[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v5 00/17] virtio-serial fixes, new abi for port disc
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PATCH v5 00/17] virtio-serial fixes, new abi for port discovery, flow control |
Date: |
Wed, 14 Apr 2010 10:58:20 +0530 |
Hello,
These patches rework the way ports are announced to the guests. A
control message is used to let the guest know a new port is
added. Initial port discovery and port hot-plug work via this way now.
This was done to have the host and guest port numbering in sync to
avoid surprises after several hotplug/unplug operations and
migrations.
The ability to assign a particular port number to ports is also added
so that management software can control the placement of ports.
This iteration fixes a few things Juan pointed out.
Juan and Gerd have already acked v4 of the patch series, from which it
remains largely unchanged.
Differences from v4:
- Juan: qemu_free() handles NULL fine
- Juan: Send ports_map as an array of u32s instead of as a buffer
(big/little endian issues)
- Juan: iov should be compiled only once (nothing target-specific)
- A few fixes from the other submission: discard piled up buffers in
the vq after port close or hot-unplug.
Overall:
- Users can set the port id they wish to instantiate ports at by using
the ,nr= parameter to 'virtserialport' and 'virtconsole' devices
- Migration fixes: refuse migration when:
- number of active ports is different between the src and destination
- max_nr_ports a device can support on the src is more
- If a qemu chardev connection to a port is closed on the dest while
it was open on the src, inform the guest about this. (Also do the
same for port closed on src but open on dest.)
- Use control messages for relaying new port information instead of
config space (changes abi)
- Propagate error message from guest in instantiating a port or a
device to the user.
- Handle scatter/gather for control output and data output from the
guest
- Fix abuse of virtio api in the virtqueue_push() function
- Add an API for the ports for flow control: ports can signal when
they're ready to accept data / stop sending data.
Amit Shah (17):
virtio-serial: save/load: Ensure target has enough ports
virtio-serial: save/load: Ensure nr_ports on src and dest are same.
virtio-serial: save/load: Ensure we have hot-plugged ports
instantiated
virtio-serial: save/load: Send target host connection status if
different
virtio-serial: Use control messages to notify guest of new ports
virtio-serial: whitespace: match surrounding code
virtio-serial: Remove redundant check for 0-sized write request
virtio-serial: Update copyright year to 2010
virtio-serial: Propagate errors in initialising ports / devices in
guest
virtio-serial: Send out guest data to ports only if port is opened
iov: Introduce a new file for helpers around iovs, add iov_from_buf()
iov: Add iov_to_buf and iov_size helpers
virtio-serial: Handle scatter-gather buffers for control messages
virtio-serial: Handle scatter/gather input from the guest
virtio-serial: Apps should consume all data that guest sends out /
Fix virtio api abuse
virtio-serial: Discard data that guest sends us when ports aren't
connected
virtio-serial: Implement flow control for individual ports
Makefile | 2 +
Makefile.objs | 1 +
hw/iov.c | 70 ++++++++++
hw/iov.h | 19 +++
hw/virtio-balloon.c | 35 +-----
hw/virtio-console.c | 11 +-
hw/virtio-net.c | 20 +---
hw/virtio-serial-bus.c | 333 ++++++++++++++++++++++++++++++++++++------------
hw/virtio-serial.h | 34 ++++--
9 files changed, 377 insertions(+), 148 deletions(-)
create mode 100644 hw/iov.c
create mode 100644 hw/iov.h
- [Qemu-devel] [PATCH v5 00/17] virtio-serial fixes, new abi for port discovery, flow control,
Amit Shah <=
- [Qemu-devel] [PATCH v5 01/17] virtio-serial: save/load: Ensure target has enough ports, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 02/17] virtio-serial: save/load: Ensure nr_ports on src and dest are same., Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 03/17] virtio-serial: save/load: Ensure we have hot-plugged ports instantiated, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 04/17] virtio-serial: save/load: Send target host connection status if different, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 05/17] virtio-serial: Use control messages to notify guest of new ports, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 06/17] virtio-serial: whitespace: match surrounding code, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 07/17] virtio-serial: Remove redundant check for 0-sized write request, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 08/17] virtio-serial: Update copyright year to 2010, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 09/17] virtio-serial: Propagate errors in initialising ports / devices in guest, Amit Shah, 2010/04/14
- [Qemu-devel] [PATCH v5 10/17] virtio-serial: Send out guest data to ports only if port is opened, Amit Shah, 2010/04/14