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virtio, pc: fixes, cleanups

Browse source 
A bunch of fixes all over the place.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio, pc: fixes, cleanups

A bunch of fixes all over the place.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Thu 25 Jul 2019 16:19:33 BST
# gpg:                using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  virtio-balloon: free pbp more aggressively
  virtio-balloon: don't track subpages for the PBP
  virtio-balloon: Use temporary PBP only
  virtio-balloon: Rework pbp tracking data
  virtio-balloon: Better names for offset variables in inflate/deflate code
  virtio-balloon: Simplify deflate with pbp
  virtio-balloon: Fix QEMU crashes on pagesize > BALLOON_PAGE_SIZE
  virtio-balloon: Fix wrong sign extension of PFNs
  i386/acpi: show PCI Express bus on pxb-pcie expanders
  ioapic: kvm: Skip route updates for masked pins
  i386/acpi: fix gint overflow in crs_range_compare
  docs: clarify multiqueue vs multiple virtqueues

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2019-07-25 16:38:24 +01:00
commit 61c1e6a97d
5 changed files with 90 additions and 70 deletions
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17
docs/interop/vhost-user.rst
View file

@ -324,6 +324,15 @@ must support changing some configuration aspects on the fly.
Multiple queue support
----------------------
Many devices have a fixed number of virtqueues. In this case the master
already knows the number of available virtqueues without communicating with the
slave.
Some devices do not have a fixed number of virtqueues. Instead the maximum
number of virtqueues is chosen by the slave. The number can depend on host
resource availability or slave implementation details. Such devices are called
multiple queue devices.
Multiple queue support allows the slave to advertise the maximum number of
queues. This is treated as a protocol extension, hence the slave has to
implement protocol features first. The multiple queues feature is supported
@ -339,6 +348,14 @@ queue in the sent message to identify a specified queue.
The master enables queues by sending message ``VHOST_USER_SET_VRING_ENABLE``.
vhost-user-net has historically automatically enabled the first queue pair.
Slaves should always implement the ``VHOST_USER_PROTOCOL_F_MQ`` protocol
feature, even for devices with a fixed number of virtqueues, since it is simple
to implement and offers a degree of introspection.
Masters must not rely on the ``VHOST_USER_PROTOCOL_F_MQ`` protocol feature for
devices with a fixed number of virtqueues. Only true multiqueue devices
require this protocol feature.
Migration
---------