Add a CPU reset handler to have all CPUs in a PoP compliant state. Signed-off-by: Jens Freimann <jf...@linux.vnet.ibm.com> --- v3 -> v4: * don't set psw_mask to z/Architecture in cpu_reset as it is done by the ipl device code later on * make sure patch compiles and runs with s390x-linux-user (simple test by running busybox on x86)
v2 -> v3: * remove FIXME * separate parent reset from local reset by adding a white line * use defines for register reset values v1 -> v2: * move setting of control registers and psa to s390_cpu_reset and call it from the new s390_machine_cpu_reset_cb() This makes it more similar to how it is done on x86 * in s390_cpu_reset() set env->halted state of cpu after the memset. This is needed to keep our s390_cpu_running counter in sync when s390_cpu_reset is called via the qemu_devices_reset path * set env->halted state in s390_cpu_initfn to 1 to avoid decrementing the cpu counter during first reset --- target-s390x/cpu.c | 34 ++++++++++++++++++++++++++++++++-- target-s390x/kvm.c | 9 ++++++++- 2 files changed, 40 insertions(+), 3 deletions(-) diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c index 249f063..d1abb54 100644 --- a/target-s390x/cpu.c +++ b/target-s390x/cpu.c @@ -4,6 +4,7 @@ * Copyright (c) 2009 Ulrich Hecht * Copyright (c) 2011 Alexander Graf * Copyright (c) 2012 SUSE LINUX Products GmbH + * Copyright (c) 2012 IBM Corp. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -18,12 +19,17 @@ * 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/lgpl-2.1.html> + * Contributions after 2012-12-11 are licensed under the terms of the + * GNU GPL, version 2 or (at your option) any later version. */ #include "cpu.h" +#include "hw/hw.h" #include "qemu-common.h" #include "qemu/timer.h" +#define CR0_RESET 0xE0UL +#define CR14_RESET 0xC2000000UL; /* CPUClass::reset() */ static void s390_cpu_reset(CPUState *s) @@ -37,14 +43,33 @@ static void s390_cpu_reset(CPUState *s) log_cpu_state(env, 0); } + s390_del_running_cpu(env); + scc->parent_reset(s); memset(env, 0, offsetof(CPUS390XState, breakpoints)); - /* FIXME: reset vector? */ + + /* architectured initial values for CR 0 and 14 */ + env->cregs[0] = CR0_RESET; + env->cregs[14] = CR14_RESET; + /* set halted to 1 to make sure we can add the cpu in + * s390_ipl_cpu code, where env->halted is set back to 0 + * after incrementing the cpu counter */ +#if !defined(CONFIG_USER_ONLY) + env->halted = 1; +#endif tlb_flush(env, 1); - s390_add_running_cpu(env); } +#if !defined(CONFIG_USER_ONLY) +static void s390_cpu_machine_reset_cb(void *opaque) +{ + S390CPU *cpu = opaque; + + cpu_reset(CPU(cpu)); +} +#endif + static void s390_cpu_initfn(Object *obj) { S390CPU *cpu = S390_CPU(obj); @@ -56,12 +81,17 @@ static void s390_cpu_initfn(Object *obj) cpu_exec_init(env); #if !defined(CONFIG_USER_ONLY) + qemu_register_reset(s390_cpu_machine_reset_cb, cpu); qemu_get_timedate(&tm, 0); env->tod_offset = TOD_UNIX_EPOCH + (time2tod(mktimegm(&tm)) * 1000000000ULL); env->tod_basetime = 0; env->tod_timer = qemu_new_timer_ns(vm_clock, s390x_tod_timer, cpu); env->cpu_timer = qemu_new_timer_ns(vm_clock, s390x_cpu_timer, cpu); + /* set env->halted state to 1 to avoid decrementing the running + * cpu counter in s390_cpu_reset to a negative number at + * initial ipl */ + env->halted = 1; #endif env->cpu_num = cpu_num++; env->ext_index = -1; diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c index 6ec5e6d..f116a43 100644 --- a/target-s390x/kvm.c +++ b/target-s390x/kvm.c @@ -85,7 +85,14 @@ int kvm_arch_init_vcpu(CPUState *cpu) void kvm_arch_reset_vcpu(CPUState *cpu) { - /* FIXME: add code to reset vcpu. */ + /* 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(cpu, KVM_S390_INITIAL_RESET, NULL)) { + perror("Can't reset vcpu\n"); + } } int kvm_arch_put_registers(CPUState *cs, int level) -- 1.7.12.4
