This patchset adds support in s390 for a pool of standby memory, which can be set online/offline by the guest (ie, via chmem). The standby pool of memory is allocated as the difference between the initial memory setting and the maxmem setting. As part of this work, additional results are provided for the Read SCP Information SCLP, and new implentation is added for the Read Storage Element Information, Attach Storage Element, Assign Storage and Unassign Storage SCLPs, which enables the s390 guest to manipulate the standby memory pool.
This patchset is based on work originally done by Jeng-Fang (Nick) Wang. Changes for v5: * Since ACPI memory hotplug is now in, removed Igor's patches from this set. * Updated sclp.c to use object_resolve_path() instead of object_property_find(). Changes for v4: * Remove initialization code from get_sclp_memory_hotplug_dev() and place in its own function, init_sclp_memory_hotplug_dev(). * Add hit to qemu-options.hx to note the fact that the memory size specified via -m might be forced to a boundary. * Account for the legacy s390 machine, which does not support memory hotplug. * Fix a bug in sclp.c - Change memory hotplug device parent to sysbus. * Pulled latest version of Igor's patch. Matthew Rosato (3): sclp-s390: Add device to manage s390 memory hotplug virtio-ccw: Include standby memory when calculating storage increment sclp-s390: Add memory hotplug SCLPs hw/s390x/s390-virtio-ccw.c | 46 +++++-- hw/s390x/sclp.c | 289 +++++++++++++++++++++++++++++++++++++++++++- include/hw/s390x/sclp.h | 20 +++ qemu-options.hx | 3 +- target-s390x/cpu.h | 18 +++ target-s390x/kvm.c | 5 + 6 files changed, 366 insertions(+), 15 deletions(-) -- 1.7.9.5
