2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
12 * All rights reserved.
14 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * This is free software. You are permitted to use,
17 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
19 #include <palacios/vmm.h>
22 #include <palacios/vmm_sym_swap.h>
23 #include <palacios/vmm_list.h>
24 #include <palacios/vm_guest.h>
26 #ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY
27 #include <palacios/vmm_telemetry.h>
30 // This is a hack and 32 bit linux specific.... need to fix...
33 uint32_t dev_index : 8;
34 uint32_t pg_index : 23;
38 struct shadow_pointer {
46 struct list_head node;
50 static uint_t swap_hash_fn(addr_t key) {
51 return v3_hash_long(key, 32);
55 static int swap_eq_fn(addr_t key1, addr_t key2) {
56 return (key1 == key2);
61 static inline uint32_t get_pg_index(pte32_t * pte) {
62 return ((struct swap_pte *)pte)->pg_index;
66 static inline uint32_t get_dev_index(pte32_t * pte) {
67 return ((struct swap_pte *)pte)->dev_index;
72 #ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY
73 static void telemetry_cb(struct guest_info * info, void * private_data, char * hdr) {
74 struct v3_sym_swap_state * swap_state = &(info->swap_state);
76 V3_Print("%sSymbiotic Swap:\n", hdr);
77 V3_Print("%s\tRead faults=%d\n", hdr, swap_state->read_faults);
78 V3_Print("%s\tWrite faults=%d\n", hdr, swap_state->write_faults);
79 V3_Print("%s\tMapped Pages=%d\n", hdr, swap_state->mapped_pages);
80 V3_Print("%s\tFlushes=%d\n", hdr, swap_state->flushes);
85 int v3_init_sym_swap(struct guest_info * info) {
86 struct v3_sym_swap_state * swap_state = &(info->swap_state);
88 memset(swap_state, 0, sizeof(struct v3_sym_swap_state));
89 swap_state->shdw_ptr_ht = v3_create_htable(0, swap_hash_fn, swap_eq_fn);
91 #ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY
92 if (info->enable_telemetry) {
93 v3_add_telemetry_cb(info, telemetry_cb, NULL);
97 PrintDebug("Initialized Symbiotic Swap\n");
103 int v3_register_swap_disk(struct guest_info * info, int dev_index,
104 struct v3_swap_ops * ops, void * private_data) {
105 struct v3_sym_swap_state * swap_state = &(info->swap_state);
107 swap_state->devs[dev_index].present = 1;
108 swap_state->devs[dev_index].private_data = private_data;
109 swap_state->devs[dev_index].ops = ops;
117 int v3_swap_in_notify(struct guest_info * info, int pg_index, int dev_index) {
118 struct list_head * shdw_ptr_list = NULL;
119 struct v3_sym_swap_state * swap_state = &(info->swap_state);
120 struct shadow_pointer * tmp_shdw_ptr = NULL;
121 struct shadow_pointer * shdw_ptr = NULL;
122 struct swap_pte guest_pte = {0, dev_index, pg_index};
124 shdw_ptr_list = (struct list_head * )v3_htable_search(swap_state->shdw_ptr_ht, *(addr_t *)&(guest_pte));
126 if (shdw_ptr_list == NULL) {
130 list_for_each_entry_safe(shdw_ptr, tmp_shdw_ptr, shdw_ptr_list, node) {
131 if ((shdw_ptr->pg_index == pg_index) &&
132 (shdw_ptr->dev_index == dev_index)) {
134 // Trigger faults for next shadow access
135 shdw_ptr->shadow_pte->present = 0;
137 // Delete entry from list
138 list_del(&(shdw_ptr->node));
148 int v3_swap_flush(struct guest_info * info) {
149 struct v3_sym_swap_state * swap_state = &(info->swap_state);
150 struct hashtable_iter * ht_iter = v3_create_htable_iter(swap_state->shdw_ptr_ht);
152 // PrintDebug("Flushing Symbiotic Swap table\n");
154 #ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY
155 swap_state->flushes++;
158 while (ht_iter->entry) {
159 struct shadow_pointer * tmp_shdw_ptr = NULL;
160 struct shadow_pointer * shdw_ptr = NULL;
161 struct list_head * shdw_ptr_list = (struct list_head *)v3_htable_get_iter_value(ht_iter);
163 // delete all swapped entries
164 // we can leave the list_head structures and reuse them for the next round
166 list_for_each_entry_safe(shdw_ptr, tmp_shdw_ptr, shdw_ptr_list, node) {
167 // Trigger faults for next shadow access
168 shdw_ptr->shadow_pte->present = 0;
170 // Delete entry from list
171 list_del(&(shdw_ptr->node));
175 v3_htable_iter_advance(ht_iter);
181 int v3_get_vaddr_perms(struct guest_info * info, addr_t vaddr, pte32_t * guest_pte, pf_error_t * page_perms) {
182 uint32_t pte_val = *(uint32_t *)guest_pte;
184 // symcall to check if page is in cache or on swap disk
185 if (v3_sym_call3(info, SYMCALL_MEM_LOOKUP, (uint64_t *)&vaddr, (uint64_t *)&pte_val, (uint64_t *)page_perms) == -1) {
186 PrintError("Sym call error?? that's weird... \n");
190 V3_Print("page perms = %x\n", *(uint32_t *)page_perms);
197 addr_t v3_get_swapped_pg_addr(struct guest_info * info, pte32_t * shadow_pte, pte32_t * guest_pte) {
198 struct list_head * shdw_ptr_list = NULL;
199 struct v3_sym_swap_state * swap_state = &(info->swap_state);
200 struct shadow_pointer * shdw_ptr = NULL;
201 void * swp_page_ptr = NULL;
202 int dev_index = get_dev_index(guest_pte);
203 struct v3_swap_dev * swp_dev = &(swap_state->devs[dev_index]);
205 if (! swp_dev->present ) {
211 swp_page_ptr = swp_dev->ops->get_swap_entry(get_pg_index(guest_pte), swp_dev->private_data);
213 if (swp_page_ptr == NULL) {
214 PrintError("Swapped out page not found on swap device\n");
218 shdw_ptr_list = (struct list_head *)v3_htable_search(swap_state->shdw_ptr_ht, (addr_t)*(uint32_t *)guest_pte);
220 if (shdw_ptr_list == NULL) {
221 shdw_ptr_list = (struct list_head *)V3_Malloc(sizeof(struct list_head *));
222 INIT_LIST_HEAD(shdw_ptr_list);
223 v3_htable_insert(swap_state->shdw_ptr_ht, (addr_t)*(uint32_t *)guest_pte, (addr_t)shdw_ptr_list);
226 shdw_ptr = (struct shadow_pointer *)V3_Malloc(sizeof(struct shadow_pointer));
228 shdw_ptr->shadow_pte = shadow_pte;
229 shdw_ptr->guest_pte = *(uint32_t *)guest_pte;
230 shdw_ptr->pg_index = get_pg_index(guest_pte);
231 shdw_ptr->dev_index = get_dev_index(guest_pte);
233 // We don't check for conflicts, because it should not happen...
234 list_add(&(shdw_ptr->node), shdw_ptr_list);
236 return PAGE_BASE_ADDR((addr_t)V3_PAddr(swp_page_ptr));