mirror of
https://github.com/xemu-project/xemu.git
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016f5cf6ff
Usually the guest can tell the host to flush data to disk. In some cases we don't want to flush though, but try to keep everything in cache. So let's add a new cache value to -drive that allows us to set the cache policy to most aggressive, disabling flushes. We call this mode "unsafe", as guest data is not guaranteed to survive host crashes anymore. This patch also adds a noop function for aio, so we can do nothing in AIO fashion. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
539 lines
13 KiB
C
539 lines
13 KiB
C
#include "qemu-common.h"
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#include "qemu-error.h"
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#include "qemu-option.h"
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#include "qemu-config.h"
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#include "sysemu.h"
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#include "hw/qdev.h"
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QemuOptsList qemu_drive_opts = {
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.name = "drive",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
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.desc = {
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{
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.name = "bus",
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.type = QEMU_OPT_NUMBER,
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.help = "bus number",
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},{
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.name = "unit",
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.type = QEMU_OPT_NUMBER,
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.help = "unit number (i.e. lun for scsi)",
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},{
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.name = "if",
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.type = QEMU_OPT_STRING,
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.help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
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},{
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.name = "index",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "cyls",
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.type = QEMU_OPT_NUMBER,
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.help = "number of cylinders (ide disk geometry)",
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},{
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.name = "heads",
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.type = QEMU_OPT_NUMBER,
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.help = "number of heads (ide disk geometry)",
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},{
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.name = "secs",
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.type = QEMU_OPT_NUMBER,
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.help = "number of sectors (ide disk geometry)",
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},{
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.name = "trans",
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.type = QEMU_OPT_STRING,
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.help = "chs translation (auto, lba. none)",
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},{
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.name = "media",
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.type = QEMU_OPT_STRING,
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.help = "media type (disk, cdrom)",
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},{
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.name = "snapshot",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "file",
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.type = QEMU_OPT_STRING,
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.help = "disk image",
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},{
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.name = "cache",
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.type = QEMU_OPT_STRING,
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.help = "host cache usage (none, writeback, writethrough, unsafe)",
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},{
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.name = "aio",
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.type = QEMU_OPT_STRING,
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.help = "host AIO implementation (threads, native)",
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},{
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.name = "format",
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.type = QEMU_OPT_STRING,
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.help = "disk format (raw, qcow2, ...)",
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},{
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.name = "serial",
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.type = QEMU_OPT_STRING,
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},{
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.name = "rerror",
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.type = QEMU_OPT_STRING,
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},{
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.name = "werror",
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.type = QEMU_OPT_STRING,
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},{
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.name = "addr",
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.type = QEMU_OPT_STRING,
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.help = "pci address (virtio only)",
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},{
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.name = "readonly",
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.type = QEMU_OPT_BOOL,
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},
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{ /* end if list */ }
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},
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};
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QemuOptsList qemu_chardev_opts = {
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.name = "chardev",
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.implied_opt_name = "backend",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
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.desc = {
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{
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.name = "backend",
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.type = QEMU_OPT_STRING,
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},{
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.name = "path",
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.type = QEMU_OPT_STRING,
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},{
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.name = "host",
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.type = QEMU_OPT_STRING,
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},{
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.name = "port",
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.type = QEMU_OPT_STRING,
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},{
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.name = "localaddr",
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.type = QEMU_OPT_STRING,
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},{
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.name = "localport",
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.type = QEMU_OPT_STRING,
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},{
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.name = "to",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "ipv4",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "ipv6",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "wait",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "server",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "delay",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "telnet",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "width",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "height",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "cols",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "rows",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "mux",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "signal",
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.type = QEMU_OPT_BOOL,
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},
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{ /* end if list */ }
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},
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};
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#ifdef CONFIG_LINUX
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QemuOptsList qemu_fsdev_opts = {
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.name = "fsdev",
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.implied_opt_name = "fstype",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_fsdev_opts.head),
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.desc = {
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{
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.name = "fstype",
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.type = QEMU_OPT_STRING,
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}, {
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.name = "path",
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.type = QEMU_OPT_STRING,
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},
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{ /*End of list */ }
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},
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};
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#endif
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#ifdef CONFIG_LINUX
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QemuOptsList qemu_virtfs_opts = {
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.name = "virtfs",
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.implied_opt_name = "fstype",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_virtfs_opts.head),
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.desc = {
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{
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.name = "fstype",
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.type = QEMU_OPT_STRING,
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}, {
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.name = "path",
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.type = QEMU_OPT_STRING,
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}, {
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.name = "mount_tag",
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.type = QEMU_OPT_STRING,
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},
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{ /*End of list */ }
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},
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};
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#endif
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QemuOptsList qemu_device_opts = {
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.name = "device",
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.implied_opt_name = "driver",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
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.desc = {
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/*
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* no elements => accept any
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* sanity checking will happen later
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* when setting device properties
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*/
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{ /* end if list */ }
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},
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};
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QemuOptsList qemu_netdev_opts = {
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.name = "netdev",
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.implied_opt_name = "type",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
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.desc = {
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/*
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* no elements => accept any params
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* validation will happen later
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*/
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{ /* end of list */ }
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},
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};
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QemuOptsList qemu_net_opts = {
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.name = "net",
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.implied_opt_name = "type",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
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.desc = {
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/*
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* no elements => accept any params
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* validation will happen later
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*/
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{ /* end of list */ }
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},
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};
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QemuOptsList qemu_rtc_opts = {
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.name = "rtc",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_rtc_opts.head),
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.desc = {
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{
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.name = "base",
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.type = QEMU_OPT_STRING,
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},{
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.name = "clock",
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.type = QEMU_OPT_STRING,
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#ifdef TARGET_I386
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},{
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.name = "driftfix",
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.type = QEMU_OPT_STRING,
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#endif
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},
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{ /* end if list */ }
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},
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};
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QemuOptsList qemu_global_opts = {
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.name = "global",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
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.desc = {
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{
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.name = "driver",
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.type = QEMU_OPT_STRING,
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},{
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.name = "property",
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.type = QEMU_OPT_STRING,
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},{
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.name = "value",
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.type = QEMU_OPT_STRING,
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},
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{ /* end if list */ }
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},
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};
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QemuOptsList qemu_mon_opts = {
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.name = "mon",
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.implied_opt_name = "chardev",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
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.desc = {
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{
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.name = "mode",
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.type = QEMU_OPT_STRING,
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},{
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.name = "chardev",
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.type = QEMU_OPT_STRING,
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},{
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.name = "default",
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.type = QEMU_OPT_BOOL,
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},
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{ /* end if list */ }
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},
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};
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QemuOptsList qemu_cpudef_opts = {
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.name = "cpudef",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
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.desc = {
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{
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.name = "name",
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.type = QEMU_OPT_STRING,
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},{
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.name = "level",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "vendor",
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.type = QEMU_OPT_STRING,
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},{
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.name = "family",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "model",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "stepping",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "feature_edx", /* cpuid 0000_0001.edx */
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.type = QEMU_OPT_STRING,
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},{
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.name = "feature_ecx", /* cpuid 0000_0001.ecx */
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.type = QEMU_OPT_STRING,
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},{
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.name = "extfeature_edx", /* cpuid 8000_0001.edx */
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.type = QEMU_OPT_STRING,
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},{
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.name = "extfeature_ecx", /* cpuid 8000_0001.ecx */
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.type = QEMU_OPT_STRING,
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},{
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.name = "xlevel",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "model_id",
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.type = QEMU_OPT_STRING,
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},{
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.name = "vendor_override",
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.type = QEMU_OPT_NUMBER,
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList *vm_config_groups[] = {
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&qemu_drive_opts,
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&qemu_chardev_opts,
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&qemu_device_opts,
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&qemu_netdev_opts,
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&qemu_net_opts,
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&qemu_rtc_opts,
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&qemu_global_opts,
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&qemu_mon_opts,
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&qemu_cpudef_opts,
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NULL,
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};
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static QemuOptsList *find_list(QemuOptsList **lists, const char *group)
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{
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int i;
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for (i = 0; lists[i] != NULL; i++) {
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if (strcmp(lists[i]->name, group) == 0)
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break;
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}
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if (lists[i] == NULL) {
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error_report("there is no option group \"%s\"", group);
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}
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return lists[i];
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}
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QemuOptsList *qemu_find_opts(const char *group)
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{
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return find_list(vm_config_groups, group);
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}
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int qemu_set_option(const char *str)
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{
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char group[64], id[64], arg[64];
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QemuOptsList *list;
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QemuOpts *opts;
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int rc, offset;
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rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
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if (rc < 3 || str[offset] != '=') {
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error_report("can't parse: \"%s\"", str);
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return -1;
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}
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list = qemu_find_opts(group);
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if (list == NULL) {
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return -1;
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}
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opts = qemu_opts_find(list, id);
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if (!opts) {
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error_report("there is no %s \"%s\" defined",
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list->name, id);
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return -1;
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}
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if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
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return -1;
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}
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return 0;
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}
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int qemu_global_option(const char *str)
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{
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char driver[64], property[64];
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QemuOpts *opts;
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int rc, offset;
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rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
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if (rc < 2 || str[offset] != '=') {
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error_report("can't parse: \"%s\"", str);
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return -1;
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}
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opts = qemu_opts_create(&qemu_global_opts, NULL, 0);
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qemu_opt_set(opts, "driver", driver);
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qemu_opt_set(opts, "property", property);
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qemu_opt_set(opts, "value", str+offset+1);
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return 0;
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}
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struct ConfigWriteData {
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QemuOptsList *list;
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FILE *fp;
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};
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static int config_write_opt(const char *name, const char *value, void *opaque)
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{
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struct ConfigWriteData *data = opaque;
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fprintf(data->fp, " %s = \"%s\"\n", name, value);
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return 0;
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}
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static int config_write_opts(QemuOpts *opts, void *opaque)
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{
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struct ConfigWriteData *data = opaque;
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const char *id = qemu_opts_id(opts);
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if (id) {
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fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
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} else {
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fprintf(data->fp, "[%s]\n", data->list->name);
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}
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qemu_opt_foreach(opts, config_write_opt, data, 0);
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fprintf(data->fp, "\n");
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return 0;
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}
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void qemu_config_write(FILE *fp)
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{
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struct ConfigWriteData data = { .fp = fp };
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QemuOptsList **lists = vm_config_groups;
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int i;
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fprintf(fp, "# qemu config file\n\n");
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for (i = 0; lists[i] != NULL; i++) {
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data.list = lists[i];
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qemu_opts_foreach(data.list, config_write_opts, &data, 0);
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}
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}
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int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
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{
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char line[1024], group[64], id[64], arg[64], value[1024];
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Location loc;
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QemuOptsList *list = NULL;
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QemuOpts *opts = NULL;
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int res = -1, lno = 0;
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loc_push_none(&loc);
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while (fgets(line, sizeof(line), fp) != NULL) {
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loc_set_file(fname, ++lno);
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if (line[0] == '\n') {
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/* skip empty lines */
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continue;
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}
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if (line[0] == '#') {
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/* comment */
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continue;
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}
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if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
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/* group with id */
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list = find_list(lists, group);
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if (list == NULL)
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goto out;
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opts = qemu_opts_create(list, id, 1);
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continue;
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}
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if (sscanf(line, "[%63[^]]]", group) == 1) {
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/* group without id */
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list = find_list(lists, group);
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if (list == NULL)
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goto out;
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opts = qemu_opts_create(list, NULL, 0);
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continue;
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}
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if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
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/* arg = value */
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if (opts == NULL) {
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error_report("no group defined");
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goto out;
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}
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if (qemu_opt_set(opts, arg, value) != 0) {
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goto out;
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}
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continue;
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}
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error_report("parse error");
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goto out;
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}
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if (ferror(fp)) {
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error_report("error reading file");
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goto out;
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}
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res = 0;
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out:
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loc_pop(&loc);
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return res;
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}
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int qemu_read_config_file(const char *filename)
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{
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FILE *f = fopen(filename, "r");
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int ret;
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if (f == NULL) {
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return -errno;
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}
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ret = qemu_config_parse(f, vm_config_groups, filename);
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fclose(f);
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if (ret == 0) {
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return 0;
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} else {
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return -EINVAL;
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}
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}
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