Commit aad3c1d9 authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
Browse files

KVM: s390: add documentation of KVM_S390_VM_TOD 



Let's properly document KVM_S390_VM_TOD and its attributes.

Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent efa48163

Documentation/virtual/kvm/devices/vm.txt

+19 −0
Original line number Diff line number Diff line
@@ -84,3 +84,22 @@ Returns: -EBUSY in case 1 or more vcpus are already activated (only in write 
	    -EFAULT if the given address is not accessible from kernel space

	    -ENOMEM if not enough memory is available to process the ioctl

	    0 in case of success



3. GROUP: KVM_S390_VM_TOD

Architectures: s390



3.1. ATTRIBUTE: KVM_S390_VM_TOD_HIGH



Allows user space to set/get the TOD clock extension (u8).



Parameters: address of a buffer in user space to store the data (u8) to

Returns:    -EFAULT if the given address is not accessible from kernel space

	    -EINVAL if setting the TOD clock extension to != 0 is not supported



3.2. ATTRIBUTE: KVM_S390_VM_TOD_LOW



Allows user space to set/get bits 0-63 of the TOD clock register as defined in

the POP (u64).



Parameters: address of a buffer in user space to store the data (u64) to

Returns:    -EFAULT if the given address is not accessible from kernel space

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