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".
20 #include <palacios/svm_io.h>
21 #include <palacios/vmm_io.h>
22 #include <palacios/vmm_ctrl_regs.h>
23 #include <palacios/vmm_decoder.h>
24 #include <palacios/vm_guest_mem.h>
26 #ifndef CONFIG_DEBUG_IO
28 #define PrintDebug(fmt, args...)
32 static int update_map(struct guest_info * info, uint16_t port, int hook_read, int hook_write) {
33 uchar_t * bitmap = (uint8_t *)(info->io_map.arch_data);;
37 if ((hook_read == 0) && (hook_write == 0)) {
38 *(bitmap + major) &= ~(0x1 << minor);
40 *(bitmap + major) |= (0x1 << minor);
47 int v3_init_svm_io_map(struct guest_info * info) {
48 info->io_map.update_map = update_map;
50 info->io_map.arch_data = V3_VAddr(V3_AllocPages(3));
51 memset(info->io_map.arch_data, 0, PAGE_SIZE_4KB * 3);
54 v3_refresh_io_map(info);
61 // This should package up an IO request and call vmm_handle_io
62 int v3_handle_svm_io_in(struct guest_info * info, struct svm_io_info * io_info) {
63 struct v3_io_hook * hook = v3_get_io_hook(info, io_info->port);
67 PrintError("Hook Not present for in on port 0x%x\n", io_info->port);
68 // error, we should not have exited on this port
75 } else if (io_info->sz16) {
77 } else if (io_info->sz32) {
81 PrintDebug("IN of %d bytes on port %d (0x%x)\n", read_size, io_info->port, io_info->port);
83 if (hook->read(io_info->port, &(info->vm_regs.rax), read_size, hook->priv_data) != read_size) {
84 // not sure how we handle errors.....
85 PrintError("Read Failure for in on port 0x%x\n", io_info->port);
96 /* We might not handle wrap around of the RDI register correctly...
97 * In that if we do wrap around the effect will manifest in the higher bits of the register
99 int v3_handle_svm_io_ins(struct guest_info * info, struct svm_io_info * io_info) {
100 struct v3_io_hook * hook = v3_get_io_hook(info, io_info->port);
105 struct v3_segment * theseg = &(info->segments.es); // default is ES
109 // This is kind of hacky...
110 // direction can equal either 1 or -1
111 // We will multiply the final added offset by this value to go the correct direction
113 struct rflags * flags = (struct rflags *)&(info->ctrl_regs.rflags);
121 PrintError("Hook Not present for ins on port 0x%x\n", io_info->port);
122 // error, we should not have exited on this port
128 if (guest_va_to_host_va(info, get_addr_linear(info, info->rip, &(info->segments.cs)), &inst_ptr) == -1) {
129 PrintError("Can't access instruction\n");
133 while (is_prefix_byte(*((char *)inst_ptr))) {
134 switch (*((char *)inst_ptr)) {
135 case PREFIX_CS_OVERRIDE:
136 theseg = &(info->segments.cs);
138 case PREFIX_SS_OVERRIDE:
139 theseg = &(info->segments.ss);
141 case PREFIX_DS_OVERRIDE:
142 theseg = &(info->segments.ds);
144 case PREFIX_ES_OVERRIDE:
145 theseg = &(info->segments.es);
147 case PREFIX_FS_OVERRIDE:
148 theseg = &(info->segments.fs);
150 case PREFIX_GS_OVERRIDE:
151 theseg = &(info->segments.gs);
160 PrintDebug("INS on port %d (0x%x)\n", io_info->port, io_info->port);
164 } else if (io_info->sz16) {
166 } else if (io_info->sz32) {
169 PrintError("io_info Invalid Size\n");
174 if (io_info->addr16) {
176 } else if (io_info->addr32) {
178 } else if (io_info->addr64) {
179 mask = 0xffffffffffffffffLL;
181 // This value should be set depending on the host register size...
182 mask = get_gpr_mask(info);
184 PrintDebug("INS io_info invalid address size, mask=0x%p, io_info=0x%p\n",
185 (void *)(addr_t)mask, (void *)(addr_t)(io_info));
186 // PrintDebug("INS Aborted... Check implementation\n");
191 rep_num = info->vm_regs.rcx & mask;
192 //rep_num = info->vm_regs.rcx;
196 PrintDebug("INS size=%d for %d steps\n", read_size, rep_num);
198 while (rep_num > 0) {
200 dst_addr = get_addr_linear(info, (info->vm_regs.rdi & mask), theseg);
202 // PrintDebug("Writing 0x%p\n", (void *)dst_addr);
204 if (guest_va_to_host_va(info, dst_addr, &host_addr) == -1) {
205 // either page fault or gpf...
206 PrintError("Could not convert Guest VA to host VA\n");
210 if (hook->read(io_info->port, (char *)host_addr, read_size, hook->priv_data) != read_size) {
211 // not sure how we handle errors.....
212 PrintError("Read Failure for ins on port 0x%x\n", io_info->port);
216 info->vm_regs.rdi += (read_size * direction);
228 int v3_handle_svm_io_out(struct guest_info * info, struct svm_io_info * io_info) {
229 struct v3_io_hook * hook = v3_get_io_hook(info, io_info->port);
233 PrintError("Hook Not present for out on port 0x%x\n", io_info->port);
234 // error, we should not have exited on this port
241 } else if (io_info->sz16) {
243 } else if (io_info->sz32) {
247 PrintDebug("OUT of %d bytes on port %d (0x%x)\n", write_size, io_info->port, io_info->port);
249 if (hook->write(io_info->port, &(info->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);
259 /* We might not handle wrap around of the RSI register correctly...
260 * In that if we do wrap around the effect will manifest in the higher bits of the register
263 int v3_handle_svm_io_outs(struct guest_info * info, struct svm_io_info * io_info) {
265 struct v3_io_hook * hook = v3_get_io_hook(info, io_info->port);
271 struct v3_segment * theseg = &(info->segments.es); // default is ES
273 // This is kind of hacky...
274 // direction can equal either 1 or -1
275 // We will multiply the final added offset by this value to go the correct direction
277 struct rflags * flags = (struct rflags *)&(info->ctrl_regs.rflags);
285 PrintError("Hook Not present for outs on port 0x%x\n", io_info->port);
286 // error, we should not have exited on this port
290 PrintDebug("OUTS on port %d (0x%x)\n", io_info->port, io_info->port);
294 } else if (io_info->sz16) {
296 } else if (io_info->sz32) {
301 if (io_info->addr16) {
303 } else if (io_info->addr32) {
305 } else if (io_info->addr64) {
306 mask = 0xffffffffffffffffLL;
308 // This value should be set depending on the host register size...
309 mask = get_gpr_mask(info);
311 PrintDebug("OUTS io_info invalid address size, mask=0%p, io_info=0x%p\n",
312 (void *)(addr_t)mask, (void *)(addr_t)io_info);
313 // PrintDebug("INS Aborted... Check implementation\n");
315 // should never happen
316 //PrintDebug("Invalid Address length\n");
321 rep_num = info->vm_regs.rcx & mask;
327 if (guest_va_to_host_va(info, get_addr_linear(info, info->rip, &(info->segments.cs)), &inst_ptr) == -1) {
328 PrintError("Can't access instruction\n");
332 while (is_prefix_byte(*((char *)inst_ptr))) {
333 switch (*((char *)inst_ptr)) {
334 case PREFIX_CS_OVERRIDE:
335 theseg = &(info->segments.cs);
337 case PREFIX_SS_OVERRIDE:
338 theseg = &(info->segments.ss);
340 case PREFIX_DS_OVERRIDE:
341 theseg = &(info->segments.ds);
343 case PREFIX_ES_OVERRIDE:
344 theseg = &(info->segments.es);
346 case PREFIX_FS_OVERRIDE:
347 theseg = &(info->segments.fs);
349 case PREFIX_GS_OVERRIDE:
350 theseg = &(info->segments.gs);
358 PrintDebug("OUTS size=%d for %d steps\n", write_size, rep_num);
360 while (rep_num > 0) {
363 dst_addr = get_addr_linear(info, (info->vm_regs.rsi & mask), theseg);
365 if (guest_va_to_host_va(info, dst_addr, &host_addr) == -1) {
366 // either page fault or gpf...
369 if (hook->write(io_info->port, (char*)host_addr, write_size, hook->priv_data) != write_size) {
370 // not sure how we handle errors.....
371 PrintError("Write Failure for outs on port 0x%x\n", io_info->port);
375 info->vm_regs.rsi += write_size * direction;