On 07/30/2014 02:15 PM, Matthew Rosato wrote: > 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. > > Sample qemu command snippet: > > qemu -machine s390-ccw-virtio -m 1024M,maxmem=2048M,slots=32 -enable-kvm > > This will allocate 1024M of active memory, and another 1024M > of standby memory. Example output from s390-tools lsmem: > ============================================================================= > 0x0000000000000000-0x000000000fffffff 256 online no 0-127 > 0x0000000010000000-0x000000001fffffff 256 online yes 128-255 > 0x0000000020000000-0x000000003fffffff 512 online no 256-511 > 0x0000000040000000-0x000000007fffffff 1024 offline - 512-1023 > > Memory device size : 2 MB > Memory block size : 256 MB > Total online memory : 1024 MB > Total offline memory: 1024 MB > > > The guest can dynamically enable part or all of the standby pool > via the s390-tools chmem, for example: > > chmem -e 512M > > And can attempt to dynamically disable: > > chmem -d 512M > > Changes for v7: > * Added patch to enforce the same memory alignments in s390-virtio.c, > so that shared code (like sclp) doesn't need to be dual paths.
Ping... > > Changes for v6: > * Fix in sclp.h - DeviceState parent --> SysBusDevice parent > in struct sclpMemoryHotplugDev. > * Fix in assign_storage - int this_subregion_size, should > be uint64_t. > * Added information on how to test in the cover letter. > > 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(). > > Matthew Rosato (4): > sclp-s390: Add device to manage s390 memory hotplug > virtio-ccw: Include standby memory when calculating storage increment > s390-virtio: Apply same memory boundaries as virtio-ccw > sclp-s390: Add memory hotplug SCLPs > > hw/s390x/s390-virtio-ccw.c | 46 +++++-- > hw/s390x/s390-virtio.c | 15 ++- > 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 + > 7 files changed, 375 insertions(+), 21 deletions(-) >