[Qemu-devel] [PATCH v1 0/2] s390x/tcg: TEST PROTECTION and memory hotplug

[David Hildenbrand <david@redhat.com>]

While trying to fix TCG so I can properly detect memory in kvm-unit-tests
... looks like I accidentally made memory hotplug under TCG work (whoops).

qemu-system-s390x ... -m 2048,maxmem=4096M,slots=4 ...

[root@localhost ~]# cat /proc/meminfo
MemTotal:        4143632 kB
MemFree:         3845248 kB
MemAvailable:    3947932 kB

[root@localhost ~]# lsmem
RANGE                                  SIZE  STATE REMOVABLE BLOCK
0x0000000000000000-0x000000000fffffff  256M online        no     0
0x0000000010000000-0x000000006fffffff  1.5G online       yes   1-6
0x0000000070000000-0x00000000ffffffff  2.3G online        no  7-15

Memory block size:       256M
Total online memory:       4G
Total offline memory:      0B

I am not sure if we want to have memory hotplug in its current form later
on (the guest can hotplug memory itself). This is different compared to
all other architectures. E.g. when booting Fedora 27, it will simply
hotplug and add all memory. This doesn't make any sense in the context of
VMs where you want to be able to control from the outside, when and how
much more memory is given to a VM. But anyhow, seems to work ...


David Hildenbrand (2):
  s390x/tcg: implement TEST PROTECTION
  s390x/sclp: fix missing be conversion

 hw/s390x/sclp.c           |  4 ++--
 target/s390x/helper.h     |  2 +-
 target/s390x/mem_helper.c | 41 +++++++++++++++++++++++++++++++++++++++--
 target/s390x/translate.c  |  2 +-
 4 files changed, 43 insertions(+), 6 deletions(-)

-- 
2.14.3