7ad863132c
Xen implements grant tables which is for sharing pages with guest domains. This patch implements arch specific part of grant table initialization. and xen_alloc_vm_area()/xen_free_vm_area() which are helper functions for xen grant table. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
155 lines
4 KiB
C
155 lines
4 KiB
C
/******************************************************************************
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* arch/ia64/xen/grant-table.c
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*
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* Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.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/grant_table.h>
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#include <asm/xen/hypervisor.h>
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struct vm_struct *xen_alloc_vm_area(unsigned long size)
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{
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int order;
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unsigned long virt;
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unsigned long nr_pages;
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struct vm_struct *area;
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order = get_order(size);
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virt = __get_free_pages(GFP_KERNEL, order);
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if (virt == 0)
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goto err0;
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nr_pages = 1 << order;
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scrub_pages(virt, nr_pages);
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area = kmalloc(sizeof(*area), GFP_KERNEL);
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if (area == NULL)
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goto err1;
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area->flags = VM_IOREMAP;
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area->addr = (void *)virt;
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area->size = size;
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area->pages = NULL;
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area->nr_pages = nr_pages;
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area->phys_addr = 0; /* xenbus_map_ring_valloc uses this field! */
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return area;
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err1:
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free_pages(virt, order);
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err0:
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return NULL;
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}
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EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
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void xen_free_vm_area(struct vm_struct *area)
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{
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unsigned int order = get_order(area->size);
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unsigned long i;
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unsigned long phys_addr = __pa(area->addr);
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/* This area is used for foreign page mappping.
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* So underlying machine page may not be assigned. */
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for (i = 0; i < (1 << order); i++) {
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unsigned long ret;
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unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
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struct xen_memory_reservation reservation = {
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.nr_extents = 1,
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.address_bits = 0,
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.extent_order = 0,
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.domid = DOMID_SELF
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};
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set_xen_guest_handle(reservation.extent_start, &gpfn);
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ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
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&reservation);
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BUG_ON(ret != 1);
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}
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free_pages((unsigned long)area->addr, order);
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kfree(area);
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}
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EXPORT_SYMBOL_GPL(xen_free_vm_area);
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/****************************************************************************
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* grant table hack
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* cmd: GNTTABOP_xxx
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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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struct grant_entry **__shared)
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{
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*__shared = __va(frames[0] << PAGE_SHIFT);
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return 0;
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}
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void arch_gnttab_unmap_shared(struct grant_entry *shared,
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unsigned long nr_gframes)
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{
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/* nothing */
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}
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static void
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gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
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{
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uint32_t flags;
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flags = uop->flags;
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if (flags & GNTMAP_host_map) {
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if (flags & GNTMAP_application_map) {
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printk(KERN_DEBUG
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"GNTMAP_application_map is not supported yet: "
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"flags 0x%x\n", flags);
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BUG();
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}
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if (flags & GNTMAP_contains_pte) {
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printk(KERN_DEBUG
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"GNTMAP_contains_pte is not supported yet: "
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"flags 0x%x\n", flags);
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BUG();
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}
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} else if (flags & GNTMAP_device_map) {
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printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
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BUG(); /* not yet. actually this flag is not used. */
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} else {
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BUG();
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}
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}
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int
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HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
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{
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if (cmd == GNTTABOP_map_grant_ref) {
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unsigned int i;
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for (i = 0; i < count; i++) {
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gnttab_map_grant_ref_pre(
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(struct gnttab_map_grant_ref *)uop + i);
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}
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}
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return xencomm_hypercall_grant_table_op(cmd, uop, count);
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}
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EXPORT_SYMBOL(HYPERVISOR_grant_table_op);
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