mirror of
https://github.com/torvalds/linux
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4e8c0c8c4b
Make the IOCTL_PRIVCMD_MMAPBATCH_V2 (and older V1 version) map
multiple frames at a time rather than one at a time, despite the pages
being non-consecutive GFNs.
xen_remap_foreign_mfn_array() is added which maps an array of GFNs
(instead of a consecutive range of GFNs).
Since per-frame errors are returned in an array, privcmd must set the
MMAPBATCH_V1 error bits as part of the "report errors" phase, after
all the frames are mapped.
Migrate times are significantly improved (when using a PV toolstack
domain). For example, for an idle 12 GiB PV guest:
Before After
real 0m38.179s 0m26.868s
user 0m15.096s 0m13.652s
sys 0m28.988s 0m18.732s
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
143 lines
4.1 KiB
C
143 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 fgmfn of domid to lpfn in the current domain */
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static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
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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 = fgmfn;
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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 *fgmfn; /* foreign domain's gmfn */
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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_mfn_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->fgmfn, 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->fgmfn++;
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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 *mfn, 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.fgmfn = mfn;
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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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