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Wed, 28 Jul 2021 07:53:30 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, ardb@kernel.org, Tianyu.Lan@microsoft.com, rientjes@google.com, martin.b.radev@gmail.com, akpm@linux-foundation.org, rppt@kernel.org, kirill.shutemov@linux.intel.com, aneesh.kumar@linux.ibm.com, krish.sadhukhan@oracle.com, saravanand@fb.com, xen-devel@lists.xenproject.org, pgonda@google.com, david@redhat.com, keescook@chromium.org, hannes@cmpxchg.org, sfr@canb.auug.org.au, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, anparri@microsoft.com Subject: [PATCH 09/13] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Date: Wed, 28 Jul 2021 10:52:24 -0400 Message-Id: <20210728145232.285861-10-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210728145232.285861-1-ltykernel@gmail.com> References: <20210728145232.285861-1-ltykernel@gmail.com> MIME-Version: 1.0 From: Tianyu Lan In Hyper-V Isolation VM with AMD SEV, swiotlb boucne buffer needs to be mapped into address space above vTOM and so introduce dma_map_decrypted/dma_unmap_encrypted() to map/unmap bounce buffer memory. The platform can populate man/unmap callback in the dma memory decrypted ops. Signed-off-by: Tianyu Lan --- include/linux/dma-map-ops.h | 9 +++++++++ kernel/dma/mapping.c | 22 ++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 0d53a96a3d64..01d60a024e45 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -71,6 +71,11 @@ struct dma_map_ops { unsigned long (*get_merge_boundary)(struct device *dev); }; +struct dma_memory_decrypted_ops { + void *(*map)(void *addr, unsigned long size); + void (*unmap)(void *addr); +}; + #ifdef CONFIG_DMA_OPS #include @@ -374,6 +379,10 @@ static inline void debug_dma_dump_mappings(struct device *dev) } #endif /* CONFIG_DMA_API_DEBUG */ +void *dma_map_decrypted(void *addr, unsigned long size); +int dma_unmap_decrypted(void *addr, unsigned long size); + extern const struct dma_map_ops dma_dummy_ops; +extern struct dma_memory_decrypted_ops dma_memory_generic_decrypted_ops; #endif /* _LINUX_DMA_MAP_OPS_H */ diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 2b06a809d0b9..6fb150dc1750 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -13,11 +13,13 @@ #include #include #include +#include #include "debug.h" #include "direct.h" bool dma_default_coherent; +struct dma_memory_decrypted_ops dma_memory_generic_decrypted_ops; /* * Managed DMA API */ @@ -736,3 +738,23 @@ unsigned long dma_get_merge_boundary(struct device *dev) return ops->get_merge_boundary(dev); } EXPORT_SYMBOL_GPL(dma_get_merge_boundary); + +void *dma_map_decrypted(void *addr, unsigned long size) +{ + if (set_memory_decrypted((unsigned long)addr, + size / PAGE_SIZE)) + return NULL; + + if (dma_memory_generic_decrypted_ops.map) + return dma_memory_generic_decrypted_ops.map(addr, size); + else + return addr; +} + +int dma_unmap_encrypted(void *addr, unsigned long size) +{ + if (dma_memory_generic_decrypted_ops.unmap) + dma_memory_generic_decrypted_ops.unmap(addr); + + return set_memory_encrypted((unsigned long)addr, size / PAGE_SIZE); +}