Secure guest memory is inacessible to devices so regular DMA isn't
possible.

In that case set devices' dma_map_ops to NULL so that the generic
DMA code path will use SWIOTLB and DMA to bounce buffers.

Signed-off-by: Thiago Jung Bauermann <bauer...@linux.ibm.com>
---
 arch/powerpc/platforms/pseries/iommu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/iommu.c 
b/arch/powerpc/platforms/pseries/iommu.c
index 889dc2e44b89..6fd8c8581873 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -36,6 +36,7 @@
 #include <asm/udbg.h>
 #include <asm/mmzone.h>
 #include <asm/plpar_wrappers.h>
+#include <asm/svm.h>
 
 #include "pseries.h"
 
@@ -1318,7 +1319,10 @@ void iommu_init_early_pSeries(void)
        of_reconfig_notifier_register(&iommu_reconfig_nb);
        register_memory_notifier(&iommu_mem_nb);
 
-       set_pci_dma_ops(&dma_iommu_ops);
+       if (is_secure_guest())
+               set_pci_dma_ops(NULL);
+       else
+               set_pci_dma_ops(&dma_iommu_ops);
 }
 
 static int __init disable_multitce(char *str)

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