diff options
| author | Janosch Frank <frankja@linux.ibm.com> | 2018-09-28 11:34:35 +0200 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2018-10-04 10:32:39 +0200 |
| commit | 28221f9c999a9b34f58d94599da9c229df9a4fed (patch) | |
| tree | 175191aa874838eae396108e6be32b2a289c58d6 /hw/s390x | |
| parent | cb89b349074310ff9eb7ebe18a8ae24d7d9ea3fb (diff) | |
| download | qemu-28221f9c999a9b34f58d94599da9c229df9a4fed.zip | |
s390x: Fence huge pages prior to 3.1
As the kernel has no way of disallowing the start of a huge page
backed VM, we can migrate a running huge backed VM to a host that has
no huge page KVM support.
Let's glue huge page support support to the 3.1 machine, so we do not
migrate to a destination host that doesn't have QEMU huge page support
and can stop migration if KVM doesn't indicate support.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20180928093435.198573-1-frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'hw/s390x')
| -rw-r--r-- | hw/s390x/s390-virtio-ccw.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index f0f7fdcadd..53fd7c975f 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -456,6 +456,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data) s390mc->ri_allowed = true; s390mc->cpu_model_allowed = true; s390mc->css_migration_enabled = true; + s390mc->hpage_1m_allowed = true; mc->init = ccw_init; mc->reset = s390_machine_reset; mc->hot_add_cpu = s390_hot_add_cpu; @@ -535,6 +536,12 @@ bool cpu_model_allowed(void) return get_machine_class()->cpu_model_allowed; } +bool hpage_1m_allowed(void) +{ + /* for "none" machine this results in true */ + return get_machine_class()->hpage_1m_allowed; +} + static char *machine_get_loadparm(Object *obj, Error **errp) { S390CcwMachineState *ms = S390_CCW_MACHINE(obj); @@ -747,6 +754,9 @@ static void ccw_machine_3_0_instance_options(MachineState *machine) static void ccw_machine_3_0_class_options(MachineClass *mc) { + S390CcwMachineClass *s390mc = S390_MACHINE_CLASS(mc); + + s390mc->hpage_1m_allowed = false; ccw_machine_3_1_class_options(mc); SET_MACHINE_COMPAT(mc, CCW_COMPAT_3_0); } |