[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 2/3] s390: Add CPU reset handler
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [PATCH 2/3] s390: Add CPU reset handler |
Date: |
Thu, 3 Jan 2013 13:55:19 +0100 |
On 18.12.2012, at 18:50, Jens Freimann wrote:
> Add a CPU reset handler to have all CPUs in a PoP compliant
> state.
>
> Signed-off-by: Jens Freimann <address@hidden>
>
> ---
> v2 -> v3:
> * remove FIXME
> * separate parent reset from local reset by adding a while 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 | 35 +++++++++++++++++++++++++++++++++--
> target-s390x/kvm.c | 9 ++++++++-
> 2 files changed, 41 insertions(+), 3 deletions(-)
>
> diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
> index 619b202..58e412a 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 +19,19 @@
> * 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"
Also, have you verified that this doesn't break s390x-linux-user?
> #include "qemu-common.h"
> #include "qemu-timer.h"
>
> +#define IPL_PSW_MASK 0x0000000180000000ULL
> +#define CR0_RESET 0xE0UL
> +#define CR14_RESET 0xC2000000UL;
>
> /* CPUClass::reset() */
> static void s390_cpu_reset(CPUState *s)
> @@ -37,12 +45,30 @@ 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 to z/Architecture mode */
> + env->psw.mask = IPL_PSW_MASK;
In fact this one is correct for CONFIG_USER_ONLY.
> + env->psa = 0;
> + /* 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 */
> + env->halted = 1;
While this again probably breaks s390x-linux-user, no?
Alex
> tlb_flush(env, 1);
> - s390_add_running_cpu(env);
> +}
> +
> +static void s390_cpu_machine_reset_cb(void *opaque)
> +{
> + S390CPU *cpu = opaque;
> +
> + cpu_reset(CPU(cpu));
> }
>
> static void s390_cpu_initfn(Object *obj)
> @@ -66,7 +92,12 @@ static void s390_cpu_initfn(Object *obj)
> env->cpu_num = cpu_num++;
> env->ext_index = -1;
>
> + /* 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;
> cpu_reset(CPU(cpu));
> + qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
> }
>
> static void s390_cpu_class_init(ObjectClass *oc, void *data)
> diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
> index 94de764..fda9f1f 100644
> --- a/target-s390x/kvm.c
> +++ b/target-s390x/kvm.c
> @@ -85,7 +85,14 @@ int kvm_arch_init_vcpu(CPUS390XState *env)
>
> void kvm_arch_reset_vcpu(CPUS390XState *env)
> {
> - /* 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(env, KVM_S390_INITIAL_RESET, NULL)) {
> + perror("Can't reset vcpu\n");
> + }
> }
>
> int kvm_arch_put_registers(CPUS390XState *env, int level)
> --
> 1.7.12.4
>