On Tue, Feb 18, 2025 at 10:10:07PM +1100, Alexey Kardashevskiy wrote:
> diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
> index d7e30d4f7503..3bd533d2e65d 100644
> --- a/include/linux/dma-direct.h
> +++ b/include/linux/dma-direct.h
> @@ -94,6 +94,14 @@ static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev,
> */
> static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
> {
> +#if defined(CONFIG_TSM_GUEST) || defined(CONFIG_TSM_GUEST_MODULE)
> + if (dev->tdi_enabled) {
> + dev_warn_once(dev, "(TIO) Disable SME");
> + if (!dev->tdi_validated)
> + dev_warn(dev, "TDI is not validated, DMA @%llx will fail", paddr);
> + return phys_to_dma_unencrypted(dev, paddr);
> + }
> +#endif
> return __sme_set(phys_to_dma_unencrypted(dev, paddr));
> }
>
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index 3dae0f592063..67bea31fa42a 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -173,6 +173,14 @@ static inline bool is_swiotlb_force_bounce(struct device *dev)
> {
> struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
>
> +#if defined(CONFIG_TSM_GUEST) || defined(CONFIG_TSM_GUEST_MODULE)
> + if (dev->tdi_enabled) {
> + dev_warn_once(dev, "(TIO) Disable SWIOTLB");
> + if (!dev->tdi_validated)
> + dev_warn(dev, "TDI is not validated");
> + return false;
> + }
> +#endif
> return mem && mem->force_bounce;
> }
>
> diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
> index 95bae74fdab2..c9c99154bec9 100644
> --- a/arch/x86/mm/mem_encrypt.c
> +++ b/arch/x86/mm/mem_encrypt.c
> @@ -19,6 +19,12 @@
> /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
> bool force_dma_unencrypted(struct device *dev)
> {
> +#if defined(CONFIG_TSM_GUEST) || defined(CONFIG_TSM_GUEST_MODULE)
> + if (dev->tdi_enabled) {
> + dev_warn_once(dev, "(TIO) Disable decryption");
> + return false;
> + }
> +#endif
Duplicated code with ugly ifdeffery. Perhaps do a helper which you call
everywhere instead?
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
