qemu/hw/s390x
Christian Borntraeger 5c30ef937f vl/s390x: fixup ram sizes for compat machines
Older QEMU versions did fixup the ram size to match what can be reported
via sclp. We need to mimic this behaviour for machine types 4.2 and
older to not fail on inbound migration for memory sizes that do not fit.
Old machines with proper aligned memory sizes are not affected.

Alignment table:
 VM size (<=) | Alignment
--------------------------
      1020M   |     1M
      2040M   |     2M
      4080M   |     4M
      8160M   |     8M
     16320M   |    16M
     32640M   |    32M
     65280M   |    64M
    130560M   |   128M
    261120M   |   256M
    522240M   |   512M
   1044480M   |     1G
   2088960M   |     2G
   4177920M   |     4G
   8355840M   |     8G

Suggested action is to replace unaligned -m value with a suitable
aligned one or if a change to a newer machine type is possible, use a
machine version >= 5.0.

A future version might remove the compatibility handling.

For machine types >= 5.0 we can simply use an increment size of 1M and
use the full range of increment number which allows for all possible
memory sizes. The old limitation of having a maximum of 1020 increments
was added for standby memory, which we no longer support. With that we
can now support even weird memory sizes like 10001234 MB.

As we no longer fixup maxram_size as well, make other users use ram_size
instead. Keep using maxram_size when setting the maximum ram size in KVM,
as that will come in handy in the future when supporting memory hotplug
(in contrast, storage keys and storage attributes for hotplugged memory
will have to be migrated per RAM block in the future).

Fixes: 3a12fc61af ("390x/s390-virtio-ccw: use memdev for RAM")
Reported-by: Lukáš Doktor <ldoktor@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20200401123754.109602-1-borntraeger@de.ibm.com>
[CH: fixed up message on memory size fixup]
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
2020-04-02 17:10:09 +02:00
..
3270-ccw.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
ap-bridge.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
ap-device.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
ccw-device.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
ccw-device.h s390x: vmstatify config migration for virtio-ccw 2017-07-05 12:16:55 +02:00
css-bridge.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
css.c Avoid address_space_rw() with a constant is_write argument 2020-02-20 14:47:08 +01:00
event-facility.c s390x/event-facility: fix error propagation 2020-01-27 12:13:09 +01:00
ipl.c s390/ipl: fix off-by-one in update_machine_ipl_properties() 2020-03-23 12:36:27 +01:00
ipl.h s390x: ipl: Consolidate iplb validity check into one function 2020-03-10 10:18:20 +01:00
Kconfig kconfig: add CONFIG_MSI_NONBROKEN 2019-03-18 09:39:57 +01:00
Makefile.objs s390x: express dependencies with Kconfig 2019-03-07 21:46:19 +01:00
s390-ccw.c sysemu: Move the VMChangeStateEntry typedef to qemu/typedefs.h 2019-08-16 13:31:53 +02:00
s390-pci-bus.c Let cpu_[physical]_memory() calls pass a boolean 'is_write' argument 2020-02-20 14:47:08 +01:00
s390-pci-bus.h s390x/pci: Drop release timer and replace it with a flag 2019-02-04 13:47:50 +01:00
s390-pci-inst.c add device_legacy_reset function to prepare for reset api change 2020-01-30 16:02:03 +00:00
s390-pci-inst.h s390x/pci: add common function measurement block 2019-01-18 11:52:01 +01:00
s390-skeys-kvm.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
s390-skeys.c vl/s390x: fixup ram sizes for compat machines 2020-04-02 17:10:09 +02:00
s390-stattrib-kvm.c vl/s390x: fixup ram sizes for compat machines 2020-04-02 17:10:09 +02:00
s390-stattrib.c hw/s390x: rename Error ** parameter to more common errp 2019-12-18 08:43:19 +01:00
s390-virtio-ccw.c vl/s390x: fixup ram sizes for compat machines 2020-04-02 17:10:09 +02:00
s390-virtio-hcall.c s390x: rename s390-virtio.h to s390-virtio-hcall.h 2017-09-19 18:31:31 +02:00
s390-virtio-hcall.h s390/kvm_virtio/linux-headers: remove traces of old virtio transport 2017-11-24 10:52:05 +01:00
sclp.c vl/s390x: fixup ram sizes for compat machines 2020-04-02 17:10:09 +02:00
sclpcpu.c Clean up inclusion of sysemu/sysemu.h 2019-08-16 13:31:53 +02:00
sclpquiesce.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
tod-kvm.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
tod-qemu.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
tod.c migration: register_savevm_live doesn't need dev 2019-09-12 11:15:03 +01:00
trace-events trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
vhost-vsock-ccw.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-9p.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-balloon.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-blk.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-crypto.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-gpu.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-input.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-net.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-rng.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-scsi.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw-serial.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
virtio-ccw.c misc: Replace zero-length arrays with flexible array member (manual) 2020-03-16 22:07:42 +01:00
virtio-ccw.h s390x/ccw: make sure all ccw devices are properly reset 2018-05-14 17:10:02 +02:00