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Re: [Qemu-devel] [PATCH 2/3] s390: Add CPU reset handler
From: |
Jens Freimann |
Subject: |
Re: [Qemu-devel] [PATCH 2/3] s390: Add CPU reset handler |
Date: |
Wed, 12 Dec 2012 16:04:06 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Dec 12, 2012 at 02:38:40PM +0100, Alexander Graf wrote:
>
> On 12.12.2012, at 14:08, Jens Freimann wrote:
>
> > Add a CPU reset handler to have all CPUs in a PoP compliant
> > state.
> >
> > Signed-off-by: Jens Freimann <address@hidden>
> >
> > ---
> > 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 | 31 +++++++++++++++++++++++++++++--
> > target-s390x/kvm.c | 9 ++++++++-
> > 2 files changed, 37 insertions(+), 3 deletions(-)
> >
> > diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
> > index 619b202..75f60b3 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
> > @@ -18,9 +19,13 @@
> > * 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"
> >
> > @@ -37,12 +42,29 @@ static void s390_cpu_reset(CPUState *s)
> > log_cpu_state(env, 0);
> > }
> >
> > - scc->parent_reset(s);
> > + s390_del_running_cpu(env);
> >
> > + scc->parent_reset(s);
> > memset(env, 0, offsetof(CPUS390XState, breakpoints));
> > +
> > + /* architectured initial values for CR 0 and 14 */
> > + env->cregs[0] = 0xE0UL;
> > + env->cregs[14] = 0xC2000000UL;
> > + /* set to z/Architecture mode */
> > + env->psw.mask = 0x0000000180000000ULL;
> > + env->psa = 0;
> > + /* set halted to 1 to make sure we can add the cpu in
> > + * s390_ipl_cpu code */
> > + env->halted = 1;
>
> So who sets cpu0 to halted=0 again? Please add that as a comment here.
It is set to halted=0 by s390_add_running_cpu() in s390_ipl_cpu() for
cpu 0 and via the sigp restart path for all other cpus.
I will add a comment and send a new version.
Jens
> Alex
>
> > /* FIXME: reset vector? */
> > 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 +88,12 @@ 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
> >
>
--
Mit freundlichen Grüßen / Kind regards
Jens Freimann
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- [Qemu-devel] [PATCH 0/3] s390: ipl device, cpu reset handler and cpu model support, Jens Freimann, 2012/12/12
- [Qemu-devel] [PATCH 1/3] s390: Move IPL code into a separate device, Jens Freimann, 2012/12/12
- [Qemu-devel] [PATCH 2/3] s390: Add CPU reset handler, Jens Freimann, 2012/12/12
- [Qemu-devel] [PATCH 3/3] S390: Enable -cpu help and QMP query-cpu-definitions, Jens Freimann, 2012/12/12
- Re: [Qemu-devel] [PATCH 3/3] S390: Enable -cpu help and QMP query-cpu-definitions, Viktor Mihajlovski, 2012/12/12
- Re: [Qemu-devel] [PATCH 3/3] S390: Enable -cpu help and QMP query-cpu-definitions, Alexander Graf, 2012/12/12
- Re: [Qemu-devel] [PATCH 3/3] S390: Enable -cpu help and QMP query-cpu-definitions, Andreas Färber, 2012/12/12