In particular, don't include it into headers.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
We create optional sections with this patch. But we already have
optional subsections. Instead of having two mechanism that do the
same, we can just generalize it.
For subsections we just change:
- Add a needed function to VMStateDescription
- Remove VMStateSubsection (after removal of the needed function
it is just a VMStateDescription)
- Adjust the whole tree, moving the needed function to the corresponding
VMStateDescription
Signed-off-by: Juan Quintela <quintela@redhat.com>
Most notably this includes virtio 1 patches
Still not all devices converted, and not fully spec compliant,
so disabled by default.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
pc, acpi, virtio
Most notably this includes virtio 1 patches
Still not all devices converted, and not fully spec compliant,
so disabled by default.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Thu Jun 11 12:53:08 2015 BST using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"
* remotes/mst/tags/for_upstream: (42 commits)
i386/acpi-build: fix PXB workarounds for unsupported BIOSes
i386/acpi-build: more traditional _UID and _HID for PXB root buses
vhost-scsi: move qdev properties into vhost-scsi.c
virtio-9p-device: move qdev properties into virtio-9p-device.c
virtio-serial-bus: move qdev properties into virtio-serial-bus.c
virtio-rng: move qdev properties into virtio-rng.c
virtio-scsi: move qdev properties into virtio-scsi.c
virtio-net.h: Remove unsed DEFINE_VIRTIO_NET_PROPERTIES
virtio-net: move qdev properties into virtio-net.c
virtio-input: emulated devices [pci]
virtio-input: core code & base class [pci]
pci: add PCI_CLASS_INPUT_*
virtio-pci: fill VirtIOPCIRegions early.
virtio-pci: drop identical virtio_pci_cap
virtio-pci: move cap type to VirtIOPCIRegion
virtio-pci: move virtio_pci_add_mem_cap call to virtio_pci_modern_region_map
virtio-pci: add virtio_pci_modern_region_map()
virtio-pci: add virtio_pci_modern_regions_init()
virtio-pci: add struct VirtIOPCIRegion for virtio-1 regions
virtio-balloon: switch to virtio_add_feature
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
As only one place in virtio-serial-bus.c uses
DEFINE_VIRTIO_SERIAL_PROPERTIES, there is no need to expose it. Inline
it into virtio-serial-bus.c to avoid wrongly use.
Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Disabling CONFIG_PARALLEL cause removing parallel_hds_isa_init defined in
parallel.c. This function is called during initialization of some boards so
disabling CONFIG_PARALLEL cause build failure.
This patch moves parallel_hds_isa_init to hw/isa/isa-bus.c so it is included
in case of disabled CONFIG_PARALLEL. Build is successful but qemu will abort
with "Unknown device" error when function is called.
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Message-Id: <1431509970-32154-1-git-send-email-mrezanin@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Make features 64bit wide everywhere.
On migration a full 64bit guest_features field is sent if one of the
high bits is set, in addition to the lower 32bit guest_features field
which must stay for compatibility reasons. That way we send the lower
32 feature bits twice, but the code is simpler because we don't have
to split and compose the 64bit features into two 32bit fields.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
VIRTIO_PCI_QUEUE_MAX is not only used for pci, so rename it be generic.
Cc: Amit Shah <amit.shah@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
When the virtio serial is writable, notify the chardev backend
with qemu_chr_accept_input().
Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Put the number of serial ports into a local variable in
multi_serial_pci_realize, then increment the port count
(pci->ports) as we initialize the serial port cores.
Now pci->ports always holds the number of successfully
initialized ports and we can use multi_serial_pci_exit
to properly cleanup the already initialized bits in case
of a init failure.
https://bugzilla.redhat.com/show_bug.cgi?id=970551
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Create a new header for Cadence UART to allow using the device with
modern SoC programming conventions. The state struct needs to be
visible to embed the device in SoC containers.
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 46a0fbd45b6b205f54c4a8c778deb75c77f8abdf.1431381507.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Clean up some variable names in preparation for migrating the state struct
and type cast macro to a public header. The acronym "UART" on it's own is
not specific enough to be used in a more global namespace so preface with
"cadence". Fix the capitalisation of "uart" in the state type while touching
the typename. Preface macros used by the state struct itself with CADENCE_UART
so they don't conflict in namespace either.
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 3812b7426c338beae9e082557f3524a99310ddc6.1431381507.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Sort the sclp consoles into the input category, just as virtio-serial.
Various other sclp devices don't have an obvious category, sort them
into misc.
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
There are a number of ffs(3) callers that do roughly:
bit = ffs(val);
if (bit) {
do_something(bit - 1);
}
This pattern can be converted to ctz32() like this:
zeroes = ctz32(val);
if (zeroes != 32) {
do_something(zeroes);
}
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-6-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Device models aren't supposed to go on fishing expeditions for
backends. They should expose suitable properties for the user to set.
For onboard devices, board code sets them.
A number of sysbus devices pick up block backends in their init() /
instance_init() methods with drive_get_next() instead: sl-nand,
milkymist-memcard, pl181, generic-sdhci.
Likewise, a number of sysbus devices pick up character backends in
their init() / realize() methods with qemu_char_get_next_serial():
cadence_uart, digic-uart, etraxfs,serial, lm32-juart, lm32-uart,
milkymist-uart, pl011, stm32f2xx-usart, xlnx.xps-uartlite.
All these mistakes are already marked FIXME. See the commit that
added these FIXMEs for a more detailed explanation of what's wrong.
Fortunately, only machines ppce500 and pseries-* support -device with
sysbus devices, and none of the devices above is supported with these
machines.
Set cannot_instantiate_with_device_add_yet to preserve our luck.
Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Character devices defined with -serial and -parallel are for board
initialization to wire up. Board code examines serial_hds[] and
parallel_hds[] to find them, and creates devices with their qdev
chardev properties set accordingly.
Except a few devices go on a fishing expedition for a suitable backend
instead of exposing a chardev property for board code to set: they use
serial_hds[] (often via qemu_char_get_next_serial()) or parallel_hds[]
in their realize() or init() method to connect to a backend.
Picking up backends that way works when the devices are created by
board code. But it's inappropriate for -device or device_add. Not
only is it inconsistent with how the other characrer device models
work (they connect to a backend explicitly identified by a "chardev"
property), it breaks when the backend has been picked up by the board
or a previous -device / device_add already.
Example:
$ qemu-system-ppc64 -M bamboo -S -device i82378 -device pc87312 -device pc87312
qemu-system-ppc64: -device pc87312: Property 'isa-parallel.chardev' can't take value 'parallel0', it's in use
Mark them with suitable FIXME comments.
Cc: Li Guang <lig.fnst@cn.fujitsu.com>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: "Andreas Färber" <andreas.faerber@web.de>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
commit 9b70c1790a
virtio-serial: switch to standard-headers
changes virtio_console_config size from 8 to 12 bytes:
it adds an optional 4 byte emerg_wr field.
As this crosses a power of two boundary, this changes the PCI BAR size,
which breaks migration compatibility with old qemu machine types.
It's probably a problem for other transports as well.
As a temporary fix, as we don't yet support this new field anyway,
simply make the config size smaller at init time.
Long terms we probably want something along the lines
of virtio_net_set_config_size.
Reported-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Cole Robinson <crobinso@redhat.com>
Users of virtio-serial may want to know when a port becomes writable. A
port can stop accepting writes if the guest port is open but not being
read from. In this case, data gets queued up in the virtqueue, and
after the vq is full, writes to the port do not succeed.
When the guest reads off a vq element, and adds a new one for the host
to put data in, we can tell users the port is available for more writes,
via the new ->guest_writable() callback.
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Use DeviceClass::realize() and TypeInfo::instance_init() instead of
the deprecated SysBusDevice::init().
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
* fix a bug in bitops.h
* implement SD card support on integratorcp
* add a missing 'compatible' property for Cortex-A57
* add Netduino 2 machine model
* fix command line parsing bug for CPU options with multiple CPUs
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Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20150311' into staging
target-arm queue:
* fix a bug in bitops.h
* implement SD card support on integratorcp
* add a missing 'compatible' property for Cortex-A57
* add Netduino 2 machine model
* fix command line parsing bug for CPU options with multiple CPUs
# gpg: Signature made Wed Mar 11 14:14:22 2015 GMT using RSA key ID 14360CDE
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>"
* remotes/pmaydell/tags/pull-target-arm-20150311:
bitops.h: sextract64() return type should be int64_t, not uint64_t
integrator/cp: Implement CARDIN and WPROT signals
integrator/cp: Model CP control registers as sysbus device
target-arm: Add missing compatible property to A57
netduino2: Add the Netduino 2 Machine
stm32f205: Add the stm32f205 SoC
stm32f2xx_SYSCFG: Add the stm32f2xx SYSCFG
stm32f2xx_USART: Add the stm32f2xx USART Controller
stm32f2xx_timer: Add the stm32f2xx Timer
hw/arm/virt: fix cmdline parsing bug with CPU options and smp > 1
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This patch adds the stm32f2xx USART controller
(UART also uses the same controller).
Signed-off-by: Alistair Francis <alistair@alistair23.me>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 762c6c0d2a41d574932bc4445ec9bfffe6da8798.1424175342.git.alistair@alistair23.me
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Commit d0a0bfe672 added checks for port
names, but didn't add a check to ensure port->name is non-NULL. This
results in a SIGSEGV when adding a port when one of the previously-added
ports didn't have the 'name' property set.
https://bugzilla.redhat.com/show_bug.cgi?id=1192775
Reported-by: vivian zhang <vivianzhang@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Bonus fix: always set an error on failure. Some failures were silent
before, except for the generic error set by device_realize().
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
A bunch of fixes all over the place.
All of ACPI refactoring has been merged.
Legacy pci commands have been dropped.
virtio header cleanup
initial patches from virtio-1.0 branch
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
pci, pc, virtio fixes and cleanups
A bunch of fixes all over the place.
All of ACPI refactoring has been merged.
Legacy pci commands have been dropped.
virtio header cleanup
initial patches from virtio-1.0 branch
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* remotes/mst/tags/for_upstream: (130 commits)
acpi: drop unused code
aml-build: comment fix
acpi-build: fix typo in comment
acpi: update generated files
vhost user:support vhost user nic for non msi guests
aml-build: fix build for glib < 2.22
acpi: update generated files
Makefile.target: binary depends on config-devices
acpi-test-data: update after pci rewrite
acpi, mem-hotplug: use PC_DIMM_SLOT_PROP in acpi_memory_plug_cb().
pci-hotplug-old: Has been dead for five major releases, bury
pci: Give a few helpers internal linkage
acpi: make build_*() routines static to aml-build.c
pc: acpi: remove not used anymore ssdt-[misc|pcihp].hex.generated blobs
pc: acpi-build: drop template patching and create PCI bus tree dynamically
tests: ACPI: update pc/SSDT.bridge due to new alg of PCI tree creation
pc: acpi-build: simplify PCI bus tree generation
tests: add ACPI blobs for qemu with bridge cases
tests: bios-tables-test: add support for testing bridges
tests: ACPI test blobs update due to PCI0._CRS changes
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Conflicts:
hw/pci/pci-hotplug-old.c
Add a helper function for checking whether a bit is set in the guest
features for a vdev as well as one that works on a feature bit set.
Convert code that open-coded this: It cleans up the code and makes it
easier to extend the guest feature bits.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Add virtio_{add,clear}_feature helper functions for manipulating a
feature bits variable. This has some benefits over open coding:
- add check that the bit is in a sane range
- make it obvious at a glance what is going on
- have a central point to change when we want to extend feature bits
Convert existing code manipulating features to use the new helpers.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
It shouldn't fail, and no caller checks for failure. Make failure
fatal.
Maintainers of affected machines cc'ed.
Cc: Anthony Liguori <aliguori@amazon.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Maintainers of affected machines cc'ed.
Cc: Anthony Liguori <aliguori@amazon.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
It shouldn't fail, and no caller checks for failure. Make failure
fatal.
Maintainers of affected machines cc'ed.
Cc: Richard Henderson <rth@twiddle.net>
Cc: Anthony Liguori <aliguori@amazon.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
It's the same old loop copied five times, plus another instance where
it's clipped to two iterations and unrolled.
No external users of serial_isa_init() are left, so give it internal
linkage.
Maintainers of affected machines cc'ed.
Cc: Richard Henderson <rth@twiddle.net>
Cc: Anthony Liguori <aliguori@amazon.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Warning from the Sparse static analysis tool:
hw/char/virtio-serial-bus.c:31:3:
warning: symbol 'vserdevices' was not declared. Should it be static?
Cc: Amit Shah <amit.shah@redhat.com>
Cc: Anthony Liguori <aliguori@amazon.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Warnings from the Sparse static analysis tool:
hw/char/serial.c:630:26: warning: symbol
'vmstate_serial_thr_ipending' was not declared. Should it be static?
hw/char/serial.c:646:26: warning: symbol
'vmstate_serial_tsr' was not declared. Should it be static?
hw/char/serial.c:665:26: warning: symbol
'vmstate_serial_recv_fifo' was not declared. Should it be static?
hw/char/serial.c:681:26: warning: symbol
'vmstate_serial_xmit_fifo' was not declared. Should it be static?
hw/char/serial.c:697:26: warning: symbol
'vmstate_serial_fifo_timeout_timer' was not declared. Should it be static?
hw/char/serial.c:713:26: warning: symbol
'vmstate_serial_timeout_ipending' was not declared. Should it be static?
hw/char/serial.c:729:26: warning: symbol
'vmstate_serial_poll' was not declared. Should it be static?
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Gibson.
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Merge remote-tracking branch 'remotes/amit/tags/for-2.3' into staging
Migration fix for virtio-serial devices on bi-endian targets by David
Gibson.
# gpg: Signature made Mon 05 Jan 2015 07:26:07 GMT using RSA key ID 854083B6
# gpg: Good signature from "Amit Shah <amit@amitshah.net>"
# gpg: aka "Amit Shah <amit@kernel.org>"
# gpg: aka "Amit Shah <amitshah@gmx.net>"
* remotes/amit/tags/for-2.3:
virtio-serial: Don't keep a persistent copy of config space
virtio_serial: Don't use vser->config.max_nr_ports internally
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The 'config' field in the VirtIOSerial structure keeps a copy of the virtio
console's config space as visible to the guest, that is to say, in guest
endianness. This is fiddly to maintain, because on some targets, such as
powerpc, the "guest endianness" can change when a new guest OS boots.
In fact, there's no need to maintain such a guest view of config space -
instead we can reconstruct it from host-format data when it is accessed
with get_config.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
A number of places in the virtio_serial driver retrieve the number of ports
from vser->config.max_nr_ports, which is guest-endian. But for internal
users, we already have a host-endian copy of the number of ports in
vser->serial.max_virtserial_ports. Using that instead of the config field
removes the need for easy-to-forget byteswapping.
In particular this fixes a bug on incoming migration, where we don't adjust
the endianness vser->config correctly, because it hasn't yet been loaded
from the migration stream when virtio_serial_load_device() is called.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
If the THR interrupt is disabled, there is no need to migrate thr_ipending
because LSR.THRE will be sampled again when the interrupt is enabled.
(This is the behavior that is not documented in the datasheet, but
relied on by Windows!)
Note that in this case IIR will never be 0x2 so, if thr_ipending were
to be one, QEMU would produce the subsection.
Reported-by: Igor Mammedov <imammedo@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
There is disagreement on whether LSR.THRE should be resampled when
IER.THRI goes from 1 to 1. Bochs only does it if IER.THRI goes from 0
to 1; PCE does it even if IER.THRI is unchanged. But the Windows driver
seems to always go from 1 to 0 and back to 1, so do things in agreement
with Bochs, because the handling of thr_ipending was reported in 2010
(https://lists.gnu.org/archive/html/qemu-devel/2010-03/msg01914.html)
as breaking DR-DOS Plus.
Reported-by: Roy Tam <roytam@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
When the transmit FIFO is emptied or enabled, the transmitter
hold register is empty. When it is disabled, it is also emptied and
in addition the previous contents of the transmitter hold register
are discarded. In either case, the THRE bit in LSR must be set and
THRI raised.
When the receive FIFO is emptied or enabled, the data ready and break
bits must be cleared in LSR. Likewise when the receive FIFO is disabled.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
- assert TEMT is cleared before sending a character; we'll get one from
TSR if tsr_retry > 0, from the FIFO or THR otherwise
- assert THRE cleared and FIFO not empty (if enabled) before fetching a
character to send. This effectively reverts dffacd46, but the check
makes no sense and commit f702e62 (serial: change retry logic to avoid
concurrency, 2014-07-11) must have made it unnecessary. The commit
message for f702e62 talks about multiple calls to qemu_chr_fe_add_watch
triggering s->tsr_retry >= MAX_XMIT_RETRY, but other failures were
possible. For example, if you have multiple calls, the subsequent ones
will see s->tsr_retry == 0 and will find THRE and/or TEMT on entry.
- for clarity, raise THRI immediately after the code sets THRE
- check THRE to see if another character has to be sent. This makes
the assertions more obvious and also means TEMT has to be set as soon as
the loop ends. It makes the loop send both TSR and THR if flow-control
happens in non-FIFO mode. Previously, THR would be lost.
- clear TEMT together with THRE even in the non-FIFO case
The last two items are bugfixes, but they were just found by inspection
and do not squash known bugs.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This is responsible for failure of migration from 2.2 to 2.1, because
thr_ipending is always one in practice.
serial.c is setting thr_ipending unconditionally. However, thr_ipending
is not used at all if THRI=0, and it will be overwritten again the next
time THRE or THRI changes. For that reason, we can set thr_ipending to
zero every time THRI is reset.
There is disagreement on whether LSR.THRE should be resampled when IER.THRI
goes from 1 to 1. This patch does not touch the code, leaving that for
QEMU 2.3+.
This has no semantic change and is enough to fix migration in the common
case where the interrupt is not pending or is reported in IIR. It does not
change the migration format, so 2.2.0 -> 2.1 will remain broken but we
can fix 2.2.1 -> 2.1 without breaking 2.2.1 <-> 2.2.0.
The case that remains broken (the one in which the subsection is strictly
necessary) is when THRE=1, the THRI interrupt has *not* been acknowledged
yet, and a higher-priority interrupt comes. In this case, you need the
subsection to tell the source that the lower-priority THRI interrupt is
pending. The subsection's breakage of migration, in this case, prevents
continuing the VM on the destination with an invalid state.
Cc: qemu-stable@nongnu.org
Reported-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
- instruction decoding and sparse warning in kvm
- overlong input and hangs in the sclp consoles
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Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20141105' into staging
Several bugfixes for s390x:
- instruction decoding and sparse warning in kvm
- overlong input and hangs in the sclp consoles
# gpg: Signature made Wed 05 Nov 2014 15:42:14 GMT using RSA key ID C6F02FAF
# gpg: Good signature from "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg: aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
* remotes/cohuck/tags/s390x-20141105:
s390x/sclpconsole: Avoid hanging SCLP ASCII console
s390x/sclpconsole-lm: Fix hanging SCLP line mode console
s390x/sclpconsole-lm: truncate input if line is too long
s390x/kvm: Fix warning from sparse
s390x/kvm: Fix opcode decoding for eb instruction handler
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
It seems "name" is not mandatory, and the following command line (based
on one generated by current libvirt) will crash qemu at start:
qemu-system-x86_64 \
-device virtio-serial-pci \
-device virtserialport,name=foo \
-device virtconsole
Program received signal SIGSEGV, Segmentation fault.
__strcmp_ssse3 () at ../sysdeps/x86_64/strcmp.S:210
210 movlpd (%rsi), %xmm2
Missing separate debuginfos, use: debuginfo-install
python-libs-2.7.5-13.fc20.x86_64
(gdb) bt
#0 __strcmp_ssse3 () at ../sysdeps/x86_64/strcmp.S:210
#1 0x000055555566bdc6 in find_port_by_name (name=0x0) at /home/elmarco/src/qemu/hw/char/virtio-serial-bus.c:67
Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
