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s390x/css: add s390-squash-mcss machine option

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We want to support real (i.e. not virtual) channel devices
even for guests that do not support MCSS-E (where guests may
see devices from any channel subsystem image at once). As all
virtio-ccw devices are in css 0xfe (and show up in the default
css 0 for guests not activating MCSS-E), we need an option to
squash both the virtio subchannels and e.g. passed-through
subchannels from their real css (0-3, or 0 for hosts not
activating MCSS-E) into the default css. This will be
exploited in a later patch.

Signed-off-by: Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170517004813.58227-4-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Xiao Feng Ren 2017-05-17 02:48:03 +02:00 • committed by Cornelia Huck
parent 74c98e20a6
commit 274250c301
4 changed files with 37 additions and 1 deletions
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21
hw/s390x/s390-virtio-ccw.c
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@ -303,6 +303,20 @@ static void machine_set_loadparm(Object *obj, const char *val, Error **errp)
ms->loadparm[i] = ' '; /* pad right with spaces */
}
}
static inline bool machine_get_squash_mcss(Object *obj, Error **errp)
{
S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
return ms->s390_squash_mcss;
}
static inline void machine_set_squash_mcss(Object *obj, bool value,
Error **errp)
{
S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
ms->s390_squash_mcss = value;
}
static inline void s390_machine_initfn(Object *obj)
{
@ -328,6 +342,13 @@ static inline void s390_machine_initfn(Object *obj)
" to upper case) to pass to machine loader, boot manager,"
" and guest kernel",
NULL);
object_property_add_bool(obj, "s390-squash-mcss",
machine_get_squash_mcss,
machine_set_squash_mcss, NULL);
object_property_set_description(obj, "s390-squash-mcss",
"enable/disable squashing subchannels into the default css",
NULL);
object_property_set_bool(obj, false, "s390-squash-mcss", NULL);
}
static const TypeInfo ccw_machine_info = {