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s390x/cpu: expose the guest crash information

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This patch is the s390 implementation of guest crash information,
similar to commit d187e08dc4 ("i386/cpu: add crash-information QOM
property") and the related commits. We will detect several crash
reasons, with the "disabled wait" being the most important one, since
this is used by all s390 guests as a "panic like" notification.

Demonstrate these ways with examples as follows.

  1. crash-information QOM property;

  Run qemu with -qmp unix:qmp-sock,server, then use utility "qmp-shell"
  to execute "qom-get" command, and might get the result like,

  (QEMU) (QEMU) qom-get path=/machine/unattached/device[0] \
      property=crash-information
  {"return": {"core": 0, "reason": "disabled-wait", "psw-mask": 562956395872256, \
      "type": "s390", "psw-addr": 1102832}}

  2. GUEST_PANICKED event reporting;

  Run qemu with a socket option, and telnet or nc to that,
  -chardev socket,id=qmp,port=4444,host=localhost,server \
  -mon chardev=qmp,mode=control,pretty=on \
  Negotiating the mode by { "execute": "qmp_capabilities" }, and the crash
  information will be reported on a guest crash event like,

  {
    "timestamp": {
        "seconds": 1518004739,
        "microseconds": 552563
    },
    "event": "GUEST_PANICKED",
    "data": {
        "action": "pause",
        "info": {
            "core": 0,
            "psw-addr": 1102832,
            "reason": "disabled-wait",
            "psw-mask": 562956395872256,
            "type": "s390"
        }
    }
  }

  3. log;

  Run qemu with the parameters: -D <logfile> -d guest_errors, to
  specify the logfile and log item. The results might be,

  Guest crashed on cpu 0: disabled-wait
  PSW: 0x0002000180000000 0x000000000010d3f0

Co-authored-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20180209122543.25755-1-borntraeger@de.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[CH: tweaked qapi comment]
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2018-02-09 12:25:43 +00:00 • committed by Cornelia Huck
parent 0a773d55ac
commit 4ada99ade2
6 changed files with 120 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

45
target/s390x/cpu.c
View file

@ -35,6 +35,8 @@
#include "qemu/error-report.h"
#include "trace.h"
#include "qapi/visitor.h"
#include "qapi-visit.h"
#include "sysemu/hw_accel.h"
#include "exec/exec-all.h"
#include "hw/qdev-properties.h"
#ifndef CONFIG_USER_ONLY
@ -228,6 +230,46 @@ out:
error_propagate(errp, err);
}
static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
{
GuestPanicInformation *panic_info;
S390CPU *cpu = S390_CPU(cs);
cpu_synchronize_state(cs);
panic_info = g_malloc0(sizeof(GuestPanicInformation));
panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
#if !defined(CONFIG_USER_ONLY)
panic_info->u.s390.core = cpu->env.core_id;
#else
panic_info->u.s390.core = 0; /* sane default for non system emulation */
#endif
panic_info->u.s390.psw_mask = cpu->env.psw.mask;
panic_info->u.s390.psw_addr = cpu->env.psw.addr;
panic_info->u.s390.reason = cpu->env.crash_reason;
return panic_info;
}
static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
CPUState *cs = CPU(obj);
GuestPanicInformation *panic_info;
if (!cs->crash_occurred) {
error_setg(errp, "No crash occurred");
return;
}
panic_info = s390_cpu_get_crash_info(cs);
visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
errp);
qapi_free_GuestPanicInformation(panic_info);
}
static void s390_cpu_initfn(Object *obj)
{
CPUState *cs = CPU(obj);
@ -240,6 +282,8 @@ static void s390_cpu_initfn(Object *obj)
cs->env_ptr = env;
cs->halted = 1;
cs->exception_index = EXCP_HLT;
object_property_add(obj, "crash-information", "GuestPanicInformation",
s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
s390_cpu_model_register_props(obj);
#if !defined(CONFIG_USER_ONLY)
qemu_get_timedate(&tm, 0);
@ -473,6 +517,7 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
cc->do_interrupt = s390_cpu_do_interrupt;
#endif
cc->dump_state = s390_cpu_dump_state;
cc->get_crash_info = s390_cpu_get_crash_info;
cc->set_pc = s390_cpu_set_pc;
cc->gdb_read_register = s390_cpu_gdb_read_register;
cc->gdb_write_register = s390_cpu_gdb_write_register;