projects / linux-2.6-block.git / blame
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| ae4c51a5 OA |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | /****************************************************************************** | |
| 4 | * Xen memory reservation utilities. | |
| 5 | * | |
| 6 | * Copyright (c) 2003, B Dragovic | |
| 7 | * Copyright (c) 2003-2004, M Williamson, K Fraser | |
| 8 | * Copyright (c) 2005 Dan M. Smith, IBM Corporation | |
| 9 | * Copyright (c) 2010 Daniel Kiper | |
| 10 | * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <asm/xen/hypercall.h> | |
| 14 | ||
| 15 | #include <xen/interface/memory.h> | |
| 16 | #include <xen/mem-reservation.h> | |
| 17 | ||
| 18 | /* | |
| 19 | * Use one extent per PAGE_SIZE to avoid to break down the page into | |
| 20 | * multiple frame. | |
| 21 | */ | |
| 22 | #define EXTENT_ORDER (fls(XEN_PFN_PER_PAGE) - 1) | |
| 23 | ||
| 24 | #ifdef CONFIG_XEN_HAVE_PVMMU | |
| 25 | void __xenmem_reservation_va_mapping_update(unsigned long count, | |
| 26 | struct page **pages, | |
| 27 | xen_pfn_t *frames) | |
| 28 | { | |
| 29 | int i; | |
| 30 | ||
| 31 | for (i = 0; i < count; i++) { | |
| 32 | struct page *page = pages[i]; | |
| 33 | unsigned long pfn = page_to_pfn(page); | |
| 34 | ||
| 35 | BUG_ON(!page); | |
| 36 | ||
| 37 | /* | |
| 38 | * We don't support PV MMU when Linux and Xen is using | |
| 39 | * different page granularity. | |
| 40 | */ | |
| 41 | BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); | |
| 42 | ||
| 43 | set_phys_to_machine(pfn, frames[i]); | |
| 44 | ||
| 45 | /* Link back into the page tables if not highmem. */ | |
| 46 | if (!PageHighMem(page)) { | |
| 47 | int ret; | |
| 48 | ||
| 49 | ret = HYPERVISOR_update_va_mapping( | |
| 50 | (unsigned long)__va(pfn << PAGE_SHIFT), | |
| 51 | mfn_pte(frames[i], PAGE_KERNEL), | |
| 52 | 0); | |
| 53 | BUG_ON(ret); | |
| 54 | } | |
| 55 | } | |
| 56 | } | |
| 57 | EXPORT_SYMBOL_GPL(__xenmem_reservation_va_mapping_update); | |
| 58 | ||
| 59 | void __xenmem_reservation_va_mapping_reset(unsigned long count, | |
| 60 | struct page **pages) | |
| 61 | { | |
| 62 | int i; | |
| 63 | ||
| 64 | for (i = 0; i < count; i++) { | |
| 65 | struct page *page = pages[i]; | |
| 66 | unsigned long pfn = page_to_pfn(page); | |
| 67 | ||
| 68 | /* | |
| 69 | * We don't support PV MMU when Linux and Xen are using | |
| 70 | * different page granularity. | |
| 71 | */ | |
| 72 | BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); | |
| 73 | ||
| 74 | if (!PageHighMem(page)) { | |
| 75 | int ret; | |
| 76 | ||
| 77 | ret = HYPERVISOR_update_va_mapping( | |
| 78 | (unsigned long)__va(pfn << PAGE_SHIFT), | |
| 79 | __pte_ma(0), 0); | |
| 80 | BUG_ON(ret); | |
| 81 | } | |
| 82 | __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); | |
| 83 | } | |
| 84 | } | |
| 85 | EXPORT_SYMBOL_GPL(__xenmem_reservation_va_mapping_reset); | |
| 86 | #endif /* CONFIG_XEN_HAVE_PVMMU */ | |
| 87 | ||
| 88 | /* @frames is an array of PFNs */ | |
| 89 | int xenmem_reservation_increase(int count, xen_pfn_t *frames) | |
| 90 | { | |
| 91 | struct xen_memory_reservation reservation = { | |
| 92 | .address_bits = 0, | |
| 93 | .extent_order = EXTENT_ORDER, | |
| 94 | .domid = DOMID_SELF | |
| 95 | }; | |
| 96 | ||
| 97 | /* XENMEM_populate_physmap requires a PFN based on Xen granularity. */ | |
| 98 | set_xen_guest_handle(reservation.extent_start, frames); | |
| 99 | reservation.nr_extents = count; | |
| 100 | return HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation); | |
| 101 | } | |
| 102 | EXPORT_SYMBOL_GPL(xenmem_reservation_increase); | |
| 103 | ||
| 104 | /* @frames is an array of GFNs */ | |
| 105 | int xenmem_reservation_decrease(int count, xen_pfn_t *frames) | |
| 106 | { | |
| 107 | struct xen_memory_reservation reservation = { | |
| 108 | .address_bits = 0, | |
| 109 | .extent_order = EXTENT_ORDER, | |
| 110 | .domid = DOMID_SELF | |
| 111 | }; | |
| 112 | ||
| 113 | /* XENMEM_decrease_reservation requires a GFN */ | |
| 114 | set_xen_guest_handle(reservation.extent_start, frames); | |
| 115 | reservation.nr_extents = count; | |
| 116 | return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation); | |
| 117 | } | |
| 118 | EXPORT_SYMBOL_GPL(xenmem_reservation_decrease); |