Now we have the following behavior:

1) object_new() returns an object with ref = 1
2) object_initialize() does not increase the reference count (ref may be 0).
3) object_deref() will finalize the object when ref = 0.  it does not free the
   memory associated with the object.
4) both link and child properties correctly set the reference count.

The expected usage is the following:

1) child devices should generally be created via object_initialize() using
   memory from the parent device.  Adding the object as a child property will
   take ownership of the object and tie the child's life cycle to the parent.

2) If a child device is created via qdev_create() or some other form of
   object_new(), there must be an object_delete() call in the parent device's
   finalize function.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Links had limited utility before as they only allowed a concrete type to be
specified.  Now we can support abstract types and interfaces which means it's
now possible to have a link<PCIDevice>.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This is mostly code movement although not entirely.  This makes properties part
of the Object base class which means that we can now start using Object in a
meaningful way outside of qdev.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

I'm sure the intentions were good here, but there's no reason this should be in
qdev.  Move it to qemu-char where it belongs.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

qdev-monitor.c deals with the -device, device_add, and info qdm/qtree
interfaces.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Note that the FIXME gets fixed in series 4/4.  We need to convert BusState to
QOM before we can make parent_bus a link.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This gets us closer to being able to object_new() a qdev type and have a
functioning object verses having to call qdev_create().
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This adds a command that allows searching for types that implement a property.
This allows you to do things like search for all available PCIDevices.  In the
future, we'll also have a standard interface for things with a BlockDriverState
property that a PCIDevice could implement.

This will enable search queries like, "any type that implements the BlockDevice
interface" which would allow management tools to present available block devices
without having to hard code device names.  Since an object can implement
multiple interfaces, one device could act both as a BlockDevice and a
NetworkDevice.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Limit them to the device_add functionality.  Device aliases were a hack based
on the fact that virtio was modeled the wrong way.  The mechanism for aliasing
is very limited in that only one alias can exist for any device.

We have to support it for the purposes of compatibility but we only need to
support it in device_add so restrict it to that piece of code.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - Use a table for aliases (Paolo)

It is no longer used in the tree since everything is done natively through
QEMU Object Model.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This was done in a mostly automated fashion.  I did it in three steps and then
rebased it into a single step which avoids repeatedly touching every file in
the tree.

The first step was a sed-based addition of the parent type to the subclass
registration functions.

The second step was another sed-based removal of subclass registration functions
while also adding virtual functions from the base class into a class_init
function as appropriate.

Finally, a python script was used to convert the DeviceInfo structures and
qdev_register_subclass functions to TypeInfo structures, class_init functions,
and type_register_static calls.

We are almost fully converted to QOM after this commit.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Teach the various bits of code that need to walk through available devices to
do so via QOM.

Signed-off-by: Anthony Liguori

Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

As we use class_init to set class members, DeviceInfo no longer holds this
information.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This allows us to drop per-Device registration functions by allowing the
class_init functions to overload qdev methods.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Now DeviceInfo is no longer used after object construction.  All of the
relevant members have been moved to DeviceClass.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Introduce accessors and remove any code that directly accesses DeviceInfo
members.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Type registeration is going to get turned into a QOM call so decouple the
legacy support.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

We can probably model USBHidDevice as a base class to get even better code
sharing but for now, just use a common function to initialize the common class
members.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This file only contains code from Red Hat, so it can use GPLv2+.
Tested with `git blame -M -C net/checksum.c`.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

The most common use of -net tap is to connect a tap device to a bridge.  This
requires the use of a script and running qemu as root in order to allocate a
tap device to pass to the script.

This model is great for portability and flexibility but it's incredibly
difficult to eliminate the need to run qemu as root.  The only really viable
mechanism is to use tunctl to create a tap device, attach it to a bridge as
root, and then hand that tap device to qemu.  The problem with this mechanism
is that it requires administrator intervention whenever a user wants to create
a guest.

By essentially writing a helper that implements the most common qemu-ifup
script that can be safely given cap_net_admin, we can dramatically simplify
things for non-privileged users.  We still support existing -net tap options
as a mechanism for advanced users and backwards compatibility.

Currently, this is very Linux centric but there's really no reason why it
couldn't be extended for other Unixes.

A typical invocation would be similar to one of the following:

  qemu linux.img -net bridge -net nic,model=virtio

  qemu linux.img -net tap,helper="/usr/local/libexec/qemu-bridge-helper"
                 -net nic,model=virtio

  qemu linux.img -netdev bridge,id=hn0
                 -device virtio-net-pci,netdev=hn0,id=nic1

  qemu linux.img -netdev tap,helper="/usr/local/libexec/qemu-bridge-helper",id=hn0
                 -device virtio-net-pci,netdev=hn0,id=nic1

The default bridge that we attach to is br0.  The thinking is that a distro
could preconfigure such an interface to allow out-of-the-box bridged networking.

Alternatively, if a user wants to use a different bridge, a typical invocation
would be simliar to one of the following:

  qemu linux.img -net bridge,br=qemubr0 -net nic,model=virtio

  qemu linux.img -net tap,helper="/usr/local/libexec/qemu-bridge-helper --br=qemubr0"
                 -net nic,model=virtio

  qemu linux.img -netdev bridge,br=qemubr0,id=hn0
                 -device virtio-net-pci,netdev=hn0,id=nic1

  qemu linux.img -netdev tap,helper="/usr/local/libexec/qemu-bridge-helper --br=qemubr0",id=hn0
                 -device virtio-net-pci,netdev=hn0,id=nic1
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NRicha Marwaha <rmarwah@linux.vnet.ibm.com>
Signed-off-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

The ideal way to use qemu-bridge-helper is to give it an fscap of using:

 setcap cap_net_admin=ep qemu-bridge-helper

Unfortunately, most distros still do not have a mechanism to package files
with fscaps applied.  This means they'll have to SUID the qemu-bridge-helper
binary.

To improve security, use libcap to reduce our capability set to just
cap_net_admin, then reduce privileges down to the calling user.  This is
hopefully close to equivalent to fscap support from a security perspective.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NRicha Marwaha <rmarwah@linux.vnet.ibm.com>
Signed-off-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

We go to great lengths to restrict ourselves to just cap_net_admin as an OS
enforced security mechanism.  However, we further restrict what we allow users
to do to simply adding a tap device to a bridge interface by virtue of the fact
that this is the only functionality we expose.

This is not good enough though.  An administrator is likely to want to restrict
the bridges that an unprivileged user can access, in particular, to restrict
an unprivileged user from putting a guest on what should be isolated networks.

This patch implements an ACL mechanism that is enforced by qemu-bridge-helper.
The ACLs are fairly simple whitelist/blacklist mechanisms with a wildcard of
'all'.  All users are blacklisted by default, and deny takes precedence over
allow.

An interesting feature of this ACL mechanism is that you can include external
ACL files.  The main reason to support this is so that you can set different
file system permissions on those external ACL files.  This allows an
administrator to implement rather sophisticated ACL policies based on
user/group policies via the file system.

As an example:

/etc/qemu/bridge.conf root:qemu 0640

 allow br0
 include /etc/qemu/alice.conf
 include /etc/qemu/bob.conf
 include /etc/qemu/charlie.conf

/etc/qemu/alice.conf root:alice 0640
 allow br1

/etc/qemu/bob.conf root:bob 0640
 allow br2

/etc/qemu/charlie.conf root:charlie 0640
 deny all

This ACL pattern allows any user in the qemu group to get a tap device
connected to br0 (which is bridged to the physical network).

Users in the alice group can additionally get a tap device connected to br1.
This allows br1 to act as a private bridge for the alice group.

Users in the bob group can additionally get a tap device connected to br2.
This allows br2 to act as a private bridge for the bob group.

Users in the charlie group cannot get a tap device connected to any bridge.

Under no circumstance can the bob group get access to br1 or can the alice
group get access to br2.  And under no cicumstance can the charlie group
get access to any bridge.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NRicha Marwaha <rmarwah@linux.vnet.ibm.com>
Signed-off-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This patch adds a helper that can be used to create a tap device attached to
a bridge device.  Since this helper is minimal in what it does, it can be
given CAP_NET_ADMIN which allows qemu to avoid running as root while still
satisfying the majority of what users tend to want to do with tap devices.

The way this all works is that qemu launches this helper passing a bridge
name and the name of an inherited file descriptor.  The descriptor is one
end of a socketpair() of domain sockets.  This domain socket is used to
transmit a file descriptor of the opened tap device from the helper to qemu.

The helper can then exit and let qemu use the tap device.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NRicha Marwaha <rmarwah@linux.vnet.ibm.com>
Signed-off-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Bugfix after reboot when vmmouse was enabled and another OS which uses e.g. PS/2
mouse.

Details:
When a guest activated the vmmouse followed by a reboot the vmmouse was still
enabled and the PS/2 mouse was therefore unsusable. When another guest is then
booted without vmmouse support (e.g. PS/2 mouse) the mouse is not working.

Reason is that VMMouse has priority and disables all other mouse entities
and therefore must be disabled on reset.

Testscenario:
1.) Boot e.g. OS with VMMouse support (e.g. Windows with VMMouse tools)
2.) reboot
3.) Boot e.g. OS without VMMouse support (e.g. DOS) => PS/2 mouse doesn't work
     any more. Fixes that issue.

Testscenario 2 by Jan Kiszka <jan.kiszka@siemens.com>:
Confirm that this patch fixes a real issue. Setup: qemu.git,
opensuse 11.4 guest, SDL graphic, system_reset while guest is using the
vmmouse. Without the patch, the vmmouse become unusable after the
reboot. Also, the mouse stays in absolute mode even before X starts again.

Fixed by:
Disabling the vmmouse in its reset handler.
Tested-by: NAndreas F=E4rber <afaerber@suse.de>
Signed-off-by: NGerhard Wiesinger <lists@wiesinger.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

The lockf() call in qemu_create_pidfile() aims at ensuring mutual
exclusion. We shouldn't close the pidfile on success (as introduced by
commit 1bbd1592), because that drops the lock as well [1]:

    "File locks shall be released on first close by the locking process
    of any file descriptor for the file."

Coverity may complain again about the leaked file descriptor; let's
worry about that later.

v1->v2:
- add reference to 1bbd1592
- explain the intentional fd leak in the source

[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/lockf.htmlSigned-off-by: NLaszlo Ersek <lersek@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

In some cases initializing the alarm timers can lead to non-negligable
overhead from programs that link against qemu-tool.o. At least,
setting a max-resolution WinMM alarm timer via mm_start_timer() (the
current default for Windows) can increase the "tick rate" on Windows
OSs and affect frequency scaling, and in the case of tools that run
in guest OSs such has qemu-ga, the impact can be fairly dramatic
(+20%/20% user/sys time on a core 2 processor was observed from an idle
Windows XP guest).

This patch doesn't address the issue directly (not sure what a good
solution would be for Windows, or what other situations it might be
noticeable), but it at least limits the scope of the issue to programs
that "opt-in" to using the main-loop.c functions by only enabling alarm
timers when qemu_init_main_loop() is called, which is already required
to make use of those facilities, so existing users shouldn't be
affected.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

The __attribute__((constructor)) init_main_loop() automatically get
called if qemu-tool.o is linked in. On win32, this leads to
a qemu_notify_event() call which attempts to SetEvent() on a HANDLE that
won't be initialized until qemu_init_main_loop() is manually called,
breaking qemu-tools.o programs on Windows at runtime.

This patch checks for an initialized event handle before attempting to
set it, which is analoguous to how we deal with an unitialized
io_thread_fd in the posix implementation.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

The build process of optionroms spits out an "rm ..." line. Moreover, it
removes all .o files that can be handy for debugging purposes. So
disable automatic intermediate removal.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

There are scenarios on Linux with some SDL versions where
handle_activation is continuous invoked with state = SDL_APPINPUTFOCUS
and gain = 0 while we grabbed the input. This causes a ping-pong when we
grab the input after an absolute mouse entered the window.

As this sdl_grab_end was once introduced to work around a Windows-only
issue (0294ffb9), limit it to that platform.

CC: Erik Rull <erik.rull@rdsoftware.de>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

By grabbing the input already on button down, we leave the button in
that state for the host GUI. Thus it takes another click after releasing
the input again to synchronize the mouse button state.

Avoid this by grabbing on button up.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This reverts commit 6bb81603.

SDL_WM_GrabInput does not reliably bail out if grabbing is impossible.
So if we get here, we already lost and will block. But this can no
longer happen due to the check in sdl_grab_start. So this patch became
obsolete.

Conflicts:

	sdl.c
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Consistently check for SDL_APPINPUTFOCUS before trying to grab the input
focus. Just checking for SDL_APPACTIVE doesn't work. Moving the check to
sdl_grab_start allows for some consolidation.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

When the mouse mode changes to absolute while the SDL windows is not in
focus, refrain from grabbing the input. It would steal from some other
window.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

So far we overwrite the machine options completely with defaults if no
accel=value is provided. More user friendly is to fill in only
unspecified options. The new qemu_opts_set_defaults enables this.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Allow to configure the MC146818 RTC via the new lost tick policy
property and replace rtc_td_hack with this mechanism.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

This adds qemu_opts_set_defaults, an interface provide default values
for a QemuOpts set. Default options are parsed from a string and then
prepended to the list of existing options, or they serve as the sole
QemuOpts set.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Potentially tick-generating timer devices will gain a common property:
lock_tick_policy. It allows to encode 4 different ways how to deal with
tick events the guest did not process in time:

discard - ignore lost ticks (e.g. if the guest compensates for them
          already)
delay   - replay all lost ticks in a row once the guest accepts them
          again
merge   - if multiple ticks are lost, all of them are merged into one
          which is replayed once the guest accepts it again
slew    - lost ticks are gradually replayed at a higher frequency than
          the original tick

Not all timer device will need to support all modes. However, all need
to accept the configuration via this common property.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>