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 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, 0, PAGE_SIZE_4KB * 3);
55 v3_refresh_io_map(vm);
62 // This should package up an IO request and call vmm_handle_io
63 int v3_handle_svm_io_in(struct guest_info * core, struct svm_io_info * io_info) {
64 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
68 PrintError("Hook Not present for in on port 0x%x\n", io_info->port);
69 // error, we should not have exited on this port
76 } else if (io_info->sz16) {
78 } else if (io_info->sz32) {
82 PrintDebug("IN of %d bytes on port %d (0x%x)\n", read_size, io_info->port, io_info->port);
84 if (hook->read(core, io_info->port, &(core->vm_regs.rax), read_size, hook->priv_data) != read_size) {
85 // not sure how we handle errors.....
86 PrintError("Read Failure for in on port 0x%x\n", io_info->port);
97 /* We might not handle wrap around of the RDI register correctly...
98 * In that if we do wrap around the effect will manifest in the higher bits of the register
100 int v3_handle_svm_io_ins(struct guest_info * core, struct svm_io_info * io_info) {
101 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
106 struct v3_segment * theseg = &(core->segments.es); // default is ES
110 // This is kind of hacky...
111 // direction can equal either 1 or -1
112 // We will multiply the final added offset by this value to go the correct direction
114 struct rflags * flags = (struct rflags *)&(core->ctrl_regs.rflags);
122 PrintError("Hook Not present for ins on port 0x%x\n", io_info->port);
123 // error, we should not have exited on this port
129 if (v3_gva_to_hva(core, get_addr_linear(core, core->rip, &(core->segments.cs)), &inst_ptr) == -1) {
130 PrintError("Can't access instruction\n");
134 while (is_prefix_byte(*((char *)inst_ptr))) {
135 switch (*((char *)inst_ptr)) {
136 case PREFIX_CS_OVERRIDE:
137 theseg = &(core->segments.cs);
139 case PREFIX_SS_OVERRIDE:
140 theseg = &(core->segments.ss);
142 case PREFIX_DS_OVERRIDE:
143 theseg = &(core->segments.ds);
145 case PREFIX_ES_OVERRIDE:
146 theseg = &(core->segments.es);
148 case PREFIX_FS_OVERRIDE:
149 theseg = &(core->segments.fs);
151 case PREFIX_GS_OVERRIDE:
152 theseg = &(core->segments.gs);
161 PrintDebug("INS on port %d (0x%x)\n", io_info->port, io_info->port);
165 } else if (io_info->sz16) {
167 } else if (io_info->sz32) {
170 PrintError("io_info Invalid Size\n");
175 if (io_info->addr16) {
177 } else if (io_info->addr32) {
179 } else if (io_info->addr64) {
180 mask = 0xffffffffffffffffLL;
182 // This value should be set depending on the host register size...
183 mask = get_gpr_mask(core);
185 PrintDebug("INS io_info invalid address size, mask=0x%p, io_info=0x%p\n",
186 (void *)(addr_t)mask, (void *)(addr_t)(io_info));
187 // PrintDebug("INS Aborted... Check implementation\n");
192 rep_num = core->vm_regs.rcx & mask;
193 //rep_num = info->vm_regs.rcx;
197 PrintDebug("INS size=%d for %d steps\n", read_size, rep_num);
199 while (rep_num > 0) {
201 dst_addr = get_addr_linear(core, (core->vm_regs.rdi & mask), theseg);
203 // PrintDebug("Writing 0x%p\n", (void *)dst_addr);
205 if (v3_gva_to_hva(core, dst_addr, &host_addr) == -1) {
206 // either page fault or gpf...
207 PrintError("Could not convert Guest VA to host VA\n");
211 if (hook->read(core, io_info->port, (char *)host_addr, read_size, hook->priv_data) != read_size) {
212 // not sure how we handle errors.....
213 PrintError("Read Failure for ins on port 0x%x\n", io_info->port);
217 core->vm_regs.rdi += (read_size * direction);
229 int v3_handle_svm_io_out(struct guest_info * core, struct svm_io_info * io_info) {
230 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
234 PrintError("Hook Not present for out on port 0x%x\n", io_info->port);
235 // error, we should not have exited on this port
242 } else if (io_info->sz16) {
244 } else if (io_info->sz32) {
248 PrintDebug("OUT of %d bytes on port %d (0x%x)\n", write_size, io_info->port, io_info->port);
250 if (hook->write(core, io_info->port, &(core->vm_regs.rax), write_size, hook->priv_data) != write_size) {
251 // not sure how we handle errors.....
252 PrintError("Write Failure for out on port 0x%x\n", io_info->port);
260 /* We might not handle wrap around of the RSI register correctly...
261 * In that if we do wrap around the effect will manifest in the higher bits of the register
264 int v3_handle_svm_io_outs(struct guest_info * core, struct svm_io_info * io_info) {
266 struct v3_io_hook * hook = v3_get_io_hook(core->vm_info, io_info->port);
272 struct v3_segment * theseg = &(core->segments.ds); // default is DS
274 // This is kind of hacky...
275 // direction can equal either 1 or -1
276 // We will multiply the final added offset by this value to go the correct direction
278 struct rflags * flags = (struct rflags *)&(core->ctrl_regs.rflags);
286 PrintError("Hook Not present for outs on port 0x%x\n", io_info->port);
287 // error, we should not have exited on this port
291 PrintDebug("OUTS on port %d (0x%x)\n", io_info->port, io_info->port);
295 } else if (io_info->sz16) {
297 } else if (io_info->sz32) {
302 if (io_info->addr16) {
304 } else if (io_info->addr32) {
306 } else if (io_info->addr64) {
307 mask = 0xffffffffffffffffLL;
309 // This value should be set depending on the host register size...
310 mask = get_gpr_mask(core);
312 PrintDebug("OUTS io_info invalid address size, mask=0%p, io_info=0x%p\n",
313 (void *)(addr_t)mask, (void *)(addr_t)io_info);
314 // PrintDebug("INS Aborted... Check implementation\n");
316 // should never happen
317 //PrintDebug("Invalid Address length\n");
322 rep_num = core->vm_regs.rcx & mask;
328 if (v3_gva_to_hva(core, get_addr_linear(core, core->rip, &(core->segments.cs)), &inst_ptr) == -1) {
329 PrintError("Can't access instruction\n");
333 while (is_prefix_byte(*((char *)inst_ptr))) {
334 switch (*((char *)inst_ptr)) {
335 case PREFIX_CS_OVERRIDE:
336 theseg = &(core->segments.cs);
338 case PREFIX_SS_OVERRIDE:
339 theseg = &(core->segments.ss);
341 case PREFIX_DS_OVERRIDE:
342 theseg = &(core->segments.ds);
344 case PREFIX_ES_OVERRIDE:
345 theseg = &(core->segments.es);
347 case PREFIX_FS_OVERRIDE:
348 theseg = &(core->segments.fs);
350 case PREFIX_GS_OVERRIDE:
351 theseg = &(core->segments.gs);
359 PrintDebug("OUTS size=%d for %d steps\n", write_size, rep_num);
361 while (rep_num > 0) {
362 addr_t host_addr = 0;
364 dst_addr = get_addr_linear(core, (core->vm_regs.rsi & mask), theseg);
366 if (v3_gva_to_hva(core, dst_addr, &host_addr) == -1) {
367 PrintError("Could not translate outs dest addr, either page fault or gpf...\n");
371 if (hook->write(core, io_info->port, (char*)host_addr, write_size, hook->priv_data) != write_size) {
372 // not sure how we handle errors.....
373 PrintError("Write Failure for outs on port 0x%x\n", io_info->port);
377 core->vm_regs.rsi += write_size * direction;