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/*
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* QEMU S390x KVM implementation
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*
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* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <linux/kvm.h> |
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#include <asm/ptrace.h> |
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#include "qemu-common.h" |
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#include "qemu/timer.h" |
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#include "sysemu/sysemu.h" |
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#include "sysemu/kvm.h" |
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#include "cpu.h" |
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#include "sysemu/device_tree.h" |
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/* #define DEBUG_KVM */
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#ifdef DEBUG_KVM
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define dprintf(fmt, ...) \
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do { } while (0) |
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#endif
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#define IPA0_DIAG 0x8300 |
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#define IPA0_SIGP 0xae00 |
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#define IPA0_PRIV 0xb200 |
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#define PRIV_SCLP_CALL 0x20 |
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#define DIAG_KVM_HYPERCALL 0x500 |
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#define DIAG_KVM_BREAKPOINT 0x501 |
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#define ICPT_INSTRUCTION 0x04 |
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#define ICPT_WAITPSW 0x1c |
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#define ICPT_SOFT_INTERCEPT 0x24 |
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#define ICPT_CPU_STOP 0x28 |
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#define ICPT_IO 0x40 |
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#define SIGP_RESTART 0x06 |
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#define SIGP_INITIAL_CPU_RESET 0x0b |
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#define SIGP_STORE_STATUS_ADDR 0x0e |
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#define SIGP_SET_ARCH 0x12 |
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const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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KVM_CAP_LAST_INFO |
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}; |
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static int cap_sync_regs; |
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int kvm_arch_init(KVMState *s)
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{ |
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cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS); |
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return 0; |
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} |
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int kvm_arch_init_vcpu(CPUS390XState *env)
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{ |
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int ret = 0; |
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if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) { |
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perror("cannot init reset vcpu");
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} |
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return ret;
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} |
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void kvm_arch_reset_vcpu(CPUS390XState *env)
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{ |
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/* FIXME: add code to reset vcpu. */
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} |
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int kvm_arch_put_registers(CPUS390XState *env, int level) |
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{ |
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struct kvm_sregs sregs;
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struct kvm_regs regs;
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int ret;
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int i;
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/* always save the PSW and the GPRS*/
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env->kvm_run->psw_addr = env->psw.addr; |
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env->kvm_run->psw_mask = env->psw.mask; |
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if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
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for (i = 0; i < 16; i++) { |
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env->kvm_run->s.regs.gprs[i] = env->regs[i]; |
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env->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS; |
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} |
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} else {
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for (i = 0; i < 16; i++) { |
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regs.gprs[i] = env->regs[i]; |
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} |
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ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, ®s); |
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if (ret < 0) { |
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return ret;
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} |
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} |
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/* Do we need to save more than that? */
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if (level == KVM_PUT_RUNTIME_STATE) {
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return 0; |
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} |
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if (cap_sync_regs &&
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env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS && |
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env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) { |
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for (i = 0; i < 16; i++) { |
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env->kvm_run->s.regs.acrs[i] = env->aregs[i]; |
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env->kvm_run->s.regs.crs[i] = env->cregs[i]; |
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} |
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env->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS; |
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env->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS; |
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} else {
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for (i = 0; i < 16; i++) { |
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sregs.acrs[i] = env->aregs[i]; |
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sregs.crs[i] = env->cregs[i]; |
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} |
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ret = kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs); |
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if (ret < 0) { |
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return ret;
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} |
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} |
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/* Finally the prefix */
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if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
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env->kvm_run->s.regs.prefix = env->psa; |
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env->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX; |
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} else {
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/* prefix is only supported via sync regs */
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} |
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return 0; |
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} |
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int kvm_arch_get_registers(CPUS390XState *env)
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{ |
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struct kvm_sregs sregs;
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struct kvm_regs regs;
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int ret;
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int i;
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/* get the PSW */
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env->psw.addr = env->kvm_run->psw_addr; |
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env->psw.mask = env->kvm_run->psw_mask; |
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/* the GPRS */
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if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
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for (i = 0; i < 16; i++) { |
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env->regs[i] = env->kvm_run->s.regs.gprs[i]; |
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} |
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} else {
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ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, ®s); |
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if (ret < 0) { |
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return ret;
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} |
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for (i = 0; i < 16; i++) { |
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env->regs[i] = regs.gprs[i]; |
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} |
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} |
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/* The ACRS and CRS */
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if (cap_sync_regs &&
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env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS && |
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env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) { |
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for (i = 0; i < 16; i++) { |
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env->aregs[i] = env->kvm_run->s.regs.acrs[i]; |
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env->cregs[i] = env->kvm_run->s.regs.crs[i]; |
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} |
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} else {
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ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs); |
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if (ret < 0) { |
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return ret;
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} |
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for (i = 0; i < 16; i++) { |
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env->aregs[i] = sregs.acrs[i]; |
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env->cregs[i] = sregs.crs[i]; |
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} |
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} |
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/* Finally the prefix */
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if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
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env->psa = env->kvm_run->s.regs.prefix; |
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} else {
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/* no prefix without sync regs */
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} |
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return 0; |
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} |
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/*
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* Legacy layout for s390:
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* Older S390 KVM requires the topmost vma of the RAM to be
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* smaller than an system defined value, which is at least 256GB.
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* Larger systems have larger values. We put the guest between
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* the end of data segment (system break) and this value. We
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* use 32GB as a base to have enough room for the system break
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* to grow. We also have to use MAP parameters that avoid
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* read-only mapping of guest pages.
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*/
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static void *legacy_s390_alloc(ram_addr_t size) |
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{ |
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void *mem;
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mem = mmap((void *) 0x800000000ULL, size, |
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PROT_EXEC|PROT_READ|PROT_WRITE, |
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MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0); |
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if (mem == MAP_FAILED) {
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fprintf(stderr, "Allocating RAM failed\n");
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abort(); |
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} |
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return mem;
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} |
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void *kvm_arch_vmalloc(ram_addr_t size)
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{ |
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/* Can we use the standard allocation ? */
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if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
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kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) { |
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return NULL; |
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} else {
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return legacy_s390_alloc(size);
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} |
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} |
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int kvm_arch_insert_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp) |
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{ |
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static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01}; |
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if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) || |
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cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) { |
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return -EINVAL;
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} |
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return 0; |
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} |
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int kvm_arch_remove_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp) |
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{ |
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uint8_t t[4];
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static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01}; |
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if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) { |
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return -EINVAL;
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} else if (memcmp(t, diag_501, 4)) { |
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return -EINVAL;
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} else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) { |
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return -EINVAL;
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} |
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return 0; |
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} |
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void kvm_arch_pre_run(CPUS390XState *env, struct kvm_run *run) |
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{ |
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} |
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void kvm_arch_post_run(CPUS390XState *env, struct kvm_run *run) |
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{ |
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} |
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int kvm_arch_process_async_events(CPUS390XState *env)
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{ |
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return env->halted;
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} |
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void kvm_s390_interrupt_internal(CPUS390XState *env, int type, uint32_t parm, |
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uint64_t parm64, int vm)
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{ |
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struct kvm_s390_interrupt kvmint;
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int r;
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if (!env->kvm_state) {
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return;
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} |
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kvmint.type = type; |
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kvmint.parm = parm; |
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kvmint.parm64 = parm64; |
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if (vm) {
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r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint); |
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} else {
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r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint); |
300 |
} |
301 |
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if (r < 0) { |
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fprintf(stderr, "KVM failed to inject interrupt\n");
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exit(1);
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} |
306 |
} |
307 |
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void kvm_s390_virtio_irq(CPUS390XState *env, int config_change, uint64_t token) |
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{ |
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kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change, |
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token, 1);
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} |
313 |
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void kvm_s390_interrupt(CPUS390XState *env, int type, uint32_t code) |
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{ |
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kvm_s390_interrupt_internal(env, type, code, 0, 0); |
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} |
318 |
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static void enter_pgmcheck(CPUS390XState *env, uint16_t code) |
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{ |
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kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code); |
322 |
} |
323 |
|
324 |
static inline void setcc(CPUS390XState *env, uint64_t cc) |
325 |
{ |
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env->kvm_run->psw_mask &= ~(3ull << 44); |
327 |
env->kvm_run->psw_mask |= (cc & 3) << 44; |
328 |
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env->psw.mask &= ~(3ul << 44); |
330 |
env->psw.mask |= (cc & 3) << 44; |
331 |
} |
332 |
|
333 |
static int kvm_sclp_service_call(CPUS390XState *env, struct kvm_run *run, |
334 |
uint16_t ipbh0) |
335 |
{ |
336 |
uint32_t sccb; |
337 |
uint64_t code; |
338 |
int r = 0; |
339 |
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340 |
cpu_synchronize_state(env); |
341 |
sccb = env->regs[ipbh0 & 0xf];
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code = env->regs[(ipbh0 & 0xf0) >> 4]; |
343 |
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344 |
r = sclp_service_call(sccb, code); |
345 |
if (r < 0) { |
346 |
enter_pgmcheck(env, -r); |
347 |
} |
348 |
setcc(env, r); |
349 |
|
350 |
return 0; |
351 |
} |
352 |
|
353 |
static int handle_priv(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1) |
354 |
{ |
355 |
int r = 0; |
356 |
uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16; |
357 |
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358 |
dprintf("KVM: PRIV: %d\n", ipa1);
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359 |
switch (ipa1) {
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360 |
case PRIV_SCLP_CALL:
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361 |
r = kvm_sclp_service_call(env, run, ipbh0); |
362 |
break;
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363 |
default:
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364 |
dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
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365 |
r = -1;
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break;
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367 |
} |
368 |
|
369 |
return r;
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370 |
} |
371 |
|
372 |
static int handle_hypercall(CPUS390XState *env, struct kvm_run *run) |
373 |
{ |
374 |
cpu_synchronize_state(env); |
375 |
env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]); |
376 |
|
377 |
return 0; |
378 |
} |
379 |
|
380 |
static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code) |
381 |
{ |
382 |
int r = 0; |
383 |
|
384 |
switch (ipb_code) {
|
385 |
case DIAG_KVM_HYPERCALL:
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386 |
r = handle_hypercall(env, run); |
387 |
break;
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388 |
case DIAG_KVM_BREAKPOINT:
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389 |
sleep(10);
|
390 |
break;
|
391 |
default:
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392 |
dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
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393 |
r = -1;
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394 |
break;
|
395 |
} |
396 |
|
397 |
return r;
|
398 |
} |
399 |
|
400 |
static int s390_cpu_restart(S390CPU *cpu) |
401 |
{ |
402 |
CPUS390XState *env = &cpu->env; |
403 |
|
404 |
kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
|
405 |
s390_add_running_cpu(env); |
406 |
qemu_cpu_kick(CPU(cpu)); |
407 |
dprintf("DONE: SIGP cpu restart: %p\n", env);
|
408 |
return 0; |
409 |
} |
410 |
|
411 |
static int s390_store_status(CPUS390XState *env, uint32_t parameter) |
412 |
{ |
413 |
/* XXX */
|
414 |
fprintf(stderr, "XXX SIGP store status\n");
|
415 |
return -1; |
416 |
} |
417 |
|
418 |
static int s390_cpu_initial_reset(CPUS390XState *env) |
419 |
{ |
420 |
int i;
|
421 |
|
422 |
s390_del_running_cpu(env); |
423 |
if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) { |
424 |
perror("cannot init reset vcpu");
|
425 |
} |
426 |
|
427 |
/* Manually zero out all registers */
|
428 |
cpu_synchronize_state(env); |
429 |
for (i = 0; i < 16; i++) { |
430 |
env->regs[i] = 0;
|
431 |
} |
432 |
|
433 |
dprintf("DONE: SIGP initial reset: %p\n", env);
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434 |
return 0; |
435 |
} |
436 |
|
437 |
static int handle_sigp(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1) |
438 |
{ |
439 |
uint8_t order_code; |
440 |
uint32_t parameter; |
441 |
uint16_t cpu_addr; |
442 |
uint8_t t; |
443 |
int r = -1; |
444 |
S390CPU *target_cpu; |
445 |
CPUS390XState *target_env; |
446 |
|
447 |
cpu_synchronize_state(env); |
448 |
|
449 |
/* get order code */
|
450 |
order_code = run->s390_sieic.ipb >> 28;
|
451 |
if (order_code > 0) { |
452 |
order_code = env->regs[order_code]; |
453 |
} |
454 |
order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16; |
455 |
|
456 |
/* get parameters */
|
457 |
t = (ipa1 & 0xf0) >> 4; |
458 |
if (!(t % 2)) { |
459 |
t++; |
460 |
} |
461 |
|
462 |
parameter = env->regs[t] & 0x7ffffe00;
|
463 |
cpu_addr = env->regs[ipa1 & 0x0f];
|
464 |
|
465 |
target_cpu = s390_cpu_addr2state(cpu_addr); |
466 |
if (target_cpu == NULL) { |
467 |
goto out;
|
468 |
} |
469 |
target_env = &target_cpu->env; |
470 |
|
471 |
switch (order_code) {
|
472 |
case SIGP_RESTART:
|
473 |
r = s390_cpu_restart(target_cpu); |
474 |
break;
|
475 |
case SIGP_STORE_STATUS_ADDR:
|
476 |
r = s390_store_status(target_env, parameter); |
477 |
break;
|
478 |
case SIGP_SET_ARCH:
|
479 |
/* make the caller panic */
|
480 |
return -1; |
481 |
case SIGP_INITIAL_CPU_RESET:
|
482 |
r = s390_cpu_initial_reset(target_env); |
483 |
break;
|
484 |
default:
|
485 |
fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
|
486 |
break;
|
487 |
} |
488 |
|
489 |
out:
|
490 |
setcc(env, r ? 3 : 0); |
491 |
return 0; |
492 |
} |
493 |
|
494 |
static int handle_instruction(CPUS390XState *env, struct kvm_run *run) |
495 |
{ |
496 |
unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00); |
497 |
uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
|
498 |
int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16; |
499 |
int r = -1; |
500 |
|
501 |
dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
|
502 |
switch (ipa0) {
|
503 |
case IPA0_PRIV:
|
504 |
r = handle_priv(env, run, ipa1); |
505 |
break;
|
506 |
case IPA0_DIAG:
|
507 |
r = handle_diag(env, run, ipb_code); |
508 |
break;
|
509 |
case IPA0_SIGP:
|
510 |
r = handle_sigp(env, run, ipa1); |
511 |
break;
|
512 |
} |
513 |
|
514 |
if (r < 0) { |
515 |
enter_pgmcheck(env, 0x0001);
|
516 |
} |
517 |
return 0; |
518 |
} |
519 |
|
520 |
static bool is_special_wait_psw(CPUS390XState *env) |
521 |
{ |
522 |
/* signal quiesce */
|
523 |
return env->kvm_run->psw_addr == 0xfffUL; |
524 |
} |
525 |
|
526 |
static int handle_intercept(CPUS390XState *env) |
527 |
{ |
528 |
struct kvm_run *run = env->kvm_run;
|
529 |
int icpt_code = run->s390_sieic.icptcode;
|
530 |
int r = 0; |
531 |
|
532 |
dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
|
533 |
(long)env->kvm_run->psw_addr);
|
534 |
switch (icpt_code) {
|
535 |
case ICPT_INSTRUCTION:
|
536 |
r = handle_instruction(env, run); |
537 |
break;
|
538 |
case ICPT_WAITPSW:
|
539 |
if (s390_del_running_cpu(env) == 0 && |
540 |
is_special_wait_psw(env)) { |
541 |
qemu_system_shutdown_request(); |
542 |
} |
543 |
r = EXCP_HALTED; |
544 |
break;
|
545 |
case ICPT_CPU_STOP:
|
546 |
if (s390_del_running_cpu(env) == 0) { |
547 |
qemu_system_shutdown_request(); |
548 |
} |
549 |
r = EXCP_HALTED; |
550 |
break;
|
551 |
case ICPT_SOFT_INTERCEPT:
|
552 |
fprintf(stderr, "KVM unimplemented icpt SOFT\n");
|
553 |
exit(1);
|
554 |
break;
|
555 |
case ICPT_IO:
|
556 |
fprintf(stderr, "KVM unimplemented icpt IO\n");
|
557 |
exit(1);
|
558 |
break;
|
559 |
default:
|
560 |
fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
|
561 |
exit(1);
|
562 |
break;
|
563 |
} |
564 |
|
565 |
return r;
|
566 |
} |
567 |
|
568 |
int kvm_arch_handle_exit(CPUS390XState *env, struct kvm_run *run) |
569 |
{ |
570 |
int ret = 0; |
571 |
|
572 |
switch (run->exit_reason) {
|
573 |
case KVM_EXIT_S390_SIEIC:
|
574 |
ret = handle_intercept(env); |
575 |
break;
|
576 |
case KVM_EXIT_S390_RESET:
|
577 |
qemu_system_reset_request(); |
578 |
break;
|
579 |
default:
|
580 |
fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
|
581 |
break;
|
582 |
} |
583 |
|
584 |
if (ret == 0) { |
585 |
ret = EXCP_INTERRUPT; |
586 |
} |
587 |
return ret;
|
588 |
} |
589 |
|
590 |
bool kvm_arch_stop_on_emulation_error(CPUS390XState *env)
|
591 |
{ |
592 |
return true; |
593 |
} |
594 |
|
595 |
int kvm_arch_on_sigbus_vcpu(CPUS390XState *env, int code, void *addr) |
596 |
{ |
597 |
return 1; |
598 |
} |
599 |
|
600 |
int kvm_arch_on_sigbus(int code, void *addr) |
601 |
{ |
602 |
return 1; |
603 |
} |