95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
// 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 <khandual@linux.vnet.ibm.com>
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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 <linux/cc_platform.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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ppc_swiotlb_flags |= SWIOTLB_ANY | 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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int set_memory_encrypted(unsigned long addr, int numpages)
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{
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if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
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return 0;
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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 (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
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return 0;
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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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