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qemu/qemu-config.c
Corey Bryant 587ed6be0b qemu-config: Add new -add-fd command line option 
This option can be used for passing file descriptors on the
command line.  It mirrors the existing add-fd QMP command which
allows an fd to be passed to QEMU via SCM_RIGHTS and added to an
fd set.

This can be combined with commands such as -drive to link file
descriptors in an fd set to a drive:

    qemu-kvm -add-fd fd=3,set=2,opaque="rdwr:/path/to/file"
             -add-fd fd=4,set=2,opaque="rdonly:/path/to/file"
             -drive file=/dev/fdset/2,index=0,media=disk

This example adds dups of fds 3 and 4, and the accompanying opaque
strings to the fd set with ID=2.  qemu_open() already knows how
to handle a filename of this format.  qemu_open() searches the
corresponding fd set for an fd and when it finds a match, QEMU
goes on to use a dup of that fd just like it would have used an
fd that it opened itself.

Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24 10:26:19 +02:00

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#include "qemu-common.h"
#include "qemu-error.h"
#include "qemu-option.h"
#include "qemu-config.h"
#include "hw/qdev.h"
#include "error.h"
static QemuOptsList qemu_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
.desc = {
{
.name = "bus",
.type = QEMU_OPT_NUMBER,
.help = "bus number",
},{
.name = "unit",
.type = QEMU_OPT_NUMBER,
.help = "unit number (i.e. lun for scsi)",
},{
.name = "if",
.type = QEMU_OPT_STRING,
.help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
},{
.name = "index",
.type = QEMU_OPT_NUMBER,
.help = "index number",
},{
.name = "cyls",
.type = QEMU_OPT_NUMBER,
.help = "number of cylinders (ide disk geometry)",
},{
.name = "heads",
.type = QEMU_OPT_NUMBER,
.help = "number of heads (ide disk geometry)",
},{
.name = "secs",
.type = QEMU_OPT_NUMBER,
.help = "number of sectors (ide disk geometry)",
},{
.name = "trans",
.type = QEMU_OPT_STRING,
.help = "chs translation (auto, lba. none)",
},{
.name = "media",
.type = QEMU_OPT_STRING,
.help = "media type (disk, cdrom)",
},{
.name = "snapshot",
.type = QEMU_OPT_BOOL,
.help = "enable/disable snapshot mode",
},{
.name = "file",
.type = QEMU_OPT_STRING,
.help = "disk image",
},{
.name = "cache",
.type = QEMU_OPT_STRING,
.help = "host cache usage (none, writeback, writethrough, "
"directsync, unsafe)",
},{
.name = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native)",
},{
.name = "format",
.type = QEMU_OPT_STRING,
.help = "disk format (raw, qcow2, ...)",
},{
.name = "serial",
.type = QEMU_OPT_STRING,
.help = "disk serial number",
},{
.name = "rerror",
.type = QEMU_OPT_STRING,
.help = "read error action",
},{
.name = "werror",
.type = QEMU_OPT_STRING,
.help = "write error action",
},{
.name = "addr",
.type = QEMU_OPT_STRING,
.help = "pci address (virtio only)",
},{
.name = "readonly",
.type = QEMU_OPT_BOOL,
.help = "open drive file as read-only",
},{
.name = "iops",
.type = QEMU_OPT_NUMBER,
.help = "limit total I/O operations per second",
},{
.name = "iops_rd",
.type = QEMU_OPT_NUMBER,
.help = "limit read operations per second",
},{
.name = "iops_wr",
.type = QEMU_OPT_NUMBER,
.help = "limit write operations per second",
},{
.name = "bps",
.type = QEMU_OPT_NUMBER,
.help = "limit total bytes per second",
},{
.name = "bps_rd",
.type = QEMU_OPT_NUMBER,
.help = "limit read bytes per second",
},{
.name = "bps_wr",
.type = QEMU_OPT_NUMBER,
.help = "limit write bytes per second",
},{
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_iscsi_opts = {
.name = "iscsi",
.head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
.desc = {
{
.name = "user",
.type = QEMU_OPT_STRING,
.help = "username for CHAP authentication to target",
},{
.name = "password",
.type = QEMU_OPT_STRING,
.help = "password for CHAP authentication to target",
},{
.name = "header-digest",
.type = QEMU_OPT_STRING,
.help = "HeaderDigest setting. "
"{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
},{
.name = "initiator-name",
.type = QEMU_OPT_STRING,
.help = "Initiator iqn name to use when connecting",
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_chardev_opts = {
.name = "chardev",
.implied_opt_name = "backend",
.head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
.desc = {
{
.name = "backend",
.type = QEMU_OPT_STRING,
},{
.name = "path",
.type = QEMU_OPT_STRING,
},{
.name = "host",
.type = QEMU_OPT_STRING,
},{
.name = "port",
.type = QEMU_OPT_STRING,
},{
.name = "localaddr",
.type = QEMU_OPT_STRING,
},{
.name = "localport",
.type = QEMU_OPT_STRING,
},{
.name = "to",
.type = QEMU_OPT_NUMBER,
},{
.name = "ipv4",
.type = QEMU_OPT_BOOL,
},{
.name = "ipv6",
.type = QEMU_OPT_BOOL,
},{
.name = "wait",
.type = QEMU_OPT_BOOL,
},{
.name = "server",
.type = QEMU_OPT_BOOL,
},{
.name = "delay",
.type = QEMU_OPT_BOOL,
},{
.name = "telnet",
.type = QEMU_OPT_BOOL,
},{
.name = "width",
.type = QEMU_OPT_NUMBER,
},{
.name = "height",
.type = QEMU_OPT_NUMBER,
},{
.name = "cols",
.type = QEMU_OPT_NUMBER,
},{
.name = "rows",
.type = QEMU_OPT_NUMBER,
},{
.name = "mux",
.type = QEMU_OPT_BOOL,
},{
.name = "signal",
.type = QEMU_OPT_BOOL,
},{
.name = "name",
.type = QEMU_OPT_STRING,
},{
.name = "debug",
.type = QEMU_OPT_NUMBER,
},
{ /* end of list */ }
},
};
QemuOptsList qemu_fsdev_opts = {
.name = "fsdev",
.implied_opt_name = "fsdriver",
.head = QTAILQ_HEAD_INITIALIZER(qemu_fsdev_opts.head),
.desc = {
{
.name = "fsdriver",
.type = QEMU_OPT_STRING,
}, {
.name = "path",
.type = QEMU_OPT_STRING,
}, {
.name = "security_model",
.type = QEMU_OPT_STRING,
}, {
.name = "writeout",
.type = QEMU_OPT_STRING,
}, {
.name = "readonly",
.type = QEMU_OPT_BOOL,
}, {
.name = "socket",
.type = QEMU_OPT_STRING,
}, {
.name = "sock_fd",
.type = QEMU_OPT_NUMBER,
},
{ /*End of list */ }
},
};
QemuOptsList qemu_virtfs_opts = {
.name = "virtfs",
.implied_opt_name = "fsdriver",
.head = QTAILQ_HEAD_INITIALIZER(qemu_virtfs_opts.head),
.desc = {
{
.name = "fsdriver",
.type = QEMU_OPT_STRING,
}, {
.name = "path",
.type = QEMU_OPT_STRING,
}, {
.name = "mount_tag",
.type = QEMU_OPT_STRING,
}, {
.name = "security_model",
.type = QEMU_OPT_STRING,
}, {
.name = "writeout",
.type = QEMU_OPT_STRING,
}, {
.name = "readonly",
.type = QEMU_OPT_BOOL,
}, {
.name = "socket",
.type = QEMU_OPT_STRING,
}, {
.name = "sock_fd",
.type = QEMU_OPT_NUMBER,
},
{ /*End of list */ }
},
};
static QemuOptsList qemu_device_opts = {
.name = "device",
.implied_opt_name = "driver",
.head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
.desc = {
/*
* no elements => accept any
* sanity checking will happen later
* when setting device properties
*/
{ /* end of list */ }
},
};
static QemuOptsList qemu_netdev_opts = {
.name = "netdev",
.implied_opt_name = "type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
.desc = {
/*
* no elements => accept any params
* validation will happen later
*/
{ /* end of list */ }
},
};
static QemuOptsList qemu_net_opts = {
.name = "net",
.implied_opt_name = "type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
.desc = {
/*
* no elements => accept any params
* validation will happen later
*/
{ /* end of list */ }
},
};
static QemuOptsList qemu_rtc_opts = {
.name = "rtc",
.head = QTAILQ_HEAD_INITIALIZER(qemu_rtc_opts.head),
.desc = {
{
.name = "base",
.type = QEMU_OPT_STRING,
},{
.name = "clock",
.type = QEMU_OPT_STRING,
},{
.name = "driftfix",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_global_opts = {
.name = "global",
.head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
.desc = {
{
.name = "driver",
.type = QEMU_OPT_STRING,
},{
.name = "property",
.type = QEMU_OPT_STRING,
},{
.name = "value",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
QemuOptsList qemu_sandbox_opts = {
.name = "sandbox",
.implied_opt_name = "enable",
.head = QTAILQ_HEAD_INITIALIZER(qemu_sandbox_opts.head),
.desc = {
{
.name = "enable",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_mon_opts = {
.name = "mon",
.implied_opt_name = "chardev",
.head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
.desc = {
{
.name = "mode",
.type = QEMU_OPT_STRING,
},{
.name = "chardev",
.type = QEMU_OPT_STRING,
},{
.name = "default",
.type = QEMU_OPT_BOOL,
},{
.name = "pretty",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_trace_opts = {
.name = "trace",
.implied_opt_name = "trace",
.head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
.desc = {
{
.name = "events",
.type = QEMU_OPT_STRING,
},{
.name = "file",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_cpudef_opts = {
.name = "cpudef",
.head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
.desc = {
{
.name = "name",
.type = QEMU_OPT_STRING,
},{
.name = "level",
.type = QEMU_OPT_NUMBER,
},{
.name = "vendor",
.type = QEMU_OPT_STRING,
},{
.name = "family",
.type = QEMU_OPT_NUMBER,
},{
.name = "model",
.type = QEMU_OPT_NUMBER,
},{
.name = "stepping",
.type = QEMU_OPT_NUMBER,
},{
.name = "feature_edx", /* cpuid 0000_0001.edx */
.type = QEMU_OPT_STRING,
},{
.name = "feature_ecx", /* cpuid 0000_0001.ecx */
.type = QEMU_OPT_STRING,
},{
.name = "extfeature_edx", /* cpuid 8000_0001.edx */
.type = QEMU_OPT_STRING,
},{
.name = "extfeature_ecx", /* cpuid 8000_0001.ecx */
.type = QEMU_OPT_STRING,
},{
.name = "xlevel",
.type = QEMU_OPT_NUMBER,
},{
.name = "model_id",
.type = QEMU_OPT_STRING,
},{
.name = "vendor_override",
.type = QEMU_OPT_NUMBER,
},
{ /* end of list */ }
},
};
QemuOptsList qemu_spice_opts = {
.name = "spice",
.head = QTAILQ_HEAD_INITIALIZER(qemu_spice_opts.head),
.desc = {
{
.name = "port",
.type = QEMU_OPT_NUMBER,
},{
.name = "tls-port",
.type = QEMU_OPT_NUMBER,
},{
.name = "addr",
.type = QEMU_OPT_STRING,
},{
.name = "ipv4",
.type = QEMU_OPT_BOOL,
},{
.name = "ipv6",
.type = QEMU_OPT_BOOL,
},{
.name = "password",
.type = QEMU_OPT_STRING,
},{
.name = "disable-ticketing",
.type = QEMU_OPT_BOOL,
},{
.name = "disable-copy-paste",
.type = QEMU_OPT_BOOL,
},{
.name = "sasl",
.type = QEMU_OPT_BOOL,
},{
.name = "x509-dir",
.type = QEMU_OPT_STRING,
},{
.name = "x509-key-file",
.type = QEMU_OPT_STRING,
},{
.name = "x509-key-password",
.type = QEMU_OPT_STRING,
},{
.name = "x509-cert-file",
.type = QEMU_OPT_STRING,
},{
.name = "x509-cacert-file",
.type = QEMU_OPT_STRING,
},{
.name = "x509-dh-key-file",
.type = QEMU_OPT_STRING,
},{
.name = "tls-ciphers",
.type = QEMU_OPT_STRING,
},{
.name = "tls-channel",
.type = QEMU_OPT_STRING,
},{
.name = "plaintext-channel",
.type = QEMU_OPT_STRING,
},{
.name = "image-compression",
.type = QEMU_OPT_STRING,
},{
.name = "jpeg-wan-compression",
.type = QEMU_OPT_STRING,
},{
.name = "zlib-glz-wan-compression",
.type = QEMU_OPT_STRING,
},{
.name = "streaming-video",
.type = QEMU_OPT_STRING,
},{
.name = "agent-mouse",
.type = QEMU_OPT_BOOL,
},{
.name = "playback-compression",
.type = QEMU_OPT_BOOL,
}, {
.name = "seamless-migration",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},
};
QemuOptsList qemu_option_rom_opts = {
.name = "option-rom",
.implied_opt_name = "romfile",
.head = QTAILQ_HEAD_INITIALIZER(qemu_option_rom_opts.head),
.desc = {
{
.name = "bootindex",
.type = QEMU_OPT_NUMBER,
}, {
.name = "romfile",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
static QemuOptsList qemu_machine_opts = {
.name = "machine",
.implied_opt_name = "type",
.merge_lists = true,
.head = QTAILQ_HEAD_INITIALIZER(qemu_machine_opts.head),
.desc = {
{
.name = "type",
.type = QEMU_OPT_STRING,
.help = "emulated machine"
}, {
.name = "accel",
.type = QEMU_OPT_STRING,
.help = "accelerator list",
}, {
.name = "kernel_irqchip",
.type = QEMU_OPT_BOOL,
.help = "use KVM in-kernel irqchip",
}, {
.name = "kvm_shadow_mem",
.type = QEMU_OPT_SIZE,
.help = "KVM shadow MMU size",
}, {
.name = "kernel",
.type = QEMU_OPT_STRING,
.help = "Linux kernel image file",
}, {
.name = "initrd",
.type = QEMU_OPT_STRING,
.help = "Linux initial ramdisk file",
}, {
.name = "append",
.type = QEMU_OPT_STRING,
.help = "Linux kernel command line",
}, {
.name = "dtb",
.type = QEMU_OPT_STRING,
.help = "Linux kernel device tree file",
}, {
.name = "dumpdtb",
.type = QEMU_OPT_STRING,
.help = "Dump current dtb to a file and quit",
}, {
.name = "phandle_start",
.type = QEMU_OPT_STRING,
.help = "The first phandle ID we may generate dynamically",
}, {
.name = "dt_compatible",
.type = QEMU_OPT_STRING,
.help = "Overrides the \"compatible\" property of the dt root node",
}, {
.name = "dump-guest-core",
.type = QEMU_OPT_BOOL,
.help = "Include guest memory in a core dump",
}, {
.name = "mem-merge",
.type = QEMU_OPT_BOOL,
.help = "enable/disable memory merge support",
},
{ /* End of list */ }
},
};
QemuOptsList qemu_boot_opts = {
.name = "boot-opts",
.head = QTAILQ_HEAD_INITIALIZER(qemu_boot_opts.head),
.desc = {
/* the three names below are not used now */
{
.name = "order",
.type = QEMU_OPT_STRING,
}, {
.name = "once",
.type = QEMU_OPT_STRING,
}, {
.name = "menu",
.type = QEMU_OPT_STRING,
/* following are really used */
}, {
.name = "splash",
.type = QEMU_OPT_STRING,
}, {
.name = "splash-time",
.type = QEMU_OPT_STRING,
}, {
.name = "reboot-timeout",
.type = QEMU_OPT_STRING,
},
{ /*End of list */ }
},
};
static QemuOptsList qemu_add_fd_opts = {
.name = "add-fd",
.head = QTAILQ_HEAD_INITIALIZER(qemu_add_fd_opts.head),
.desc = {
{
.name = "fd",
.type = QEMU_OPT_NUMBER,
.help = "file descriptor of which a duplicate is added to fd set",
},{
.name = "set",
.type = QEMU_OPT_NUMBER,
.help = "ID of the fd set to add fd to",
},{
.name = "opaque",
.type = QEMU_OPT_STRING,
.help = "free-form string used to describe fd",
},
{ /* end of list */ }
},
};
static QemuOptsList *vm_config_groups[32] = {
&qemu_drive_opts,
&qemu_chardev_opts,
&qemu_device_opts,
&qemu_netdev_opts,
&qemu_net_opts,
&qemu_rtc_opts,
&qemu_global_opts,
&qemu_mon_opts,
&qemu_cpudef_opts,
&qemu_trace_opts,
&qemu_option_rom_opts,
&qemu_machine_opts,
&qemu_boot_opts,
&qemu_iscsi_opts,
&qemu_sandbox_opts,
&qemu_add_fd_opts,
NULL,
};
static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
Error **errp)
{
int i;
for (i = 0; lists[i] != NULL; i++) {
if (strcmp(lists[i]->name, group) == 0)
break;
}
if (lists[i] == NULL) {
error_set(errp, QERR_INVALID_OPTION_GROUP, group);
}
return lists[i];
}
QemuOptsList *qemu_find_opts(const char *group)
{
QemuOptsList *ret;
Error *local_err = NULL;
ret = find_list(vm_config_groups, group, &local_err);
if (error_is_set(&local_err)) {
error_report("%s\n", error_get_pretty(local_err));
error_free(local_err);
}
return ret;
}
QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
{
return find_list(vm_config_groups, group, errp);
}
void qemu_add_opts(QemuOptsList *list)
{
int entries, i;
entries = ARRAY_SIZE(vm_config_groups);
entries--; /* keep list NULL terminated */
for (i = 0; i < entries; i++) {
if (vm_config_groups[i] == NULL) {
vm_config_groups[i] = list;
return;
}
}
fprintf(stderr, "ran out of space in vm_config_groups");
abort();
}
int qemu_set_option(const char *str)
{
char group[64], id[64], arg[64];
QemuOptsList *list;
QemuOpts *opts;
int rc, offset;
rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
if (rc < 3 || str[offset] != '=') {
error_report("can't parse: \"%s\"", str);
return -1;
}
list = qemu_find_opts(group);
if (list == NULL) {
return -1;
}
opts = qemu_opts_find(list, id);
if (!opts) {
error_report("there is no %s \"%s\" defined",
list->name, id);
return -1;
}
if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
return -1;
}
return 0;
}
int qemu_global_option(const char *str)
{
char driver[64], property[64];
QemuOpts *opts;
int rc, offset;
rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
if (rc < 2 || str[offset] != '=') {
error_report("can't parse: \"%s\"", str);
return -1;
}
opts = qemu_opts_create(&qemu_global_opts, NULL, 0, NULL);
qemu_opt_set(opts, "driver", driver);
qemu_opt_set(opts, "property", property);
qemu_opt_set(opts, "value", str+offset+1);
return 0;
}
struct ConfigWriteData {
QemuOptsList *list;
FILE *fp;
};
static int config_write_opt(const char *name, const char *value, void *opaque)
{
struct ConfigWriteData *data = opaque;
fprintf(data->fp, " %s = \"%s\"\n", name, value);
return 0;
}
static int config_write_opts(QemuOpts *opts, void *opaque)
{
struct ConfigWriteData *data = opaque;
const char *id = qemu_opts_id(opts);
if (id) {
fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
} else {
fprintf(data->fp, "[%s]\n", data->list->name);
}
qemu_opt_foreach(opts, config_write_opt, data, 0);
fprintf(data->fp, "\n");
return 0;
}
void qemu_config_write(FILE *fp)
{
struct ConfigWriteData data = { .fp = fp };
QemuOptsList **lists = vm_config_groups;
int i;
fprintf(fp, "# qemu config file\n\n");
for (i = 0; lists[i] != NULL; i++) {
data.list = lists[i];
qemu_opts_foreach(data.list, config_write_opts, &data, 0);
}
}
int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
{
char line[1024], group[64], id[64], arg[64], value[1024];
Location loc;
QemuOptsList *list = NULL;
Error *local_err = NULL;
QemuOpts *opts = NULL;
int res = -1, lno = 0;
loc_push_none(&loc);
while (fgets(line, sizeof(line), fp) != NULL) {
loc_set_file(fname, ++lno);
if (line[0] == '\n') {
/* skip empty lines */
continue;
}
if (line[0] == '#') {
/* comment */
continue;
}
if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
/* group with id */
list = find_list(lists, group, &local_err);
if (error_is_set(&local_err)) {
error_report("%s\n", error_get_pretty(local_err));
error_free(local_err);
goto out;
}
opts = qemu_opts_create(list, id, 1, NULL);
continue;
}
if (sscanf(line, "[%63[^]]]", group) == 1) {
/* group without id */
list = find_list(lists, group, &local_err);
if (error_is_set(&local_err)) {
error_report("%s\n", error_get_pretty(local_err));
error_free(local_err);
goto out;
}
opts = qemu_opts_create(list, NULL, 0, NULL);
continue;
}
if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
/* arg = value */
if (opts == NULL) {
error_report("no group defined");
goto out;
}
if (qemu_opt_set(opts, arg, value) != 0) {
goto out;
}
continue;
}
error_report("parse error");
goto out;
}
if (ferror(fp)) {
error_report("error reading file");
goto out;
}
res = 0;
out:
loc_pop(&loc);
return res;
}
int qemu_read_config_file(const char *filename)
{
FILE *f = fopen(filename, "r");
int ret;
if (f == NULL) {
return -errno;
}
ret = qemu_config_parse(f, vm_config_groups, filename);
fclose(f);
if (ret == 0) {
return 0;
} else {
return -EINVAL;
}
}
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