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dump: add Windows dump format to dump-guest-memory

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This patch adds Windows crashdumping feature. Now QEMU can produce ELF-dump
containing Windows crashdump header, which can help to convert to a valid
WinDbg-understandable crashdump file, or immediately create such file.
The crashdump will be obtained by joining physical memory dump and 8K header
exposed through vmcoreinfo/fw_cfg device by guest driver at BSOD time. Option
'-w' was added to dump-guest-memory command. At the moment, only x64
configuration is supported.
Suitable driver can be found at
https://github.com/virtio-win/kvm-guest-drivers-windows/tree/master/fwcfg64

Signed-off-by: Viktor Prutyanov <viktor.prutyanov@virtuozzo.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180517162342.4330-2-viktor.prutyanov@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Viktor Prutyanov 2018-05-17 19:23:39 +03:00 committed by Paolo Bonzini
parent 2266d44311
commit 2da91b54fe
7 changed files with 339 additions and 9 deletions
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1
Makefile.target
View file

@ -143,6 +143,7 @@ obj-y += hw/
obj-y += memory.o
obj-y += memory_mapping.o
obj-y += dump.o
obj-$(TARGET_X86_64) += win_dump.o
obj-y += migration/ram.o
LIBS := $(libs_softmmu) $(LIBS)

24
dump.c
View file

@ -29,6 +29,10 @@
#include "qemu/error-report.h"
#include "hw/misc/vmcoreinfo.h"
#ifdef TARGET_X86_64
#include "win_dump.h"
#endif
#include <zlib.h>
#ifdef CONFIG_LZO
#include <lzo/lzo1x.h>
@ -1866,7 +1870,11 @@ static void dump_process(DumpState *s, Error **errp)
Error *local_err = NULL;
DumpQueryResult *result = NULL;
if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) {
#ifdef TARGET_X86_64
create_win_dump(s, &local_err);
#endif
} else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
create_kdump_vmcore(s, &local_err);
} else {
create_vmcore(s, &local_err);
@ -1970,6 +1978,13 @@ void qmp_dump_guest_memory(bool paging, const char *file,
}
#endif
#ifndef TARGET_X86_64
if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) {
error_setg(errp, "Windows dump is only available for x86-64");
return;
}
#endif
#if !defined(WIN32)
if (strstart(file, "fd:", &p)) {
fd = monitor_get_fd(cur_mon, p, errp);
@ -2044,5 +2059,12 @@ DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
#endif
/* Windows dump is available only if target is x86_64 */
#ifdef TARGET_X86_64
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
item = item->next;
item->value = DUMP_GUEST_MEMORY_FORMAT_WIN_DMP;
#endif
return cap;
}

13
hmp-commands.hx
View file

@ -1136,30 +1136,33 @@ ETEXI
{
.name = "dump-guest-memory",
.args_type = "paging:-p,detach:-d,zlib:-z,lzo:-l,snappy:-s,filename:F,begin:l?,length:l?",
.params = "[-p] [-d] [-z|-l|-s] filename [begin length]",
.args_type = "paging:-p,detach:-d,windmp:-w,zlib:-z,lzo:-l,snappy:-s,filename:F,begin:l?,length:l?",
.params = "[-p] [-d] [-z|-l|-s|-w] filename [begin length]",
.help = "dump guest memory into file 'filename'.\n\t\t\t"
"-p: do paging to get guest's memory mapping.\n\t\t\t"
"-d: return immediately (do not wait for completion).\n\t\t\t"
"-z: dump in kdump-compressed format, with zlib compression.\n\t\t\t"
"-l: dump in kdump-compressed format, with lzo compression.\n\t\t\t"
"-s: dump in kdump-compressed format, with snappy compression.\n\t\t\t"
"-w: dump in Windows crashdump format (can be used instead of ELF-dump converting),\n\t\t\t"
" for Windows x64 guests with vmcoreinfo driver only.\n\t\t\t"
"begin: the starting physical address.\n\t\t\t"
"length: the memory size, in bytes.",
.cmd = hmp_dump_guest_memory,
},
STEXI
@item dump-guest-memory [-p] @var{filename} @var{begin} @var{length}
@item dump-guest-memory [-z|-l|-s] @var{filename}
@item dump-guest-memory [-z|-l|-s|-w] @var{filename}
@findex dump-guest-memory
Dump guest memory to @var{protocol}. The file can be processed with crash or
gdb. Without -z|-l|-s, the dump format is ELF.
gdb. Without -z|-l|-s|-w, the dump format is ELF.
-p: do paging to get guest's memory mapping.
-z: dump in kdump-compressed format, with zlib compression.
-l: dump in kdump-compressed format, with lzo compression.
-s: dump in kdump-compressed format, with snappy compression.
-w: dump in Windows crashdump format (can be used instead of ELF-dump converting),
for Windows x64 guests with vmcoreinfo driver only
filename: dump file name.
begin: the starting physical address. It's optional, and should be
specified together with length.

9
hmp.c
View file

@ -2014,6 +2014,7 @@ void hmp_device_del(Monitor *mon, const QDict *qdict)
void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
bool win_dmp = qdict_get_try_bool(qdict, "windmp", false);
bool paging = qdict_get_try_bool(qdict, "paging", false);
bool zlib = qdict_get_try_bool(qdict, "zlib", false);
bool lzo = qdict_get_try_bool(qdict, "lzo", false);
@ -2028,12 +2029,16 @@ void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
enum DumpGuestMemoryFormat dump_format = DUMP_GUEST_MEMORY_FORMAT_ELF;
char *prot;
if (zlib + lzo + snappy > 1) {
error_setg(&err, "only one of '-z|-l|-s' can be set");
if (zlib + lzo + snappy + win_dmp > 1) {
error_setg(&err, "only one of '-z|-l|-s|-w' can be set");
hmp_handle_error(mon, &err);
return;
}
if (win_dmp) {
dump_format = DUMP_GUEST_MEMORY_FORMAT_WIN_DMP;
}
if (zlib) {
dump_format = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB;
}

5
qapi/misc.json
View file

@ -1677,10 +1677,13 @@
#
# @kdump-snappy: kdump-compressed format with snappy-compressed
#
# @win-dmp: Windows full crashdump format,
# can be used instead of ELF converting (since 2.13)
#
# Since: 2.0
##
{ 'enum': 'DumpGuestMemoryFormat',
'data': [ 'elf', 'kdump-zlib', 'kdump-lzo', 'kdump-snappy' ] }
'data': [ 'elf', 'kdump-zlib', 'kdump-lzo', 'kdump-snappy', 'win-dmp' ] }
##
# @dump-guest-memory:

209
win_dump.c Normal file
View file

@ -0,0 +1,209 @@
/*
* Windows crashdump
*
* Copyright (c) 2018 Virtuozzo International GmbH
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "elf.h"
#include "cpu.h"
#include "exec/hwaddr.h"
#include "monitor/monitor.h"
#include "sysemu/kvm.h"
#include "sysemu/dump.h"
#include "sysemu/sysemu.h"
#include "sysemu/memory_mapping.h"
#include "sysemu/cpus.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "hw/misc/vmcoreinfo.h"
#include "win_dump.h"
static size_t write_run(WinDumpPhyMemRun64 *run, int fd, Error **errp)
{
void *buf;
uint64_t addr = run->BasePage << TARGET_PAGE_BITS;
uint64_t size = run->PageCount << TARGET_PAGE_BITS;
uint64_t len = size;
buf = cpu_physical_memory_map(addr, &len, false);
if (!buf) {
error_setg(errp, "win-dump: failed to map run");
return 0;
}
if (len != size) {
error_setg(errp, "win-dump: failed to map entire run");
len = 0;
goto out_unmap;
}
len = qemu_write_full(fd, buf, len);
if (len != size) {
error_setg(errp, QERR_IO_ERROR);
}
out_unmap:
cpu_physical_memory_unmap(buf, addr, false, len);
return len;
}
static void write_runs(DumpState *s, WinDumpHeader64 *h, Error **errp)
{
WinDumpPhyMemDesc64 *desc = &h->PhysicalMemoryBlock;
WinDumpPhyMemRun64 *run = desc->Run;
Error *local_err = NULL;
int i;
for (i = 0; i < desc->NumberOfRuns; i++) {
s->written_size += write_run(run + i, s->fd, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
}
static void patch_mm_pfn_database(WinDumpHeader64 *h, Error **errp)
{
if (cpu_memory_rw_debug(first_cpu,
h->KdDebuggerDataBlock + KDBG_MM_PFN_DATABASE_OFFSET64,
(uint8_t *)&h->PfnDatabase, sizeof(h->PfnDatabase), 0)) {
error_setg(errp, "win-dump: failed to read MmPfnDatabase");
return;
}
}
static void patch_bugcheck_data(WinDumpHeader64 *h, Error **errp)
{
uint64_t KiBugcheckData;
if (cpu_memory_rw_debug(first_cpu,
h->KdDebuggerDataBlock + KDBG_KI_BUGCHECK_DATA_OFFSET64,
(uint8_t *)&KiBugcheckData, sizeof(KiBugcheckData), 0)) {
error_setg(errp, "win-dump: failed to read KiBugcheckData");
return;
}
if (cpu_memory_rw_debug(first_cpu,
KiBugcheckData,
h->BugcheckData, sizeof(h->BugcheckData), 0)) {
error_setg(errp, "win-dump: failed to read bugcheck data");
return;
}
}
/*
* This routine tries to correct mistakes in crashdump header.
*/
static void patch_header(WinDumpHeader64 *h)
{
Error *local_err = NULL;
h->RequiredDumpSpace = sizeof(WinDumpHeader64) +
(h->PhysicalMemoryBlock.NumberOfPages << TARGET_PAGE_BITS);
h->PhysicalMemoryBlock.unused = 0;
h->unused1 = 0;
/*
* We assume h->DirectoryBase and current CR3 are the same when we access
* memory by virtual address. In other words, we suppose current context
* is system context. It is definetely true in case of BSOD.
*/
patch_mm_pfn_database(h, &local_err);
if (local_err) {
warn_report_err(local_err);
local_err = NULL;
}
patch_bugcheck_data(h, &local_err);
if (local_err) {
warn_report_err(local_err);
}
}
static void check_header(WinDumpHeader64 *h, Error **errp)
{
const char Signature[] = "PAGE";
const char ValidDump[] = "DU64";
if (memcmp(h->Signature, Signature, sizeof(h->Signature))) {
error_setg(errp, "win-dump: invalid header, expected '%.4s',"
" got '%.4s'", Signature, h->Signature);
return;
}
if (memcmp(h->ValidDump, ValidDump, sizeof(h->ValidDump))) {
error_setg(errp, "win-dump: invalid header, expected '%.4s',"
" got '%.4s'", ValidDump, h->ValidDump);
return;
}
}
static void check_kdbg(WinDumpHeader64 *h, Error **errp)
{
const char OwnerTag[] = "KDBG";
char read_OwnerTag[4];
if (cpu_memory_rw_debug(first_cpu,
h->KdDebuggerDataBlock + KDBG_OWNER_TAG_OFFSET64,
(uint8_t *)&read_OwnerTag, sizeof(read_OwnerTag), 0)) {
error_setg(errp, "win-dump: failed to read OwnerTag");
return;
}
if (memcmp(read_OwnerTag, OwnerTag, sizeof(read_OwnerTag))) {
error_setg(errp, "win-dump: invalid KDBG OwnerTag,"
" expected '%.4s', got '%.4s',"
" KdDebuggerDataBlock seems to be encrypted",
OwnerTag, read_OwnerTag);
return;
}
}
void create_win_dump(DumpState *s, Error **errp)
{
WinDumpHeader64 *h = (WinDumpHeader64 *)(s->guest_note +
VMCOREINFO_ELF_NOTE_HDR_SIZE);
Error *local_err = NULL;
if (s->guest_note_size != sizeof(WinDumpHeader64) +
VMCOREINFO_ELF_NOTE_HDR_SIZE) {
error_setg(errp, "win-dump: invalid vmcoreinfo note size");
return;
}
check_header(h, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
check_kdbg(h, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
patch_header(h);
s->total_size = h->RequiredDumpSpace;
s->written_size = qemu_write_full(s->fd, h, sizeof(*h));
if (s->written_size != sizeof(*h)) {
error_setg(errp, QERR_IO_ERROR);
return;
}
write_runs(s, h, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}

87
win_dump.h Normal file
View file

@ -0,0 +1,87 @@
/*
* Windows crashdump
*
* Copyright (c) 2018 Virtuozzo International GmbH
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
typedef struct WinDumpPhyMemRun64 {
uint64_t BasePage;
uint64_t PageCount;
} QEMU_PACKED WinDumpPhyMemRun64;
typedef struct WinDumpPhyMemDesc64 {
uint32_t NumberOfRuns;
uint32_t unused;
uint64_t NumberOfPages;
WinDumpPhyMemRun64 Run[43];
} QEMU_PACKED WinDumpPhyMemDesc64;
typedef struct WinDumpExceptionRecord {
uint32_t ExceptionCode;
uint32_t ExceptionFlags;
uint64_t ExceptionRecord;
uint64_t ExceptionAddress;
uint32_t NumberParameters;
uint32_t unused;
uint64_t ExceptionInformation[15];
} QEMU_PACKED WinDumpExceptionRecord;
typedef struct WinDumpHeader64 {
char Signature[4];
char ValidDump[4];
uint32_t MajorVersion;
uint32_t MinorVersion;
uint64_t DirectoryTableBase;
uint64_t PfnDatabase;
uint64_t PsLoadedModuleList;
uint64_t PsActiveProcessHead;
uint32_t MachineImageType;
uint32_t NumberProcessors;
union {
struct {
uint32_t BugcheckCode;
uint32_t unused0;
uint64_t BugcheckParameter1;
uint64_t BugcheckParameter2;
uint64_t BugcheckParameter3;
uint64_t BugcheckParameter4;
};
uint8_t BugcheckData[40];
};
uint8_t VersionUser[32];
uint64_t KdDebuggerDataBlock;
union {
WinDumpPhyMemDesc64 PhysicalMemoryBlock;
uint8_t PhysicalMemoryBlockBuffer[704];
};
union {
uint8_t ContextBuffer[3000];
};
WinDumpExceptionRecord Exception;
uint32_t DumpType;
uint32_t unused1;
uint64_t RequiredDumpSpace;
uint64_t SystemTime;
char Comment[128];
uint64_t SystemUpTime;
uint32_t MiniDumpFields;
uint32_t SecondaryDataState;
uint32_t ProductType;
uint32_t SuiteMask;
uint32_t WriterStatus;
uint8_t unused2;
uint8_t KdSecondaryVersion;
uint8_t reserved[4018];
} QEMU_PACKED WinDumpHeader64;
void create_win_dump(DumpState *s, Error **errp);
#define KDBG_OWNER_TAG_OFFSET64 0x10
#define KDBG_KI_BUGCHECK_DATA_OFFSET64 0x88
#define KDBG_MM_PFN_DATABASE_OFFSET64 0xC0
#define VMCOREINFO_ELF_NOTE_HDR_SIZE 24