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112 lines
2.5 KiB
112 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Secure VM platform |
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* |
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* Copyright 2018 IBM Corporation |
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* Author: Anshuman Khandual <[email protected]> |
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*/ |
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#include <linux/mm.h> |
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#include <linux/memblock.h> |
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#include <asm/machdep.h> |
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#include <asm/svm.h> |
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#include <asm/swiotlb.h> |
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#include <asm/ultravisor.h> |
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#include <asm/dtl.h> |
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static int __init init_svm(void) |
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{ |
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if (!is_secure_guest()) |
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return 0; |
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/* Don't release the SWIOTLB buffer. */ |
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ppc_swiotlb_enable = 1; |
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/* |
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* Since the guest memory is inaccessible to the host, devices always |
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* need to use the SWIOTLB buffer for DMA even if dma_capable() says |
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* otherwise. |
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*/ |
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swiotlb_force = SWIOTLB_FORCE; |
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/* Share the SWIOTLB buffer with the host. */ |
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swiotlb_update_mem_attributes(); |
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return 0; |
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} |
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machine_early_initcall(pseries, init_svm); |
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/* |
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* Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it |
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* can allocate the buffer anywhere in memory. Since the hypervisor doesn't have |
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* any addressing limitation, we don't need to allocate it in low addresses. |
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*/ |
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void __init svm_swiotlb_init(void) |
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{ |
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unsigned char *vstart; |
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unsigned long bytes, io_tlb_nslabs; |
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io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT); |
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io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
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bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
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vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE); |
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if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false)) |
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return; |
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if (io_tlb_start) |
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memblock_free_early(io_tlb_start, |
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PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); |
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panic("SVM: Cannot allocate SWIOTLB buffer"); |
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} |
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int set_memory_encrypted(unsigned long addr, int numpages) |
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{ |
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if (!PAGE_ALIGNED(addr)) |
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return -EINVAL; |
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uv_unshare_page(PHYS_PFN(__pa(addr)), numpages); |
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return 0; |
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} |
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int set_memory_decrypted(unsigned long addr, int numpages) |
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{ |
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if (!PAGE_ALIGNED(addr)) |
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return -EINVAL; |
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uv_share_page(PHYS_PFN(__pa(addr)), numpages); |
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return 0; |
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} |
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/* There's one dispatch log per CPU. */ |
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#define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE) |
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static struct page *dtl_page_store[NR_DTL_PAGE]; |
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static long dtl_nr_pages; |
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static bool is_dtl_page_shared(struct page *page) |
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{ |
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long i; |
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for (i = 0; i < dtl_nr_pages; i++) |
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if (dtl_page_store[i] == page) |
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return true; |
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return false; |
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} |
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void dtl_cache_ctor(void *addr) |
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{ |
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unsigned long pfn = PHYS_PFN(__pa(addr)); |
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struct page *page = pfn_to_page(pfn); |
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if (!is_dtl_page_shared(page)) { |
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dtl_page_store[dtl_nr_pages] = page; |
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dtl_nr_pages++; |
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WARN_ON(dtl_nr_pages >= NR_DTL_PAGE); |
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uv_share_page(pfn, 1); |
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} |
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}
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