1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Secure VM platform 4 * 5 * Copyright 2018 IBM Corporation 6 * Author: Anshuman Khandual <khandual@linux.vnet.ibm.com> 7 */ 8 9 #include <linux/mm.h> 10 #include <asm/machdep.h> 11 #include <asm/svm.h> 12 #include <asm/swiotlb.h> 13 #include <asm/ultravisor.h> 14 15 static int __init init_svm(void) 16 { 17 if (!is_secure_guest()) 18 return 0; 19 20 /* Don't release the SWIOTLB buffer. */ 21 ppc_swiotlb_enable = 1; 22 23 /* 24 * Since the guest memory is inaccessible to the host, devices always 25 * need to use the SWIOTLB buffer for DMA even if dma_capable() says 26 * otherwise. 27 */ 28 swiotlb_force = SWIOTLB_FORCE; 29 30 /* Share the SWIOTLB buffer with the host. */ 31 swiotlb_update_mem_attributes(); 32 33 return 0; 34 } 35 machine_early_initcall(pseries, init_svm); 36 37 int set_memory_encrypted(unsigned long addr, int numpages) 38 { 39 if (!PAGE_ALIGNED(addr)) 40 return -EINVAL; 41 42 uv_unshare_page(PHYS_PFN(__pa(addr)), numpages); 43 44 return 0; 45 } 46 47 int set_memory_decrypted(unsigned long addr, int numpages) 48 { 49 if (!PAGE_ALIGNED(addr)) 50 return -EINVAL; 51 52 uv_share_page(PHYS_PFN(__pa(addr)), numpages); 53 54 return 0; 55 } 56 57 /* There's one dispatch log per CPU. */ 58 #define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE) 59 60 static struct page *dtl_page_store[NR_DTL_PAGE]; 61 static long dtl_nr_pages; 62 63 static bool is_dtl_page_shared(struct page *page) 64 { 65 long i; 66 67 for (i = 0; i < dtl_nr_pages; i++) 68 if (dtl_page_store[i] == page) 69 return true; 70 71 return false; 72 } 73 74 void dtl_cache_ctor(void *addr) 75 { 76 unsigned long pfn = PHYS_PFN(__pa(addr)); 77 struct page *page = pfn_to_page(pfn); 78 79 if (!is_dtl_page_shared(page)) { 80 dtl_page_store[dtl_nr_pages] = page; 81 dtl_nr_pages++; 82 WARN_ON(dtl_nr_pages >= NR_DTL_PAGE); 83 uv_share_page(pfn, 1); 84 } 85 } 86