KVM: s390: make cmma usage conditionally
authorDominik Dingel <dingel@linux.vnet.ibm.com>
Tue, 25 Mar 2014 12:47:11 +0000 (13:47 +0100)
committerChristian Borntraeger <borntraeger@de.ibm.com>
Tue, 22 Apr 2014 11:24:13 +0000 (13:24 +0200)
commitb31605c12f4edda7a40ad9f86985739666298c31
tree6dbda314904aeef619702812f7b6aab836459dde
parentf2061656209fb9a5d54bbb1999f0a633438504e7
KVM: s390: make cmma usage conditionally

When userspace reset the guest without notifying kvm, the CMMA state
of the pages might be unused, resulting in guest data corruption.
To avoid this, CMMA must be enabled only if userspace understands
the implications.

CMMA must be enabled before vCPU creation. It can't be switched off
once enabled.  All subsequently created vCPUs will be enabled for
CMMA according to the CMMA state of the VM.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[remove now unnecessary calls to page_table_reset_pgste]
arch/s390/include/asm/kvm_host.h
arch/s390/kvm/diag.c
arch/s390/kvm/kvm-s390.c
arch/s390/kvm/kvm-s390.h
arch/s390/kvm/priv.c