2008-04-02 11:54:00 -06:00
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/******************************************************************************
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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/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 <asm/pgtable.h>
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static int map_pte_fn(pte_t *pte, struct page *pmd_page,
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unsigned long addr, void *data)
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{
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unsigned long **frames = (unsigned long **)data;
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set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
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(*frames)++;
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return 0;
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}
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xen/granttable: Grant tables V2 implementation
Receiver-side copying of packets is based on this implementation, it gives
better performance and better CPU accounting. It totally supports three types:
full-page, sub-page and transitive grants.
However this patch does not cover sub-page and transitive grants, it mainly
focus on Full-page part and implements grant table V2 interfaces corresponding
to what already exists in grant table V1, such as: grant table V2
initialization, mapping, releasing and exported interfaces.
Each guest can only supports one type of grant table type, every entry in grant
table should be the same version. It is necessary to set V1 or V2 version before
initializing the grant table.
Grant table exported interfaces of V2 are same with those of V1, Xen is
responsible to judge what grant table version guests are using in every grant
operation.
V2 fulfills the same role of V1, and it is totally backwards compitable with V1.
If dom0 support grant table V2, the guests runing on it can run with either V1
or V2.
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Annie Li <annie.li@oracle.com>
[v1: Modified alloc_vm_area call (new parameters), indentation, and cleanpatch
warnings]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-21 18:59:21 -07:00
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/*
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* This function is used to map shared frames to store grant status. It is
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* different from map_pte_fn above, the frames type here is uint64_t.
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*/
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static int map_pte_fn_status(pte_t *pte, struct page *pmd_page,
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unsigned long addr, void *data)
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{
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uint64_t **frames = (uint64_t **)data;
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set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
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(*frames)++;
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return 0;
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}
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2008-04-02 11:54:00 -06:00
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static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
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unsigned long addr, void *data)
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{
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set_pte_at(&init_mm, addr, pte, __pte(0));
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return 0;
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}
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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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2011-11-21 18:58:06 -07:00
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void **__shared)
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2008-04-02 11:54:00 -06:00
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{
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int rc;
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2011-11-21 18:58:06 -07:00
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void *shared = *__shared;
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2008-04-02 11:54:00 -06:00
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if (shared == NULL) {
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struct vm_struct *area =
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2011-09-29 09:53:32 -06:00
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alloc_vm_area(PAGE_SIZE * max_nr_gframes, NULL);
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2008-04-02 11:54:00 -06:00
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BUG_ON(area == NULL);
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shared = area->addr;
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*__shared = shared;
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}
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rc = apply_to_page_range(&init_mm, (unsigned long)shared,
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PAGE_SIZE * nr_gframes,
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map_pte_fn, &frames);
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return rc;
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}
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xen/granttable: Grant tables V2 implementation
Receiver-side copying of packets is based on this implementation, it gives
better performance and better CPU accounting. It totally supports three types:
full-page, sub-page and transitive grants.
However this patch does not cover sub-page and transitive grants, it mainly
focus on Full-page part and implements grant table V2 interfaces corresponding
to what already exists in grant table V1, such as: grant table V2
initialization, mapping, releasing and exported interfaces.
Each guest can only supports one type of grant table type, every entry in grant
table should be the same version. It is necessary to set V1 or V2 version before
initializing the grant table.
Grant table exported interfaces of V2 are same with those of V1, Xen is
responsible to judge what grant table version guests are using in every grant
operation.
V2 fulfills the same role of V1, and it is totally backwards compitable with V1.
If dom0 support grant table V2, the guests runing on it can run with either V1
or V2.
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Annie Li <annie.li@oracle.com>
[v1: Modified alloc_vm_area call (new parameters), indentation, and cleanpatch
warnings]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-21 18:59:21 -07:00
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int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
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unsigned long max_nr_gframes,
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grant_status_t **__shared)
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{
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int rc;
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grant_status_t *shared = *__shared;
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if (shared == NULL) {
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/* No need to pass in PTE as we are going to do it
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* in apply_to_page_range anyhow. */
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struct vm_struct *area =
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alloc_vm_area(PAGE_SIZE * max_nr_gframes, NULL);
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BUG_ON(area == NULL);
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shared = area->addr;
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*__shared = shared;
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}
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rc = apply_to_page_range(&init_mm, (unsigned long)shared,
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PAGE_SIZE * nr_gframes,
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map_pte_fn_status, &frames);
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return rc;
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}
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void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
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2008-04-02 11:54:00 -06:00
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{
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apply_to_page_range(&init_mm, (unsigned long)shared,
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PAGE_SIZE * nr_gframes, unmap_pte_fn, NULL);
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}
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2014-01-03 08:20:18 -07:00
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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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2014-01-07 07:56:06 -07:00
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#include <xen/xen.h>
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2014-01-03 08:20:18 -07:00
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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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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, 0 /* lowmem */);
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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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rc = arch_gnttab_map_shared(pfns, nr_grant_frames, nr_grant_frames,
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&xen_auto_xlat_grant_frames.vaddr);
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if (rc) {
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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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2014-01-27 08:56:09 -07:00
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kfree(pages);
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2014-01-03 08:20:18 -07:00
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kfree(pfns);
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return rc;
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}
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2014-01-27 08:56:09 -07:00
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kfree(pages);
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2014-01-03 08:20:18 -07:00
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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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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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