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 to bounce buffers for DMA.
Signed-off-by: Thiago Jung Bauermann <bauer...@linux.ibm.com>
---
arch/powerpc/platforms/pseries/iommu.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/pseries/iommu.c
b/arch/powerpc/platforms/pseries/iommu.c
index 889dc2e44b89..8d9c2b17ad54 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 +1319,15 @@ 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);
+ /*
+ * Secure guest memory is inacessible to devices so regular DMA isn't
+ * possible.
+ *
+ * In that case keep devices' dma_map_ops as NULL so that the generic
+ * DMA code path will use SWIOTLB to bounce buffers for DMA.
+ */
+ if (!is_secure_guest())
+ set_pci_dma_ops(&dma_iommu_ops);
}
static int __init disable_multitce(char *str)
