265 строки
7.1 KiB
C
265 строки
7.1 KiB
C
/*
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* MMU operations common to all auto-translated physmap guests.
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*
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* Copyright (C) 2015 Citrix Systems R&D Ltd.
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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/kernel.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 <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
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#include <xen/page.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/memory.h>
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#include <xen/balloon.h>
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typedef void (*xen_gfn_fn_t)(unsigned long gfn, void *data);
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/* Break down the pages in 4KB chunk and call fn for each gfn */
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static void xen_for_each_gfn(struct page **pages, unsigned nr_gfn,
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xen_gfn_fn_t fn, void *data)
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{
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unsigned long xen_pfn = 0;
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struct page *page;
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int i;
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for (i = 0; i < nr_gfn; i++) {
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if ((i % XEN_PFN_PER_PAGE) == 0) {
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page = pages[i / XEN_PFN_PER_PAGE];
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xen_pfn = page_to_xen_pfn(page);
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}
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fn(pfn_to_gfn(xen_pfn++), data);
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}
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}
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struct remap_data {
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xen_pfn_t *fgfn; /* foreign domain's gfn */
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int nr_fgfn; /* Number of foreign gfn left to map */
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pgprot_t prot;
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domid_t domid;
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struct vm_area_struct *vma;
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int index;
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struct page **pages;
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struct xen_remap_gfn_info *info;
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int *err_ptr;
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int mapped;
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/* Hypercall parameters */
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int h_errs[XEN_PFN_PER_PAGE];
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xen_ulong_t h_idxs[XEN_PFN_PER_PAGE];
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xen_pfn_t h_gpfns[XEN_PFN_PER_PAGE];
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int h_iter; /* Iterator */
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};
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static void setup_hparams(unsigned long gfn, void *data)
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{
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struct remap_data *info = data;
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info->h_idxs[info->h_iter] = *info->fgfn;
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info->h_gpfns[info->h_iter] = gfn;
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info->h_errs[info->h_iter] = 0;
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info->h_iter++;
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info->fgfn++;
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}
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static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
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void *data)
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{
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struct remap_data *info = data;
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struct page *page = info->pages[info->index++];
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pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), info->prot));
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int rc, nr_gfn;
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uint32_t i;
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struct xen_add_to_physmap_range xatp = {
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.domid = DOMID_SELF,
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.foreign_domid = info->domid,
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.space = XENMAPSPACE_gmfn_foreign,
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};
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nr_gfn = min_t(typeof(info->nr_fgfn), XEN_PFN_PER_PAGE, info->nr_fgfn);
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info->nr_fgfn -= nr_gfn;
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info->h_iter = 0;
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xen_for_each_gfn(&page, nr_gfn, setup_hparams, info);
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BUG_ON(info->h_iter != nr_gfn);
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set_xen_guest_handle(xatp.idxs, info->h_idxs);
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set_xen_guest_handle(xatp.gpfns, info->h_gpfns);
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set_xen_guest_handle(xatp.errs, info->h_errs);
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xatp.size = nr_gfn;
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rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
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/* info->err_ptr expect to have one error status per Xen PFN */
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for (i = 0; i < nr_gfn; i++) {
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int err = (rc < 0) ? rc : info->h_errs[i];
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*(info->err_ptr++) = err;
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if (!err)
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info->mapped++;
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}
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/*
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* Note: The hypercall will return 0 in most of the case if even if
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* all the fgmfn are not mapped. We still have to update the pte
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* as the userspace may decide to continue.
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*/
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if (!rc)
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set_pte_at(info->vma->vm_mm, addr, ptep, pte);
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return 0;
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}
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int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *gfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned domid,
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struct page **pages)
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{
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int err;
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struct remap_data data;
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unsigned long range = DIV_ROUND_UP(nr, XEN_PFN_PER_PAGE) << PAGE_SHIFT;
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/* Kept here for the purpose of making sure code doesn't break
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x86 PVOPS */
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BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
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data.fgfn = gfn;
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data.nr_fgfn = nr;
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data.prot = prot;
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data.domid = domid;
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data.vma = vma;
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data.pages = pages;
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data.index = 0;
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data.err_ptr = err_ptr;
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data.mapped = 0;
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err = apply_to_page_range(vma->vm_mm, addr, range,
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remap_pte_fn, &data);
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return err < 0 ? err : data.mapped;
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}
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EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_array);
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static void unmap_gfn(unsigned long gfn, void *data)
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{
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struct xen_remove_from_physmap xrp;
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xrp.domid = DOMID_SELF;
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xrp.gpfn = gfn;
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(void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
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}
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int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
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int nr, struct page **pages)
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{
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xen_for_each_gfn(pages, nr, unmap_gfn, NULL);
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return 0;
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}
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EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);
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struct map_balloon_pages {
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xen_pfn_t *pfns;
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unsigned int idx;
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};
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static void setup_balloon_gfn(unsigned long gfn, void *data)
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{
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struct map_balloon_pages *info = data;
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info->pfns[info->idx++] = gfn;
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}
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/**
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* xen_xlate_map_ballooned_pages - map a new set of ballooned pages
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* @gfns: returns the array of corresponding GFNs
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* @virt: returns the virtual address of the mapped region
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* @nr_grant_frames: number of GFNs
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* @return 0 on success, error otherwise
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*
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* This allocates a set of ballooned pages and maps them into the
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* kernel's address space.
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*/
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int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
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unsigned long nr_grant_frames)
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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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struct map_balloon_pages data;
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int rc;
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unsigned long nr_pages;
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BUG_ON(nr_grant_frames == 0);
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nr_pages = DIV_ROUND_UP(nr_grant_frames, XEN_PFN_PER_PAGE);
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pages = kcalloc(nr_pages, 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_pages, pages);
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if (rc) {
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pr_warn("%s Couldn't balloon alloc %ld pages rc:%d\n", __func__,
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nr_pages, 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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data.pfns = pfns;
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data.idx = 0;
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xen_for_each_gfn(pages, nr_grant_frames, setup_balloon_gfn, &data);
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vaddr = vmap(pages, nr_pages, 0, PAGE_KERNEL);
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if (!vaddr) {
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pr_warn("%s Couldn't map %ld pages rc:%d\n", __func__,
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nr_pages, rc);
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free_xenballooned_pages(nr_pages, 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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*gfns = pfns;
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*virt = vaddr;
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return 0;
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}
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EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
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