tree e98f6f8de50fd7bf6f68627f558469c3b3f3915b
parent 45488c48e49b6ded9850bb0293668a92f96293c2
author Halil Pasic <pasic@linux.ibm.com> 1536857836 +0200
committer Heiko Carstens <heiko.carstens@de.ibm.com> 1560594291 +0200

s390/mm: force swiotlb for protected virtualization

On s390, protected virtualization guests have to use bounced I/O
buffers.  That requires some plumbing.

Let us make sure, any device that uses DMA API with direct ops correctly
is spared from the problems, that a hypervisor attempting I/O to a
non-shared page would bring.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>