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Lift max memory slots limit imposed by vhost-user

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Historically, sending all memory regions to vhost-user backends in a
single message imposed a limitation on the number of times memory
could be hot-added to a VM with a vhost-user device. Now that backends
which support the VHOST_USER_PROTOCOL_F_CONFIGURE_SLOTS send memory
regions individually, we no longer need to impose this limitation on
devices which support this feature.

With this change, VMs with a vhost-user device which supports the
VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS can support a configurable
number of memory slots, up to the maximum allowed by the target
platform.

Existing backends which do not support
VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS are unaffected.

Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: Peter Turschmid <peter.turschm@nutanix.com>
Suggested-by: Mike Cui <cui@nutanix.com>
Message-Id: <1588533678-23450-6-git-send-email-raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Raphael Norwitz 2020-05-21 05:00:40 +00:00 • committed by Michael S. Tsirkin
parent f1aeb14b08
commit 27598393a2
2 changed files with 40 additions and 23 deletions
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7
docs/interop/vhost-user.rst
View file

@ -1273,10 +1273,9 @@ Master message types
feature has been successfully negotiated, this message is submitted
by master to the slave. The slave should return the message with a
u64 payload containing the maximum number of memory slots for
QEMU to expose to the guest. At this point, the value returned
by the backend will be capped at the maximum number of ram slots
which can be supported by vhost-user. Currently that limit is set
at VHOST_USER_MAX_RAM_SLOTS = 8.
QEMU to expose to the guest. The value returned by the backend
will be capped at the maximum number of ram slots which can be
supported by the target platform.
``VHOST_USER_ADD_MEM_REG``
:id: 37