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hw/nvme: change nvme-ns 'shared' default

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Change namespaces to be shared namespaces by default (parameter
shared=on). Keep shared=off for older machine types.

Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
This commit is contained in:
Klaus Jensen 2021-09-24 08:52:22 +02:00
parent 9fc6e86e8b
commit 916b0f0b52
3 changed files with 16 additions and 17 deletions
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24
docs/system/devices/nvme.rst
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@ -110,28 +110,32 @@ multipath I/O.
This will create an NVM subsystem with two controllers. Having controllers
linked to an ``nvme-subsys`` device allows additional ``nvme-ns`` parameters:
``shared`` (default: ``off``)
``shared`` (default: ``on`` since 6.2)
Specifies that the namespace will be attached to all controllers in the
subsystem. If set to ``off`` (the default), the namespace will remain a
private namespace and may only be attached to a single controller at a time.
subsystem. If set to ``off``, the namespace will remain a private namespace
and may only be attached to a single controller at a time. Shared namespaces
are always automatically attached to all controllers (also when controllers
are hotplugged).
``detached`` (default: ``off``)
If set to ``on``, the namespace will be be available in the subsystem, but
not attached to any controllers initially.
not attached to any controllers initially. A shared namespace with this set
to ``on`` will never be automatically attached to controllers.
Thus, adding
.. code-block:: console
-drive file=nvm-1.img,if=none,id=nvm-1
-device nvme-ns,drive=nvm-1,nsid=1,shared=on
-device nvme-ns,drive=nvm-1,nsid=1
-drive file=nvm-2.img,if=none,id=nvm-2
-device nvme-ns,drive=nvm-2,nsid=3,detached=on
-device nvme-ns,drive=nvm-2,nsid=3,shared=off,detached=on
will cause NSID 1 will be a shared namespace (due to ``shared=on``) that is
initially attached to both controllers. NSID 3 will be a private namespace
(i.e. only attachable to a single controller at a time) and will not be
attached to any controller initially (due to ``detached=on``).
will cause NSID 1 will be a shared namespace that is initially attached to both
controllers. NSID 3 will be a private namespace due to ``shared=off`` and only
attachable to a single controller at a time. Additionally it will not be
attached to any controller initially (due to ``detached=on``) or to hotplugged
controllers.
Optional Features
=================