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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2efbc58f15
SWIOTLB checks range of incoming CPU addresses to be bounced and sees if the device can access it through its DMA window without requiring bouncing. In such cases it just chooses to skip bouncing. But for cases like secure guests on powerpc platform all addresses need to be bounced into the shared pool of memory because the host cannot access it otherwise. Hence the need to do the bouncing is not related to device's DMA window and use of bounce buffers is forced by setting swiotlb_force. Also, connect the shared memory conversion functions into the ARCH_HAS_MEM_ENCRYPT hooks and call swiotlb_update_mem_attributes() to convert SWIOTLB's memory pool to shared memory. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> [ bauerman: Use ARCH_HAS_MEM_ENCRYPT hooks to share swiotlb memory pool. ] Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190820021326.6884-15-bauerman@linux.ibm.com
27 lines
532 B
C
27 lines
532 B
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* SVM helper functions
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*
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* Copyright 2018 IBM Corporation
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*/
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#ifndef _ASM_POWERPC_MEM_ENCRYPT_H
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#define _ASM_POWERPC_MEM_ENCRYPT_H
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#include <asm/svm.h>
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static inline bool mem_encrypt_active(void)
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{
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return is_secure_guest();
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}
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static inline bool force_dma_unencrypted(struct device *dev)
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{
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return is_secure_guest();
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}
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int set_memory_encrypted(unsigned long addr, int numpages);
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int set_memory_decrypted(unsigned long addr, int numpages);
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#endif /* _ASM_POWERPC_MEM_ENCRYPT_H */
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