diff options
| author | Thiago Jung Bauermann <bauerman@linux.ibm.com> | 2019-08-20 05:13:23 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 02:55:41 +0300 |
| commit | edea902c1c1efb855f77e041f9daf1abe7a9768a (patch) | |
| tree | 5b36c86623d7cd9128ecff8bac88ccb68557e020 /arch/powerpc/platforms | |
| parent | 4edaac512c8a31b0aa715b58ee00ee06df642fa2 (diff) | |
| download | linux-edea902c1c1efb855f77e041f9daf1abe7a9768a.tar.xz | |
powerpc/pseries/iommu: Don't use dma_iommu_ops on secure guests
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 <bauerman@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820021326.6884-14-bauerman@linux.ibm.com
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/pseries/iommu.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index df7db33ca93b..6ba081dd61c9 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" @@ -1319,7 +1320,15 @@ 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) |