Hello Halil, Halil Pasic <pasic@xxxxxxxxxxxxx> writes: > 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@xxxxxxxxxxxxx> > Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx> > --- > arch/s390/Kconfig | 4 +++ > arch/s390/include/asm/mem_encrypt.h | 18 +++++++++++ > arch/s390/mm/init.c | 47 +++++++++++++++++++++++++++++ > 3 files changed, 69 insertions(+) > create mode 100644 arch/s390/include/asm/mem_encrypt.h > > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig > index 109243fdb6ec..88d8355b7bf7 100644 > --- a/arch/s390/Kconfig > +++ b/arch/s390/Kconfig > @@ -1,4 +1,7 @@ > # SPDX-License-Identifier: GPL-2.0 > +config ARCH_HAS_MEM_ENCRYPT > + def_bool y > + > config MMU > def_bool y > ARCH_HAS_MEM_ENCRYPT is already defined in arch/Kconfig, so I think you can just select it in config S390 like you do with SWIOTLB. > @@ -187,6 +190,7 @@ config S390 > select VIRT_CPU_ACCOUNTING > select ARCH_HAS_SCALED_CPUTIME > select HAVE_NMI > + select SWIOTLB > > > config SCHED_OMIT_FRAME_POINTER -- Thiago Jung Bauermann IBM Linux Technology Center
