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| author | Gregory Price <gregory.price@memverge.com> | 2023-04-21 17:08:27 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-05-19 01:36:09 -0400 |
| commit | adacc814f541af9281c922e750d8ba4b90c1a73e (patch) | |
| tree | 3f1fe72a4b3a33e6e676a3badc44a4c050ffff67 /docs/about | |
| parent | 3521176526a901bd2a8418ce6470df0e38ca4e11 (diff) | |
| download | qemu-adacc814f541af9281c922e750d8ba4b90c1a73e.zip qemu-adacc814f541af9281c922e750d8ba4b90c1a73e.tar.gz qemu-adacc814f541af9281c922e750d8ba4b90c1a73e.tar.bz2 | |
hw/cxl: Multi-Region CXL Type-3 Devices (Volatile and Persistent)
This commit enables each CXL Type-3 device to contain one volatile
memory region and one persistent region.
Two new properties have been added to cxl-type3 device initialization:
[volatile-memdev] and [persistent-memdev]
The existing [memdev] property has been deprecated and will default the
memory region to a persistent memory region (although a user may assign
the region to a ram or file backed region). It cannot be used in
combination with the new [persistent-memdev] property.
Partitioning volatile memory from persistent memory is not yet supported.
Volatile memory is mapped at DPA(0x0), while Persistent memory is mapped
at DPA(vmem->size), per CXL Spec 8.2.9.8.2.0 - Get Partition Info.
Signed-off-by: Gregory Price <gregory.price@memverge.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Tested-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230421160827.2227-4-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'docs/about')
| -rw-r--r-- | docs/about/deprecated.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 7bb4d2f..e934e0a 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -328,6 +328,14 @@ from Intel that was not properly allocated. Since version 5.2, the controller has used a properly allocated identifier. Deprecate the ``use-intel-id`` machine compatibility parameter. +``-device cxl-type3,memdev=xxxx`` (since 8.0) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The ``cxl-type3`` device initially only used a single memory backend. With +the addition of volatile memory support, it is now necessary to distinguish +between persistent and volatile memory backends. As such, memdev is deprecated +in favor of persistent-memdev. + Block device options '''''''''''''''''''' |