a13d7201d7
The privcmd code is mixing the usage of GFN and MFN within the same functions which make the code difficult to understand when you only work with auto-translated guests. The privcmd driver is only dealing with GFN so replace all the mention of MFN into GFN. The ioctl structure used to map foreign change has been left unchanged given that the userspace is using it. Nonetheless, add a comment to explain the expected value within the "mfn" field. Signed-off-by: Julien Grall <julien.grall@citrix.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
144 lines
4.1 KiB
C
144 lines
4.1 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 <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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/* map fgfn of domid to lpfn in the current domain */
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static int map_foreign_page(unsigned long lpfn, unsigned long fgfn,
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unsigned int domid)
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{
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int rc;
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struct xen_add_to_physmap_range xatp = {
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.domid = DOMID_SELF,
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.foreign_domid = domid,
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.size = 1,
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.space = XENMAPSPACE_gmfn_foreign,
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};
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xen_ulong_t idx = fgfn;
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xen_pfn_t gpfn = lpfn;
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int err = 0;
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set_xen_guest_handle(xatp.idxs, &idx);
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set_xen_guest_handle(xatp.gpfns, &gpfn);
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set_xen_guest_handle(xatp.errs, &err);
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rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
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return rc < 0 ? rc : err;
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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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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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};
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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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unsigned long pfn = page_to_pfn(page);
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pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
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int rc;
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rc = map_foreign_page(pfn, *info->fgfn, info->domid);
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*info->err_ptr++ = rc;
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if (!rc) {
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set_pte_at(info->vma->vm_mm, addr, ptep, pte);
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info->mapped++;
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}
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info->fgfn++;
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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 = nr << 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.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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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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int i;
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for (i = 0; i < nr; i++) {
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struct xen_remove_from_physmap xrp;
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unsigned long pfn;
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pfn = page_to_pfn(pages[i]);
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xrp.domid = DOMID_SELF;
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xrp.gpfn = pfn;
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(void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
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}
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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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