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".
21 #include <palacios/svm_io.h>
22 #include <palacios/vmm_io.h>
23 #include <palacios/vmm_ctrl_regs.h>
24 #include <palacios/vmm_decoder.h>
25 #include <palacios/vm_guest_mem.h>
27 #ifndef V3_CONFIG_DEBUG_IO
29 #define PrintDebug(fmt, args...)
33 static int update_map(struct v3_vm_info * vm, uint16_t port, int hook_read, int hook_write) {
34 uchar_t * bitmap = (uint8_t *)(vm->io_map.arch_data);;
38 if ((hook_read == 0) && (hook_write == 0)) {
39 *(bitmap + major) &= ~(0x1 << minor);
41 *(bitmap + major) |= (0x1 << minor);
48 int v3_init_svm_io_map(struct v3_vm_info * vm) {
49 vm->io_map.update_map = update_map;
51 vm->io_map.arch_data = V3_VAddr(V3_AllocPages(3));
52 memset(vm->io_map.arch_data, 0xff, PAGE_SIZE_4KB * 3);
55 v3_refresh_io_map(vm);
60 int v3_deinit_svm_io_map(struct v3_vm_info * vm) {
61 V3_FreePages(V3_PAddr(vm->io_map.arch_data), 3);
67 // This should package up an IO request and call vmm_handle_io
68 int v3_handle_svm_io_in(struct guest_info * core, struct svm_io_info * io_info) {
69 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
74 } else if (io_info->sz16) {
76 } else if (io_info->sz32) {
80 PrintDebug("IN of %d bytes on port %d (0x%x)\n", read_size, io_info->port, io_info->port);
83 PrintDebug("IN operation on unhooked IO port 0x%x - returning zero\n", io_info->port);
84 core->vm_regs.rax >>= 8*read_size;
85 core->vm_regs.rax <<= 8*read_size;
88 if (hook->read(core, io_info->port, &(core->vm_regs.rax), read_size, hook->priv_data) != read_size) {
89 // not sure how we handle errors.....
90 PrintError("Read Failure for in on port 0x%x\n", io_info->port);
103 /* We might not handle wrap around of the RDI register correctly...
104 * In that if we do wrap around the effect will manifest in the higher bits of the register
106 int v3_handle_svm_io_ins(struct guest_info * core, struct svm_io_info * io_info) {
107 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
112 struct v3_segment * theseg = &(core->segments.es); // default is ES
116 // This is kind of hacky...
117 // direction can equal either 1 or -1
118 // We will multiply the final added offset by this value to go the correct direction
120 struct rflags * flags = (struct rflags *)&(core->ctrl_regs.rflags);
127 if (v3_gva_to_hva(core, get_addr_linear(core, core->rip, &(core->segments.cs)), &inst_ptr) == -1) {
128 PrintError("Can't access instruction\n");
132 while (is_prefix_byte(*((char *)inst_ptr))) {
133 switch (*((char *)inst_ptr)) {
134 case PREFIX_CS_OVERRIDE:
135 theseg = &(core->segments.cs);
137 case PREFIX_SS_OVERRIDE:
138 theseg = &(core->segments.ss);
140 case PREFIX_DS_OVERRIDE:
141 theseg = &(core->segments.ds);
143 case PREFIX_ES_OVERRIDE:
144 theseg = &(core->segments.es);
146 case PREFIX_FS_OVERRIDE:
147 theseg = &(core->segments.fs);
149 case PREFIX_GS_OVERRIDE:
150 theseg = &(core->segments.gs);
159 PrintDebug("INS on port %d (0x%x)\n", io_info->port, io_info->port);
163 } else if (io_info->sz16) {
165 } else if (io_info->sz32) {
168 PrintError("io_info Invalid Size\n");
173 if (io_info->addr16) {
175 } else if (io_info->addr32) {
177 } else if (io_info->addr64) {
178 mask = 0xffffffffffffffffLL;
180 // This value should be set depending on the host register size...
181 mask = get_gpr_mask(core);
183 PrintDebug("INS io_info invalid address size, mask=0x%p, io_info=0x%p\n",
184 (void *)(addr_t)mask, (void *)(addr_t)(io_info));
185 // PrintDebug("INS Aborted... Check implementation\n");
190 rep_num = core->vm_regs.rcx & mask;
191 //rep_num = info->vm_regs.rcx;
194 PrintDebug("INS size=%d for %d steps\n", read_size, rep_num);
196 while (rep_num > 0) {
198 dst_addr = get_addr_linear(core, (core->vm_regs.rdi & mask), theseg);
200 // PrintDebug("Writing 0x%p\n", (void *)dst_addr);
202 if (v3_gva_to_hva(core, dst_addr, &host_addr) == -1) {
203 // either page fault or gpf...
204 PrintError("Could not convert Guest VA to host VA\n");
209 PrintDebug("INS operation on unhooked IO port 0x%x - returning zeros\n", io_info->port);
210 memset((char*)host_addr,0,read_size);
213 if (hook->read(core, io_info->port, (char *)host_addr, read_size, hook->priv_data) != read_size) {
214 // not sure how we handle errors.....
215 PrintError("Read Failure for ins on port 0x%x\n", io_info->port);
220 core->vm_regs.rdi += (read_size * direction);
232 int v3_handle_svm_io_out(struct guest_info * core, struct svm_io_info * io_info) {
233 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
238 } else if (io_info->sz16) {
240 } else if (io_info->sz32) {
244 PrintDebug("OUT of %d bytes on port %d (0x%x)\n", write_size, io_info->port, io_info->port);
247 PrintDebug("OUT operation on unhooked IO port 0x%x - ignored\n", io_info->port);
249 if (hook->write(core, io_info->port, &(core->vm_regs.rax), write_size, hook->priv_data) != write_size) {
250 // not sure how we handle errors.....
251 PrintError("Write Failure for out on port 0x%x\n", io_info->port);
261 /* We might not handle wrap around of the RSI register correctly...
262 * In that if we do wrap around the effect will manifest in the higher bits of the register
265 int v3_handle_svm_io_outs(struct guest_info * core, struct svm_io_info * io_info) {
267 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
273 struct v3_segment * theseg = &(core->segments.ds); // default is DS
275 // This is kind of hacky...
276 // direction can equal either 1 or -1
277 // We will multiply the final added offset by this value to go the correct direction
279 struct rflags * flags = (struct rflags *)&(core->ctrl_regs.rflags);
285 PrintDebug("OUTS on port %d (0x%x)\n", io_info->port, io_info->port);
289 } else if (io_info->sz16) {
291 } else if (io_info->sz32) {
296 if (io_info->addr16) {
298 } else if (io_info->addr32) {
300 } else if (io_info->addr64) {
301 mask = 0xffffffffffffffffLL;
303 // This value should be set depending on the host register size...
304 mask = get_gpr_mask(core);
306 PrintDebug("OUTS io_info invalid address size, mask=0%p, io_info=0x%p\n",
307 (void *)(addr_t)mask, (void *)(addr_t)io_info);
308 // PrintDebug("INS Aborted... Check implementation\n");
310 // should never happen
311 //PrintDebug("Invalid Address length\n");
316 rep_num = core->vm_regs.rcx & mask;
322 if (v3_gva_to_hva(core, get_addr_linear(core, core->rip, &(core->segments.cs)), &inst_ptr) == -1) {
323 PrintError("Can't access instruction\n");
327 while (is_prefix_byte(*((char *)inst_ptr))) {
328 switch (*((char *)inst_ptr)) {
329 case PREFIX_CS_OVERRIDE:
330 theseg = &(core->segments.cs);
332 case PREFIX_SS_OVERRIDE:
333 theseg = &(core->segments.ss);
335 case PREFIX_DS_OVERRIDE:
336 theseg = &(core->segments.ds);
338 case PREFIX_ES_OVERRIDE:
339 theseg = &(core->segments.es);
341 case PREFIX_FS_OVERRIDE:
342 theseg = &(core->segments.fs);
344 case PREFIX_GS_OVERRIDE:
345 theseg = &(core->segments.gs);
353 PrintDebug("OUTS size=%d for %d steps\n", write_size, rep_num);
355 while (rep_num > 0) {
356 addr_t host_addr = 0;
358 dst_addr = get_addr_linear(core, (core->vm_regs.rsi & mask), theseg);
360 if (v3_gva_to_hva(core, dst_addr, &host_addr) == -1) {
361 PrintError("Could not translate outs dest addr, either page fault or gpf...\n");
366 PrintDebug("OUTS operation on unhooked IO port 0x%x - ignored\n", io_info->port);
368 if (hook->write(core, io_info->port, (char*)host_addr, write_size, hook->priv_data) != write_size) {
369 // not sure how we handle errors.....
370 PrintError("Write Failure for outs on port 0x%x\n", io_info->port);
376 core->vm_regs.rsi += write_size * direction;