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kvmdump.c
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kvmdump.c
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/*
* kvmdump.c
*
* Copyright (C) 2009, 2010, 2011 David Anderson
* Copyright (C) 2009, 2010, 2011 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#include "kvmdump.h"
static struct kvmdump_data kvmdump_data = { 0 };
struct kvmdump_data *kvm = &kvmdump_data;
static int cache_page(physaddr_t);
static int kvmdump_mapfile_exists(void);
static off_t mapfile_offset(uint64_t);
static void kvmdump_mapfile_create(char *);
static void kvmdump_mapfile_append(void);
static char *mapfile_in_use(void);
static void write_mapfile_registers(void);
static void write_mapfile_trailer(void);
static void read_mapfile_trailer(void);
static void read_mapfile_registers(void);
#define RAM_OFFSET_COMPRESSED (~(off_t)255)
#define QEMU_COMPRESSED ((WRITE_ERROR)-1)
#define CACHE_UNUSED (1ULL)
int
is_kvmdump(char *filename)
{
int i;
ulong *ptr;
off_t eof;
ulonglong csum;
struct mapinfo_trailer trailer;
char buf[CHKSUM_SIZE];
if (!is_qemu_vm_file(filename))
return FALSE;
if (lseek(kvm->vmfd, 0, SEEK_SET) < 0) {
error(INFO, "%s: read: %s\n", filename, strerror(errno));
return FALSE;
}
if (read(kvm->vmfd, buf, CHKSUM_SIZE) != CHKSUM_SIZE) {
error(INFO, "%s: read: %s\n", filename, strerror(errno));
return FALSE;
}
ptr = (ulong *)&buf[0];
for (i = csum = 0; i < (CHKSUM_SIZE/sizeof(ulong)); i++, ptr++)
csum += *ptr;
eof = lseek(kvm->vmfd, 0, SEEK_END);
if (lseek(kvm->vmfd, eof - sizeof(trailer), SEEK_SET) < 0) {
error(INFO, "%s: lseek: %s\n", filename, strerror(errno));
return FALSE;
}
if (read(kvm->vmfd, &trailer, sizeof(trailer)) != sizeof(trailer)) {
error(INFO, "%s: read: %s\n", filename, strerror(errno));
return FALSE;
}
if (trailer.magic == MAPFILE_MAGIC) {
kvm->mapinfo.map_start_offset = trailer.map_start_offset;
kvm->flags |= MAPFILE_APPENDED;
}
kvm->mapinfo.checksum = csum;
return TRUE;
}
int
kvmdump_init(char *filename, FILE *fptr)
{
int i, page_size;
struct command_table_entry *cp;
char *cachebuf;
FILE *tmpfp;
if (!machine_type("X86") && !machine_type("X86_64")) {
error(FATAL,
"invalid or unsupported host architecture for KVM: %s\n",
MACHINE_TYPE);
return FALSE;
}
kvm->ofp = fptr;
kvm->debug = &pc->debug;
page_size = memory_page_size();
#ifdef X86_64
kvm->kvbase = __START_KERNEL_map;
#endif
switch (kvm->flags & (TMPFILE|MAPFILE|MAPFILE_APPENDED))
{
case MAPFILE_APPENDED:
kvm->mapfd = kvm->vmfd;
break;
case MAPFILE|MAPFILE_APPENDED:
case MAPFILE:
break;
default:
if (kvmdump_mapfile_exists())
break;
if ((tmpfp = tmpfile()) == NULL)
error(FATAL,
"cannot create tmpfile for KVM file offsets: %s\n",
strerror(errno));
kvm->mapfd = fileno(tmpfp);
kvm->flags |= TMPFILE;
break;
}
if ((cachebuf = calloc(1, KVMDUMP_CACHED_PAGES * page_size)) == NULL)
error(FATAL, "%s: cannot malloc KVM page_cache_buf\n");
for (i = 0; i < KVMDUMP_CACHED_PAGES; i++) {
kvm->page_cache[i].paddr = CACHE_UNUSED;
kvm->page_cache[i].bufptr = cachebuf + (i * page_size);
}
kvmdump_regs_store(KVMDUMP_REGS_START, NULL);
if (qemu_init(filename)) {
switch (kvm->flags & (TMPFILE|MAPFILE|MAPFILE_APPENDED))
{
case TMPFILE:
kvmdump_regs_store(KVMDUMP_REGS_END, NULL);
write_mapfile_trailer();
break;
case MAPFILE:
case MAPFILE_APPENDED:
case MAPFILE|MAPFILE_APPENDED:
read_mapfile_trailer();
kvmdump_regs_store(KVMDUMP_REGS_END, NULL);
break;
}
for (cp = pc->cmd_table; cp->name; cp++) {
if (STREQ(cp->name, "map")) {
cp->flags &= ~HIDDEN_COMMAND;
break;
}
}
kvm->flags |= KVMDUMP_LOCAL;
return TRUE;
} else
return FALSE;
}
int
read_kvmdump(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
switch (cache_page(PHYSPAGEBASE(paddr)))
{
case READ_ERROR:
return READ_ERROR;
case SEEK_ERROR:
return SEEK_ERROR;
case QEMU_COMPRESSED:
memset(bufptr, kvm->un.compressed, cnt);
break;
default:
memcpy(bufptr, kvm->un.curbufptr + PAGEOFFSET(paddr), cnt);
break;
}
return cnt;
}
int
write_kvmdump(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
return SEEK_ERROR;
}
/*
* kvmdump_free_memory(), and kvmdump_memory_used()
* are debug only, and typically unnecessary to implement.
*/
int
kvmdump_free_memory(void)
{
return 0;
}
int
kvmdump_memory_used(void)
{
return 0;
}
/*
* This function is dump-type independent, used here to
* to dump the kvmdump_data structure contents.
*/
int
kvmdump_memory_dump(FILE *ofp)
{
int i, others;
struct mapinfo_trailer trailer;
off_t eof;
fprintf(ofp, " flags: %lx (", kvm->flags);
others = 0;
if (kvm->flags & KVMDUMP_LOCAL)
fprintf(ofp, "%sKVMDUMP_LOCAL", others++ ? "|" : "");
if (kvm->flags & TMPFILE)
fprintf(ofp, "%sTMPFILE", others++ ? "|" : "");
if (kvm->flags & MAPFILE)
fprintf(ofp, "%sMAPFILE", others++ ? "|" : "");
if (kvm->flags & MAPFILE_FOUND)
fprintf(ofp, "%sMAPFILE_FOUND", others++ ? "|" : "");
if (kvm->flags & MAPFILE_APPENDED)
fprintf(ofp, "%sMAPFILE_APPENDED", others++ ? "|" : "");
if (kvm->flags & NO_PHYS_BASE)
fprintf(ofp, "%sNO_PHYS_BASE", others++ ? "|" : "");
if (kvm->flags & KVMHOST_32)
fprintf(ofp, "%sKVMHOST_32", others++ ? "|" : "");
if (kvm->flags & KVMHOST_64)
fprintf(ofp, "%sKVMHOST_64", others++ ? "|" : "");
if (kvm->flags & REGS_FROM_MAPFILE)
fprintf(ofp, "%sREGS_FROM_MAPFILE", others++ ? "|" : "");
if (kvm->flags & REGS_FROM_DUMPFILE)
fprintf(ofp, "%sREGS_FROM_DUMPFILE", others++ ? "|" : "");
if (kvm->flags & REGS_NOT_AVAIL)
fprintf(ofp, "%sREGS_NOT_AVAIL", others++ ? "|" : "");
fprintf(ofp, ")\n");
fprintf(ofp, " mapfd: %d\n", kvm->mapfd);
fprintf(ofp, " vmfd: %d\n", kvm->vmfd);
fprintf(ofp, " vmp: %lx (fd: %d)\n", (ulong)kvm->vmp,
fileno(kvm->vmp));
fprintf(ofp, " ofp: %lx\n", (ulong)kvm->ofp);
fprintf(ofp, " debug: %lx\n", (ulong)kvm->debug);
if (machine_type("X86_64"))
fprintf(ofp, " kvbase: %llx\n", (ulonglong)kvm->kvbase);
else
fprintf(ofp, " kvbase: (unused)\n");
fprintf(ofp, " mapinfo:\n");
fprintf(ofp, " magic: %llx %s\n", (ulonglong)kvm->mapinfo.magic,
kvm->mapinfo.magic == MAPFILE_MAGIC ? "(MAPFILE_MAGIC)" : "");
fprintf(ofp, " phys_base: %llx %s\n", (ulonglong)kvm->mapinfo.phys_base,
machine_type("X86") ? "(unused)" : "");
fprintf(ofp, " cpu_version_id: %ld\n", (ulong)kvm->mapinfo.cpu_version_id);
fprintf(ofp, " ram_version_id: %ld\n", (ulong)kvm->mapinfo.ram_version_id);
fprintf(ofp, " map_start_offset: %llx\n", (ulonglong)kvm->mapinfo.map_start_offset);
fprintf(ofp, " checksum: %llx\n", (ulonglong)kvm->mapinfo.checksum);
fprintf(ofp, " curbufptr: %lx\n", (ulong)kvm->un.curbufptr);
fprintf(ofp, " evict_index: %d\n", kvm->evict_index);
fprintf(ofp, " accesses: %ld\n", kvm->accesses);
fprintf(ofp, " hit_count: %ld ", kvm->hit_count);
if (kvm->accesses)
fprintf(ofp, "(%ld%%)\n",
kvm->hit_count * 100 / kvm->accesses);
else
fprintf(ofp, "\n");
fprintf(ofp, " compresses: %ld ", kvm->compresses);
if (kvm->accesses)
fprintf(ofp, "(%ld%%)\n",
kvm->compresses * 100 / kvm->accesses);
else
fprintf(ofp, "\n");
for (i = 0; i < KVMDUMP_CACHED_PAGES; i++) {
if (kvm->page_cache[i].paddr == CACHE_UNUSED)
fprintf(ofp, " %spage_cache[%d]: CACHE_UNUSED\n",
i < 10 ? " " : "", i);
else
fprintf(ofp,
" %spage_cache[%d]: bufptr: %lx addr: %llx\n",
i < 10 ? " " : "", i,
(ulong)kvm->page_cache[i].bufptr,
(ulonglong)kvm->page_cache[i].paddr);
}
fprintf(ofp, " cpu_devices: %ld\n", kvm->cpu_devices);
fprintf(ofp, " iohole: %llx (%llx - %llx)\n",
(ulonglong)kvm->iohole, 0x100000000ULL - kvm->iohole,
0x100000000ULL);
fprintf(ofp, " registers: %s\n",
kvm->registers ? "" : "(not used)");
for (i = 0; i < kvm->cpu_devices; i++) {
fprintf(ofp, " CPU %d:\n", i);
kvmdump_display_regs(i, ofp);
}
fprintf(ofp, "\n");
dump_qemu_header(ofp);
fprintf(ofp, "\n%s: mapinfo trailer:\n\n", mapfile_in_use());
eof = lseek(kvm->mapfd, 0, SEEK_END);
if (lseek(kvm->mapfd, eof - sizeof(trailer), SEEK_SET) < 0)
error(FATAL, "%s: lseek: %s\n", mapfile_in_use(),
strerror(errno));
if (read(kvm->mapfd, &trailer, sizeof(trailer)) != sizeof(trailer))
error(FATAL, "%s: read: %s\n", mapfile_in_use(),
strerror(errno));
fprintf(ofp, " magic: %llx %s\n", (ulonglong)trailer.magic,
trailer.magic == MAPFILE_MAGIC ? "(MAPFILE_MAGIC)" : "");
fprintf(ofp, " phys_base: %llx %s\n", (ulonglong)trailer.phys_base,
machine_type("X86") ? "(unused)" : "");
fprintf(ofp, " cpu_version_id: %ld\n", (ulong)trailer.cpu_version_id);
fprintf(ofp, " ram_version_id: %ld\n", (ulong)trailer.ram_version_id);
fprintf(ofp, " map_start_offset: %llx\n", (ulonglong)trailer.map_start_offset);
fprintf(ofp, " checksum: %llx\n\n", (ulonglong)trailer.checksum);
return TRUE;
}
void
kvmdump_display_regs(int cpu, FILE *ofp)
{
struct register_set *rp;
if (cpu >= kvm->cpu_devices) {
error(INFO, "registers not collected for cpu %d\n", cpu);
return;
}
rp = &kvm->registers[cpu];
if (machine_type("X86_64")) {
fprintf(ofp,
" RIP: %016llx RSP: %016llx RFLAGS: %08llx\n"
" RAX: %016llx RBX: %016llx RCX: %016llx\n"
" RDX: %016llx RSI: %016llx RDI: %016llx\n"
" RBP: %016llx R8: %016llx R9: %016llx\n"
" R10: %016llx R11: %016llx R12: %016llx\n"
" R13: %016llx R14: %016llx R15: %016llx\n"
" CS: %04x SS: %04x\n",
(ulonglong)rp->ip,
(ulonglong)rp->regs[R_ESP],
(ulonglong)rp->flags,
(ulonglong)rp->regs[R_EAX],
(ulonglong)rp->regs[R_EBX],
(ulonglong)rp->regs[R_ECX],
(ulonglong)rp->regs[R_EDX],
(ulonglong)rp->regs[R_ESI],
(ulonglong)rp->regs[R_EDI],
(ulonglong)rp->regs[R_EBP],
(ulonglong)rp->regs[8],
(ulonglong)rp->regs[9],
(ulonglong)rp->regs[10],
(ulonglong)rp->regs[11],
(ulonglong)rp->regs[12],
(ulonglong)rp->regs[13],
(ulonglong)rp->regs[14],
(ulonglong)rp->regs[15],
rp->cs,
rp->ss);
}
if (machine_type("X86")) {
fprintf(ofp,
" EAX: %08llx EBX: %08llx ECX: %08llx EDX: %08llx\n"
" DS: %04x ESI: %08llx ES: %04x EDI: %08llx\n"
" SS: %04x ESP: %08llx EBP: %08llx GS: %04x\n"
" CS: %04x EIP: %08llx EFLAGS: %08llx\n",
(ulonglong)rp->regs[R_EAX],
(ulonglong)rp->regs[R_EBX],
(ulonglong)rp->regs[R_ECX],
(ulonglong)rp->regs[R_EDX],
rp->ds,
(ulonglong)rp->regs[R_ESI],
rp->ds,
(ulonglong)rp->regs[R_EDI],
rp->ss,
(ulonglong)rp->regs[R_ESP],
(ulonglong)rp->regs[R_EBP],
rp->gs,
rp->cs,
(ulonglong)rp->ip,
(ulonglong)rp->flags);
}
}
void
get_kvmdump_regs(struct bt_info *bt, ulong *ipp, ulong *spp)
{
ulong ip, sp;
struct register_set *rp;
ip = sp = 0;
if (!is_task_active(bt->task)) {
machdep->get_stack_frame(bt, ipp, spp);
return;
}
bt->flags |= BT_DUMPFILE_SEARCH;
if (machine_type("X86_64"))
machdep->get_stack_frame(bt, ipp, spp);
else if (machine_type("X86"))
get_netdump_regs_x86(bt, ipp, spp);
if (bt->flags & BT_DUMPFILE_SEARCH)
return;
if ((kvm->registers == NULL) ||
(bt->tc->processor >= kvm->cpu_devices))
return;
rp = &kvm->registers[bt->tc->processor];
ip = (ulong)rp->ip;
sp = (ulong)rp->regs[R_ESP];
if (is_kernel_text(ip) &&
(((sp >= GET_STACKBASE(bt->task)) &&
(sp < GET_STACKTOP(bt->task))) ||
in_alternate_stack(bt->tc->processor, sp))) {
*ipp = ip;
*spp = sp;
bt->flags |= BT_KERNEL_SPACE;
return;
}
if (!is_kernel_text(ip) &&
in_user_stack(bt->tc->task, sp))
bt->flags |= BT_USER_SPACE;
}
ulong
get_kvmdump_panic_task(void)
{
int i;
struct bt_info *bt;
ulong panic_task, task, rip, rsp;
char *sym;
if (machine_type("X86") || !get_active_set())
return NO_TASK;
bt = (struct bt_info *)GETBUF(sizeof(struct bt_info));
for (i = 0, panic_task = NO_TASK; i < NR_CPUS; i++) {
if (!(task = tt->active_set[i]) ||
!(bt->tc = task_to_context(task)))
continue;
bt->task = task;
bt->stackbase = GET_STACKBASE(task);
bt->stacktop = GET_STACKTOP(task);
if (!bt->stackbuf)
bt->stackbuf = GETBUF(bt->stacktop - bt->stackbase);
alter_stackbuf(bt);
bt->flags |= BT_DUMPFILE_SEARCH;
machdep->get_stack_frame(bt, &rip, &rsp);
if (!(bt->flags & BT_DUMPFILE_SEARCH))
continue;
sym = closest_symbol(rip);
if (STREQ(sym, "panic") ||
STREQ(sym, "die") ||
STREQ(sym, "die_nmi") ||
STREQ(sym, "sysrq_handle_crash")) {
if (CRASHDEBUG(1))
fprintf(fp, "get_kvmdump_panic_task: %lx\n",
task);
panic_task = task;
break;
}
}
if (bt->stackbuf)
FREEBUF(bt->stackbuf);
FREEBUF(bt);
return panic_task;
}
int
kvmdump_phys_base(unsigned long *phys_base)
{
if (KVMDUMP_VALID()) {
if (CRASHDEBUG(1) && (kvm->mapinfo.cpu_version_id > 9))
error(NOTE,
"KVM/QEMU CPU_SAVE_VERSION %d is greater than"
" supported version 9\n\n",
kvm->mapinfo.cpu_version_id);
*phys_base = kvm->mapinfo.phys_base;
return (kvm->flags & NO_PHYS_BASE ? FALSE : TRUE);
}
return FALSE;
}
static int
cache_page(physaddr_t paddr)
{
int idx, err;
struct kvm_page_cache_hdr *pgc;
size_t page_size;
off_t offset;
kvm->accesses++;
for (idx = 0; idx < KVMDUMP_CACHED_PAGES; idx++) {
pgc = &kvm->page_cache[idx];
if (pgc->paddr == CACHE_UNUSED)
continue;
if (pgc->paddr == paddr) {
kvm->hit_count++;
kvm->un.curbufptr = pgc->bufptr;
return idx;
}
}
if ((err = load_mapfile_offset(paddr, &offset)) < 0)
return err;
if ((offset & RAM_OFFSET_COMPRESSED) == RAM_OFFSET_COMPRESSED) {
kvm->un.compressed = (unsigned char)(offset & 255);
kvm->compresses++;
return QEMU_COMPRESSED;
}
idx = kvm->evict_index;
pgc = &kvm->page_cache[idx];
page_size = memory_page_size();
if (lseek(kvm->vmfd, offset, SEEK_SET) < 0) {
pgc->paddr = CACHE_UNUSED;
return SEEK_ERROR;
}
if (read(kvm->vmfd, pgc->bufptr, page_size) != page_size) {
pgc->paddr = CACHE_UNUSED;
return READ_ERROR;
}
kvm->evict_index = (idx+1) % KVMDUMP_CACHED_PAGES;
pgc->paddr = paddr;
kvm->un.curbufptr = pgc->bufptr;
return idx;
}
static off_t
mapfile_offset(uint64_t physaddr)
{
off_t offset = 0;
switch (kvm->flags & (TMPFILE|MAPFILE|MAPFILE_APPENDED))
{
case TMPFILE:
case TMPFILE|MAPFILE_APPENDED:
case MAPFILE:
case MAPFILE|MAPFILE_APPENDED:
offset = (off_t)(((((uint64_t)physaddr/(uint64_t)4096))
* sizeof(off_t)));
break;
case MAPFILE_APPENDED:
offset = (off_t)(((((uint64_t)physaddr/(uint64_t)4096))
* sizeof(off_t)) + kvm->mapinfo.map_start_offset);
break;
}
return offset;
}
int
store_mapfile_offset(uint64_t physaddr, off_t *entry_ptr)
{
if (lseek(kvm->mapfd, mapfile_offset(physaddr), SEEK_SET) < 0) {
error(INFO, "store_mapfile_offset: "
"lseek error: physaddr: %llx %s offset: %llx\n",
(unsigned long long)physaddr, mapfile_in_use(),
(unsigned long long)mapfile_offset(physaddr));
return SEEK_ERROR;
}
if (write(kvm->mapfd, entry_ptr, sizeof(off_t)) != sizeof(off_t)) {
error(INFO, "store_mapfile_offset: "
"write error: physaddr: %llx %s offset: %llx\n",
(unsigned long long)physaddr, mapfile_in_use(),
(unsigned long long)mapfile_offset(physaddr));
return WRITE_ERROR;
}
return 0;
}
int
load_mapfile_offset(uint64_t physaddr, off_t *entry_ptr)
{
uint64_t kvm_addr = physaddr;
switch (kvm->iohole)
{
case 0x20000000ULL:
if (physaddr >= 0xe0000000ULL) {
if (physaddr < 0x100000000ULL)
return SEEK_ERROR; /* In 512MB I/O hole */
kvm_addr -= kvm->iohole;
}
break;
case 0x40000000ULL:
if (physaddr >= 0xc0000000ULL) {
if (physaddr < 0x100000000ULL)
return SEEK_ERROR; /* In 1GB I/O hole */
kvm_addr -= kvm->iohole;
}
break;
}
if (lseek(kvm->mapfd, mapfile_offset(kvm_addr), SEEK_SET) < 0) {
if (CRASHDEBUG(1))
error(INFO, "load_mapfile_offset: "
"lseek error: physical: %llx %s offset: %llx\n",
(unsigned long long)physaddr, mapfile_in_use(),
(unsigned long long)mapfile_offset(kvm_addr));
return SEEK_ERROR;
}
if (read(kvm->mapfd, entry_ptr, sizeof(off_t)) != sizeof(off_t)) {
if (CRASHDEBUG(1))
error(INFO, "load_mapfile_offset: "
"read error: physical: %llx %s offset: %llx\n",
(unsigned long long)physaddr, mapfile_in_use(),
(unsigned long long)mapfile_offset(kvm_addr));
return READ_ERROR;
}
return 0;
}
static void
kvmdump_mapfile_create(char *filename)
{
int fdmem, n;
off_t offset;
char buf[4096];
if (kvm->flags & MAPFILE) {
error(INFO, "%s: mapfile in use\n", pc->kvmdump_mapfile);
return;
}
if (file_exists(filename, NULL)) {
error(INFO,
"%s: file already exists!\n", filename);
return;
}
if ((fdmem = open(filename, O_CREAT|O_RDWR, 0644)) < 0) {
error(INFO, "%s: open: %s\n", filename, strerror(errno));
return;
}
offset = kvm->mapinfo.map_start_offset;
if (lseek(kvm->mapfd, offset, SEEK_SET) < 0) {
error(INFO, "%s: leek: %s\n",
mapfile_in_use(), strerror(errno));
return;
}
while ((n = read(kvm->mapfd, buf, 4096)) > 0) {
if (write(fdmem, buf, n) != n) {
error(INFO, "%s: write: %s\n", filename,
strerror(errno));
break;
}
}
close(fdmem);
fprintf(fp, "MAP FILE CREATED: %s\n", filename);
}
static void
kvmdump_mapfile_append(void)
{
int n, fdcore;
ulong round_bytes;
struct stat statbuf;
uint64_t map_start_offset;
off_t eof, orig_dumpfile_size;
char buf[4096];
if (kvm->flags & MAPFILE_APPENDED)
error(FATAL, "mapfile already appended to %s\n",
pc->dumpfile);
if (access(pc->dumpfile, W_OK) != 0)
error(FATAL,
"%s: cannot append map information to this file\n",
pc->dumpfile);
if (stat(pc->dumpfile, &statbuf) < 0)
error(FATAL, "%s: stat: %s\n",
pc->dumpfile, strerror(errno));
round_bytes = (sizeof(uint64_t) - (statbuf.st_size % sizeof(uint64_t)))
% sizeof(uint64_t);
if ((fdcore = open(pc->dumpfile, O_WRONLY)) < 0)
error(FATAL, "%s: open: %s\n",
pc->dumpfile, strerror(errno));
if ((orig_dumpfile_size = lseek(fdcore, 0, SEEK_END)) < 0) {
error(INFO, "%s: lseek: %s\n", pc->dumpfile, strerror(errno));
goto bailout1;
}
if (round_bytes) {
BZERO(buf, round_bytes);
if (write(fdcore, buf, round_bytes) != round_bytes) {
error(INFO, "%s: write: %s\n",
pc->dumpfile, strerror(errno));
goto bailout2;
}
}
map_start_offset = orig_dumpfile_size + round_bytes;
if (lseek(kvm->mapfd, 0, SEEK_SET) != 0) {
error(INFO, "%s: lseek: %s\n",
mapfile_in_use(), strerror(errno));
goto bailout2;
}
while ((n = read(kvm->mapfd, buf, 4096)) > 0) {
if (write(fdcore, buf, n) != n) {
error(INFO, "%s: write: %s\n", pc->dumpfile,
strerror(errno));
goto bailout2;
}
}
/*
* Overwrite the map_start_offset value in the trailer to reflect
* its location in the appended-to dumpfile.
*/
eof = lseek(fdcore, 0, SEEK_END);
if (lseek(fdcore, eof - sizeof(struct mapinfo_trailer), SEEK_SET) < 0) {
error(INFO, "%s: write: %s\n", pc->dumpfile, strerror(errno));
goto bailout2;
}
if (write(fdcore, &map_start_offset, sizeof(uint64_t)) != sizeof(uint64_t)) {
error(INFO, "%s: write: %s\n", pc->dumpfile, strerror(errno));
goto bailout2;
}
close(fdcore);
kvm->flags |= MAPFILE_APPENDED;
fprintf(fp, "MAP FILE APPENDED TO: %s\n", pc->dumpfile);
return;
bailout2:
if (ftruncate(fdcore, (off_t)orig_dumpfile_size) < 0)
error(INFO, "%s: ftruncate: %s\n",
pc->dumpfile, strerror(errno));
bailout1:
close(fdcore);
error(INFO, "failed to append map to %s\n", pc->dumpfile);
}
int
is_kvmdump_mapfile(char *filename)
{
int fd;
struct mapinfo_trailer trailer;
off_t eof;
if ((fd = open(filename, O_RDONLY)) < 0) {
error(INFO, "%s: open: %s\n", filename, strerror(errno));
return FALSE;
}
if ((eof = lseek(fd, 0, SEEK_END)) == -1)
goto bailout;
if (lseek(fd, eof - sizeof(trailer), SEEK_SET) < 0) {
error(INFO, "%s: lseek: %s\n", filename, strerror(errno));
goto bailout;
}
if (read(fd, &trailer, sizeof(trailer)) != sizeof(trailer)) {
error(INFO, "%s: read: %s\n", filename, strerror(errno));
goto bailout;
}
if (trailer.magic == MAPFILE_MAGIC) {
if (pc->dumpfile && (trailer.checksum != kvm->mapinfo.checksum)) {
error(kvm->flags & MAPFILE_FOUND ? INFO : FATAL,
"checksum mismatch between %s and %s\n\n",
pc->dumpfile, filename);
goto bailout;
}
kvm->mapfd = fd;
kvm->flags |= MAPFILE;
return TRUE;
}
bailout:
close(fd);
return FALSE;
}
static int
kvmdump_mapfile_exists(void)
{
char *filename;
struct stat stat;
if (!(filename = malloc(strlen(pc->dumpfile) + strlen(".map") + 10)))
return FALSE;
sprintf(filename, "%s.map", pc->dumpfile);
if (!file_exists(filename, &stat) || !S_ISREG(stat.st_mode)) {
free(filename);
return FALSE;
}
if (is_kvmdump_mapfile(filename)) {
pc->kvmdump_mapfile = filename;
kvm->flags |= MAPFILE_FOUND;
return TRUE;
}
free(filename);
return FALSE;
}
void
cmd_map(void)
{
int c;
int append, file, specified;
char *mapfile;
append = file = specified = 0;
mapfile = NULL;
while ((c = getopt(argcnt, args, "af")) != EOF) {
switch(c)
{
case 'a':
append++;
break;
case 'f':
file++;
break;
default:
argerrs++;
break;
}
}
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
while (args[optind]) {
if (!mapfile) {
mapfile = args[optind];
specified++;
} else
cmd_usage(pc->curcmd, SYNOPSIS);
optind++;
}
if (file && !specified) {
mapfile = GETBUF(strlen(pc->dumpfile)+10);
sprintf(mapfile, "%s.map", pc->dumpfile);
}
if (append)
kvmdump_mapfile_append();
if (file) {
kvmdump_mapfile_create(mapfile);
if (!specified)
FREEBUF(mapfile);
}
if (!file && !append)
fprintf(fp, "MAP FILE IN USE: %s\n", mapfile_in_use());
}
static char *
mapfile_in_use(void)
{
char *name;
switch (kvm->flags & (TMPFILE|MAPFILE|MAPFILE_APPENDED))
{
default:
case TMPFILE:
case TMPFILE|MAPFILE_APPENDED:
name = "(tmpfile)";
break;
case MAPFILE:
case MAPFILE|MAPFILE_APPENDED:
name = pc->kvmdump_mapfile;
break;
case MAPFILE_APPENDED:
name = pc->dumpfile;
break;
}
return name;
}
static void
write_mapfile_trailer(void)
{
if (kvm->cpu_devices)
write_mapfile_registers();
kvm->mapinfo.magic = MAPFILE_MAGIC;
if (lseek(kvm->mapfd, 0, SEEK_END) < 0)
error(FATAL, "%s: lseek: %s\n", mapfile_in_use(), strerror(errno));
if (write(kvm->mapfd, &kvm->mapinfo, sizeof(struct mapinfo_trailer))
!= sizeof(struct mapinfo_trailer))
error(FATAL, "%s: write: %s\n", mapfile_in_use(), strerror(errno));
}
static void
write_mapfile_registers(void)
{
size_t regs_size;
uint64_t magic;
if (lseek(kvm->mapfd, 0, SEEK_END) < 0)
error(FATAL, "%s: lseek: %s\n", mapfile_in_use(), strerror(errno));
regs_size = sizeof(struct register_set) * kvm->cpu_devices;
if (write(kvm->mapfd, &kvm->registers[0], regs_size) != regs_size)
error(FATAL, "%s: write: %s\n", mapfile_in_use(), strerror(errno));
if (write(kvm->mapfd, &kvm->cpu_devices, sizeof(uint64_t)) != sizeof(uint64_t))
error(FATAL, "%s: write: %s\n", mapfile_in_use(), strerror(errno));
magic = REGS_MAGIC;
if (write(kvm->mapfd, &magic, sizeof(uint64_t)) != sizeof(uint64_t))
error(FATAL, "%s: write: %s\n", mapfile_in_use(), strerror(errno));
}
static void
read_mapfile_trailer(void)
{
off_t eof;
struct mapinfo_trailer trailer;
if ((eof = lseek(kvm->mapfd, 0, SEEK_END)) < 0)
error(FATAL, "%s: lseek: %s\n",
mapfile_in_use(), strerror(errno));
if (lseek(kvm->mapfd, eof - sizeof(trailer), SEEK_SET) < 0)
error(FATAL, "%s: lseek: %s\n",
mapfile_in_use(), strerror(errno));
if (read(kvm->mapfd, &trailer, sizeof(trailer)) != sizeof(trailer))
error(FATAL, "%s: read: %s\n",
mapfile_in_use(), strerror(errno));
if (kvm->mapinfo.checksum != trailer.checksum)
error(FATAL, "checksum mismatch between %s and %s\n",
pc->dumpfile, mapfile_in_use());