch_on_sigbus(int code, void *addr)
+{
+    return 1;
+}
+
+void kvm_s390_io_interrupt(uint16_t subchannel_id,
+                           uint16_t subchannel_nr, uint32_t io_int_parm,
+                           uint32_t io_int_word)
+{
+    struct kvm_s390_irq irq = {
+        .u.io.subchannel_id = subchannel_id,
+        .u.io.subchannel_nr = subchannel_nr,
+        .u.io.io_int_parm = io_int_parm,
+        .u.io.io_int_word = io_int_word,
+    };
+
+    if (io_int_word & IO_INT_WORD_AI) {
+        irq.type = KVM_S390_INT_IO(1, 0, 0, 0);
+    } else {
+        irq.type = ((subchannel_id & 0xff00) << 24) |
+            ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
+    }
+    kvm_s390_floating_interrupt(&irq);
+}
+
+void kvm_s390_crw_mchk(void)
+{
+    struct kvm_s390_irq irq = {
+        .type = KVM_S390_MCHK,
+        .u.mchk.cr14 = 1 << 28,
+        .u.mchk.mcic = 0x00400f1d40330000ULL,
+    };
+    kvm_s390_floating_interrupt(&irq);
+}
+
+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,
+    };
+    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_memslot_count(KVMState *s)
+{
+    return kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
+}
+
+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 CPU_STATE_STOPPED:
+        mp_state.mp_state = KVM_MP_STATE_STOPPED;
+        break;
+    case CPU_STATE_CHECK_STOP:
+        mp_state.mp_state = KVM_MP_STATE_CHECK_STOP;
+        break;
+    case CPU_STATE_OPERATING:
+        mp_state.mp_state = KVM_MP_STATE_OPERATING;
+        break;
+    case 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)
+{
+    struct kvm_s390_irq_state irq_state;
+    CPUState *cs = CPU(cpu);
+    int32_t bytes;
+
+    if (!kvm_check_extension(kvm_state, KVM_CAP_S390_IRQ_STATE)) {
+        return;
+    }
+
+    irq_state.buf = (uint64_t) cpu->irqstate;
+    irq_state.len = VCPU_IRQ_BUF_SIZE;
+
+    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;
+    int r;
+
+    if (cpu->irqstate_saved_size == 0) {
+        return 0;
+    }
+
+    if (!kvm_check_extension(kvm_state, KVM_CAP_S390_IRQ_STATE)) {
+        return -ENOSYS;
+    }
+
+    irq_state.buf = (uint64_t) cpu->irqstate;
+    irq_state.len = cpu->irqstate_saved_size;
+
+    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)
+{
+    S390PCIBusDevice *pbdev;
+    uint32_t fid = data >> ZPCI_MSI_VEC_BITS;
+    uint32_t vec = data & ZPCI_MSI_VEC_MASK;
+
+    pbdev = s390_pci_find_dev_by_fid(fid);
+    if (!pbdev) {
+        DPRINTF("add_msi_route no dev\n");
+        return -ENODEV;
+    }
+
+    pbdev->routes.adapter.ind_offset = vec;
+
+    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;
+    route->u.adapter.adapter_id = pbdev->routes.adapter.adapter_id;
+    return 0;
+}
+
+int kvm_arch_msi_data_to_gsi(uint32_t data)
+{
+    abort();
+}