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From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
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Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
	linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
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	dave.hansen@intel.com
Subject: [PATCH V4 09/13] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function
Date: Fri, 27 Aug 2021 13:21:07 -0400	[thread overview]
Message-ID: <20210827172114.414281-10-ltykernel@gmail.com> (raw)
In-Reply-To: <20210827172114.414281-1-ltykernel@gmail.com>

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

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. The swiotlb bounce buffer
PA will be returned to driver and used for DMA address. The new
mapped virtual address is just to acess bounce buffer in the
swiotlb code. PAs passed to DMA API still have backing struct page.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 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 <asm/dma-mapping.h>
 
@@ -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 <linux/of_device.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <asm/set_memory.h>
 #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);
+}
-- 
2.25.1


  parent reply	other threads:[~2021-08-27 17:22 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-27 17:20 [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-08-27 17:20 ` [PATCH V4 01/13] x86/hyperv: Initialize GHCB page in Isolation VM Tianyu Lan
2021-09-02  0:15   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 02/13] x86/hyperv: Initialize shared memory boundary in the " Tianyu Lan
2021-09-02  0:15   ` Michael Kelley
2021-09-02  6:35     ` Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 03/13] x86/hyperv: Add new hvcall guest address host visibility support Tianyu Lan
2021-09-02  0:16   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 04/13] hyperv: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-08-27 17:41   ` Greg KH
2021-08-27 17:44     ` Tianyu Lan
2021-09-02  0:17   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 05/13] hyperv: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-08-27 17:41   ` Greg KH
2021-08-27 17:46     ` Tianyu Lan
2021-09-02  3:32   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 06/13] hyperv: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-09-02  0:20   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 07/13] hyperv/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-09-02  0:21   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 08/13] hyperv/vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-09-02  0:23   ` Michael Kelley
2021-09-02 13:35     ` Tianyu Lan
2021-09-02 16:14       ` Michael Kelley
2021-08-27 17:21 ` Tianyu Lan [this message]
2021-08-27 17:21 ` [PATCH V4 10/13] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 11/13] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-09-02  1:27   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 12/13] hv_netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-09-02  2:34   ` Michael Kelley
2021-09-02  4:56     ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 13/13] hv_storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-09-02  2:08   ` Michael Kelley
2021-08-30 12:00 ` [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Christoph Hellwig
2021-08-31 15:20   ` Tianyu Lan
2021-09-02  7:51     ` Christoph Hellwig
2021-08-31 17:16   ` Michael Kelley
2021-09-02  7:59     ` Christoph Hellwig
2021-09-02 11:21       ` Tianyu Lan
2021-09-02 15:57       ` Michael Kelley
2021-09-14 14:41         ` Tianyu Lan

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