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/usr/src/linux-headers-5.15.0-179/include/xen/

Edit File: xen-front-pgdir-shbuf.h

/* SPDX-License-Identifier: GPL-2.0 OR MIT */

/*
 * Xen frontend/backend page directory based shared buffer
 * helper module.
 *
 * Copyright (C) 2018 EPAM Systems Inc.
 *
 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
 */

#ifndef __XEN_FRONT_PGDIR_SHBUF_H_
#define __XEN_FRONT_PGDIR_SHBUF_H_

#include <linux/kernel.h>

#include <xen/grant_table.h>

struct xen_front_pgdir_shbuf_ops;

struct xen_front_pgdir_shbuf {
	/*
	 * Number of references granted for the backend use:
	 *
	 *  - for frontend allocated/imported buffers this holds the number
	 *    of grant references for the page directory and the pages
	 *    of the buffer
	 *
	 *  - for the buffer provided by the backend this only holds the number
	 *    of grant references for the page directory itself as grant
	 *    references for the buffer will be provided by the backend.
	 */
	int num_grefs;
	grant_ref_t *grefs;
	/* Page directory backing storage. */
	u8 *directory;

/*
	 * Number of pages for the shared buffer itself (excluding the page
	 * directory).
	 */
	int num_pages;
	/*
	 * Backing storage of the shared buffer: these are the pages being
	 * shared.
	 */
	struct page **pages;

struct xenbus_device *xb_dev;

/* These are the ops used internally depending on be_alloc mode. */
	const struct xen_front_pgdir_shbuf_ops *ops;

/* Xen map handles for the buffer allocated by the backend. */
	grant_handle_t *backend_map_handles;
};

struct xen_front_pgdir_shbuf_cfg {
	struct xenbus_device *xb_dev;

/* Number of pages of the buffer backing storage. */
	int num_pages;
	/* Pages of the buffer to be shared. */
	struct page **pages;

/*
	 * This is allocated outside because there are use-cases when
	 * the buffer structure is allocated as a part of a bigger one.
	 */
	struct xen_front_pgdir_shbuf *pgdir;
	/*
	 * Mode of grant reference sharing: if set then backend will share
	 * grant references to the buffer with the frontend.
	 */
	int be_alloc;
};

int xen_front_pgdir_shbuf_alloc(struct xen_front_pgdir_shbuf_cfg *cfg);

grant_ref_t
xen_front_pgdir_shbuf_get_dir_start(struct xen_front_pgdir_shbuf *buf);

int xen_front_pgdir_shbuf_map(struct xen_front_pgdir_shbuf *buf);

int xen_front_pgdir_shbuf_unmap(struct xen_front_pgdir_shbuf *buf);

void xen_front_pgdir_shbuf_free(struct xen_front_pgdir_shbuf *buf);

#endif /* __XEN_FRONT_PGDIR_SHBUF_H_ */

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Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
acpi.h	2.52 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
arm	DIR	20.05.2026 06:02:08	0/0	drwxr-xr-x	Edit Rename
balloon.h	1.02 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
events.h	4.72 KB	05.05.2026 13:53:28	0/0	-rw-r--r--	Edit Rename Download
features.h	502 B	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
grant_table.h	11.33 KB	05.05.2026 13:53:28	0/0	-rw-r--r--	Edit Rename Download
hvc-console.h	518 B	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
hvm.h	1.33 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
interface	DIR	20.05.2026 06:02:08	0/0	drwxr-xr-x	Edit Rename
mem-reservation.h	1.49 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
page.h	1.29 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
platform_pci.h	2.04 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
swiotlb-xen.h	553 B	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
xen-front-pgdir-shbuf.h	2.31 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
xen-ops.h	6.59 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
xen.h	1.88 KB	05.05.2026 13:53:28	0/0	-rw-r--r--	Edit Rename Download
xenbus.h	8.62 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download
xenbus_dev.h	1.8 KB	31.10.2021 20:53:10	0/0	-rw-r--r--	Edit Rename Download

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