Re: [Qemu-devel] [PATCH v5 1/1] s390x/cpu: expose the guest crash information

[Cornelia Huck <cohuck@redhat.com>]

On Tue,  6 Feb 2018 07:46:22 +0000
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> 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) qom-get path=/machine/cpu[0]/ property=crash-information
>   {"return": {"psw-addr": 1105350, "psw-mask": 562956395872256, "reason":
>    "disabled wait", "type": "s390"}}

Hm, for me cpu0 shows up under /machine/unattached/device[0].

> 
>   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": 1499931739,
>           "microseconds": 961296
>       },
>       "event": "GUEST_PANICKED",
>       "data": {
>           "action": "pause",
>           "info": {
>               "psw-addr": 1105350,
>               "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
>   S390 crash parameters: (0x0000100000000000 0x0000000000000006)
>   S390 crash reason: operation exception loop
> 
> Co-authored-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  qapi/run-state.json   | 27 ++++++++++++++++++++++--
>  target/s390x/cpu.c    | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  target/s390x/cpu.h    | 11 ++++++++++
>  target/s390x/helper.c |  5 ++++-
>  target/s390x/kvm.c    | 15 +++++++-------
>  vl.c                  |  6 ++++++
>  6 files changed, 110 insertions(+), 11 deletions(-)

Looks good to me. Will apply, but waiting for an ack/review.