motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2026-03-04 09:04:39 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

pc: fixes

Browse source 
This includes nvdimm persistence fixes queued before the release.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
 -----BEGIN PGP SIGNATURE-----
 
 iQEcBAABAgAGBQJbepoTAAoJECgfDbjSjVRpLioH/3BPps8FLh4x2gZSq3B+u72O
 RYUA3I3TilEGyc9yf8o7e1Hf+pQAJBEmulcnKxXFVWZIJ1GVLPt4NZCMQGiPDnJL
 +RCT/Q64PUy09hRjddAasikrvXa4YOsRgBgJJToO7v9PSQSaU3fC7O3hNea7KcF/
 C4SSqkUgxyDhCCYHHblpKxFz/wtwy4ZaCGSdozIdmKNPJ6/ye8wOQ1Mq9e1Mwp18
 S6ilJub5IwB6aM2KVMmX4AFomF4u2cn153ts8fI+Dyo4/NE6P4+viDlz3BOBKdzm
 kmd49h6/n4Lenoo4oI1yNHSuIJJTVfvnoLu6rG7mPbQKgxNd1uN4KuUIygU5PCY=
 =Xcaj
 -----END PGP SIGNATURE-----

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

pc: fixes

This includes nvdimm persistence fixes queued before the release.

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

# gpg: Signature made Mon 20 Aug 2018 11:38:11 BST
# gpg:                using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
# 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:
  migration/ram: ensure write persistence on loading all data to PMEM.
  migration/ram: Add check and info message to nvdimm post copy.
  mem/nvdimm: ensure write persistence to PMEM in label emulation
  hostmem-file: add the 'pmem' option
  configure: add libpmem support
  memory, exec: switch file ram allocation functions to 'flags' parameters
  memory, exec: Expose all memory block related flags.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-08-21 10:23:53 +01:00
commit 55f4e79d79
12 changed files with 235 additions and 36 deletions
Download patch file Download diff file Expand all files Collapse all files

22
docs/nvdimm.txt
View file

@ -173,3 +173,25 @@ There are currently two valid values for this option:
the NVDIMMs in the event of power loss. This implies that the
platform also supports flushing dirty data through the memory
controller on power loss.
If the vNVDIMM backend is in host persistent memory that can be accessed in
SNIA NVM Programming Model [1] (e.g., Intel NVDIMM), it's suggested to set
the 'pmem' option of memory-backend-file to 'on'. When 'pmem' is 'on' and QEMU
is built with libpmem [2] support (configured with --enable-libpmem), QEMU
will take necessary operations to guarantee the persistence of its own writes
to the vNVDIMM backend(e.g., in vNVDIMM label emulation and live migration).
If 'pmem' is 'on' while there is no libpmem support, qemu will exit and report
a "lack of libpmem support" message to ensure the persistence is available.
For example, if we want to ensure the persistence for some backend file,
use the QEMU command line:
-object memory-backend-file,id=nv_mem,mem-path=/XXX/yyy,size=4G,pmem=on
References
----------
[1] NVM Programming Model (NPM)
Version 1.2
https://www.snia.org/sites/default/files/technical_work/final/NVMProgrammingModel_v1.2.pdf
[2] Persistent Memory Development Kit (PMDK), formerly known as NVML project, home page:
http://pmem.io/pmdk/