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xendump.c
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xendump.c
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/*
* xendump.c
*
* Copyright (C) 2006-2011, 2013-2014 David Anderson
* Copyright (C) 2006-2011, 2013-2014 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 "xendump.h"
static struct xendump_data xendump_data = { 0 };
struct xendump_data *xd = &xendump_data;
static int xc_save_verify(char *);
static int xc_core_verify(char *, char *);
static int xc_save_read(void *, int, ulong, physaddr_t);
static int xc_core_read(void *, int, ulong, physaddr_t);
static int xc_core_mfns(ulong, FILE *);
static void poc_store(ulong, off_t);
static off_t poc_get(ulong, int *);
static void xen_dump_vmconfig(FILE *);
static void xc_core_create_pfn_tables(void);
static ulong xc_core_pfn_to_page_index(ulong);
static int xc_core_pfn_valid(ulong);
static void xendump_print(char *fmt, ...);
static int xc_core_elf_verify(char *, char *);
static void xc_core_elf_dump(void);
static char *xc_core_elf_mfn_to_page(ulong, char *);
static int xc_core_elf_mfn_to_page_index(ulong);
static ulong xc_core_elf_pfn_valid(ulong);
static ulong xc_core_elf_pfn_to_page_index(ulong);
static void xc_core_dump_Elf32_Ehdr(Elf32_Ehdr *);
static void xc_core_dump_Elf64_Ehdr(Elf64_Ehdr *);
static void xc_core_dump_Elf32_Shdr(Elf32_Off offset, int);
static void xc_core_dump_Elf64_Shdr(Elf64_Off offset, int);
static char *xc_core_strtab(uint32_t, char *);
static void xc_core_dump_elfnote(off_t, size_t, int);
static void xc_core_elf_pfn_init(void);
#define ELFSTORE 1
#define ELFREAD 0
/*
* Determine whether a file is a xendump creation, and if TRUE,
* initialize the xendump_data structure.
*/
int
is_xendump(char *file)
{
int verified;
char buf[BUFSIZE];
if ((xd->xfd = open(file, O_RDWR)) < 0) {
if ((xd->xfd = open(file, O_RDONLY)) < 0) {
sprintf(buf, "%s: open", file);
perror(buf);
return FALSE;
}
}
if (read(xd->xfd, buf, BUFSIZE) != BUFSIZE)
return FALSE;
if (machine_type("X86") || machine_type("X86_64"))
xd->page_size = 4096;
else if (machine_type("IA64") && !machdep->pagesize)
xd->page_size = 16384;
else
xd->page_size = machdep->pagesize;
verified = xc_save_verify(buf) || xc_core_verify(file, buf);
if (!verified)
close(xd->xfd);
return (verified);
}
/*
* Verify whether the dump was created by the xc_domain_dumpcore()
* library function in libxc/xc_core.c.
*/
static int
xc_core_verify(char *file, char *buf)
{
struct xc_core_header *xcp;
xcp = (struct xc_core_header *)buf;
if (xc_core_elf_verify(file, buf))
return TRUE;
if ((xcp->xch_magic != XC_CORE_MAGIC) &&
(xcp->xch_magic != XC_CORE_MAGIC_HVM))
return FALSE;
if (!xcp->xch_nr_vcpus) {
error(INFO,
"faulty xc_core dump file header: xch_nr_vcpus is 0\n\n");
fprintf(stderr, " xch_magic: %x\n", xcp->xch_magic);
fprintf(stderr, " xch_nr_vcpus: %d\n", xcp->xch_nr_vcpus);
fprintf(stderr, " xch_nr_pages: %d\n", xcp->xch_nr_pages);
fprintf(stderr, " xch_ctxt_offset: %d\n", xcp->xch_ctxt_offset);
fprintf(stderr, " xch_index_offset: %d\n", xcp->xch_index_offset);
fprintf(stderr, " xch_pages_offset: %d\n\n", xcp->xch_pages_offset);
clean_exit(1);
}
xd->xc_core.header.xch_magic = xcp->xch_magic;
xd->xc_core.header.xch_nr_vcpus = xcp->xch_nr_vcpus;
xd->xc_core.header.xch_nr_pages = xcp->xch_nr_pages;
xd->xc_core.header.xch_ctxt_offset = (off_t)xcp->xch_ctxt_offset;
xd->xc_core.header.xch_index_offset = (off_t)xcp->xch_index_offset;
xd->xc_core.header.xch_pages_offset = (off_t)xcp->xch_pages_offset;
xd->flags |= (XENDUMP_LOCAL | XC_CORE_ORIG | XC_CORE_P2M_CREATE);
if (xc_core_mfns(XC_CORE_64BIT_HOST, stderr))
xd->flags |= XC_CORE_64BIT_HOST;
if (!xd->page_size)
error(FATAL,
"unknown page size: use -p <pagesize> command line option\n");
if (!(xd->page = (char *)malloc(xd->page_size)))
error(FATAL, "cannot malloc page space.");
if (!(xd->poc = (struct pfn_offset_cache *)calloc
(PFN_TO_OFFSET_CACHE_ENTRIES,
sizeof(struct pfn_offset_cache))))
error(FATAL, "cannot malloc pfn_offset_cache\n");
xd->last_pfn = ~(0UL);
if (CRASHDEBUG(1))
xendump_memory_dump(stderr);
return TRUE;
}
/*
* Do the work for read_xendump() for the XC_CORE dumpfile format.
*/
static int
xc_core_read(void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
ulong pfn, page_index;
off_t offset;
int redundant;
if (xd->flags & (XC_CORE_P2M_CREATE|XC_CORE_PFN_CREATE))
xc_core_create_pfn_tables();
pfn = (ulong)BTOP(paddr);
if ((offset = poc_get(pfn, &redundant))) {
if (!redundant) {
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
return SEEK_ERROR;
if (read(xd->xfd, xd->page, xd->page_size) !=
xd->page_size)
return READ_ERROR;
xd->last_pfn = pfn;
}
BCOPY(xd->page + PAGEOFFSET(paddr), bufptr, cnt);
return cnt;
}
if ((page_index = xc_core_pfn_to_page_index(pfn)) ==
PFN_NOT_FOUND)
return READ_ERROR;
offset = xd->xc_core.header.xch_pages_offset +
((off_t)(page_index) * (off_t)xd->page_size);
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
return SEEK_ERROR;
if (read(xd->xfd, xd->page, xd->page_size) != xd->page_size)
return READ_ERROR;
poc_store(pfn, offset);
BCOPY(xd->page + PAGEOFFSET(paddr), bufptr, cnt);
return cnt;
}
/*
* Verify whether the dumpfile was created by the "xm save" facility.
* This gets started by the "save" function in XendCheckpoint.py, and
* then by xc_save.c, with the work done in the xc_linux_save() library
* function in libxc/xc_linux_save.c.
*/
#define MAX_BATCH_SIZE 1024
/*
* Number of P2M entries in a page.
*/
#define ULPP (xd->page_size/sizeof(unsigned long))
/*
* Number of P2M entries in the pfn_to_mfn_frame_list.
*/
#define P2M_FL_ENTRIES (((xd->xc_save.nr_pfns)+ULPP-1)/ULPP)
/*
* Size in bytes of the pfn_to_mfn_frame_list.
*/
#define P2M_FL_SIZE ((P2M_FL_ENTRIES)*sizeof(unsigned long))
#define XTAB (0xf<<28) /* invalid page */
#define LTAB_MASK XTAB
static int
xc_save_verify(char *buf)
{
int i, batch_count, done_batch, *intptr;
ulong flags, *ulongptr;
ulong batch_index, total_pages_read;
ulong N;
if (!STRNEQ(buf, XC_SAVE_SIGNATURE))
return FALSE;
if (lseek(xd->xfd, strlen(XC_SAVE_SIGNATURE), SEEK_SET) == -1)
return FALSE;
flags = XC_SAVE;
if (CRASHDEBUG(1)) {
fprintf(stderr, "\"%s\"\n", buf);
fprintf(stderr, "endian: %d %s\n", __BYTE_ORDER,
__BYTE_ORDER == __BIG_ENDIAN ? "__BIG_ENDIAN" :
(__BYTE_ORDER == __LITTLE_ENDIAN ?
"__LITTLE_ENDIAN" : "???"));
}
/*
* size of vmconfig data structure (big-endian)
*/
if (read(xd->xfd, buf, sizeof(int)) != sizeof(int))
return FALSE;
intptr = (int *)buf;
if (CRASHDEBUG(1) && BYTE_SWAP_REQUIRED(__BIG_ENDIAN)) {
fprintf(stderr, "byte-swap required for this:\n");
for (i = 0; i < sizeof(int); i++)
fprintf(stderr, "[%x]", buf[i] & 0xff);
fprintf(stderr, ": %x -> ", *intptr);
}
xd->xc_save.vmconfig_size = swab32(*intptr);
if (CRASHDEBUG(1))
fprintf(stderr, "%x\n", xd->xc_save.vmconfig_size);
if (!(xd->xc_save.vmconfig_buf = (char *)malloc
(xd->xc_save.vmconfig_size)))
error(FATAL, "cannot malloc xc_save vmconfig space.");
if (!xd->page_size)
error(FATAL,
"unknown page size: use -p <pagesize> command line option\n");
if (!(xd->page = (char *)malloc(xd->page_size)))
error(FATAL, "cannot malloc page space.");
if (!(xd->poc = (struct pfn_offset_cache *)calloc
(PFN_TO_OFFSET_CACHE_ENTRIES,
sizeof(struct pfn_offset_cache))))
error(FATAL, "cannot malloc pfn_offset_cache\n");
xd->last_pfn = ~(0UL);
if (!(xd->xc_save.region_pfn_type = (ulong *)calloc
(MAX_BATCH_SIZE, sizeof(ulong))))
error(FATAL, "cannot malloc region_pfn_type\n");
if (read(xd->xfd, xd->xc_save.vmconfig_buf,
xd->xc_save.vmconfig_size) != xd->xc_save.vmconfig_size)
goto xc_save_bailout;
/*
* nr_pfns (native byte order)
*/
if (read(xd->xfd, buf, sizeof(ulong)) != sizeof(ulong))
goto xc_save_bailout;
ulongptr = (ulong *)buf;
if (CRASHDEBUG(1)) {
for (i = 0; i < sizeof(ulong); i++)
fprintf(stderr, "[%x]", buf[i] & 0xff);
fprintf(stderr, ": %lx (nr_pfns)\n", *ulongptr);
}
xd->xc_save.nr_pfns = *ulongptr;
if (machine_type("IA64"))
goto xc_save_ia64;
/*
* Get a local copy of the live_P2M_frame_list
*/
if (!(xd->xc_save.p2m_frame_list = (unsigned long *)malloc(P2M_FL_SIZE)))
error(FATAL, "cannot allocate p2m_frame_list array");
if (!(xd->xc_save.batch_offsets = (off_t *)calloc((size_t)P2M_FL_ENTRIES,
sizeof(off_t))))
error(FATAL, "cannot allocate batch_offsets array");
xd->xc_save.batch_count = P2M_FL_ENTRIES;
if (read(xd->xfd, xd->xc_save.p2m_frame_list, P2M_FL_SIZE) !=
P2M_FL_SIZE)
goto xc_save_bailout;
if (CRASHDEBUG(1))
fprintf(stderr, "pre-batch file pointer: %lld\n",
(ulonglong)lseek(xd->xfd, 0L, SEEK_CUR));
/*
* ...
* int batch_count
* ulong region pfn_type[batch_count]
* page 0
* page 1
* ...
* page batch_count-1
* (repeat)
*/
total_pages_read = 0;
batch_index = 0;
done_batch = FALSE;
while (!done_batch) {
xd->xc_save.batch_offsets[batch_index] = (off_t)
lseek(xd->xfd, 0L, SEEK_CUR);
if (read(xd->xfd, &batch_count, sizeof(int)) != sizeof(int))
goto xc_save_bailout;
if (CRASHDEBUG(1))
fprintf(stderr, "batch[%ld]: %d ",
batch_index, batch_count);
batch_index++;
if (batch_index >= P2M_FL_ENTRIES) {
fprintf(stderr, "more than %ld batches encountered?\n",
P2M_FL_ENTRIES);
goto xc_save_bailout;
}
switch (batch_count)
{
case 0:
if (CRASHDEBUG(1)) {
fprintf(stderr,
": Batch work is done: %ld pages read (P2M_FL_ENTRIES: %ld)\n",
total_pages_read, P2M_FL_ENTRIES);
}
done_batch = TRUE;
continue;
case -1:
if (CRASHDEBUG(1))
fprintf(stderr, ": Entering page verify mode\n");
continue;
default:
if (batch_count > MAX_BATCH_SIZE) {
if (CRASHDEBUG(1))
fprintf(stderr,
": Max batch size exceeded. Giving up.\n");
done_batch = TRUE;
continue;
}
if (CRASHDEBUG(1))
fprintf(stderr, "\n");
break;
}
if (read(xd->xfd, xd->xc_save.region_pfn_type, batch_count * sizeof(ulong)) !=
batch_count * sizeof(ulong))
goto xc_save_bailout;
for (i = 0; i < batch_count; i++) {
unsigned long pagetype;
unsigned long pfn;
pfn = xd->xc_save.region_pfn_type[i] & ~LTAB_MASK;
pagetype = xd->xc_save.region_pfn_type[i] & LTAB_MASK;
if (pagetype == XTAB)
/* a bogus/unmapped page: skip it */
continue;
if (pfn > xd->xc_save.nr_pfns) {
if (CRASHDEBUG(1))
fprintf(stderr,
"batch_count: %d pfn %ld out of range",
batch_count, pfn);
}
if (lseek(xd->xfd, xd->page_size, SEEK_CUR) == -1)
goto xc_save_bailout;
total_pages_read++;
}
}
/*
* Get the list of PFNs that are not in the psuedo-phys map
*/
if (read(xd->xfd, &xd->xc_save.pfns_not,
sizeof(xd->xc_save.pfns_not)) != sizeof(xd->xc_save.pfns_not))
goto xc_save_bailout;
if (CRASHDEBUG(1))
fprintf(stderr, "PFNs not in pseudo-phys map: %d\n",
xd->xc_save.pfns_not);
if ((total_pages_read + xd->xc_save.pfns_not) !=
xd->xc_save.nr_pfns)
error(WARNING,
"nr_pfns: %ld != (total pages: %ld + pages not saved: %d)\n",
xd->xc_save.nr_pfns, total_pages_read,
xd->xc_save.pfns_not);
xd->xc_save.pfns_not_offset = lseek(xd->xfd, 0L, SEEK_CUR);
if (lseek(xd->xfd, sizeof(ulong) * xd->xc_save.pfns_not, SEEK_CUR) == -1)
goto xc_save_bailout;
xd->xc_save.vcpu_ctxt_offset = lseek(xd->xfd, 0L, SEEK_CUR);
lseek(xd->xfd, 0, SEEK_END);
lseek(xd->xfd, -((off_t)(xd->page_size)), SEEK_CUR);
xd->xc_save.shared_info_page_offset = lseek(xd->xfd, 0L, SEEK_CUR);
xd->flags |= (XENDUMP_LOCAL | flags);
kt->xen_flags |= (CANONICAL_PAGE_TABLES|XEN_SUSPEND);
if (CRASHDEBUG(1))
xendump_memory_dump(stderr);
return TRUE;
xc_save_ia64:
/*
* Completely different format for ia64:
*
* ...
* pfn #
* page data
* pfn #
* page data
* ...
*/
free(xd->poc);
xd->poc = NULL;
free(xd->xc_save.region_pfn_type);
xd->xc_save.region_pfn_type = NULL;
if (!(xd->xc_save.ia64_page_offsets =
(ulong *)calloc(xd->xc_save.nr_pfns, sizeof(off_t))))
error(FATAL, "cannot allocate ia64_page_offsets array");
/*
* version
*/
if (read(xd->xfd, buf, sizeof(ulong)) != sizeof(ulong))
goto xc_save_bailout;
xd->xc_save.ia64_version = *((ulong *)buf);
if (CRASHDEBUG(1))
fprintf(stderr, "ia64 version: %lx\n",
xd->xc_save.ia64_version);
/*
* xen_domctl_arch_setup structure
*/
if (read(xd->xfd, buf, sizeof(xen_domctl_arch_setup_t)) !=
sizeof(xen_domctl_arch_setup_t))
goto xc_save_bailout;
if (CRASHDEBUG(1)) {
xen_domctl_arch_setup_t *setup =
(xen_domctl_arch_setup_t *)buf;
fprintf(stderr, "xen_domctl_arch_setup:\n");
fprintf(stderr, " flags: %lx\n", (ulong)setup->flags);
fprintf(stderr, " bp: %lx\n", (ulong)setup->bp);
fprintf(stderr, " maxmem: %lx\n", (ulong)setup->maxmem);
fprintf(stderr, " xsi_va: %lx\n", (ulong)setup->xsi_va);
fprintf(stderr, "hypercall_imm: %x\n", setup->hypercall_imm);
}
for (i = N = 0; i < xd->xc_save.nr_pfns; i++) {
if (read(xd->xfd, &N, sizeof(N)) != sizeof(N))
goto xc_save_bailout;
if (N < xd->xc_save.nr_pfns)
xd->xc_save.ia64_page_offsets[N] =
lseek(xd->xfd, 0, SEEK_CUR);
else
error(WARNING,
"[%d]: pfn of %lx (0x%lx) in ia64 canonical page list exceeds %ld\n",
i, N, N, xd->xc_save.nr_pfns);
if (CRASHDEBUG(1)) {
if ((i < 10) || (N >= (xd->xc_save.nr_pfns-10)))
fprintf(stderr, "[%d]: %ld\n%s", i, N,
i == 9 ? "...\n" : "");
}
if ((N+1) >= xd->xc_save.nr_pfns)
break;
if (lseek(xd->xfd, xd->page_size, SEEK_CUR) == -1)
goto xc_save_bailout;
}
if (CRASHDEBUG(1)) {
for (i = N = 0; i < xd->xc_save.nr_pfns; i++) {
if (!xd->xc_save.ia64_page_offsets[i])
N++;
}
fprintf(stderr, "%ld out of %ld pfns not dumped\n",
N, xd->xc_save.nr_pfns);
}
xd->flags |= (XENDUMP_LOCAL | flags | XC_SAVE_IA64);
kt->xen_flags |= (CANONICAL_PAGE_TABLES|XEN_SUSPEND);
if (CRASHDEBUG(1))
xendump_memory_dump(stderr);
return TRUE;
xc_save_bailout:
error(INFO,
"xc_save_verify: \"LinuxGuestRecord\" file handling/format error\n");
if (xd->xc_save.p2m_frame_list) {
free(xd->xc_save.p2m_frame_list);
xd->xc_save.p2m_frame_list = NULL;
}
if (xd->xc_save.batch_offsets) {
free(xd->xc_save.batch_offsets);
xd->xc_save.batch_offsets = NULL;
}
if (xd->xc_save.vmconfig_buf) {
free(xd->xc_save.vmconfig_buf);
xd->xc_save.vmconfig_buf = NULL;
}
if (xd->page) {
free(xd->page);
xd->page = NULL;
}
return FALSE;
}
/*
* Do the work for read_xendump() for the XC_SAVE dumpfile format.
*/
static int
xc_save_read(void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
int b, i, redundant;
ulong reqpfn;
int batch_count;
off_t file_offset;
reqpfn = (ulong)BTOP(paddr);
if (CRASHDEBUG(8))
fprintf(xd->ofp,
"xc_save_read(bufptr: %lx cnt: %d addr: %lx paddr: %llx (%ld, 0x%lx)\n",
(ulong)bufptr, cnt, addr, (ulonglong)paddr, reqpfn, reqpfn);
if (xd->flags & XC_SAVE_IA64) {
if (reqpfn >= xd->xc_save.nr_pfns) {
if (CRASHDEBUG(1))
fprintf(xd->ofp,
"xc_save_read: pfn %lx too large: nr_pfns: %lx\n",
reqpfn, xd->xc_save.nr_pfns);
return SEEK_ERROR;
}
file_offset = xd->xc_save.ia64_page_offsets[reqpfn];
if (!file_offset) {
if (CRASHDEBUG(1))
fprintf(xd->ofp,
"xc_save_read: pfn %lx not stored in xendump\n",
reqpfn);
return SEEK_ERROR;
}
if (reqpfn != xd->last_pfn) {
if (lseek(xd->xfd, file_offset, SEEK_SET) == -1)
return SEEK_ERROR;
if (read(xd->xfd, xd->page, xd->page_size) != xd->page_size)
return READ_ERROR;
} else {
xd->redundant++;
xd->cache_hits++;
}
xd->accesses++;
xd->last_pfn = reqpfn;
BCOPY(xd->page + PAGEOFFSET(paddr), bufptr, cnt);
return cnt;
}
if ((file_offset = poc_get(reqpfn, &redundant))) {
if (!redundant) {
if (lseek(xd->xfd, file_offset, SEEK_SET) == -1)
return SEEK_ERROR;
if (read(xd->xfd, xd->page, xd->page_size) != xd->page_size)
return READ_ERROR;
xd->last_pfn = reqpfn;
} else if (CRASHDEBUG(1))
console("READ %ld (0x%lx) skipped!\n", reqpfn, reqpfn);
BCOPY(xd->page + PAGEOFFSET(paddr), bufptr, cnt);
return cnt;
}
/*
* ...
* int batch_count
* ulong region pfn_type[batch_count]
* page 0
* page 1
* ...
* page batch_count-1
* (repeat)
*/
for (b = 0; b < xd->xc_save.batch_count; b++) {
if (lseek(xd->xfd, xd->xc_save.batch_offsets[b], SEEK_SET) == -1)
return SEEK_ERROR;
if (CRASHDEBUG(8))
fprintf(xd->ofp, "check batch[%d]: offset: %llx\n",
b, (ulonglong)xd->xc_save.batch_offsets[b]);
if (read(xd->xfd, &batch_count, sizeof(int)) != sizeof(int))
return READ_ERROR;
switch (batch_count)
{
case 0:
if (CRASHDEBUG(1) && !STREQ(pc->curcmd, "search")) {
fprintf(xd->ofp,
"batch[%d]: has count of zero -- bailing out on pfn %ld\n",
b, reqpfn);
}
return READ_ERROR;
case -1:
return READ_ERROR;
default:
if (CRASHDEBUG(8))
fprintf(xd->ofp,
"batch[%d]: offset: %llx batch count: %d\n",
b, (ulonglong)xd->xc_save.batch_offsets[b],
batch_count);
break;
}
if (read(xd->xfd, xd->xc_save.region_pfn_type, batch_count * sizeof(ulong)) !=
batch_count * sizeof(ulong))
return READ_ERROR;
for (i = 0; i < batch_count; i++) {
unsigned long pagetype;
unsigned long pfn;
pfn = xd->xc_save.region_pfn_type[i] & ~LTAB_MASK;
pagetype = xd->xc_save.region_pfn_type[i] & LTAB_MASK;
if (pagetype == XTAB)
/* a bogus/unmapped page: skip it */
continue;
if (pfn > xd->xc_save.nr_pfns) {
if (CRASHDEBUG(1))
fprintf(stderr,
"batch_count: %d pfn %ld out of range",
batch_count, pfn);
}
if (pfn == reqpfn) {
file_offset = lseek(xd->xfd, 0, SEEK_CUR);
poc_store(pfn, file_offset);
if (read(xd->xfd, xd->page, xd->page_size) !=
xd->page_size)
return READ_ERROR;
BCOPY(xd->page + PAGEOFFSET(paddr), bufptr, cnt);
return cnt;
}
if (lseek(xd->xfd, xd->page_size, SEEK_CUR) == -1)
return SEEK_ERROR;
}
}
return READ_ERROR;
}
/*
* Stash a pfn's offset. If they're all in use, put it in the
* least-used slot that's closest to the beginning of the array.
*/
static void
poc_store(ulong pfn, off_t file_offset)
{
int i;
struct pfn_offset_cache *poc, *plow;
ulong curlow;
curlow = ~(0UL);
plow = NULL;
poc = xd->poc;
for (i = 0; i < PFN_TO_OFFSET_CACHE_ENTRIES; i++, poc++) {
if (poc->cnt == 0) {
poc->cnt = 1;
poc->pfn = pfn;
poc->file_offset = file_offset;
xd->last_pfn = pfn;
return;
}
if (poc->cnt < curlow) {
curlow = poc->cnt;
plow = poc;
}
}
plow->cnt = 1;
plow->pfn = pfn;
plow->file_offset = file_offset;
xd->last_pfn = pfn;
}
/*
* Check whether a pfn's offset has been cached.
*/
static off_t
poc_get(ulong pfn, int *redundant)
{
int i;
struct pfn_offset_cache *poc;
xd->accesses++;
if (pfn == xd->last_pfn) {
xd->redundant++;
*redundant = TRUE;
return 1;
} else
*redundant = FALSE;
poc = xd->poc;
for (i = 0; i < PFN_TO_OFFSET_CACHE_ENTRIES; i++, poc++) {
if (poc->cnt && (poc->pfn == pfn)) {
poc->cnt++;
xd->cache_hits++;
return poc->file_offset;
}
}
return 0;
}
/*
* Perform any post-dumpfile determination stuff here.
*/
int
xendump_init(char *unused, FILE *fptr)
{
if (!XENDUMP_VALID())
return FALSE;
xd->ofp = fptr;
return TRUE;
}
int
read_xendump(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
if (pc->curcmd_flags & XEN_MACHINE_ADDR)
return READ_ERROR;
switch (xd->flags & (XC_SAVE|XC_CORE_ORIG|XC_CORE_ELF))
{
case XC_SAVE:
return xc_save_read(bufptr, cnt, addr, paddr);
case XC_CORE_ORIG:
case XC_CORE_ELF:
return xc_core_read(bufptr, cnt, addr, paddr);
default:
return READ_ERROR;
}
}
int
read_xendump_hyper(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
ulong pfn, page_index;
off_t offset;
pfn = (ulong)BTOP(paddr);
/* ODA: pfn == mfn !!! */
if ((page_index = xc_core_mfn_to_page_index(pfn)) == PFN_NOT_FOUND)
return READ_ERROR;
offset = xd->xc_core.header.xch_pages_offset +
((off_t)(page_index) * (off_t)xd->page_size);
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
return SEEK_ERROR;
if (read(xd->xfd, xd->page, xd->page_size) != xd->page_size)
return READ_ERROR;
BCOPY(xd->page + PAGEOFFSET(paddr), bufptr, cnt);
return cnt;
}
int
write_xendump(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
return WRITE_ERROR;
}
uint
xendump_page_size(void)
{
if (!XENDUMP_VALID())
return 0;
return xd->page_size;
}
/*
* xendump_free_memory(), and xendump_memory_used()
* are debug only, and typically unnecessary to implement.
*/
int
xendump_free_memory(void)
{
return 0;
}
int
xendump_memory_used(void)
{
return 0;
}
/*
* This function is dump-type independent, used here to
* to dump the xendump_data structure contents.
*/
int
xendump_memory_dump(FILE *fp)
{
int i, linefeed, used, others;
ulong *ulongptr;
Elf32_Off offset32;
Elf64_Off offset64;
FILE *fpsave;
fprintf(fp, " flags: %lx (", xd->flags);
others = 0;
if (xd->flags & XENDUMP_LOCAL)
fprintf(fp, "%sXENDUMP_LOCAL", others++ ? "|" : "");
if (xd->flags & XC_SAVE)
fprintf(fp, "%sXC_SAVE", others++ ? "|" : "");
if (xd->flags & XC_CORE_ORIG)
fprintf(fp, "%sXC_CORE_ORIG", others++ ? "|" : "");
if (xd->flags & XC_CORE_ELF)
fprintf(fp, "%sXC_CORE_ELF", others++ ? "|" : "");
if (xd->flags & XC_CORE_P2M_CREATE)
fprintf(fp, "%sXC_CORE_P2M_CREATE", others++ ? "|" : "");
if (xd->flags & XC_CORE_PFN_CREATE)
fprintf(fp, "%sXC_CORE_PFN_CREATE", others++ ? "|" : "");
if (xd->flags & XC_CORE_NO_P2M)
fprintf(fp, "%sXC_CORE_NO_P2M", others++ ? "|" : "");
if (xd->flags & XC_SAVE_IA64)
fprintf(fp, "%sXC_SAVE_IA64", others++ ? "|" : "");
if (xd->flags & XC_CORE_64BIT_HOST)
fprintf(fp, "%sXC_CORE_64BIT_HOST", others++ ? "|" : "");
fprintf(fp, ")\n");
fprintf(fp, " xfd: %d\n", xd->xfd);
fprintf(fp, " page_size: %d\n", xd->page_size);
fprintf(fp, " ofp: %lx\n", (ulong)xd->ofp);
fprintf(fp, " page: %lx\n", (ulong)xd->page);
fprintf(fp, " panic_pc: %lx\n", xd->panic_pc);
fprintf(fp, " panic_sp: %lx\n", xd->panic_sp);
fprintf(fp, " accesses: %ld\n", (ulong)xd->accesses);
fprintf(fp, " cache_hits: %ld ", (ulong)xd->cache_hits);
if (xd->accesses)
fprintf(fp, "(%ld%%)\n", xd->cache_hits * 100 / xd->accesses);
else
fprintf(fp, "\n");
fprintf(fp, " last_pfn: %ld\n", xd->last_pfn);
fprintf(fp, " redundant: %ld ", (ulong)xd->redundant);
if (xd->accesses)
fprintf(fp, "(%ld%%)\n", xd->redundant * 100 / xd->accesses);
else
fprintf(fp, "\n");
for (i = used = 0; i < PFN_TO_OFFSET_CACHE_ENTRIES; i++)
if (xd->poc && xd->poc[i].cnt)
used++;
if (xd->poc)
fprintf(fp, " poc[%d]: %lx %s", PFN_TO_OFFSET_CACHE_ENTRIES,
(ulong)xd->poc, xd->poc ? "" : "(none)");
else
fprintf(fp, " poc[0]: (unused)\n");
for (i = 0; i < PFN_TO_OFFSET_CACHE_ENTRIES; i++) {
if (!xd->poc)
break;
if (!xd->poc[i].cnt) {
if (!i)
fprintf(fp, "(none used)\n");
break;
} else if (!i)
fprintf(fp, "(%d used)\n", used);
if (CRASHDEBUG(2))
fprintf(fp,
" [%d]: pfn: %ld (0x%lx) count: %ld file_offset: %llx\n",
i,
xd->poc[i].pfn,
xd->poc[i].pfn,
xd->poc[i].cnt,
(ulonglong)xd->poc[i].file_offset);
}
if (!xd->poc)
fprintf(fp, "\n");
fprintf(fp, "\n xc_save:\n");
fprintf(fp, " nr_pfns: %ld (0x%lx)\n",
xd->xc_save.nr_pfns, xd->xc_save.nr_pfns);
fprintf(fp, " vmconfig_size: %d (0x%x)\n", xd->xc_save.vmconfig_size,
xd->xc_save.vmconfig_size);
fprintf(fp, " vmconfig_buf: %lx\n", (ulong)xd->xc_save.vmconfig_buf);
if (xd->flags & XC_SAVE)
xen_dump_vmconfig(fp);
fprintf(fp, " p2m_frame_list: %lx ", (ulong)xd->xc_save.p2m_frame_list);
if ((xd->flags & XC_SAVE) && xd->xc_save.p2m_frame_list) {
fprintf(fp, "\n");
ulongptr = xd->xc_save.p2m_frame_list;
for (i = 0; i < P2M_FL_ENTRIES; i++, ulongptr++)
fprintf(fp, "%ld ", *ulongptr);
fprintf(fp, "\n");
} else
fprintf(fp, "(none)\n");
fprintf(fp, " pfns_not: %d\n", xd->xc_save.pfns_not);
fprintf(fp, " pfns_not_offset: %lld\n",
(ulonglong)xd->xc_save.pfns_not_offset);