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KVM: s390: Exploiting generic userspace interface for cmma

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To enable CMMA and to reset its state we use the vm kvm_device ioctls,
encapsulating attributes within the KVM_S390_VM_MEM_CTRL group.

Signed-off-by: Dominik Dingel <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>
This commit is contained in:
Dominik Dingel 2014-04-09 13:13:00 +02:00 • committed by Christian Borntraeger
commit 4f718eab26
3 changed files with 66 additions and 0 deletions
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16
Documentation/virtual/kvm/devices/vm.txt
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@ -8,3 +8,19 @@ and controls.
The groups and attributes per virtual machine, if any, are architecture
specific.
1. GROUP: KVM_S390_VM_MEM_CTRL
Architectures: s390
1.1. ATTRIBUTE: KVM_S390_VM_MEM_CTRL
Parameters: none
Returns: -EBUSY if already a vcpus is defined, otherwise 0
Enables CMMA for the virtual machine
1.2. ATTRIBUTE: KVM_S390_VM_CLR_CMMA
Parameteres: none
Returns: 0
Clear the CMMA status for all guest pages, so any pages the guest marked
as unused are again used any may not be reclaimed by the host.