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From: Tianyu Lan <ltykernel@gmail.com>
To: Christoph Hellwig <hch@lst.de>
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, parri.andrea@gmail.com, 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,
	m.szyprowski@samsung.com, robin.murphy@arm.com,
	Tianyu.Lan@microsoft.com, rppt@kernel.org,
	kirill.shutemov@linux.intel.com, akpm@linux-foundation.org,
	brijesh.singh@amd.com, thomas.lendacky@amd.com,
	pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com,
	saravanand@fb.com, aneesh.kumar@linux.ibm.com,
	xen-devel@lists.xenproject.org, martin.b.radev@gmail.com,
	ardb@kernel.org, rientjes@google.com, tj@kernel.org,
	keescook@chromium.org, michael.h.kelley@microsoft.com
Subject: Re: [PATCH V2 10/14] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function
Date: Thu, 5 Aug 2021 23:56:29 +0800	[thread overview]
Message-ID: <fc36c85f-cc34-5ad2-8f9c-06dbe85ca165@gmail.com> (raw)
In-Reply-To: <20210804184513.512888-11-ltykernel@gmail.com>

Hi Christoph:
      Could you have a look at this patch? It adds new API 
dma_map_decrypted() to do memory decrypted and remap. It will
be used in the swiotlb code.

Thanks.

On 8/5/2021 2:45 AM, Tianyu Lan wrote:
> 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.
> 
> 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);
> +}
> 

  reply	other threads:[~2021-08-05 15:57 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 18:44 [PATCH V2 00/14] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-08-04 18:44 ` [PATCH V2 01/14] x86/HV: Initialize GHCB page in Isolation VM Tianyu Lan
2021-08-04 18:44 ` [PATCH V2 02/14] x86/HV: Initialize shared memory boundary in the " Tianyu Lan
2021-08-04 18:44 ` [PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support Tianyu Lan
2021-08-04 19:27   ` Dave Hansen
2021-08-05 14:05     ` Tianyu Lan
2021-08-05 14:11       ` Peter Zijlstra
2021-08-05 14:23       ` Peter Zijlstra
2021-08-05 14:29         ` Dave Hansen
2021-08-05 15:51           ` Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 04/14] x86/HV: Add new hvcall guest address host visibility support Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 05/14] HV: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 06/14] HV: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 07/14] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 08/14] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 09/14] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 10/14] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Tianyu Lan
2021-08-05 15:56   ` Tianyu Lan [this message]
2021-08-04 18:45 ` [PATCH V2 11/14] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-08-05 16:01   ` Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 12/14] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 13/14] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 14/14] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan

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