Commit 8a08b9c7 authored Jan 26, 2016 by Cornelia Huck Committed by Christian Borntraeger Feb 10, 2016

KVM: s390: usage hint for adapter mappings



The interface for adapter mappings was designed with code in mind
that maps each address only once; let's document this.

Otherwise, duplicate mappings are added to the list, which makes
the code ineffective and uses up the limited amount of mapping
needlessly.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

parent eaf2b656

Documentation/virtual/kvm/devices/s390_flic.txt

+2 −0

Original line number	Diff line number	Diff line
		@@ -88,6 +88,8 @@ struct kvm_s390_io_adapter_req {
		perform a gmap translation for the guest address provided in addr,
		pin a userspace page for the translated address and add it to the
		list of mappings
		Note: A new mapping will be created unconditionally; therefore,
		the calling code should avoid making duplicate mappings.

		KVM_S390_IO_ADAPTER_UNMAP
		release a userspace page for the translated address specified in addr

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