shpc: unparent device before free

Recent core change removed unparent
so we need to do this in all callers now.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
rtl8139: honor RxOverflow flag in can_receive method

Some drivers (Linux' 8139too among them) rely on the NIC
injecting an interrupt in the event of a receive buffer overflow
and, accordingly, set the RxOverflow bit in the interrupt
mask. Unfortunately rtl8139's can_receive method ignores the
RxOverflow flag, which may lead to a situation where rtl8139
stops receiving packets (can_receive returns 0) when the receive
buffer becomes full.

If the driver eventually read from the receive buffer or reset
the card the emulator could recover from this situation. However
some implementations only do this upon receiving an interrupt
with either RxOK or RxOverflow set in the ISR; interrupt that
will never come because QEMU's flow control mechanisms would
prevent rtl8139 from receiving any packet.

Letting packets go through when the overflow interrupt is enabled
makes the QEMU emulator compliant to the spec and solves the
problem.

This patch should fix a relatively common (in our experience)
network stall observed when running enterprise distros with
rtl8139 as the NIC; in some cases the 8139too device driver gets
loaded and when under heavy load the network eventually stops
working.

Reported-by: Hayato Kakuta <kakuta.hayato@oss.ntt.co.jp>
Tested-by: Hayato Kakuta <kakuta.hayato@oss.ntt.co.jp>
Acked-by: Igor Kovalenko <igor.v.kovalenko@gmail.com>
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
ahci: Fix reset of MSI function

Call msi_reset on device reset as still required by the core.

CC: Alexander Graf <agraf@suse.de>
CC: qemu-stable@nongnu.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
intel-hda: Fix reset of MSI function

Call msi_reset on device reset as still required by the core.

CC: Gerd Hoffmann <kraxel@redhat.com>
CC: qemu-stable@nongnu.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
ahci: Clean up reset functions

Properly register reset functions via the device class.

CC: Alexander Graf <agraf@suse.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msi: Guard msi_reset with msi_present

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msi: Invoke msi/msix_reset from PCI core

There is no point in pushing this burden to the devices, they tend to
forget to call them (like intel-hda, ahci, xhci did). Instead, reset
functions are now called from pci_device_reset. They do nothing if
MSI/MSI-X is not in use.

CC: Alexander Graf <agraf@suse.de>
CC: Gerd Hoffmann <kraxel@redhat.com>
CC: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msi: Guard msi/msix_write_config with msi_present

Terminate msi/msix_write_config early if support is not enabled. This
allows to remove checks at the caller site if MSI is optional.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msi: Invoke msi/msix_write_config from PCI core

Also this functions is better invoked by the core than by each and every
device. This allows to drop the config_write callbacks from ich and
intel-hda.

CC: Alexander Graf <agraf@suse.de>
CC: Gerd Hoffmann <kraxel@redhat.com>
CC: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
msi: Use msi/msix_present more consistently

Replace some open-coded msi/msix_present checks.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
qdev: release parent properties on dc->init failure

While looking into hot-plugging bridges, I can create a qemu segfault via:

$ device_add pci-bridge

Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0.
**
ERROR:qom/object.c:389:object_delete: assertion failed: (obj->ref == 0)

I'm proposing to fix this by adding a call to 'object_unparent()', before the
call to qdev_free(). I see there is already a precedent for this usage pattern as
seen in qdev_simple_unplug_cb():

/* can be used as ->unplug() callback for the simple cases */
int qdev_simple_unplug_cb(DeviceState *dev)
{
    /* just zap it */
    object_unparent(OBJECT(dev));
    qdev_free(dev);
    return 0;
}

Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
pci_bridge_dev: fix error path in pci_bridge_dev_initfn()

Currently, we do not properly cleanup, if pci_bridge_dev_initfn
fails to initialize properly. Make sure to call pci_bridge_exitfn()
in the error path.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
monitor: Fix memory leak with readline completion

Each string which is shown during readline completion in the QEMU monitor
is allocated dynamically but currently never deallocated.

Add the missing loop which calls g_free for the allocated strings.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
configure: Fix build for some versions of glibc (9pfs)

Some versions declare open_by_handle_at, but don't define AT_EMPTY_PATH.
Extend the check in configure to test both preconditions.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Serge Hallyn <serge.hallyn@ubuntu.com>
dump: Fix license version (GPL2+ instead of GPL2)

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Fix some more license versions (GPL2+ instead of GPL2)

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
qcow2: remove a line of unnecessary code

Commit 3948d1d4 removed the pointer argument we filled in with l2_offset
but forgot to remove the unnecessary l2_offset assignment.

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
qcow2: fix endianness conversion

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
block: implement is_allocated for raw

Either FIEMAP, or SEEK_DATA+SEEK_HOLE can be used to implement the
is_allocated callback for raw files.  On Linux ext4, btrfs and XFS
all support it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
stream: tweak usage of bdrv_co_is_allocated

is_allocated_base has complex semantics that are not really usable
outside streaming.  Split the check in two parts, where the allocated
state for the top bs is moved to the caller.  The resulting function
is more generally useful.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>