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Maxime Coquelin 1c3e5a2617 vhost-user: back SET/GET_CONFIG requests with a protocol feature 
Without a dedicated protocol feature, QEMU cannot know whether
the backend can handle VHOST_USER_SET_CONFIG and
VHOST_USER_GET_CONFIG messages.

This patch adds a protocol feature that is only advertised by
QEMU if the device implements the config ops. Vhost user init
fails if the device support the feature but the backend doesn't.

The backend should only send VHOST_USER_SLAVE_CONFIG_CHANGE_MSG
requests if the protocol feature has been negotiated.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Changpeng Liu <changpeng.liu@intel.com>
 		2018-04-09 17:35:46 +03:00
..
config docs: create config/, devel/ and spin/ subdirectories 2017-06-07 18:22:03 +02:00
devel virtio,vhost,pci,pc: features, cleanups 2018-03-20 15:48:34 +00:00
interop vhost-user: back SET/GET_CONFIG requests with a protocol feature 2018-04-09 17:35:46 +03:00
specs docs/vmcoreinfo: detail unsupported host format behaviour 2018-03-01 18:17:47 +02:00
spin docs: create config/, devel/ and spin/ subdirectories 2017-06-07 18:22:03 +02:00
COLO-FT.txt docs: fix COLO architecture diagram 2016-11-15 15:36:21 +08:00
amd-memory-encryption.txt target/i386: add Secure Encrypted Virtualization (SEV) object 2018-03-13 12:04:03 +01:00
block-replication.txt docs: block replication's description 2016-09-13 11:00:56 +01:00
bootindex.txt docs qemu-doc: Avoid ide-drive, it's deprecated 2017-06-04 18:42:55 +03:00
can.txt net/can: documentation 2018-02-13 11:44:13 +01:00
ccid.txt libcacard: improve documentation 2014-06-10 07:44:01 +02:00
colo-proxy.txt colo-compare: Update the COLO document to add the IOThread configuration 2017-09-08 09:34:40 +08:00
generic-loader.txt docs/generic-loader: Update the document 2016-10-17 19:22:16 +01:00
igd-assign.txt vfio/pci: Add IGD documentation 2016-05-26 11:12:05 -06:00
image-fuzzer.txt docs: List all image elements currently supported by the fuzzer 2014-09-22 11:39:35 +01:00
memory-hotplug.txt trivial: Add missing "-m" parameter in docs/memory-hotplug.txt 2017-09-26 09:11:22 +03:00
multi-thread-compression.txt docs/multi-thread-compression: Fix wrong command string 2016-06-07 18:19:24 +03:00
multiseat.txt maint: remove / fix many doubled words 2015-09-11 10:21:38 +03:00
nvdimm.txt nvdimm: add 'unarmed' option 2018-01-19 11:18:51 -02:00
pci_expander_bridge.txt pxb: cleanup 2016-03-11 16:59:12 +02:00
pcie.txt docs: pcie: Spell out machine type needs for PCIe features 2018-03-01 16:25:37 +02:00
pcie_pci_bridge.txt pci: removed the is_express field since a uniform interface was inserted 2018-02-08 21:06:41 +02:00
pr-manager.rst scsi: add multipath support to qemu-pr-helper 2017-09-22 21:07:27 +02:00
pvrdma.txt docs: add pvrdma device documentation. 2018-02-19 13:03:24 +02:00
qcow2-cache.txt docs: document how to use the l2-cache-entry-size parameter 2018-03-02 18:39:07 +01:00
qdev-device-use.txt pci-assign: Remove 2017-11-05 14:52:10 +01:00
qemu-block-drivers.texi docs: Document share-rw property more thoroughly 2018-02-13 12:27:17 +01:00
qemu_logo.pdf docs: add qemu logo to pdf 2017-01-16 10:11:43 +01:00
qemupciserial.inf Docs: Introduce multiport serial support in qemupciserial.inf. 2014-03-12 10:33:23 +01:00
rdma.txt Use HTTPS for qemu.org and other domains 2017-11-21 13:34:13 +00:00
replay.txt replay: update documentation 2018-03-12 17:10:38 +01:00
spice-port-fqdn.txt docs: add spice-port-fqdn.txt 2012-12-17 14:01:41 +01:00
throttle.txt docs: Fix description of the leaky bucket algorithm in throttle.txt 2016-09-13 18:12:34 +03:00
usb-storage.txt usb: Fix typo in documentation 2017-01-24 23:26:52 +03:00
usb2.txt docs: fix broken paths to docs/config/ich9-ehci-uhci.cfg 2017-07-31 13:12:55 +03:00
virtio-balloon-stats.txt docs: document virtio-balloon stats 2018-03-01 16:25:37 +02:00
xbzrle.txt docs/xbzrle: correction 2016-10-13 17:23:53 +02:00
xen-save-devices-state.txt Fix up dangling references to qmp-commands.* in comment and doc 2018-03-02 13:48:26 -06:00