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xen/balloon: Share common memory reservation routines
Memory {increase|decrease}_reservation and VA mappings update/reset
code used in balloon driver can be made common, so other drivers can
also re-use the same functionality without open-coding.
Create a dedicated file for the shared code and export corresponding
symbols for other kernel modules.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>- Loading branch information
Oleksandr Andrushchenko
authored and
Boris Ostrovsky
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Jul 27, 2018
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,118 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
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| /****************************************************************************** | ||
| * Xen memory reservation utilities. | ||
| * | ||
| * Copyright (c) 2003, B Dragovic | ||
| * Copyright (c) 2003-2004, M Williamson, K Fraser | ||
| * Copyright (c) 2005 Dan M. Smith, IBM Corporation | ||
| * Copyright (c) 2010 Daniel Kiper | ||
| * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc. | ||
| */ | ||
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| #include <asm/xen/hypercall.h> | ||
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| #include <xen/interface/memory.h> | ||
| #include <xen/mem-reservation.h> | ||
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| /* | ||
| * Use one extent per PAGE_SIZE to avoid to break down the page into | ||
| * multiple frame. | ||
| */ | ||
| #define EXTENT_ORDER (fls(XEN_PFN_PER_PAGE) - 1) | ||
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| #ifdef CONFIG_XEN_HAVE_PVMMU | ||
| void __xenmem_reservation_va_mapping_update(unsigned long count, | ||
| struct page **pages, | ||
| xen_pfn_t *frames) | ||
| { | ||
| int i; | ||
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| for (i = 0; i < count; i++) { | ||
| struct page *page = pages[i]; | ||
| unsigned long pfn = page_to_pfn(page); | ||
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| BUG_ON(!page); | ||
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| /* | ||
| * We don't support PV MMU when Linux and Xen is using | ||
| * different page granularity. | ||
| */ | ||
| BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); | ||
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| set_phys_to_machine(pfn, frames[i]); | ||
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| /* Link back into the page tables if not highmem. */ | ||
| if (!PageHighMem(page)) { | ||
| int ret; | ||
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| ret = HYPERVISOR_update_va_mapping( | ||
| (unsigned long)__va(pfn << PAGE_SHIFT), | ||
| mfn_pte(frames[i], PAGE_KERNEL), | ||
| 0); | ||
| BUG_ON(ret); | ||
| } | ||
| } | ||
| } | ||
| EXPORT_SYMBOL_GPL(__xenmem_reservation_va_mapping_update); | ||
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| void __xenmem_reservation_va_mapping_reset(unsigned long count, | ||
| struct page **pages) | ||
| { | ||
| int i; | ||
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| for (i = 0; i < count; i++) { | ||
| struct page *page = pages[i]; | ||
| unsigned long pfn = page_to_pfn(page); | ||
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| /* | ||
| * We don't support PV MMU when Linux and Xen are using | ||
| * different page granularity. | ||
| */ | ||
| BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); | ||
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| if (!PageHighMem(page)) { | ||
| int ret; | ||
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| ret = HYPERVISOR_update_va_mapping( | ||
| (unsigned long)__va(pfn << PAGE_SHIFT), | ||
| __pte_ma(0), 0); | ||
| BUG_ON(ret); | ||
| } | ||
| __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); | ||
| } | ||
| } | ||
| EXPORT_SYMBOL_GPL(__xenmem_reservation_va_mapping_reset); | ||
| #endif /* CONFIG_XEN_HAVE_PVMMU */ | ||
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| /* @frames is an array of PFNs */ | ||
| int xenmem_reservation_increase(int count, xen_pfn_t *frames) | ||
| { | ||
| struct xen_memory_reservation reservation = { | ||
| .address_bits = 0, | ||
| .extent_order = EXTENT_ORDER, | ||
| .domid = DOMID_SELF | ||
| }; | ||
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| /* XENMEM_populate_physmap requires a PFN based on Xen granularity. */ | ||
| set_xen_guest_handle(reservation.extent_start, frames); | ||
| reservation.nr_extents = count; | ||
| return HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation); | ||
| } | ||
| EXPORT_SYMBOL_GPL(xenmem_reservation_increase); | ||
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| /* @frames is an array of GFNs */ | ||
| int xenmem_reservation_decrease(int count, xen_pfn_t *frames) | ||
| { | ||
| struct xen_memory_reservation reservation = { | ||
| .address_bits = 0, | ||
| .extent_order = EXTENT_ORDER, | ||
| .domid = DOMID_SELF | ||
| }; | ||
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| /* XENMEM_decrease_reservation requires a GFN */ | ||
| set_xen_guest_handle(reservation.extent_start, frames); | ||
| reservation.nr_extents = count; | ||
| return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation); | ||
| } | ||
| EXPORT_SYMBOL_GPL(xenmem_reservation_decrease); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0 */ | ||
|
|
||
| /* | ||
| * Xen memory reservation utilities. | ||
| * | ||
| * Copyright (c) 2003, B Dragovic | ||
| * Copyright (c) 2003-2004, M Williamson, K Fraser | ||
| * Copyright (c) 2005 Dan M. Smith, IBM Corporation | ||
| * Copyright (c) 2010 Daniel Kiper | ||
| * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc. | ||
| */ | ||
|
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| #ifndef _XENMEM_RESERVATION_H | ||
| #define _XENMEM_RESERVATION_H | ||
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| #include <linux/highmem.h> | ||
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| #include <xen/page.h> | ||
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| static inline void xenmem_reservation_scrub_page(struct page *page) | ||
| { | ||
| #ifdef CONFIG_XEN_SCRUB_PAGES | ||
| clear_highpage(page); | ||
| #endif | ||
| } | ||
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| #ifdef CONFIG_XEN_HAVE_PVMMU | ||
| void __xenmem_reservation_va_mapping_update(unsigned long count, | ||
| struct page **pages, | ||
| xen_pfn_t *frames); | ||
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| void __xenmem_reservation_va_mapping_reset(unsigned long count, | ||
| struct page **pages); | ||
| #endif | ||
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| static inline void xenmem_reservation_va_mapping_update(unsigned long count, | ||
| struct page **pages, | ||
| xen_pfn_t *frames) | ||
| { | ||
| #ifdef CONFIG_XEN_HAVE_PVMMU | ||
| if (!xen_feature(XENFEAT_auto_translated_physmap)) | ||
| __xenmem_reservation_va_mapping_update(count, pages, frames); | ||
| #endif | ||
| } | ||
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| static inline void xenmem_reservation_va_mapping_reset(unsigned long count, | ||
| struct page **pages) | ||
| { | ||
| #ifdef CONFIG_XEN_HAVE_PVMMU | ||
| if (!xen_feature(XENFEAT_auto_translated_physmap)) | ||
| __xenmem_reservation_va_mapping_reset(count, pages); | ||
| #endif | ||
| } | ||
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| int xenmem_reservation_increase(int count, xen_pfn_t *frames); | ||
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| int xenmem_reservation_decrease(int count, xen_pfn_t *frames); | ||
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| #endif |