Ram Pai <[email protected]> writes:
> This enables IOMMU support for pseries Secure VMs.
Can you give us some more explanation please?
This is basically a revert of commit:
edea902c1c1e ("powerpc/pseries/iommu: Don't use dma_iommu_ops on secure
guests")
But neglects to remove the now unnecessary include of svm.h.
> diff --git a/arch/powerpc/platforms/pseries/iommu.c
> b/arch/powerpc/platforms/pseries/iommu.c
> index 07f0847..189717b 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -1333,15 +1333,7 @@ void iommu_init_early_pSeries(void)
> of_reconfig_notifier_register(&iommu_reconfig_nb);
> register_memory_notifier(&iommu_mem_nb);
>
> - /*
> - * 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.
Please explain what has changed to make this no longer necessary.
cheers
> - */
> - if (!is_secure_guest())
> - set_pci_dma_ops(&dma_iommu_ops);
> + set_pci_dma_ops(&dma_iommu_ops);
> }
>
> static int __init disable_multitce(char *str)
> --
> 1.8.3.1
