The USB network interface has a single buffer which the guest reads
from. This patch prevents multiple calls to usbnet_receive() from
clobbering the input buffer. Instead we queue packets until buffer
space becomes available again.
This is inspired by virtio-net and e1000 rxbuf handling.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit 190563f9a9)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
The USB network interface has two code paths depending on whether or not
RNDIS mode is enabled. Refactor usbnet_receive() so that there is a
common path throughout the function instead of duplicating everything
across if (is_rndis(s)) ... else ... code paths.
Clean up coding style and 80 character line wrap along the way.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit f237ddbb89)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This is reported by QA. When installing os with pxe, after the initial
kernel and initrd are loaded, the procedure tries to copy files from install
server to local harddisk, the network becomes stall because of running out of
receive descriptor.
[Whitespace fixes and removed qemu_notify_event() because Paolo's
earlier net patches have moved it into qemu_flush_queued_packets().
Additional info:
I can reproduce the network hang with a tap device doing a iPXE HTTP
boot as follows:
$ qemu -enable-kvm -m 1024 \
-netdev tap,id=netdev0,script=no,downscript=no \
-device i82559er,netdev=netdev0,romfile=80861209.rom \
-drive if=virtio,cache=none,file=test.img
iPXE> ifopen net0
iPXE> config # set static network configuration
iPXE> kernel http://mirror.bytemark.co.uk/fedora/linux/releases/17/Fedora/x86_64/os/images/pxeboot/vmlinuz
I needed a vanilla iPXE ROM to get to the iPXE prompt. I think the boot
prompt has been disabled in the ROMs that ship with QEMU to reduce boot
time.
During the vmlinuz HTTP download there is a network hang. hw/eepro100.c
has reached the end of the rx descriptor list. When the iPXE driver
replenishes the rx descriptor list we don't kick the QEMU net subsystem
and event loop, thereby leaving the tap netdev without its file
descriptor in select(2).
Stefan Hajnoczi <stefanha@gmail.com>]
Signed-off-by: Bo Yang <boyang@suse.com>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
(cherry picked from commit 1069985fb1)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
xen does not have a register that, when written, will cause can_receive
to go from false to true. However, flushing the queue can be attempted
whenever the front-end raises its side of the Xen event channel. There
is a single event channel for tx and rx.
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit a98b140223)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
When the guests replenish the receive ring buffer, the network device
should flush its queue of pending packets. This is done with
qemu_flush_queued_packets.
e1000's can_receive can go from false to true when RCTL or RDT are
modified.
Reported-by: Luigi Rizzo <rizzo@iet.unipi.it>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit e8b4c680b4)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
virtio-net has code to flush the queue and notify the iothread
whenever new receive buffers are added by the guest. That is
fine, and indeed we need to do the same in all other drivers.
However, notifying the iothread should be work for the network
subsystem. And since we are at it we can add a little smartness:
if some of the queued packets already could not be delivered,
there is no need to notify the iothread.
Reported-by: Luigi Rizzo <rizzo@iet.unipi.it>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit 987a9b4800)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
These wrong spellings were detected by codespell:
* successully -> successfully
* alot -> a lot
* wanna -> want to
* infomation -> information
* occured -> occurred
["also is" -> "is also" and "ressources" -> "resources" suggested by
Peter Maydell <peter.maydell@linaro.org>]
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit 0546b8c2f0)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
QEMU_PACKED results in a MinGW compiler warning when it is
used for single structure elements:
warning: 'gcc_struct' attribute ignored
Using QEMU_PACKED for the whole structure avoids the compiler warning
without changing the memory layout.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit 93d3ad2a80)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Don't queue up packets after a packet with the SPD (short packet detect)
flag set. Since we won't know if the packet will actually be short until it
has completed, and if it is short we should stop the queue.
This fixes a miniature photoframe emulating a USB cdrom with the windows
software for it not working.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 72a04d0c17)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Commit 93bfef4c6e makes qemu-devices
which report the qemu version string to the guest in some way use a
qemu_get_version function which reports a machine-specific version string.
However usb-redir does not expose the qemu version to the guest, only to
the usbredir-host as part of the initial handshake. This can then be logged
on the usbredir-host side for debugging purposes and is otherwise completely
unused! For debugging purposes it is important to have the real qemu version
in there, rather then the machine-specific version.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 35efba2cc6)
Conflicts:
hw/usb/redirect.c
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ceab6f9645)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
When removing unseen queue-heads from the async queue list, we should not
set the seen flag to 0, as this may cause them to be removed by
ehci_queues_rip_unused() during the next call to ehci_advance_async_state()
if the timer is late or running at a low frequency.
Note:
1) This *may* have caused the instant unlink / relinks described in commit
9bc3a3a216
2) Rather then putting more if-s inside ehci_queues_rip_unused, this patch
instead introduces a new ehci_queues_rip_unseen function.
3) This patch also makes it save to call ehci_queues_rip_unseen() multiple
times, which gets used in the folluw up patch titled:
"ehci: Walk async schedule before and after migration"
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 8f5457eb04)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Add two new trace events:
qxl_send_events(int qid, uint32_t events) "%d %d"
qxl_set_guest_bug(int qid) "%d"
Change qxl_io_unexpected_vga_mode parameters to be equivalent to those
of qxl_io_write for easier grouping under a single systemtap probe.
Change d to qxl in one place.
Signed-off-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 917ae08ca1)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
While testing q35, I found that windows 7 (specifically, windows 7 ultimate
with sp1 x64), wouldn't install because it can't find the cdrom or disk drive.
The failure message is: 'A required cd/dvd device driver is missing. If you
have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now.'
This can also be reproduced on piix by adding an ahci controller, and
observing that windows 7 does not see any devices behind it.
The problem is that when windows issues a HBA reset, qemu does not reset the
individual ports' PxCMD register. Windows 7 then reads back the PxCMD register
and presumably assumes that the ahci controller has already been initialized.
Windows then never sets up the PxIE register to enable interrupts, and thus it
never gets irqs back when it sends ata device inquiry commands.
This change brings qemu into ahci 1.3 specification compliance.
Section 10.4.3 HBA Reset:
"
When GHC.HR is set to '1', GHC.AE, GHC.IE, the IS register, and all port
register fields (except PxFB/PxFBU/PxCLB/PxCLBU) that are not HwInit in the
HBA's register memory space are reset.
"
I've also re-tested Fedora 16 and 17 to verify that they continue to work with
this change.
Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 2a4f4f34e6)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Report from smatch:
hw/ide/core.c:1472 ide_exec_cmd(423) error: buffer overflow 'smart_attributes' 8 <= 29
hw/ide/core.c:1474 ide_exec_cmd(425) error: buffer overflow 'smart_attributes' 8 <= 29
hw/ide/core.c:1475 ide_exec_cmd(426) error: buffer overflow 'smart_attributes' 8 <= 29
...
The upper limit of 30 was never reached because both for loops terminated
when 'smart_attributes' reached end of list, so there was no real buffer
overflow.
Nevertheless, changing the code not only fixes the error report, but also
reduces the size of smart_attributes and simplifies the for loops.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 1e53537fda)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
The Linux ehci isoc scheduling code fills the entire schedule ahead of
time minus 80 frames. If we make a large jump in where we are in the
schedule, ie 40 frames, then the scheduler all of a sudden will only have
40 frames left to work in, causing it to fail packet submissions
with error -27 (-EFBIG).
Changes in v2:
-Don't hardcode a maximum number of frames to process in one tick, instead:
-Process a minimum number of frames to ensure we do eventually catch up
-Stop (after the minimum number) when the guest has requested an irq
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 8f74ed1e43)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
If Interrupt Threshold Control is 8 or a multiple of 8, then
s->usbsts_frindex can become exactly 0x4000, at which point
(s->usbsts_frindex > s->frindex) will never become true, as
s->usbsts_frindex will not be lowered / reset in this case.
This patch fixes this.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ffa1f2e088)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Also register different memory regions for capabilities,
operational registers and port status registers. Create
separate tracepoints for operational regs and port status
regs. Ditch a bunch of sanity checks because the memory
core will do this for us now.
Offloading the byte, word and dword access handling to the
memory core also has the side effect of fixing ehci register
access on bigendian hosts.
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 3e4f910c8d)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Add back a call to qxl_spice_destroy_surface_wait_complete() in qxl_spice_destroy_surface_wait(),
that was removed by commit c480bb7da4
It is needed to complete surface-removal cleanup, for non async.
For async, qxl_spice_destroy_surface_wait_complete is called upon operation completion.
Signed-off-by: Uri Lublin <uril@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 753b8b0d77)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
xhci needs this for USB_REQ_SET_ADDRESS due to the way
usb addressing is handled by the xhci hardware.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 63587e3135)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Some guests need this according to
Alejandro Martinez Ruiz <alex@securiforest.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 6ee021d410)
Conflicts:
hw/usb/hcd-xhci.c
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This patch splits the xhci_xfer_data function into three.
The xhci_xfer_data function used to do does two things:
(1) copy transfer data between guest memory and a temporary buffer.
(2) report transfer results to the guest using events.
Now we three functions to handle this:
(1) xhci_xfer_map creates a scatter list for the transfer and
uses that (instead of the temporary buffer) to build a
USBPacket.
(2) xhci_xfer_unmap undoes the mapping.
(3) xhci_xfer_report sends out events.
The patch also fixes reporting of transaction errors which must be
reported unconditinally, not only in case the guest asks for it
using the ISP flag.
[ v2: fix warning ]
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit d5a15814b4)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
original xhci code (the one which used libusb directly) used to use
'background transfers' for iso streams. In upstream qemu the iso
stream buffering is handled by usb-host & usb-redir, so we will
never ever need this. It has been left in as reference, but is dead
code anyway. Rip it out.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 331e9406f1)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
usb-audio is a full speed (1.1) device,
but bcdUSB claims it is usb 2.0. Fix it.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 2bbd086c41)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Windows users need to know that they have to use the Baum driver to make
the qemu braille device work.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 2964cd9bfa)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Babble is the appropriate error in this case (rather then signalling a stall).
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 2979a36183)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit de550a6afb)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This is a preparation patch for completely getting rid of the async-packet
struct in usb-redir, instead relying on the (new) per ep queues in the
qemu usb core.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 206e7f20fe)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
The shadow copy only serves as an extra check (besides the packet-id) to
ensure the packet we get back is a reply to the packet we think it is.
This check has never triggered in all the time usb-redir is in use now,
and since the verified data in the returned packet-header is not used
otherwise, removing the check does not open any possibilities for the
usbredirhost to confuse us.
This is a preparation patch for completely getting rid of the async-packet
struct in usb-redir, instead relying on the (new) per ep queues in the
qemu usb core.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 104981d52b)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This is a preparation patch for completely getting rid of the async-packet
struct in usb-redir, instead relying on the (new) per ep queues in the
qemu usb core.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit cb897117cd)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
There is no need for this, and doing so means that a backend trying to
write immediately after an open event will see qemu_chr_be_can_write
returning 0, which not all backends handle well as there is no wakeup
mechanism to detect when the frontend does become writable.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ed9873bfbf)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
USB_RET_NAK is not a valid response for async handled packets (and will
trigger an assert as such).
Also drop the warning when receiving a status of cancelled for packets not
cancelled by qemu itself, this can happen when a device gets unredirected
by the usbredir-host while transfers are pending.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 181133404f)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Since my previous comment said "Should never happen", I tried changing the
next line to an assert(0), which did not go well, which as the new comments
explains is logical if you think about it for a moment.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit cf1f81691d)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
USB_RET_PROCERR can be triggered by the guest (by for example requesting more
then BUFFSIZE bytes), so don't assert on it.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit eff6dce79b)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Currently each time we try to execute a NAK-ed packet we redo
ehci_init_transfer, and usb_packet_map, re-allocing (without freeing) the
sg list every time.
This patch fixes this, it does this by introducing another async state, so
that we also properly cleanup a NAK-ed packet on cancel.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ef5b234477)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 3a8ca08e01)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
make qemu_queue_{cancel,reset} return the number of packets released,
so the caller can figure whenever there have been active packets even
though there shouldn't have been any. Add tracepoint to log this.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 5c514681ab)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Otherwise we'll see the packet free twice in the trace log even though
it actually happens only once.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 616789cde2)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reported packets which have completed before being cancelled as such to the
host. Note that the new code path this patch adds is untested since it I've
been unable to actually trigger the race which needs this code path.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 4b63a0df3b)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Update copyright headers to reflect all the work Gerd and I have been doing
on the EHCI emulation.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 522079dd44)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
-combine the qh check with the check for devaddr changes
-also ensure that p gets set to NULL when the queue gets cancelled on
devaddr change, which was not done properly before this patch
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit dafe31fc2a)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This reverts commit 9bc3a3a216, which got
added to fix an issue where the real, underlying cause was not stopping
the ep queue on an error.
Now that the underlying cause is fixed by the "usb: Halt ep queue and
cancel pending packets on a packet error" patch, the "don't flush" fix
is no longer needed.
Not only is it not needed, it causes us to see cancellations (unlinks)
done by the Linux EHCI driver too late, which in combination with the new
usb-core packet-id generation where qtd addresses are used as ids, causes
duplicate ids for in flight packets.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 66f092d256)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This can happen with usb-redir live-migration when the packet gets re-queued
after the migration and the original queuing from the migration source side
has already finished.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 9c1f67654a)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit c13a9e6136)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This way the hcd can re-use the same packet to retry without needing
to re-init it.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit cc40997489)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
If an (emulated) usb-device tries to write more data to a packet then
its iov len, this will trigger an assert in usb_packet_copy(), and if
a driver somehow circumvents that check and writes more data to the
iov then there is space, we have a much bigger problem then not correctly
reporting babble to the guest.
In practice babble will only happen with (real) redirected devices, and there
both the usb-host os and the qemu usb-device code already check for it.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 45b339b18c)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Stefan Hajnoczi