/*
|
* MMU operations common to all auto-translated physmap guests.
|
*
|
* Copyright (C) 2015 Citrix Systems R&D Ltd.
|
*
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License version 2
|
* as published by the Free Software Foundation; or, when distributed
|
* separately from the Linux kernel or incorporated into other
|
* software packages, subject to the following license:
|
*
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
* of this source file (the "Software"), to deal in the Software without
|
* restriction, including without limitation the rights to use, copy, modify,
|
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
* and to permit persons to whom the Software is furnished to do so, subject to
|
* the following conditions:
|
*
|
* The above copyright notice and this permission notice shall be included in
|
* all copies or substantial portions of the Software.
|
*
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
* IN THE SOFTWARE.
|
*/
|
#include <linux/kernel.h>
|
#include <linux/mm.h>
|
#include <linux/slab.h>
|
#include <linux/vmalloc.h>
|
|
#include <asm/xen/hypercall.h>
|
#include <asm/xen/hypervisor.h>
|
|
#include <xen/xen.h>
|
#include <xen/xen-ops.h>
|
#include <xen/page.h>
|
#include <xen/interface/xen.h>
|
#include <xen/interface/memory.h>
|
#include <xen/balloon.h>
|
|
typedef void (*xen_gfn_fn_t)(unsigned long gfn, void *data);
|
|
/* Break down the pages in 4KB chunk and call fn for each gfn */
|
static void xen_for_each_gfn(struct page **pages, unsigned nr_gfn,
|
xen_gfn_fn_t fn, void *data)
|
{
|
unsigned long xen_pfn = 0;
|
struct page *page;
|
int i;
|
|
for (i = 0; i < nr_gfn; i++) {
|
if ((i % XEN_PFN_PER_PAGE) == 0) {
|
page = pages[i / XEN_PFN_PER_PAGE];
|
xen_pfn = page_to_xen_pfn(page);
|
}
|
fn(pfn_to_gfn(xen_pfn++), data);
|
}
|
}
|
|
struct remap_data {
|
xen_pfn_t *fgfn; /* foreign domain's gfn */
|
int nr_fgfn; /* Number of foreign gfn left to map */
|
pgprot_t prot;
|
domid_t domid;
|
struct vm_area_struct *vma;
|
int index;
|
struct page **pages;
|
struct xen_remap_gfn_info *info;
|
int *err_ptr;
|
int mapped;
|
|
/* Hypercall parameters */
|
int h_errs[XEN_PFN_PER_PAGE];
|
xen_ulong_t h_idxs[XEN_PFN_PER_PAGE];
|
xen_pfn_t h_gpfns[XEN_PFN_PER_PAGE];
|
|
int h_iter; /* Iterator */
|
};
|
|
static void setup_hparams(unsigned long gfn, void *data)
|
{
|
struct remap_data *info = data;
|
|
info->h_idxs[info->h_iter] = *info->fgfn;
|
info->h_gpfns[info->h_iter] = gfn;
|
info->h_errs[info->h_iter] = 0;
|
|
info->h_iter++;
|
info->fgfn++;
|
}
|
|
static int remap_pte_fn(pte_t *ptep, unsigned long addr, void *data)
|
{
|
struct remap_data *info = data;
|
struct page *page = info->pages[info->index++];
|
pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), info->prot));
|
int rc, nr_gfn;
|
uint32_t i;
|
struct xen_add_to_physmap_range xatp = {
|
.domid = DOMID_SELF,
|
.foreign_domid = info->domid,
|
.space = XENMAPSPACE_gmfn_foreign,
|
};
|
|
nr_gfn = min_t(typeof(info->nr_fgfn), XEN_PFN_PER_PAGE, info->nr_fgfn);
|
info->nr_fgfn -= nr_gfn;
|
|
info->h_iter = 0;
|
xen_for_each_gfn(&page, nr_gfn, setup_hparams, info);
|
BUG_ON(info->h_iter != nr_gfn);
|
|
set_xen_guest_handle(xatp.idxs, info->h_idxs);
|
set_xen_guest_handle(xatp.gpfns, info->h_gpfns);
|
set_xen_guest_handle(xatp.errs, info->h_errs);
|
xatp.size = nr_gfn;
|
|
rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
|
|
/* info->err_ptr expect to have one error status per Xen PFN */
|
for (i = 0; i < nr_gfn; i++) {
|
int err = (rc < 0) ? rc : info->h_errs[i];
|
|
*(info->err_ptr++) = err;
|
if (!err)
|
info->mapped++;
|
}
|
|
/*
|
* Note: The hypercall will return 0 in most of the case if even if
|
* all the fgmfn are not mapped. We still have to update the pte
|
* as the userspace may decide to continue.
|
*/
|
if (!rc)
|
set_pte_at(info->vma->vm_mm, addr, ptep, pte);
|
|
return 0;
|
}
|
|
int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
|
unsigned long addr,
|
xen_pfn_t *gfn, int nr,
|
int *err_ptr, pgprot_t prot,
|
unsigned domid,
|
struct page **pages)
|
{
|
int err;
|
struct remap_data data;
|
unsigned long range = DIV_ROUND_UP(nr, XEN_PFN_PER_PAGE) << PAGE_SHIFT;
|
|
/* Kept here for the purpose of making sure code doesn't break
|
x86 PVOPS */
|
BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
|
|
data.fgfn = gfn;
|
data.nr_fgfn = nr;
|
data.prot = prot;
|
data.domid = domid;
|
data.vma = vma;
|
data.pages = pages;
|
data.index = 0;
|
data.err_ptr = err_ptr;
|
data.mapped = 0;
|
|
err = apply_to_page_range(vma->vm_mm, addr, range,
|
remap_pte_fn, &data);
|
return err < 0 ? err : data.mapped;
|
}
|
EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_array);
|
|
static void unmap_gfn(unsigned long gfn, void *data)
|
{
|
struct xen_remove_from_physmap xrp;
|
|
xrp.domid = DOMID_SELF;
|
xrp.gpfn = gfn;
|
(void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
|
}
|
|
int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
|
int nr, struct page **pages)
|
{
|
xen_for_each_gfn(pages, nr, unmap_gfn, NULL);
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);
|
|
struct map_balloon_pages {
|
xen_pfn_t *pfns;
|
unsigned int idx;
|
};
|
|
static void setup_balloon_gfn(unsigned long gfn, void *data)
|
{
|
struct map_balloon_pages *info = data;
|
|
info->pfns[info->idx++] = gfn;
|
}
|
|
/**
|
* xen_xlate_map_ballooned_pages - map a new set of ballooned pages
|
* @gfns: returns the array of corresponding GFNs
|
* @virt: returns the virtual address of the mapped region
|
* @nr_grant_frames: number of GFNs
|
* @return 0 on success, error otherwise
|
*
|
* This allocates a set of ballooned pages and maps them into the
|
* kernel's address space.
|
*/
|
int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
|
unsigned long nr_grant_frames)
|
{
|
struct page **pages;
|
xen_pfn_t *pfns;
|
void *vaddr;
|
struct map_balloon_pages data;
|
int rc;
|
unsigned long nr_pages;
|
|
BUG_ON(nr_grant_frames == 0);
|
nr_pages = DIV_ROUND_UP(nr_grant_frames, XEN_PFN_PER_PAGE);
|
pages = kcalloc(nr_pages, sizeof(pages[0]), GFP_KERNEL);
|
if (!pages)
|
return -ENOMEM;
|
|
pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
|
if (!pfns) {
|
kfree(pages);
|
return -ENOMEM;
|
}
|
rc = xen_alloc_unpopulated_pages(nr_pages, pages);
|
if (rc) {
|
pr_warn("%s Couldn't balloon alloc %ld pages rc:%d\n", __func__,
|
nr_pages, rc);
|
kfree(pages);
|
kfree(pfns);
|
return rc;
|
}
|
|
data.pfns = pfns;
|
data.idx = 0;
|
xen_for_each_gfn(pages, nr_grant_frames, setup_balloon_gfn, &data);
|
|
vaddr = vmap(pages, nr_pages, 0, PAGE_KERNEL);
|
if (!vaddr) {
|
pr_warn("%s Couldn't map %ld pages rc:%d\n", __func__,
|
nr_pages, rc);
|
xen_free_unpopulated_pages(nr_pages, pages);
|
kfree(pages);
|
kfree(pfns);
|
return -ENOMEM;
|
}
|
kfree(pages);
|
|
*gfns = pfns;
|
*virt = vaddr;
|
|
return 0;
|
}
|
|
struct remap_pfn {
|
struct mm_struct *mm;
|
struct page **pages;
|
pgprot_t prot;
|
unsigned long i;
|
};
|
|
static int remap_pfn_fn(pte_t *ptep, unsigned long addr, void *data)
|
{
|
struct remap_pfn *r = data;
|
struct page *page = r->pages[r->i];
|
pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), r->prot));
|
|
set_pte_at(r->mm, addr, ptep, pte);
|
r->i++;
|
|
return 0;
|
}
|
|
/* Used by the privcmd module, but has to be built-in on ARM */
|
int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr, unsigned long len)
|
{
|
struct remap_pfn r = {
|
.mm = vma->vm_mm,
|
.pages = vma->vm_private_data,
|
.prot = vma->vm_page_prot,
|
};
|
|
return apply_to_page_range(vma->vm_mm, addr, len, remap_pfn_fn, &r);
|
}
|
EXPORT_SYMBOL_GPL(xen_remap_vma_range);
|
