Re: [Qemu-devel] [PATCH v7] s390x/cpu: expose the guest crash information

[Eric Blake <eblake@redhat.com>]

On 02/08/2018 03:57 AM, Christian Borntraeger 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.
> 

> Co-authored-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---

> +##
> +# @GuestPanicInformationS390:
> +#
> +# S390 specific guest panic information (PSW)
> +#
> +# @core: core id of the CPU that crashed
> +# @psw-mask: control fields of guest PSW
> +# @psw-addr: guest instruction address
> +# @reason: guest crash reason in human readable form
> +#
> +# Since: 2.12
> +##
> +{'struct': 'GuestPanicInformationS390',
> + 'data': { 'core': 'uint32',

Should core be optional,...


> +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;
> +#endif

...given that it is only conditionally assigned?  If so, you'd also need 
to set panic_info->u.s390.has_core when you have a core id to expose.


> +
> +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 occured");

s/occured/occurred/

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org