176 lines
4.8 KiB
C
176 lines
4.8 KiB
C
/******************************************************************************
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* grant_table.c
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* x86 specific part
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*
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* Granting foreign access to our memory reservation.
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*
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* Copyright (c) 2005-2006, Christopher Clark
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* Copyright (c) 2004-2005, K A Fraser
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* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan. Split out x86 specific part.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <xen/interface/xen.h>
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#include <xen/page.h>
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#include <xen/grant_table.h>
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#include <xen/xen.h>
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#include <asm/pgtable.h>
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static struct gnttab_vm_area {
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struct vm_struct *area;
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pte_t **ptes;
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} gnttab_shared_vm_area;
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int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
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unsigned long max_nr_gframes,
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void **__shared)
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{
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void *shared = *__shared;
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unsigned long addr;
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unsigned long i;
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if (shared == NULL)
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*__shared = shared = gnttab_shared_vm_area.area->addr;
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addr = (unsigned long)shared;
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for (i = 0; i < nr_gframes; i++) {
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set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i],
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mfn_pte(frames[i], PAGE_KERNEL));
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addr += PAGE_SIZE;
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}
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return 0;
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}
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void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
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{
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unsigned long addr;
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unsigned long i;
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addr = (unsigned long)shared;
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for (i = 0; i < nr_gframes; i++) {
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set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i],
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__pte(0));
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addr += PAGE_SIZE;
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}
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}
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static int arch_gnttab_valloc(struct gnttab_vm_area *area, unsigned nr_frames)
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{
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area->ptes = kmalloc(sizeof(pte_t *) * nr_frames, GFP_KERNEL);
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if (area->ptes == NULL)
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return -ENOMEM;
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area->area = alloc_vm_area(PAGE_SIZE * nr_frames, area->ptes);
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if (area->area == NULL) {
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kfree(area->ptes);
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return -ENOMEM;
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}
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return 0;
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}
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int arch_gnttab_init(unsigned long nr_shared)
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{
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if (!xen_pv_domain())
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return 0;
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return arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
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}
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#ifdef CONFIG_XEN_PVH
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#include <xen/balloon.h>
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#include <xen/events.h>
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#include <linux/slab.h>
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static int __init xlated_setup_gnttab_pages(void)
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{
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struct page **pages;
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xen_pfn_t *pfns;
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void *vaddr;
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int rc;
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unsigned int i;
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unsigned long nr_grant_frames = gnttab_max_grant_frames();
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BUG_ON(nr_grant_frames == 0);
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pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
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if (!pages)
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return -ENOMEM;
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pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
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if (!pfns) {
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kfree(pages);
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return -ENOMEM;
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}
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rc = alloc_xenballooned_pages(nr_grant_frames, pages);
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if (rc) {
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pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
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nr_grant_frames, rc);
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kfree(pages);
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kfree(pfns);
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return rc;
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}
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for (i = 0; i < nr_grant_frames; i++)
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pfns[i] = page_to_pfn(pages[i]);
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vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
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if (!vaddr) {
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pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
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nr_grant_frames, rc);
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free_xenballooned_pages(nr_grant_frames, pages);
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kfree(pages);
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kfree(pfns);
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return -ENOMEM;
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}
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kfree(pages);
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xen_auto_xlat_grant_frames.pfn = pfns;
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xen_auto_xlat_grant_frames.count = nr_grant_frames;
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xen_auto_xlat_grant_frames.vaddr = vaddr;
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return 0;
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}
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static int __init xen_pvh_gnttab_setup(void)
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{
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if (!xen_pvh_domain())
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return -ENODEV;
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return xlated_setup_gnttab_pages();
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}
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/* Call it _before_ __gnttab_init as we need to initialize the
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* xen_auto_xlat_grant_frames first. */
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core_initcall(xen_pvh_gnttab_setup);
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#endif
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