2016-03-08 10:49:57 +00:00
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/*
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* KVM guest address space mapping code
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*
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* Copyright IBM Corp. 2007, 2016
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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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 <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/swapops.h>
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#include <linux/ksm.h>
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#include <linux/mman.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/gmap.h>
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#include <asm/tlb.h>
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/**
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2016-03-08 10:55:04 +00:00
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* gmap_alloc - allocate and initialize a guest address space
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2016-03-08 10:49:57 +00:00
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* @mm: pointer to the parent mm_struct
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2016-04-04 07:41:32 +00:00
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* @limit: maximum address of the gmap address space
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2016-03-08 10:49:57 +00:00
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*
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* Returns a guest address space structure.
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*/
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2016-03-08 10:55:04 +00:00
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static struct gmap *gmap_alloc(unsigned long limit)
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2016-03-08 10:49:57 +00:00
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{
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struct gmap *gmap;
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struct page *page;
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unsigned long *table;
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unsigned long etype, atype;
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if (limit < (1UL << 31)) {
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limit = (1UL << 31) - 1;
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atype = _ASCE_TYPE_SEGMENT;
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etype = _SEGMENT_ENTRY_EMPTY;
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} else if (limit < (1UL << 42)) {
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limit = (1UL << 42) - 1;
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atype = _ASCE_TYPE_REGION3;
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etype = _REGION3_ENTRY_EMPTY;
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} else if (limit < (1UL << 53)) {
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limit = (1UL << 53) - 1;
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atype = _ASCE_TYPE_REGION2;
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etype = _REGION2_ENTRY_EMPTY;
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} else {
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limit = -1UL;
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atype = _ASCE_TYPE_REGION1;
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etype = _REGION1_ENTRY_EMPTY;
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}
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gmap = kzalloc(sizeof(struct gmap), GFP_KERNEL);
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if (!gmap)
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goto out;
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INIT_LIST_HEAD(&gmap->crst_list);
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2016-03-08 11:12:18 +00:00
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INIT_LIST_HEAD(&gmap->children);
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INIT_LIST_HEAD(&gmap->pt_list);
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2016-03-08 10:49:57 +00:00
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INIT_RADIX_TREE(&gmap->guest_to_host, GFP_KERNEL);
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INIT_RADIX_TREE(&gmap->host_to_guest, GFP_ATOMIC);
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2016-03-08 11:12:18 +00:00
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INIT_RADIX_TREE(&gmap->host_to_rmap, GFP_ATOMIC);
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2016-03-08 10:49:57 +00:00
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spin_lock_init(&gmap->guest_table_lock);
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2016-03-08 11:12:18 +00:00
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spin_lock_init(&gmap->shadow_lock);
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2016-03-08 10:55:04 +00:00
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atomic_set(&gmap->ref_count, 1);
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2016-03-08 10:49:57 +00:00
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page = alloc_pages(GFP_KERNEL, 2);
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if (!page)
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goto out_free;
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page->index = 0;
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list_add(&page->lru, &gmap->crst_list);
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table = (unsigned long *) page_to_phys(page);
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crst_table_init(table, etype);
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gmap->table = table;
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gmap->asce = atype | _ASCE_TABLE_LENGTH |
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_ASCE_USER_BITS | __pa(table);
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gmap->asce_end = limit;
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return gmap;
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out_free:
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kfree(gmap);
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out:
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return NULL;
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}
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2016-03-08 10:55:04 +00:00
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/**
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* gmap_create - create a guest address space
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* @mm: pointer to the parent mm_struct
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* @limit: maximum size of the gmap address space
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*
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* Returns a guest address space structure.
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*/
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struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit)
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{
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struct gmap *gmap;
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gmap = gmap_alloc(limit);
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if (!gmap)
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return NULL;
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gmap->mm = mm;
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spin_lock(&mm->context.gmap_lock);
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list_add_rcu(&gmap->list, &mm->context.gmap_list);
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spin_unlock(&mm->context.gmap_lock);
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return gmap;
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}
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EXPORT_SYMBOL_GPL(gmap_create);
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2016-03-08 10:49:57 +00:00
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static void gmap_flush_tlb(struct gmap *gmap)
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{
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if (MACHINE_HAS_IDTE)
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__tlb_flush_asce(gmap->mm, gmap->asce);
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else
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__tlb_flush_global();
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}
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static void gmap_radix_tree_free(struct radix_tree_root *root)
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{
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struct radix_tree_iter iter;
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unsigned long indices[16];
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unsigned long index;
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void **slot;
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int i, nr;
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/* A radix tree is freed by deleting all of its entries */
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index = 0;
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do {
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nr = 0;
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radix_tree_for_each_slot(slot, root, &iter, index) {
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indices[nr] = iter.index;
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if (++nr == 16)
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break;
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}
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for (i = 0; i < nr; i++) {
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index = indices[i];
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radix_tree_delete(root, index);
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}
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} while (nr > 0);
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}
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2016-03-08 11:12:18 +00:00
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static void gmap_rmap_radix_tree_free(struct radix_tree_root *root)
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{
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struct gmap_rmap *rmap, *rnext, *head;
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struct radix_tree_iter iter;
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unsigned long indices[16];
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unsigned long index;
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void **slot;
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int i, nr;
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/* A radix tree is freed by deleting all of its entries */
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index = 0;
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do {
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nr = 0;
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radix_tree_for_each_slot(slot, root, &iter, index) {
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indices[nr] = iter.index;
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if (++nr == 16)
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break;
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}
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for (i = 0; i < nr; i++) {
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index = indices[i];
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head = radix_tree_delete(root, index);
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gmap_for_each_rmap_safe(rmap, rnext, head)
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kfree(rmap);
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}
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} while (nr > 0);
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}
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2016-03-08 10:49:57 +00:00
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/**
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* gmap_free - free a guest address space
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* @gmap: pointer to the guest address space structure
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2016-03-08 11:12:18 +00:00
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*
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* No locks required. There are no references to this gmap anymore.
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2016-03-08 10:49:57 +00:00
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*/
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2016-03-08 10:55:04 +00:00
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static void gmap_free(struct gmap *gmap)
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2016-03-08 10:49:57 +00:00
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{
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struct page *page, *next;
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2016-04-15 10:45:45 +00:00
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/* Flush tlb of all gmaps (if not already done for shadows) */
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if (!(gmap_is_shadow(gmap) && gmap->removed))
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gmap_flush_tlb(gmap);
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2016-03-08 10:49:57 +00:00
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/* Free all segment & region tables. */
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list_for_each_entry_safe(page, next, &gmap->crst_list, lru)
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__free_pages(page, 2);
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gmap_radix_tree_free(&gmap->guest_to_host);
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gmap_radix_tree_free(&gmap->host_to_guest);
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2016-03-08 11:12:18 +00:00
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/* Free additional data for a shadow gmap */
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if (gmap_is_shadow(gmap)) {
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/* Free all page tables. */
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list_for_each_entry_safe(page, next, &gmap->pt_list, lru)
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page_table_free_pgste(page);
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gmap_rmap_radix_tree_free(&gmap->host_to_rmap);
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/* Release reference to the parent */
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gmap_put(gmap->parent);
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}
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2016-03-08 10:49:57 +00:00
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kfree(gmap);
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}
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2016-03-08 10:55:04 +00:00
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/**
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* gmap_get - increase reference counter for guest address space
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* @gmap: pointer to the guest address space structure
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*
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* Returns the gmap pointer
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*/
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struct gmap *gmap_get(struct gmap *gmap)
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{
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atomic_inc(&gmap->ref_count);
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return gmap;
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}
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EXPORT_SYMBOL_GPL(gmap_get);
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/**
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* gmap_put - decrease reference counter for guest address space
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* @gmap: pointer to the guest address space structure
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*
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* If the reference counter reaches zero the guest address space is freed.
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*/
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void gmap_put(struct gmap *gmap)
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{
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if (atomic_dec_return(&gmap->ref_count) == 0)
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gmap_free(gmap);
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}
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EXPORT_SYMBOL_GPL(gmap_put);
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/**
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* gmap_remove - remove a guest address space but do not free it yet
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* @gmap: pointer to the guest address space structure
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*/
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void gmap_remove(struct gmap *gmap)
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{
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2016-03-08 11:12:18 +00:00
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struct gmap *sg, *next;
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/* Remove all shadow gmaps linked to this gmap */
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if (!list_empty(&gmap->children)) {
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spin_lock(&gmap->shadow_lock);
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list_for_each_entry_safe(sg, next, &gmap->children, list) {
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list_del(&sg->list);
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gmap_put(sg);
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}
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spin_unlock(&gmap->shadow_lock);
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}
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2016-03-08 10:55:04 +00:00
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/* Remove gmap from the pre-mm list */
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spin_lock(&gmap->mm->context.gmap_lock);
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list_del_rcu(&gmap->list);
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spin_unlock(&gmap->mm->context.gmap_lock);
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synchronize_rcu();
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/* Put reference */
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gmap_put(gmap);
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}
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EXPORT_SYMBOL_GPL(gmap_remove);
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2016-03-08 10:49:57 +00:00
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/**
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* gmap_enable - switch primary space to the guest address space
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* @gmap: pointer to the guest address space structure
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*/
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void gmap_enable(struct gmap *gmap)
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{
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S390_lowcore.gmap = (unsigned long) gmap;
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}
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EXPORT_SYMBOL_GPL(gmap_enable);
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/**
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* gmap_disable - switch back to the standard primary address space
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* @gmap: pointer to the guest address space structure
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*/
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void gmap_disable(struct gmap *gmap)
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{
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S390_lowcore.gmap = 0UL;
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}
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EXPORT_SYMBOL_GPL(gmap_disable);
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/*
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* gmap_alloc_table is assumed to be called with mmap_sem held
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*/
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static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
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unsigned long init, unsigned long gaddr)
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{
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struct page *page;
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unsigned long *new;
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/* since we dont free the gmap table until gmap_free we can unlock */
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page = alloc_pages(GFP_KERNEL, 2);
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if (!page)
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return -ENOMEM;
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new = (unsigned long *) page_to_phys(page);
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crst_table_init(new, init);
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2016-03-08 11:12:18 +00:00
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spin_lock(&gmap->guest_table_lock);
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2016-03-08 10:49:57 +00:00
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if (*table & _REGION_ENTRY_INVALID) {
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list_add(&page->lru, &gmap->crst_list);
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*table = (unsigned long) new | _REGION_ENTRY_LENGTH |
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(*table & _REGION_ENTRY_TYPE_MASK);
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page->index = gaddr;
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page = NULL;
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}
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2016-03-08 11:12:18 +00:00
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spin_unlock(&gmap->guest_table_lock);
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2016-03-08 10:49:57 +00:00
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if (page)
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__free_pages(page, 2);
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return 0;
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}
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/**
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* __gmap_segment_gaddr - find virtual address from segment pointer
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* @entry: pointer to a segment table entry in the guest address space
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*
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* Returns the virtual address in the guest address space for the segment
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*/
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static unsigned long __gmap_segment_gaddr(unsigned long *entry)
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{
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struct page *page;
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unsigned long offset, mask;
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offset = (unsigned long) entry / sizeof(unsigned long);
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offset = (offset & (PTRS_PER_PMD - 1)) * PMD_SIZE;
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mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
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page = virt_to_page((void *)((unsigned long) entry & mask));
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return page->index + offset;
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}
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/**
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* __gmap_unlink_by_vmaddr - unlink a single segment via a host address
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* @gmap: pointer to the guest address space structure
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* @vmaddr: address in the host process address space
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*
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* Returns 1 if a TLB flush is required
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*/
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static int __gmap_unlink_by_vmaddr(struct gmap *gmap, unsigned long vmaddr)
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{
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unsigned long *entry;
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int flush = 0;
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|
2016-03-08 11:12:18 +00:00
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BUG_ON(gmap_is_shadow(gmap));
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2016-03-08 10:49:57 +00:00
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spin_lock(&gmap->guest_table_lock);
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entry = radix_tree_delete(&gmap->host_to_guest, vmaddr >> PMD_SHIFT);
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if (entry) {
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flush = (*entry != _SEGMENT_ENTRY_INVALID);
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*entry = _SEGMENT_ENTRY_INVALID;
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}
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spin_unlock(&gmap->guest_table_lock);
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return flush;
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}
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/**
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* __gmap_unmap_by_gaddr - unmap a single segment via a guest address
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* @gmap: pointer to the guest address space structure
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* @gaddr: address in the guest address space
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*
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* Returns 1 if a TLB flush is required
|
|
|
|
*/
|
|
|
|
static int __gmap_unmap_by_gaddr(struct gmap *gmap, unsigned long gaddr)
|
|
|
|
{
|
|
|
|
unsigned long vmaddr;
|
|
|
|
|
|
|
|
vmaddr = (unsigned long) radix_tree_delete(&gmap->guest_to_host,
|
|
|
|
gaddr >> PMD_SHIFT);
|
|
|
|
return vmaddr ? __gmap_unlink_by_vmaddr(gmap, vmaddr) : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unmap_segment - unmap segment from the guest address space
|
|
|
|
* @gmap: pointer to the guest address space structure
|
|
|
|
* @to: address in the guest address space
|
|
|
|
* @len: length of the memory area to unmap
|
|
|
|
*
|
|
|
|
* Returns 0 if the unmap succeeded, -EINVAL if not.
|
|
|
|
*/
|
|
|
|
int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len)
|
|
|
|
{
|
|
|
|
unsigned long off;
|
|
|
|
int flush;
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
BUG_ON(gmap_is_shadow(gmap));
|
2016-03-08 10:49:57 +00:00
|
|
|
if ((to | len) & (PMD_SIZE - 1))
|
|
|
|
return -EINVAL;
|
|
|
|
if (len == 0 || to + len < to)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
flush = 0;
|
|
|
|
down_write(&gmap->mm->mmap_sem);
|
|
|
|
for (off = 0; off < len; off += PMD_SIZE)
|
|
|
|
flush |= __gmap_unmap_by_gaddr(gmap, to + off);
|
|
|
|
up_write(&gmap->mm->mmap_sem);
|
|
|
|
if (flush)
|
|
|
|
gmap_flush_tlb(gmap);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_unmap_segment);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_map_segment - map a segment to the guest address space
|
|
|
|
* @gmap: pointer to the guest address space structure
|
|
|
|
* @from: source address in the parent address space
|
|
|
|
* @to: target address in the guest address space
|
|
|
|
* @len: length of the memory area to map
|
|
|
|
*
|
|
|
|
* Returns 0 if the mmap succeeded, -EINVAL or -ENOMEM if not.
|
|
|
|
*/
|
|
|
|
int gmap_map_segment(struct gmap *gmap, unsigned long from,
|
|
|
|
unsigned long to, unsigned long len)
|
|
|
|
{
|
|
|
|
unsigned long off;
|
|
|
|
int flush;
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
BUG_ON(gmap_is_shadow(gmap));
|
2016-03-08 10:49:57 +00:00
|
|
|
if ((from | to | len) & (PMD_SIZE - 1))
|
|
|
|
return -EINVAL;
|
|
|
|
if (len == 0 || from + len < from || to + len < to ||
|
2016-04-04 07:41:32 +00:00
|
|
|
from + len - 1 > TASK_MAX_SIZE || to + len - 1 > gmap->asce_end)
|
2016-03-08 10:49:57 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
flush = 0;
|
|
|
|
down_write(&gmap->mm->mmap_sem);
|
|
|
|
for (off = 0; off < len; off += PMD_SIZE) {
|
|
|
|
/* Remove old translation */
|
|
|
|
flush |= __gmap_unmap_by_gaddr(gmap, to + off);
|
|
|
|
/* Store new translation */
|
|
|
|
if (radix_tree_insert(&gmap->guest_to_host,
|
|
|
|
(to + off) >> PMD_SHIFT,
|
|
|
|
(void *) from + off))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
up_write(&gmap->mm->mmap_sem);
|
|
|
|
if (flush)
|
|
|
|
gmap_flush_tlb(gmap);
|
|
|
|
if (off >= len)
|
|
|
|
return 0;
|
|
|
|
gmap_unmap_segment(gmap, to, len);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_map_segment);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __gmap_translate - translate a guest address to a user space address
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: guest address
|
|
|
|
*
|
|
|
|
* Returns user space address which corresponds to the guest address or
|
|
|
|
* -EFAULT if no such mapping exists.
|
|
|
|
* This function does not establish potentially missing page table entries.
|
|
|
|
* The mmap_sem of the mm that belongs to the address space must be held
|
|
|
|
* when this function gets called.
|
2016-03-08 11:12:18 +00:00
|
|
|
*
|
|
|
|
* Note: Can also be called for shadow gmaps.
|
2016-03-08 10:49:57 +00:00
|
|
|
*/
|
|
|
|
unsigned long __gmap_translate(struct gmap *gmap, unsigned long gaddr)
|
|
|
|
{
|
|
|
|
unsigned long vmaddr;
|
|
|
|
|
|
|
|
vmaddr = (unsigned long)
|
|
|
|
radix_tree_lookup(&gmap->guest_to_host, gaddr >> PMD_SHIFT);
|
2016-03-08 11:12:18 +00:00
|
|
|
/* Note: guest_to_host is empty for a shadow gmap */
|
2016-03-08 10:49:57 +00:00
|
|
|
return vmaddr ? (vmaddr | (gaddr & ~PMD_MASK)) : -EFAULT;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__gmap_translate);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_translate - translate a guest address to a user space address
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: guest address
|
|
|
|
*
|
|
|
|
* Returns user space address which corresponds to the guest address or
|
|
|
|
* -EFAULT if no such mapping exists.
|
|
|
|
* This function does not establish potentially missing page table entries.
|
|
|
|
*/
|
|
|
|
unsigned long gmap_translate(struct gmap *gmap, unsigned long gaddr)
|
|
|
|
{
|
|
|
|
unsigned long rc;
|
|
|
|
|
|
|
|
down_read(&gmap->mm->mmap_sem);
|
|
|
|
rc = __gmap_translate(gmap, gaddr);
|
|
|
|
up_read(&gmap->mm->mmap_sem);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_translate);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unlink - disconnect a page table from the gmap shadow tables
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @table: pointer to the host page table
|
|
|
|
* @vmaddr: vm address associated with the host page table
|
|
|
|
*/
|
|
|
|
void gmap_unlink(struct mm_struct *mm, unsigned long *table,
|
|
|
|
unsigned long vmaddr)
|
|
|
|
{
|
|
|
|
struct gmap *gmap;
|
|
|
|
int flush;
|
|
|
|
|
2016-03-08 10:54:14 +00:00
|
|
|
rcu_read_lock();
|
|
|
|
list_for_each_entry_rcu(gmap, &mm->context.gmap_list, list) {
|
2016-03-08 10:49:57 +00:00
|
|
|
flush = __gmap_unlink_by_vmaddr(gmap, vmaddr);
|
|
|
|
if (flush)
|
|
|
|
gmap_flush_tlb(gmap);
|
|
|
|
}
|
2016-03-08 10:54:14 +00:00
|
|
|
rcu_read_unlock();
|
2016-03-08 10:49:57 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_link - set up shadow page tables to connect a host to a guest address
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: guest address
|
|
|
|
* @vmaddr: vm address
|
|
|
|
*
|
|
|
|
* Returns 0 on success, -ENOMEM for out of memory conditions, and -EFAULT
|
|
|
|
* if the vm address is already mapped to a different guest segment.
|
|
|
|
* The mmap_sem of the mm that belongs to the address space must be held
|
|
|
|
* when this function gets called.
|
|
|
|
*/
|
|
|
|
int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr)
|
|
|
|
{
|
|
|
|
struct mm_struct *mm;
|
|
|
|
unsigned long *table;
|
|
|
|
spinlock_t *ptl;
|
|
|
|
pgd_t *pgd;
|
|
|
|
pud_t *pud;
|
|
|
|
pmd_t *pmd;
|
|
|
|
int rc;
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
BUG_ON(gmap_is_shadow(gmap));
|
2016-03-08 10:49:57 +00:00
|
|
|
/* Create higher level tables in the gmap page table */
|
|
|
|
table = gmap->table;
|
|
|
|
if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION1) {
|
|
|
|
table += (gaddr >> 53) & 0x7ff;
|
|
|
|
if ((*table & _REGION_ENTRY_INVALID) &&
|
|
|
|
gmap_alloc_table(gmap, table, _REGION2_ENTRY_EMPTY,
|
|
|
|
gaddr & 0xffe0000000000000UL))
|
|
|
|
return -ENOMEM;
|
|
|
|
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
|
|
|
|
}
|
|
|
|
if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION2) {
|
|
|
|
table += (gaddr >> 42) & 0x7ff;
|
|
|
|
if ((*table & _REGION_ENTRY_INVALID) &&
|
|
|
|
gmap_alloc_table(gmap, table, _REGION3_ENTRY_EMPTY,
|
|
|
|
gaddr & 0xfffffc0000000000UL))
|
|
|
|
return -ENOMEM;
|
|
|
|
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
|
|
|
|
}
|
|
|
|
if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION3) {
|
|
|
|
table += (gaddr >> 31) & 0x7ff;
|
|
|
|
if ((*table & _REGION_ENTRY_INVALID) &&
|
|
|
|
gmap_alloc_table(gmap, table, _SEGMENT_ENTRY_EMPTY,
|
|
|
|
gaddr & 0xffffffff80000000UL))
|
|
|
|
return -ENOMEM;
|
|
|
|
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
|
|
|
|
}
|
|
|
|
table += (gaddr >> 20) & 0x7ff;
|
|
|
|
/* Walk the parent mm page table */
|
|
|
|
mm = gmap->mm;
|
|
|
|
pgd = pgd_offset(mm, vmaddr);
|
|
|
|
VM_BUG_ON(pgd_none(*pgd));
|
|
|
|
pud = pud_offset(pgd, vmaddr);
|
|
|
|
VM_BUG_ON(pud_none(*pud));
|
|
|
|
pmd = pmd_offset(pud, vmaddr);
|
|
|
|
VM_BUG_ON(pmd_none(*pmd));
|
|
|
|
/* large pmds cannot yet be handled */
|
|
|
|
if (pmd_large(*pmd))
|
|
|
|
return -EFAULT;
|
|
|
|
/* Link gmap segment table entry location to page table. */
|
|
|
|
rc = radix_tree_preload(GFP_KERNEL);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
ptl = pmd_lock(mm, pmd);
|
|
|
|
spin_lock(&gmap->guest_table_lock);
|
|
|
|
if (*table == _SEGMENT_ENTRY_INVALID) {
|
|
|
|
rc = radix_tree_insert(&gmap->host_to_guest,
|
|
|
|
vmaddr >> PMD_SHIFT, table);
|
|
|
|
if (!rc)
|
|
|
|
*table = pmd_val(*pmd);
|
|
|
|
} else
|
|
|
|
rc = 0;
|
|
|
|
spin_unlock(&gmap->guest_table_lock);
|
|
|
|
spin_unlock(ptl);
|
|
|
|
radix_tree_preload_end();
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_fault - resolve a fault on a guest address
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: guest address
|
|
|
|
* @fault_flags: flags to pass down to handle_mm_fault()
|
|
|
|
*
|
|
|
|
* Returns 0 on success, -ENOMEM for out of memory conditions, and -EFAULT
|
|
|
|
* if the vm address is already mapped to a different guest segment.
|
|
|
|
*/
|
|
|
|
int gmap_fault(struct gmap *gmap, unsigned long gaddr,
|
|
|
|
unsigned int fault_flags)
|
|
|
|
{
|
|
|
|
unsigned long vmaddr;
|
|
|
|
int rc;
|
|
|
|
bool unlocked;
|
|
|
|
|
|
|
|
down_read(&gmap->mm->mmap_sem);
|
|
|
|
|
|
|
|
retry:
|
|
|
|
unlocked = false;
|
|
|
|
vmaddr = __gmap_translate(gmap, gaddr);
|
|
|
|
if (IS_ERR_VALUE(vmaddr)) {
|
|
|
|
rc = vmaddr;
|
|
|
|
goto out_up;
|
|
|
|
}
|
|
|
|
if (fixup_user_fault(current, gmap->mm, vmaddr, fault_flags,
|
|
|
|
&unlocked)) {
|
|
|
|
rc = -EFAULT;
|
|
|
|
goto out_up;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* In the case that fixup_user_fault unlocked the mmap_sem during
|
|
|
|
* faultin redo __gmap_translate to not race with a map/unmap_segment.
|
|
|
|
*/
|
|
|
|
if (unlocked)
|
|
|
|
goto retry;
|
|
|
|
|
|
|
|
rc = __gmap_link(gmap, gaddr, vmaddr);
|
|
|
|
out_up:
|
|
|
|
up_read(&gmap->mm->mmap_sem);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_fault);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this function is assumed to be called with mmap_sem held
|
|
|
|
*/
|
|
|
|
void __gmap_zap(struct gmap *gmap, unsigned long gaddr)
|
|
|
|
{
|
|
|
|
unsigned long vmaddr;
|
|
|
|
spinlock_t *ptl;
|
|
|
|
pte_t *ptep;
|
|
|
|
|
|
|
|
/* Find the vm address for the guest address */
|
|
|
|
vmaddr = (unsigned long) radix_tree_lookup(&gmap->guest_to_host,
|
|
|
|
gaddr >> PMD_SHIFT);
|
|
|
|
if (vmaddr) {
|
|
|
|
vmaddr |= gaddr & ~PMD_MASK;
|
|
|
|
/* Get pointer to the page table entry */
|
|
|
|
ptep = get_locked_pte(gmap->mm, vmaddr, &ptl);
|
|
|
|
if (likely(ptep))
|
|
|
|
ptep_zap_unused(gmap->mm, vmaddr, ptep, 0);
|
|
|
|
pte_unmap_unlock(ptep, ptl);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__gmap_zap);
|
|
|
|
|
|
|
|
void gmap_discard(struct gmap *gmap, unsigned long from, unsigned long to)
|
|
|
|
{
|
|
|
|
unsigned long gaddr, vmaddr, size;
|
|
|
|
struct vm_area_struct *vma;
|
|
|
|
|
|
|
|
down_read(&gmap->mm->mmap_sem);
|
|
|
|
for (gaddr = from; gaddr < to;
|
|
|
|
gaddr = (gaddr + PMD_SIZE) & PMD_MASK) {
|
|
|
|
/* Find the vm address for the guest address */
|
|
|
|
vmaddr = (unsigned long)
|
|
|
|
radix_tree_lookup(&gmap->guest_to_host,
|
|
|
|
gaddr >> PMD_SHIFT);
|
|
|
|
if (!vmaddr)
|
|
|
|
continue;
|
|
|
|
vmaddr |= gaddr & ~PMD_MASK;
|
|
|
|
/* Find vma in the parent mm */
|
|
|
|
vma = find_vma(gmap->mm, vmaddr);
|
|
|
|
size = min(to - gaddr, PMD_SIZE - (gaddr & ~PMD_MASK));
|
|
|
|
zap_page_range(vma, vmaddr, size, NULL);
|
|
|
|
}
|
|
|
|
up_read(&gmap->mm->mmap_sem);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_discard);
|
|
|
|
|
|
|
|
static LIST_HEAD(gmap_notifier_list);
|
|
|
|
static DEFINE_SPINLOCK(gmap_notifier_lock);
|
|
|
|
|
|
|
|
/**
|
2016-03-08 10:54:42 +00:00
|
|
|
* gmap_register_pte_notifier - register a pte invalidation callback
|
2016-03-08 10:49:57 +00:00
|
|
|
* @nb: pointer to the gmap notifier block
|
|
|
|
*/
|
2016-03-08 10:54:42 +00:00
|
|
|
void gmap_register_pte_notifier(struct gmap_notifier *nb)
|
2016-03-08 10:49:57 +00:00
|
|
|
{
|
|
|
|
spin_lock(&gmap_notifier_lock);
|
2016-03-08 10:54:14 +00:00
|
|
|
list_add_rcu(&nb->list, &gmap_notifier_list);
|
2016-03-08 10:49:57 +00:00
|
|
|
spin_unlock(&gmap_notifier_lock);
|
|
|
|
}
|
2016-03-08 10:54:42 +00:00
|
|
|
EXPORT_SYMBOL_GPL(gmap_register_pte_notifier);
|
2016-03-08 10:49:57 +00:00
|
|
|
|
|
|
|
/**
|
2016-03-08 10:54:42 +00:00
|
|
|
* gmap_unregister_pte_notifier - remove a pte invalidation callback
|
2016-03-08 10:49:57 +00:00
|
|
|
* @nb: pointer to the gmap notifier block
|
|
|
|
*/
|
2016-03-08 10:54:42 +00:00
|
|
|
void gmap_unregister_pte_notifier(struct gmap_notifier *nb)
|
2016-03-08 10:49:57 +00:00
|
|
|
{
|
|
|
|
spin_lock(&gmap_notifier_lock);
|
2016-03-08 10:54:14 +00:00
|
|
|
list_del_rcu(&nb->list);
|
2016-03-08 10:49:57 +00:00
|
|
|
spin_unlock(&gmap_notifier_lock);
|
2016-03-08 10:54:14 +00:00
|
|
|
synchronize_rcu();
|
2016-03-08 10:49:57 +00:00
|
|
|
}
|
2016-03-08 10:54:42 +00:00
|
|
|
EXPORT_SYMBOL_GPL(gmap_unregister_pte_notifier);
|
2016-03-08 10:49:57 +00:00
|
|
|
|
2016-03-08 10:52:54 +00:00
|
|
|
/**
|
|
|
|
* gmap_call_notifier - call all registered invalidation callbacks
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @start: start virtual address in the guest address space
|
|
|
|
* @end: end virtual address in the guest address space
|
|
|
|
*/
|
|
|
|
static void gmap_call_notifier(struct gmap *gmap, unsigned long start,
|
|
|
|
unsigned long end)
|
|
|
|
{
|
|
|
|
struct gmap_notifier *nb;
|
|
|
|
|
|
|
|
list_for_each_entry(nb, &gmap_notifier_list, list)
|
|
|
|
nb->notifier_call(gmap, start, end);
|
|
|
|
}
|
|
|
|
|
2016-03-08 10:49:57 +00:00
|
|
|
/**
|
2016-03-08 10:54:42 +00:00
|
|
|
* gmap_table_walk - walk the gmap page tables
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: virtual address in the guest address space
|
2016-03-08 11:12:18 +00:00
|
|
|
* @level: page table level to stop at
|
|
|
|
*
|
|
|
|
* Returns a table entry pointer for the given guest address and @level
|
|
|
|
* @level=0 : returns a pointer to a page table table entry (or NULL)
|
|
|
|
* @level=1 : returns a pointer to a segment table entry (or NULL)
|
|
|
|
* @level=2 : returns a pointer to a region-3 table entry (or NULL)
|
|
|
|
* @level=3 : returns a pointer to a region-2 table entry (or NULL)
|
|
|
|
* @level=4 : returns a pointer to a region-1 table entry (or NULL)
|
|
|
|
*
|
|
|
|
* Returns NULL if the gmap page tables could not be walked to the
|
|
|
|
* requested level.
|
2016-03-08 10:54:42 +00:00
|
|
|
*
|
2016-03-08 11:12:18 +00:00
|
|
|
* Note: Can also be called for shadow gmaps.
|
2016-03-08 10:54:42 +00:00
|
|
|
*/
|
|
|
|
static inline unsigned long *gmap_table_walk(struct gmap *gmap,
|
2016-03-08 11:12:18 +00:00
|
|
|
unsigned long gaddr, int level)
|
2016-03-08 10:54:42 +00:00
|
|
|
{
|
|
|
|
unsigned long *table;
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
if ((gmap->asce & _ASCE_TYPE_MASK) + 4 < (level * 4))
|
|
|
|
return NULL;
|
|
|
|
if (gmap_is_shadow(gmap) && gmap->removed)
|
|
|
|
return NULL;
|
|
|
|
if (gaddr & (-1UL << (31 + ((gmap->asce & _ASCE_TYPE_MASK) >> 2)*11)))
|
|
|
|
return NULL;
|
2016-03-08 10:54:42 +00:00
|
|
|
table = gmap->table;
|
|
|
|
switch (gmap->asce & _ASCE_TYPE_MASK) {
|
|
|
|
case _ASCE_TYPE_REGION1:
|
|
|
|
table += (gaddr >> 53) & 0x7ff;
|
2016-03-08 11:12:18 +00:00
|
|
|
if (level == 4)
|
|
|
|
break;
|
2016-03-08 10:54:42 +00:00
|
|
|
if (*table & _REGION_ENTRY_INVALID)
|
|
|
|
return NULL;
|
|
|
|
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
|
|
|
|
/* Fallthrough */
|
|
|
|
case _ASCE_TYPE_REGION2:
|
|
|
|
table += (gaddr >> 42) & 0x7ff;
|
2016-03-08 11:12:18 +00:00
|
|
|
if (level == 3)
|
|
|
|
break;
|
2016-03-08 10:54:42 +00:00
|
|
|
if (*table & _REGION_ENTRY_INVALID)
|
|
|
|
return NULL;
|
|
|
|
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
|
|
|
|
/* Fallthrough */
|
|
|
|
case _ASCE_TYPE_REGION3:
|
|
|
|
table += (gaddr >> 31) & 0x7ff;
|
2016-03-08 11:12:18 +00:00
|
|
|
if (level == 2)
|
|
|
|
break;
|
2016-03-08 10:54:42 +00:00
|
|
|
if (*table & _REGION_ENTRY_INVALID)
|
|
|
|
return NULL;
|
|
|
|
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
|
|
|
|
/* Fallthrough */
|
|
|
|
case _ASCE_TYPE_SEGMENT:
|
|
|
|
table += (gaddr >> 20) & 0x7ff;
|
2016-03-08 11:12:18 +00:00
|
|
|
if (level == 1)
|
|
|
|
break;
|
|
|
|
if (*table & _REGION_ENTRY_INVALID)
|
|
|
|
return NULL;
|
|
|
|
table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
|
|
|
|
table += (gaddr >> 12) & 0xff;
|
2016-03-08 10:54:42 +00:00
|
|
|
}
|
|
|
|
return table;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_pte_op_walk - walk the gmap page table, get the page table lock
|
|
|
|
* and return the pte pointer
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: virtual address in the guest address space
|
|
|
|
* @ptl: pointer to the spinlock pointer
|
|
|
|
*
|
|
|
|
* Returns a pointer to the locked pte for a guest address, or NULL
|
2016-03-08 11:12:18 +00:00
|
|
|
*
|
|
|
|
* Note: Can also be called for shadow gmaps.
|
2016-03-08 10:54:42 +00:00
|
|
|
*/
|
|
|
|
static pte_t *gmap_pte_op_walk(struct gmap *gmap, unsigned long gaddr,
|
|
|
|
spinlock_t **ptl)
|
|
|
|
{
|
|
|
|
unsigned long *table;
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
if (gmap_is_shadow(gmap))
|
|
|
|
spin_lock(&gmap->guest_table_lock);
|
2016-03-08 10:54:42 +00:00
|
|
|
/* Walk the gmap page table, lock and get pte pointer */
|
2016-03-08 11:12:18 +00:00
|
|
|
table = gmap_table_walk(gmap, gaddr, 1); /* get segment pointer */
|
|
|
|
if (!table || *table & _SEGMENT_ENTRY_INVALID) {
|
|
|
|
if (gmap_is_shadow(gmap))
|
|
|
|
spin_unlock(&gmap->guest_table_lock);
|
2016-03-08 10:54:42 +00:00
|
|
|
return NULL;
|
2016-03-08 11:12:18 +00:00
|
|
|
}
|
|
|
|
if (gmap_is_shadow(gmap)) {
|
|
|
|
*ptl = &gmap->guest_table_lock;
|
|
|
|
return pte_offset_map((pmd_t *) table, gaddr);
|
|
|
|
}
|
2016-03-08 10:54:42 +00:00
|
|
|
return pte_alloc_map_lock(gmap->mm, (pmd_t *) table, gaddr, ptl);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_pte_op_fixup - force a page in and connect the gmap page table
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: virtual address in the guest address space
|
|
|
|
* @vmaddr: address in the host process address space
|
|
|
|
*
|
|
|
|
* Returns 0 if the caller can retry __gmap_translate (might fail again),
|
|
|
|
* -ENOMEM if out of memory and -EFAULT if anything goes wrong while fixing
|
|
|
|
* up or connecting the gmap page table.
|
|
|
|
*/
|
|
|
|
static int gmap_pte_op_fixup(struct gmap *gmap, unsigned long gaddr,
|
|
|
|
unsigned long vmaddr)
|
|
|
|
{
|
|
|
|
struct mm_struct *mm = gmap->mm;
|
|
|
|
bool unlocked = false;
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
BUG_ON(gmap_is_shadow(gmap));
|
2016-03-08 10:54:42 +00:00
|
|
|
if (fixup_user_fault(current, mm, vmaddr, FAULT_FLAG_WRITE, &unlocked))
|
|
|
|
return -EFAULT;
|
|
|
|
if (unlocked)
|
|
|
|
/* lost mmap_sem, caller has to retry __gmap_translate */
|
|
|
|
return 0;
|
|
|
|
/* Connect the page tables */
|
|
|
|
return __gmap_link(gmap, gaddr, vmaddr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_pte_op_end - release the page table lock
|
|
|
|
* @ptl: pointer to the spinlock pointer
|
|
|
|
*/
|
|
|
|
static void gmap_pte_op_end(spinlock_t *ptl)
|
|
|
|
{
|
|
|
|
spin_unlock(ptl);
|
|
|
|
}
|
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
/*
|
|
|
|
* gmap_protect_range - remove access rights to memory and set pgste bits
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: virtual address in the guest address space
|
|
|
|
* @len: size of area
|
|
|
|
* @prot: indicates access rights: PROT_NONE, PROT_READ or PROT_WRITE
|
|
|
|
* @bits: pgste notification bits to set
|
|
|
|
*
|
|
|
|
* Returns 0 if successfully protected, -ENOMEM if out of memory and
|
|
|
|
* -EFAULT if gaddr is invalid (or mapping for shadows is missing).
|
|
|
|
*
|
|
|
|
* Called with sg->mm->mmap_sem in read.
|
|
|
|
*
|
|
|
|
* Note: Can also be called for shadow gmaps.
|
|
|
|
*/
|
|
|
|
static int gmap_protect_range(struct gmap *gmap, unsigned long gaddr,
|
|
|
|
unsigned long len, int prot, unsigned long bits)
|
|
|
|
{
|
|
|
|
unsigned long vmaddr;
|
|
|
|
spinlock_t *ptl;
|
|
|
|
pte_t *ptep;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
while (len) {
|
|
|
|
rc = -EAGAIN;
|
|
|
|
ptep = gmap_pte_op_walk(gmap, gaddr, &ptl);
|
|
|
|
if (ptep) {
|
|
|
|
rc = ptep_force_prot(gmap->mm, gaddr, ptep, prot, bits);
|
|
|
|
gmap_pte_op_end(ptl);
|
|
|
|
}
|
|
|
|
if (rc) {
|
|
|
|
vmaddr = __gmap_translate(gmap, gaddr);
|
|
|
|
if (IS_ERR_VALUE(vmaddr))
|
|
|
|
return vmaddr;
|
|
|
|
rc = gmap_pte_op_fixup(gmap, gaddr, vmaddr);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
gaddr += PAGE_SIZE;
|
|
|
|
len -= PAGE_SIZE;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-03-08 10:54:42 +00:00
|
|
|
/**
|
|
|
|
* gmap_mprotect_notify - change access rights for a range of ptes and
|
|
|
|
* call the notifier if any pte changes again
|
2016-03-08 10:49:57 +00:00
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: virtual address in the guest address space
|
|
|
|
* @len: size of area
|
2016-03-08 10:54:42 +00:00
|
|
|
* @prot: indicates access rights: PROT_NONE, PROT_READ or PROT_WRITE
|
2016-03-08 10:49:57 +00:00
|
|
|
*
|
2016-03-08 10:54:42 +00:00
|
|
|
* Returns 0 if for each page in the given range a gmap mapping exists,
|
|
|
|
* the new access rights could be set and the notifier could be armed.
|
|
|
|
* If the gmap mapping is missing for one or more pages -EFAULT is
|
|
|
|
* returned. If no memory could be allocated -ENOMEM is returned.
|
|
|
|
* This function establishes missing page table entries.
|
2016-03-08 10:49:57 +00:00
|
|
|
*/
|
2016-03-08 10:54:42 +00:00
|
|
|
int gmap_mprotect_notify(struct gmap *gmap, unsigned long gaddr,
|
|
|
|
unsigned long len, int prot)
|
2016-03-08 10:49:57 +00:00
|
|
|
{
|
2016-03-08 11:12:18 +00:00
|
|
|
int rc;
|
2016-03-08 10:49:57 +00:00
|
|
|
|
2016-03-08 11:12:18 +00:00
|
|
|
if ((gaddr & ~PAGE_MASK) || (len & ~PAGE_MASK) || gmap_is_shadow(gmap))
|
2016-03-08 10:49:57 +00:00
|
|
|
return -EINVAL;
|
2016-03-08 10:54:42 +00:00
|
|
|
if (!MACHINE_HAS_ESOP && prot == PROT_READ)
|
|
|
|
return -EINVAL;
|
2016-03-08 10:49:57 +00:00
|
|
|
down_read(&gmap->mm->mmap_sem);
|
2016-03-08 11:12:18 +00:00
|
|
|
rc = gmap_protect_range(gmap, gaddr, len, prot, PGSTE_IN_BIT);
|
|
|
|
up_read(&gmap->mm->mmap_sem);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_mprotect_notify);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_read_table - get an unsigned long value from a guest page table using
|
|
|
|
* absolute addressing, without marking the page referenced.
|
|
|
|
* @gmap: pointer to guest mapping meta data structure
|
|
|
|
* @gaddr: virtual address in the guest address space
|
|
|
|
* @val: pointer to the unsigned long value to return
|
|
|
|
*
|
|
|
|
* Returns 0 if the value was read, -ENOMEM if out of memory and -EFAULT
|
|
|
|
* if reading using the virtual address failed.
|
|
|
|
*
|
|
|
|
* Called with gmap->mm->mmap_sem in read.
|
|
|
|
*/
|
|
|
|
int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val)
|
|
|
|
{
|
|
|
|
unsigned long address, vmaddr;
|
|
|
|
spinlock_t *ptl;
|
|
|
|
pte_t *ptep, pte;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
while (1) {
|
2016-03-08 10:54:42 +00:00
|
|
|
rc = -EAGAIN;
|
|
|
|
ptep = gmap_pte_op_walk(gmap, gaddr, &ptl);
|
|
|
|
if (ptep) {
|
2016-03-08 11:12:18 +00:00
|
|
|
pte = *ptep;
|
|
|
|
if (pte_present(pte) && (pte_val(pte) & _PAGE_READ)) {
|
|
|
|
address = pte_val(pte) & PAGE_MASK;
|
|
|
|
address += gaddr & ~PAGE_MASK;
|
|
|
|
*val = *(unsigned long *) address;
|
|
|
|
pte_val(*ptep) |= _PAGE_YOUNG;
|
|
|
|
/* Do *NOT* clear the _PAGE_INVALID bit! */
|
|
|
|
rc = 0;
|
|
|
|
}
|
2016-03-08 10:54:42 +00:00
|
|
|
gmap_pte_op_end(ptl);
|
2016-03-08 10:49:57 +00:00
|
|
|
}
|
2016-03-08 11:12:18 +00:00
|
|
|
if (!rc)
|
|
|
|
break;
|
|
|
|
vmaddr = __gmap_translate(gmap, gaddr);
|
|
|
|
if (IS_ERR_VALUE(vmaddr)) {
|
|
|
|
rc = vmaddr;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
rc = gmap_pte_op_fixup(gmap, gaddr, vmaddr);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_read_table);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_insert_rmap - add a rmap to the host_to_rmap radix tree
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @vmaddr: vm address associated with the rmap
|
|
|
|
* @rmap: pointer to the rmap structure
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static inline void gmap_insert_rmap(struct gmap *sg, unsigned long vmaddr,
|
|
|
|
struct gmap_rmap *rmap)
|
|
|
|
{
|
|
|
|
void **slot;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
slot = radix_tree_lookup_slot(&sg->host_to_rmap, vmaddr >> PAGE_SHIFT);
|
|
|
|
if (slot) {
|
|
|
|
rmap->next = radix_tree_deref_slot_protected(slot,
|
|
|
|
&sg->guest_table_lock);
|
|
|
|
radix_tree_replace_slot(slot, rmap);
|
|
|
|
} else {
|
|
|
|
rmap->next = NULL;
|
|
|
|
radix_tree_insert(&sg->host_to_rmap, vmaddr >> PAGE_SHIFT,
|
|
|
|
rmap);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_protect_rmap - modify access rights to memory and create an rmap
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow gmap
|
|
|
|
* @paddr: address in the parent guest address space
|
|
|
|
* @len: length of the memory area to protect
|
|
|
|
* @prot: indicates access rights: none, read-only or read-write
|
|
|
|
*
|
|
|
|
* Returns 0 if successfully protected and the rmap was created, -ENOMEM
|
|
|
|
* if out of memory and -EFAULT if paddr is invalid.
|
|
|
|
*/
|
|
|
|
static int gmap_protect_rmap(struct gmap *sg, unsigned long raddr,
|
|
|
|
unsigned long paddr, unsigned long len, int prot)
|
|
|
|
{
|
|
|
|
struct gmap *parent;
|
|
|
|
struct gmap_rmap *rmap;
|
|
|
|
unsigned long vmaddr;
|
|
|
|
spinlock_t *ptl;
|
|
|
|
pte_t *ptep;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
parent = sg->parent;
|
|
|
|
while (len) {
|
|
|
|
vmaddr = __gmap_translate(parent, paddr);
|
|
|
|
if (IS_ERR_VALUE(vmaddr))
|
|
|
|
return vmaddr;
|
|
|
|
rmap = kzalloc(sizeof(*rmap), GFP_KERNEL);
|
|
|
|
if (!rmap)
|
|
|
|
return -ENOMEM;
|
|
|
|
rmap->raddr = raddr;
|
|
|
|
rc = radix_tree_preload(GFP_KERNEL);
|
2016-03-08 10:54:42 +00:00
|
|
|
if (rc) {
|
2016-03-08 11:12:18 +00:00
|
|
|
kfree(rmap);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
rc = -EAGAIN;
|
|
|
|
ptep = gmap_pte_op_walk(parent, paddr, &ptl);
|
|
|
|
if (ptep) {
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
rc = ptep_force_prot(parent->mm, paddr, ptep, prot,
|
|
|
|
PGSTE_VSIE_BIT);
|
|
|
|
if (!rc)
|
|
|
|
gmap_insert_rmap(sg, vmaddr, rmap);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
gmap_pte_op_end(ptl);
|
|
|
|
}
|
|
|
|
radix_tree_preload_end();
|
|
|
|
if (rc) {
|
|
|
|
kfree(rmap);
|
|
|
|
rc = gmap_pte_op_fixup(parent, paddr, vmaddr);
|
2016-03-08 10:54:42 +00:00
|
|
|
if (rc)
|
2016-03-08 11:12:18 +00:00
|
|
|
return rc;
|
2016-03-08 10:49:57 +00:00
|
|
|
continue;
|
|
|
|
}
|
2016-03-08 11:12:18 +00:00
|
|
|
paddr += PAGE_SIZE;
|
2016-03-08 10:54:42 +00:00
|
|
|
len -= PAGE_SIZE;
|
2016-03-08 10:49:57 +00:00
|
|
|
}
|
2016-03-08 11:12:18 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define _SHADOW_RMAP_MASK 0x7
|
|
|
|
#define _SHADOW_RMAP_REGION1 0x5
|
|
|
|
#define _SHADOW_RMAP_REGION2 0x4
|
|
|
|
#define _SHADOW_RMAP_REGION3 0x3
|
|
|
|
#define _SHADOW_RMAP_SEGMENT 0x2
|
|
|
|
#define _SHADOW_RMAP_PGTABLE 0x1
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_idte_one - invalidate a single region or segment table entry
|
|
|
|
* @asce: region or segment table *origin* + table-type bits
|
|
|
|
* @vaddr: virtual address to identify the table entry to flush
|
|
|
|
*
|
|
|
|
* The invalid bit of a single region or segment table entry is set
|
|
|
|
* and the associated TLB entries depending on the entry are flushed.
|
|
|
|
* The table-type of the @asce identifies the portion of the @vaddr
|
|
|
|
* that is used as the invalidation index.
|
|
|
|
*/
|
|
|
|
static inline void gmap_idte_one(unsigned long asce, unsigned long vaddr)
|
|
|
|
{
|
|
|
|
asm volatile(
|
|
|
|
" .insn rrf,0xb98e0000,%0,%1,0,0"
|
|
|
|
: : "a" (asce), "a" (vaddr) : "cc", "memory");
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unshadow_page - remove a page from a shadow page table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void gmap_unshadow_page(struct gmap *sg, unsigned long raddr)
|
|
|
|
{
|
|
|
|
unsigned long *table;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
table = gmap_table_walk(sg, raddr, 0); /* get page table pointer */
|
|
|
|
if (!table || *table & _PAGE_INVALID)
|
|
|
|
return;
|
|
|
|
gmap_call_notifier(sg, raddr, raddr + (1UL << 12) - 1);
|
|
|
|
ptep_unshadow_pte(sg->mm, raddr, (pte_t *) table);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __gmap_unshadow_pgt - remove all entries from a shadow page table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
* @pgt: pointer to the start of a shadow page table
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void __gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr,
|
|
|
|
unsigned long *pgt)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
for (i = 0; i < 256; i++, raddr += 1UL << 12)
|
|
|
|
pgt[i] = _PAGE_INVALID;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unshadow_pgt - remove a shadow page table from a segment entry
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: address in the shadow guest address space
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
|
|
|
|
{
|
|
|
|
unsigned long sto, *ste, *pgt;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
ste = gmap_table_walk(sg, raddr, 1); /* get segment pointer */
|
|
|
|
if (!ste || *ste & _SEGMENT_ENTRY_INVALID)
|
|
|
|
return;
|
|
|
|
gmap_call_notifier(sg, raddr, raddr + (1UL << 20) - 1);
|
|
|
|
sto = (unsigned long) (ste - ((raddr >> 20) & 0x7ff));
|
|
|
|
gmap_idte_one(sto | _ASCE_TYPE_SEGMENT, raddr);
|
|
|
|
pgt = (unsigned long *)(*ste & _SEGMENT_ENTRY_ORIGIN);
|
|
|
|
*ste = _SEGMENT_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_pgt(sg, raddr, pgt);
|
|
|
|
/* Free page table */
|
|
|
|
page = pfn_to_page(__pa(pgt) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
page_table_free_pgste(page);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __gmap_unshadow_sgt - remove all entries from a shadow segment table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
* @sgt: pointer to the start of a shadow segment table
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
|
|
|
|
unsigned long *sgt)
|
|
|
|
{
|
|
|
|
unsigned long asce, *pgt;
|
|
|
|
struct page *page;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
asce = (unsigned long) sgt | _ASCE_TYPE_SEGMENT;
|
|
|
|
for (i = 0; i < 2048; i++, raddr += 1UL << 20) {
|
|
|
|
if (sgt[i] & _SEGMENT_ENTRY_INVALID)
|
|
|
|
continue;
|
|
|
|
pgt = (unsigned long *)(sgt[i] & _REGION_ENTRY_ORIGIN);
|
|
|
|
sgt[i] = _SEGMENT_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_pgt(sg, raddr, pgt);
|
|
|
|
/* Free page table */
|
|
|
|
page = pfn_to_page(__pa(pgt) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
page_table_free_pgste(page);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unshadow_sgt - remove a shadow segment table from a region-3 entry
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
*
|
|
|
|
* Called with the shadow->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
|
|
|
|
{
|
|
|
|
unsigned long r3o, *r3e, *sgt;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
r3e = gmap_table_walk(sg, raddr, 2); /* get region-3 pointer */
|
|
|
|
if (!r3e || *r3e & _REGION_ENTRY_INVALID)
|
|
|
|
return;
|
|
|
|
gmap_call_notifier(sg, raddr, raddr + (1UL << 31) - 1);
|
|
|
|
r3o = (unsigned long) (r3e - ((raddr >> 31) & 0x7ff));
|
|
|
|
gmap_idte_one(r3o | _ASCE_TYPE_REGION3, raddr);
|
|
|
|
sgt = (unsigned long *)(*r3e & _REGION_ENTRY_ORIGIN);
|
|
|
|
*r3e = _REGION3_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_sgt(sg, raddr, sgt);
|
|
|
|
/* Free segment table */
|
|
|
|
page = pfn_to_page(__pa(sgt) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __gmap_unshadow_r3t - remove all entries from a shadow region-3 table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: address in the shadow guest address space
|
|
|
|
* @r3t: pointer to the start of a shadow region-3 table
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr,
|
|
|
|
unsigned long *r3t)
|
|
|
|
{
|
|
|
|
unsigned long asce, *sgt;
|
|
|
|
struct page *page;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
asce = (unsigned long) r3t | _ASCE_TYPE_REGION3;
|
|
|
|
for (i = 0; i < 2048; i++, raddr += 1UL << 31) {
|
|
|
|
if (r3t[i] & _REGION_ENTRY_INVALID)
|
|
|
|
continue;
|
|
|
|
sgt = (unsigned long *)(r3t[i] & _REGION_ENTRY_ORIGIN);
|
|
|
|
r3t[i] = _REGION3_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_sgt(sg, raddr, sgt);
|
|
|
|
/* Free segment table */
|
|
|
|
page = pfn_to_page(__pa(sgt) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unshadow_r3t - remove a shadow region-3 table from a region-2 entry
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
|
|
|
|
{
|
|
|
|
unsigned long r2o, *r2e, *r3t;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
r2e = gmap_table_walk(sg, raddr, 3); /* get region-2 pointer */
|
|
|
|
if (!r2e || *r2e & _REGION_ENTRY_INVALID)
|
|
|
|
return;
|
|
|
|
gmap_call_notifier(sg, raddr, raddr + (1UL << 42) - 1);
|
|
|
|
r2o = (unsigned long) (r2e - ((raddr >> 42) & 0x7ff));
|
|
|
|
gmap_idte_one(r2o | _ASCE_TYPE_REGION2, raddr);
|
|
|
|
r3t = (unsigned long *)(*r2e & _REGION_ENTRY_ORIGIN);
|
|
|
|
*r2e = _REGION2_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_r3t(sg, raddr, r3t);
|
|
|
|
/* Free region 3 table */
|
|
|
|
page = pfn_to_page(__pa(r3t) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __gmap_unshadow_r2t - remove all entries from a shadow region-2 table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
* @r2t: pointer to the start of a shadow region-2 table
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
|
|
|
|
unsigned long *r2t)
|
|
|
|
{
|
|
|
|
unsigned long asce, *r3t;
|
|
|
|
struct page *page;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
asce = (unsigned long) r2t | _ASCE_TYPE_REGION2;
|
|
|
|
for (i = 0; i < 2048; i++, raddr += 1UL << 42) {
|
|
|
|
if (r2t[i] & _REGION_ENTRY_INVALID)
|
|
|
|
continue;
|
|
|
|
r3t = (unsigned long *)(r2t[i] & _REGION_ENTRY_ORIGIN);
|
|
|
|
r2t[i] = _REGION2_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_r3t(sg, raddr, r3t);
|
|
|
|
/* Free region 3 table */
|
|
|
|
page = pfn_to_page(__pa(r3t) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unshadow_r2t - remove a shadow region-2 table from a region-1 entry
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
*
|
|
|
|
* Called with the sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr)
|
|
|
|
{
|
|
|
|
unsigned long r1o, *r1e, *r2t;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
r1e = gmap_table_walk(sg, raddr, 4); /* get region-1 pointer */
|
|
|
|
if (!r1e || *r1e & _REGION_ENTRY_INVALID)
|
|
|
|
return;
|
|
|
|
gmap_call_notifier(sg, raddr, raddr + (1UL << 53) - 1);
|
|
|
|
r1o = (unsigned long) (r1e - ((raddr >> 53) & 0x7ff));
|
|
|
|
gmap_idte_one(r1o | _ASCE_TYPE_REGION1, raddr);
|
|
|
|
r2t = (unsigned long *)(*r1e & _REGION_ENTRY_ORIGIN);
|
|
|
|
*r1e = _REGION1_ENTRY_EMPTY;
|
|
|
|
__gmap_unshadow_r2t(sg, raddr, r2t);
|
|
|
|
/* Free region 2 table */
|
|
|
|
page = pfn_to_page(__pa(r2t) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* __gmap_unshadow_r1t - remove all entries from a shadow region-1 table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @raddr: rmap address in the shadow guest address space
|
|
|
|
* @r1t: pointer to the start of a shadow region-1 table
|
|
|
|
*
|
|
|
|
* Called with the shadow->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void __gmap_unshadow_r1t(struct gmap *sg, unsigned long raddr,
|
|
|
|
unsigned long *r1t)
|
|
|
|
{
|
|
|
|
unsigned long asce, *r2t;
|
|
|
|
struct page *page;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
asce = (unsigned long) r1t | _ASCE_TYPE_REGION1;
|
|
|
|
for (i = 0; i < 2048; i++, raddr += 1UL << 53) {
|
|
|
|
if (r1t[i] & _REGION_ENTRY_INVALID)
|
|
|
|
continue;
|
|
|
|
r2t = (unsigned long *)(r1t[i] & _REGION_ENTRY_ORIGIN);
|
|
|
|
__gmap_unshadow_r2t(sg, raddr, r2t);
|
|
|
|
/* Clear entry and flush translation r1t -> r2t */
|
|
|
|
gmap_idte_one(asce, raddr);
|
|
|
|
r1t[i] = _REGION1_ENTRY_EMPTY;
|
|
|
|
/* Free region 2 table */
|
|
|
|
page = pfn_to_page(__pa(r2t) >> PAGE_SHIFT);
|
|
|
|
list_del(&page->lru);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_unshadow - remove a shadow page table completely
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
*
|
|
|
|
* Called with sg->guest_table_lock
|
|
|
|
*/
|
|
|
|
static void gmap_unshadow(struct gmap *sg)
|
|
|
|
{
|
|
|
|
unsigned long *table;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
if (sg->removed)
|
|
|
|
return;
|
|
|
|
sg->removed = 1;
|
|
|
|
gmap_call_notifier(sg, 0, -1UL);
|
2016-04-15 10:45:45 +00:00
|
|
|
gmap_flush_tlb(sg);
|
2016-03-08 11:12:18 +00:00
|
|
|
table = (unsigned long *)(sg->asce & _ASCE_ORIGIN);
|
|
|
|
switch (sg->asce & _ASCE_TYPE_MASK) {
|
|
|
|
case _ASCE_TYPE_REGION1:
|
|
|
|
__gmap_unshadow_r1t(sg, 0, table);
|
|
|
|
break;
|
|
|
|
case _ASCE_TYPE_REGION2:
|
|
|
|
__gmap_unshadow_r2t(sg, 0, table);
|
|
|
|
break;
|
|
|
|
case _ASCE_TYPE_REGION3:
|
|
|
|
__gmap_unshadow_r3t(sg, 0, table);
|
|
|
|
break;
|
|
|
|
case _ASCE_TYPE_SEGMENT:
|
|
|
|
__gmap_unshadow_sgt(sg, 0, table);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_find_shadow - find a specific asce in the list of shadow tables
|
|
|
|
* @parent: pointer to the parent gmap
|
|
|
|
* @asce: ASCE for which the shadow table is created
|
|
|
|
*
|
|
|
|
* Returns the pointer to a gmap if a shadow table with the given asce is
|
|
|
|
* already available, otherwise NULL
|
|
|
|
*/
|
|
|
|
static struct gmap *gmap_find_shadow(struct gmap *parent, unsigned long asce)
|
|
|
|
{
|
|
|
|
struct gmap *sg;
|
|
|
|
|
|
|
|
list_for_each_entry(sg, &parent->children, list) {
|
|
|
|
if (sg->orig_asce != asce || sg->removed)
|
|
|
|
continue;
|
|
|
|
atomic_inc(&sg->ref_count);
|
|
|
|
return sg;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow - create/find a shadow guest address space
|
|
|
|
* @parent: pointer to the parent gmap
|
|
|
|
* @asce: ASCE for which the shadow table is created
|
|
|
|
*
|
|
|
|
* The pages of the top level page table referred by the asce parameter
|
|
|
|
* will be set to read-only and marked in the PGSTEs of the kvm process.
|
|
|
|
* The shadow table will be removed automatically on any change to the
|
|
|
|
* PTE mapping for the source table.
|
|
|
|
*
|
|
|
|
* Returns a guest address space structure, NULL if out of memory or if
|
|
|
|
* anything goes wrong while protecting the top level pages.
|
|
|
|
*/
|
|
|
|
struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce)
|
|
|
|
{
|
|
|
|
struct gmap *sg, *new;
|
|
|
|
unsigned long limit;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(gmap_is_shadow(parent));
|
|
|
|
spin_lock(&parent->shadow_lock);
|
|
|
|
sg = gmap_find_shadow(parent, asce);
|
|
|
|
spin_unlock(&parent->shadow_lock);
|
|
|
|
if (sg)
|
|
|
|
return sg;
|
|
|
|
/* Create a new shadow gmap */
|
|
|
|
limit = -1UL >> (33 - (((asce & _ASCE_TYPE_MASK) >> 2) * 11));
|
|
|
|
new = gmap_alloc(limit);
|
|
|
|
if (!new)
|
|
|
|
return NULL;
|
|
|
|
new->mm = parent->mm;
|
|
|
|
new->parent = gmap_get(parent);
|
|
|
|
new->orig_asce = asce;
|
|
|
|
down_read(&parent->mm->mmap_sem);
|
|
|
|
rc = gmap_protect_range(parent, asce & _ASCE_ORIGIN,
|
|
|
|
((asce & _ASCE_TABLE_LENGTH) + 1) * 4096,
|
|
|
|
PROT_READ, PGSTE_VSIE_BIT);
|
|
|
|
up_read(&parent->mm->mmap_sem);
|
|
|
|
if (rc) {
|
|
|
|
atomic_set(&new->ref_count, 2);
|
|
|
|
spin_lock(&parent->shadow_lock);
|
|
|
|
/* Recheck if another CPU created the same shadow */
|
|
|
|
sg = gmap_find_shadow(parent, asce);
|
|
|
|
if (!sg) {
|
|
|
|
list_add(&new->list, &parent->children);
|
|
|
|
sg = new;
|
|
|
|
new = NULL;
|
|
|
|
}
|
|
|
|
spin_unlock(&parent->shadow_lock);
|
|
|
|
}
|
|
|
|
if (new)
|
|
|
|
gmap_free(new);
|
|
|
|
return sg;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_r2t - create an empty shadow region 2 table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @saddr: faulting address in the shadow gmap
|
|
|
|
* @r2t: parent gmap address of the region 2 table to get shadowed
|
|
|
|
*
|
|
|
|
* The r2t parameter specifies the address of the source table. The
|
|
|
|
* four pages of the source table are made read-only in the parent gmap
|
|
|
|
* address space. A write to the source table area @r2t will automatically
|
|
|
|
* remove the shadow r2 table and all of its decendents.
|
|
|
|
*
|
|
|
|
* Returns 0 if successfully shadowed or already shadowed, -EAGAIN if the
|
|
|
|
* shadow table structure is incomplete, -ENOMEM if out of memory and
|
|
|
|
* -EFAULT if an address in the parent gmap could not be resolved.
|
|
|
|
*
|
|
|
|
* Called with sg->mm->mmap_sem in read.
|
|
|
|
*/
|
|
|
|
int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t)
|
|
|
|
{
|
|
|
|
unsigned long raddr, origin, offset, len;
|
|
|
|
unsigned long *s_r2t, *table;
|
|
|
|
struct page *page;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
/* Allocate a shadow region second table */
|
|
|
|
page = alloc_pages(GFP_KERNEL, 2);
|
|
|
|
if (!page)
|
|
|
|
return -ENOMEM;
|
|
|
|
page->index = r2t & _REGION_ENTRY_ORIGIN;
|
|
|
|
s_r2t = (unsigned long *) page_to_phys(page);
|
|
|
|
/* Install shadow region second table */
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
table = gmap_table_walk(sg, saddr, 4); /* get region-1 pointer */
|
|
|
|
if (!table) {
|
|
|
|
rc = -EAGAIN; /* Race with unshadow */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
if (!(*table & _REGION_ENTRY_INVALID)) {
|
|
|
|
rc = 0; /* Already established */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
crst_table_init(s_r2t, _REGION2_ENTRY_EMPTY);
|
|
|
|
*table = (unsigned long) s_r2t |
|
|
|
|
_REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R1;
|
|
|
|
list_add(&page->lru, &sg->crst_list);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
/* Make r2t read-only in parent gmap page table */
|
|
|
|
raddr = (saddr & 0xffe0000000000000UL) | _SHADOW_RMAP_REGION1;
|
|
|
|
origin = r2t & _REGION_ENTRY_ORIGIN;
|
|
|
|
offset = ((r2t & _REGION_ENTRY_OFFSET) >> 6) * 4096;
|
|
|
|
len = ((r2t & _REGION_ENTRY_LENGTH) + 1) * 4096 - offset;
|
|
|
|
rc = gmap_protect_rmap(sg, raddr, origin + offset, len, PROT_READ);
|
|
|
|
if (rc) {
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
gmap_unshadow_r2t(sg, raddr);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
out_free:
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
__free_pages(page, 2);
|
2016-03-08 10:49:57 +00:00
|
|
|
return rc;
|
|
|
|
}
|
2016-03-08 11:12:18 +00:00
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow_r2t);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_r3t - create a shadow region 3 table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @saddr: faulting address in the shadow gmap
|
|
|
|
* @r3t: parent gmap address of the region 3 table to get shadowed
|
|
|
|
*
|
|
|
|
* Returns 0 if successfully shadowed or already shadowed, -EAGAIN if the
|
|
|
|
* shadow table structure is incomplete, -ENOMEM if out of memory and
|
|
|
|
* -EFAULT if an address in the parent gmap could not be resolved.
|
|
|
|
*
|
|
|
|
* Called with sg->mm->mmap_sem in read.
|
|
|
|
*/
|
|
|
|
int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t)
|
|
|
|
{
|
|
|
|
unsigned long raddr, origin, offset, len;
|
|
|
|
unsigned long *s_r3t, *table;
|
|
|
|
struct page *page;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
/* Allocate a shadow region second table */
|
|
|
|
page = alloc_pages(GFP_KERNEL, 2);
|
|
|
|
if (!page)
|
|
|
|
return -ENOMEM;
|
|
|
|
page->index = r3t & _REGION_ENTRY_ORIGIN;
|
|
|
|
s_r3t = (unsigned long *) page_to_phys(page);
|
|
|
|
/* Install shadow region second table */
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
table = gmap_table_walk(sg, saddr, 3); /* get region-2 pointer */
|
|
|
|
if (!table) {
|
|
|
|
rc = -EAGAIN; /* Race with unshadow */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
if (!(*table & _REGION_ENTRY_INVALID)) {
|
|
|
|
rc = 0; /* Already established */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
crst_table_init(s_r3t, _REGION3_ENTRY_EMPTY);
|
|
|
|
*table = (unsigned long) s_r3t |
|
|
|
|
_REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R2;
|
|
|
|
list_add(&page->lru, &sg->crst_list);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
/* Make r3t read-only in parent gmap page table */
|
|
|
|
raddr = (saddr & 0xfffffc0000000000UL) | _SHADOW_RMAP_REGION2;
|
|
|
|
origin = r3t & _REGION_ENTRY_ORIGIN;
|
|
|
|
offset = ((r3t & _REGION_ENTRY_OFFSET) >> 6) * 4096;
|
|
|
|
len = ((r3t & _REGION_ENTRY_LENGTH) + 1) * 4096 - offset;
|
|
|
|
rc = gmap_protect_rmap(sg, raddr, origin + offset, len, PROT_READ);
|
|
|
|
if (rc) {
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
gmap_unshadow_r3t(sg, raddr);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
out_free:
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow_r3t);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_sgt - create a shadow segment table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @saddr: faulting address in the shadow gmap
|
|
|
|
* @sgt: parent gmap address of the segment table to get shadowed
|
|
|
|
*
|
|
|
|
* Returns: 0 if successfully shadowed or already shadowed, -EAGAIN if the
|
|
|
|
* shadow table structure is incomplete, -ENOMEM if out of memory and
|
|
|
|
* -EFAULT if an address in the parent gmap could not be resolved.
|
|
|
|
*
|
|
|
|
* Called with sg->mm->mmap_sem in read.
|
|
|
|
*/
|
|
|
|
int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt)
|
|
|
|
{
|
|
|
|
unsigned long raddr, origin, offset, len;
|
|
|
|
unsigned long *s_sgt, *table;
|
|
|
|
struct page *page;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
/* Allocate a shadow segment table */
|
|
|
|
page = alloc_pages(GFP_KERNEL, 2);
|
|
|
|
if (!page)
|
|
|
|
return -ENOMEM;
|
|
|
|
page->index = sgt & _REGION_ENTRY_ORIGIN;
|
|
|
|
s_sgt = (unsigned long *) page_to_phys(page);
|
|
|
|
/* Install shadow region second table */
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
table = gmap_table_walk(sg, saddr, 2); /* get region-3 pointer */
|
|
|
|
if (!table) {
|
|
|
|
rc = -EAGAIN; /* Race with unshadow */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
if (!(*table & _REGION_ENTRY_INVALID)) {
|
|
|
|
rc = 0; /* Already established */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
crst_table_init(s_sgt, _SEGMENT_ENTRY_EMPTY);
|
|
|
|
*table = (unsigned long) s_sgt |
|
|
|
|
_REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R3;
|
|
|
|
list_add(&page->lru, &sg->crst_list);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
/* Make sgt read-only in parent gmap page table */
|
|
|
|
raddr = (saddr & 0xffffffff80000000UL) | _SHADOW_RMAP_REGION3;
|
|
|
|
origin = sgt & _REGION_ENTRY_ORIGIN;
|
|
|
|
offset = ((sgt & _REGION_ENTRY_OFFSET) >> 6) * 4096;
|
|
|
|
len = ((sgt & _REGION_ENTRY_LENGTH) + 1) * 4096 - offset;
|
|
|
|
rc = gmap_protect_rmap(sg, raddr, origin + offset, len, PROT_READ);
|
|
|
|
if (rc) {
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
gmap_unshadow_sgt(sg, raddr);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
out_free:
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
__free_pages(page, 2);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow_sgt);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_lookup_pgtable - find a shadow page table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @saddr: the address in the shadow aguest address space
|
|
|
|
* @pgt: parent gmap address of the page table to get shadowed
|
|
|
|
* @dat_protection: if the pgtable is marked as protected by dat
|
|
|
|
*
|
|
|
|
* Returns 0 if the shadow page table was found and -EAGAIN if the page
|
|
|
|
* table was not found.
|
|
|
|
*
|
|
|
|
* Called with sg->mm->mmap_sem in read.
|
|
|
|
*/
|
|
|
|
int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr,
|
|
|
|
unsigned long *pgt, int *dat_protection)
|
|
|
|
{
|
|
|
|
unsigned long *table;
|
|
|
|
struct page *page;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
table = gmap_table_walk(sg, saddr, 1); /* get segment pointer */
|
|
|
|
if (table && !(*table & _SEGMENT_ENTRY_INVALID)) {
|
|
|
|
/* Shadow page tables are full pages (pte+pgste) */
|
|
|
|
page = pfn_to_page(*table >> PAGE_SHIFT);
|
|
|
|
*pgt = page->index;
|
|
|
|
*dat_protection = !!(*table & _SEGMENT_ENTRY_PROTECT);
|
|
|
|
rc = 0;
|
|
|
|
} else {
|
|
|
|
rc = -EAGAIN;
|
|
|
|
}
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow_pgt_lookup);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_pgt - instantiate a shadow page table
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @saddr: faulting address in the shadow gmap
|
|
|
|
* @pgt: parent gmap address of the page table to get shadowed
|
|
|
|
*
|
|
|
|
* Returns 0 if successfully shadowed or already shadowed, -EAGAIN if the
|
|
|
|
* shadow table structure is incomplete, -ENOMEM if out of memory,
|
|
|
|
* -EFAULT if an address in the parent gmap could not be resolved and
|
|
|
|
*
|
|
|
|
* Called with gmap->mm->mmap_sem in read
|
|
|
|
*/
|
|
|
|
int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt)
|
|
|
|
{
|
|
|
|
unsigned long raddr, origin;
|
|
|
|
unsigned long *s_pgt, *table;
|
|
|
|
struct page *page;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
/* Allocate a shadow page table */
|
|
|
|
page = page_table_alloc_pgste(sg->mm);
|
|
|
|
if (!page)
|
|
|
|
return -ENOMEM;
|
|
|
|
page->index = pgt & _SEGMENT_ENTRY_ORIGIN;
|
|
|
|
s_pgt = (unsigned long *) page_to_phys(page);
|
|
|
|
/* Install shadow page table */
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
table = gmap_table_walk(sg, saddr, 1); /* get segment pointer */
|
|
|
|
if (!table) {
|
|
|
|
rc = -EAGAIN; /* Race with unshadow */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
if (!(*table & _SEGMENT_ENTRY_INVALID)) {
|
|
|
|
rc = 0; /* Already established */
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
*table = (unsigned long) s_pgt | _SEGMENT_ENTRY |
|
|
|
|
(pgt & _SEGMENT_ENTRY_PROTECT);
|
|
|
|
list_add(&page->lru, &sg->pt_list);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
/* Make pgt read-only in parent gmap page table (not the pgste) */
|
|
|
|
raddr = (saddr & 0xfffffffffff00000UL) | _SHADOW_RMAP_SEGMENT;
|
|
|
|
origin = pgt & _SEGMENT_ENTRY_ORIGIN & PAGE_MASK;
|
|
|
|
rc = gmap_protect_rmap(sg, raddr, origin, PAGE_SIZE, PROT_READ);
|
|
|
|
if (rc) {
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
gmap_unshadow_pgt(sg, raddr);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
out_free:
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
page_table_free_pgste(page);
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow_pgt);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_page - create a shadow page mapping
|
|
|
|
* @sg: pointer to the shadow guest address space structure
|
|
|
|
* @saddr: faulting address in the shadow gmap
|
|
|
|
* @paddr: parent gmap address to get mapped at @saddr
|
|
|
|
* @write: =1 map r/w, =0 map r/o
|
|
|
|
*
|
|
|
|
* Returns 0 if successfully shadowed or already shadowed, -EAGAIN if the
|
|
|
|
* shadow table structure is incomplete, -ENOMEM if out of memory and
|
|
|
|
* -EFAULT if an address in the parent gmap could not be resolved.
|
|
|
|
*
|
|
|
|
* Called with sg->mm->mmap_sem in read.
|
|
|
|
*/
|
|
|
|
int gmap_shadow_page(struct gmap *sg, unsigned long saddr,
|
|
|
|
unsigned long paddr, int write)
|
|
|
|
{
|
|
|
|
struct gmap *parent;
|
|
|
|
struct gmap_rmap *rmap;
|
|
|
|
unsigned long vmaddr;
|
|
|
|
spinlock_t *ptl;
|
|
|
|
pte_t *sptep, *tptep;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
parent = sg->parent;
|
|
|
|
|
|
|
|
rmap = kzalloc(sizeof(*rmap), GFP_KERNEL);
|
|
|
|
if (!rmap)
|
|
|
|
return -ENOMEM;
|
|
|
|
rmap->raddr = (saddr & PAGE_MASK) | _SHADOW_RMAP_PGTABLE;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
vmaddr = __gmap_translate(parent, paddr);
|
|
|
|
if (IS_ERR_VALUE(vmaddr)) {
|
|
|
|
rc = vmaddr;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
rc = radix_tree_preload(GFP_KERNEL);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
rc = -EAGAIN;
|
|
|
|
sptep = gmap_pte_op_walk(parent, paddr, &ptl);
|
|
|
|
if (sptep) {
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
/* Get page table pointer */
|
|
|
|
tptep = (pte_t *) gmap_table_walk(sg, saddr, 0);
|
|
|
|
if (!tptep) {
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
gmap_pte_op_end(ptl);
|
|
|
|
radix_tree_preload_end();
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
rc = ptep_shadow_pte(sg->mm, saddr,
|
|
|
|
sptep, tptep, write);
|
|
|
|
if (rc > 0) {
|
|
|
|
/* Success and a new mapping */
|
|
|
|
gmap_insert_rmap(sg, vmaddr, rmap);
|
|
|
|
rmap = NULL;
|
|
|
|
rc = 0;
|
|
|
|
}
|
|
|
|
gmap_pte_op_end(ptl);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
}
|
|
|
|
radix_tree_preload_end();
|
|
|
|
if (!rc)
|
|
|
|
break;
|
|
|
|
rc = gmap_pte_op_fixup(parent, paddr, vmaddr);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
kfree(rmap);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(gmap_shadow_page);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gmap_shadow_notify - handle notifications for shadow gmap
|
|
|
|
*
|
|
|
|
* Called with sg->parent->shadow_lock.
|
|
|
|
*/
|
|
|
|
static void gmap_shadow_notify(struct gmap *sg, unsigned long vmaddr,
|
|
|
|
unsigned long offset, pte_t *pte)
|
|
|
|
{
|
|
|
|
struct gmap_rmap *rmap, *rnext, *head;
|
|
|
|
unsigned long gaddr, start, end, bits, raddr;
|
|
|
|
unsigned long *table;
|
|
|
|
|
|
|
|
BUG_ON(!gmap_is_shadow(sg));
|
|
|
|
spin_lock(&sg->parent->guest_table_lock);
|
|
|
|
table = radix_tree_lookup(&sg->parent->host_to_guest,
|
|
|
|
vmaddr >> PMD_SHIFT);
|
|
|
|
gaddr = table ? __gmap_segment_gaddr(table) + offset : 0;
|
|
|
|
spin_unlock(&sg->parent->guest_table_lock);
|
|
|
|
if (!table)
|
|
|
|
return;
|
|
|
|
|
|
|
|
spin_lock(&sg->guest_table_lock);
|
|
|
|
if (sg->removed) {
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* Check for top level table */
|
|
|
|
start = sg->orig_asce & _ASCE_ORIGIN;
|
|
|
|
end = start + ((sg->orig_asce & _ASCE_TABLE_LENGTH) + 1) * 4096;
|
|
|
|
if (gaddr >= start && gaddr < end) {
|
|
|
|
/* The complete shadow table has to go */
|
|
|
|
gmap_unshadow(sg);
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
list_del(&sg->list);
|
|
|
|
gmap_put(sg);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* Remove the page table tree from on specific entry */
|
|
|
|
head = radix_tree_delete(&sg->host_to_rmap, vmaddr >> 12);
|
|
|
|
gmap_for_each_rmap_safe(rmap, rnext, head) {
|
|
|
|
bits = rmap->raddr & _SHADOW_RMAP_MASK;
|
|
|
|
raddr = rmap->raddr ^ bits;
|
|
|
|
switch (bits) {
|
|
|
|
case _SHADOW_RMAP_REGION1:
|
|
|
|
gmap_unshadow_r2t(sg, raddr);
|
|
|
|
break;
|
|
|
|
case _SHADOW_RMAP_REGION2:
|
|
|
|
gmap_unshadow_r3t(sg, raddr);
|
|
|
|
break;
|
|
|
|
case _SHADOW_RMAP_REGION3:
|
|
|
|
gmap_unshadow_sgt(sg, raddr);
|
|
|
|
break;
|
|
|
|
case _SHADOW_RMAP_SEGMENT:
|
|
|
|
gmap_unshadow_pgt(sg, raddr);
|
|
|
|
break;
|
|
|
|
case _SHADOW_RMAP_PGTABLE:
|
|
|
|
gmap_unshadow_page(sg, raddr);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
kfree(rmap);
|
|
|
|
}
|
|
|
|
spin_unlock(&sg->guest_table_lock);
|
|
|
|
}
|
2016-03-08 10:49:57 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* ptep_notify - call all invalidation callbacks for a specific pte.
|
|
|
|
* @mm: pointer to the process mm_struct
|
|
|
|
* @addr: virtual address in the process address space
|
|
|
|
* @pte: pointer to the page table entry
|
2016-03-08 11:12:18 +00:00
|
|
|
* @bits: bits from the pgste that caused the notify call
|
2016-03-08 10:49:57 +00:00
|
|
|
*
|
|
|
|
* This function is assumed to be called with the page table lock held
|
|
|
|
* for the pte to notify.
|
|
|
|
*/
|
2016-03-08 11:12:18 +00:00
|
|
|
void ptep_notify(struct mm_struct *mm, unsigned long vmaddr,
|
|
|
|
pte_t *pte, unsigned long bits)
|
2016-03-08 10:49:57 +00:00
|
|
|
{
|
|
|
|
unsigned long offset, gaddr;
|
|
|
|
unsigned long *table;
|
2016-03-08 11:12:18 +00:00
|
|
|
struct gmap *gmap, *sg, *next;
|
2016-03-08 10:49:57 +00:00
|
|
|
|
|
|
|
offset = ((unsigned long) pte) & (255 * sizeof(pte_t));
|
|
|
|
offset = offset * (4096 / sizeof(pte_t));
|
2016-03-08 10:54:14 +00:00
|
|
|
rcu_read_lock();
|
|
|
|
list_for_each_entry_rcu(gmap, &mm->context.gmap_list, list) {
|
2016-03-08 11:12:18 +00:00
|
|
|
if (!list_empty(&gmap->children) && (bits & PGSTE_VSIE_BIT)) {
|
|
|
|
spin_lock(&gmap->shadow_lock);
|
|
|
|
list_for_each_entry_safe(sg, next,
|
|
|
|
&gmap->children, list)
|
|
|
|
gmap_shadow_notify(sg, vmaddr, offset, pte);
|
|
|
|
spin_unlock(&gmap->shadow_lock);
|
|
|
|
}
|
|
|
|
if (!(bits & PGSTE_IN_BIT))
|
|
|
|
continue;
|
2016-03-08 10:54:14 +00:00
|
|
|
spin_lock(&gmap->guest_table_lock);
|
2016-03-08 10:49:57 +00:00
|
|
|
table = radix_tree_lookup(&gmap->host_to_guest,
|
|
|
|
vmaddr >> PMD_SHIFT);
|
2016-03-08 10:54:14 +00:00
|
|
|
if (table)
|
|
|
|
gaddr = __gmap_segment_gaddr(table) + offset;
|
|
|
|
spin_unlock(&gmap->guest_table_lock);
|
|
|
|
if (table)
|
|
|
|
gmap_call_notifier(gmap, gaddr, gaddr + PAGE_SIZE - 1);
|
2016-03-08 10:49:57 +00:00
|
|
|
}
|
2016-03-08 10:54:14 +00:00
|
|
|
rcu_read_unlock();
|
2016-03-08 10:49:57 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ptep_notify);
|
|
|
|
|
|
|
|
static inline void thp_split_mm(struct mm_struct *mm)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
|
|
struct vm_area_struct *vma;
|
|
|
|
unsigned long addr;
|
|
|
|
|
|
|
|
for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
|
|
|
|
for (addr = vma->vm_start;
|
|
|
|
addr < vma->vm_end;
|
|
|
|
addr += PAGE_SIZE)
|
|
|
|
follow_page(vma, addr, FOLL_SPLIT);
|
|
|
|
vma->vm_flags &= ~VM_HUGEPAGE;
|
|
|
|
vma->vm_flags |= VM_NOHUGEPAGE;
|
|
|
|
}
|
|
|
|
mm->def_flags |= VM_NOHUGEPAGE;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* switch on pgstes for its userspace process (for kvm)
|
|
|
|
*/
|
|
|
|
int s390_enable_sie(void)
|
|
|
|
{
|
|
|
|
struct mm_struct *mm = current->mm;
|
|
|
|
|
|
|
|
/* Do we have pgstes? if yes, we are done */
|
|
|
|
if (mm_has_pgste(mm))
|
|
|
|
return 0;
|
|
|
|
/* Fail if the page tables are 2K */
|
|
|
|
if (!mm_alloc_pgste(mm))
|
|
|
|
return -EINVAL;
|
|
|
|
down_write(&mm->mmap_sem);
|
|
|
|
mm->context.has_pgste = 1;
|
|
|
|
/* split thp mappings and disable thp for future mappings */
|
|
|
|
thp_split_mm(mm);
|
|
|
|
up_write(&mm->mmap_sem);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(s390_enable_sie);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Enable storage key handling from now on and initialize the storage
|
|
|
|
* keys with the default key.
|
|
|
|
*/
|
|
|
|
static int __s390_enable_skey(pte_t *pte, unsigned long addr,
|
|
|
|
unsigned long next, struct mm_walk *walk)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Remove all zero page mappings,
|
|
|
|
* after establishing a policy to forbid zero page mappings
|
|
|
|
* following faults for that page will get fresh anonymous pages
|
|
|
|
*/
|
|
|
|
if (is_zero_pfn(pte_pfn(*pte)))
|
|
|
|
ptep_xchg_direct(walk->mm, addr, pte, __pte(_PAGE_INVALID));
|
|
|
|
/* Clear storage key */
|
|
|
|
ptep_zap_key(walk->mm, addr, pte);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int s390_enable_skey(void)
|
|
|
|
{
|
|
|
|
struct mm_walk walk = { .pte_entry = __s390_enable_skey };
|
|
|
|
struct mm_struct *mm = current->mm;
|
|
|
|
struct vm_area_struct *vma;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
down_write(&mm->mmap_sem);
|
|
|
|
if (mm_use_skey(mm))
|
|
|
|
goto out_up;
|
|
|
|
|
|
|
|
mm->context.use_skey = 1;
|
|
|
|
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
|
|
|
if (ksm_madvise(vma, vma->vm_start, vma->vm_end,
|
|
|
|
MADV_UNMERGEABLE, &vma->vm_flags)) {
|
|
|
|
mm->context.use_skey = 0;
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out_up;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
mm->def_flags &= ~VM_MERGEABLE;
|
|
|
|
|
|
|
|
walk.mm = mm;
|
|
|
|
walk_page_range(0, TASK_SIZE, &walk);
|
|
|
|
|
|
|
|
out_up:
|
|
|
|
up_write(&mm->mmap_sem);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(s390_enable_skey);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Reset CMMA state, make all pages stable again.
|
|
|
|
*/
|
|
|
|
static int __s390_reset_cmma(pte_t *pte, unsigned long addr,
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unsigned long next, struct mm_walk *walk)
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{
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ptep_zap_unused(walk->mm, addr, pte, 1);
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return 0;
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}
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void s390_reset_cmma(struct mm_struct *mm)
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{
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struct mm_walk walk = { .pte_entry = __s390_reset_cmma };
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down_write(&mm->mmap_sem);
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walk.mm = mm;
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walk_page_range(0, TASK_SIZE, &walk);
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up_write(&mm->mmap_sem);
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}
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EXPORT_SYMBOL_GPL(s390_reset_cmma);
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