s390/mm: force swiotlb for protected virtualization

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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>

...

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Halil Pasic 2018-09-13 18:57:16 +02:00 • committed by Heiko Carstens

parent 45488c48e4

commit 64e1f0c531

3 changed files with 68 additions and 0 deletions

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4

arch/s390/Kconfig

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17

arch/s390/include/asm/mem_encrypt.h

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47

arch/s390/mm/init.c

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