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| author | Peter Maydell <peter.maydell@linaro.org> | 2021-07-09 17:58:38 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2021-07-09 17:58:38 +0100 |
| commit | ebd1f710029e9a5746541d80508d8ea9956b81fc (patch) | |
| tree | 7298c8ccac6f37146dd130dfd01d5428b8f87da2 /docs/system | |
| parent | 05de778b5b8ab0b402996769117b88c7ea5c7c61 (diff) | |
| parent | 53d1b5fcfb40c47da4c060dc913df0e9f62894bd (diff) | |
| download | qemu-ebd1f710029e9a5746541d80508d8ea9956b81fc.zip qemu-ebd1f710029e9a5746541d80508d8ea9956b81fc.tar.gz qemu-ebd1f710029e9a5746541d80508d8ea9956b81fc.tar.bz2 | |
Merge remote-tracking branch 'remotes/ehabkost-gl/tags/machine-next-pull-request' into staging
Machine queue, 2021-07-07
Deprecation:
* Deprecate pmem=on with non-DAX capable backend file
(Igor Mammedov)
Feature:
* virtio-mem: vfio support (David Hildenbrand)
Cleanup:
* vmbus: Don't make QOM property registration conditional
(Eduardo Habkost)
# gpg: Signature made Thu 08 Jul 2021 20:55:04 BST
# gpg: using RSA key 5A322FD5ABC4D3DBACCFD1AA2807936F984DC5A6
# gpg: issuer "ehabkost@redhat.com"
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full]
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF D1AA 2807 936F 984D C5A6
* remotes/ehabkost-gl/tags/machine-next-pull-request:
vfio: Disable only uncoordinated discards for VFIO_TYPE1 iommus
virtio-mem: Require only coordinated discards
softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types
softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require)
vfio: Support for RamDiscardManager in the vIOMMU case
vfio: Sanity check maximum number of DMA mappings with RamDiscardManager
vfio: Query and store the maximum number of possible DMA mappings
vfio: Support for RamDiscardManager in the !vIOMMU case
virtio-mem: Implement RamDiscardManager interface
virtio-mem: Don't report errors when ram_block_discard_range() fails
virtio-mem: Factor out traversing unplugged ranges
memory: Helpers to copy/free a MemoryRegionSection
memory: Introduce RamDiscardManager for RAM memory regions
Deprecate pmem=on with non-DAX capable backend file
vmbus: Don't make QOM property registration conditional
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs/system')
| -rw-r--r-- | docs/system/deprecated.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst index 70e08ba..94fb7db 100644 --- a/docs/system/deprecated.rst +++ b/docs/system/deprecated.rst @@ -221,6 +221,24 @@ This machine is deprecated because we have enough AST2500 based OpenPOWER machines. It can be easily replaced by the ``witherspoon-bmc`` or the ``romulus-bmc`` machines. +Backend options +--------------- + +Using non-persistent backing file with pmem=on (since 6.1) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +This option is used when ``memory-backend-file`` is consumed by emulated NVDIMM +device. However enabling ``memory-backend-file.pmem`` option, when backing file +is (a) not DAX capable or (b) not on a filesystem that support direct mapping +of persistent memory, is not safe and may lead to data loss or corruption in case +of host crash. +Options are: + + - modify VM configuration to set ``pmem=off`` to continue using fake NVDIMM + (without persistence guaranties) with backing file on non DAX storage + - move backing file to NVDIMM storage and keep ``pmem=on`` + (to have NVDIMM with persistence guaranties). + Device options -------------- |