Hi all,
This is v5 of the SPM (Specific Purpose Memory) patch. Thank you for
the feedback on v4.
Changes in v5:
- Renamed 'spm=on|off' to 'memmap-type=normal|spm|reserved' enum
(per Gregory's suggestion for better extensibility)
- Updated QAPI schema with new NumaMemmapType enum
- Updated documentation to describe SPM as a policy hint
(per Jonathan's feedback)
Use case:
This feature allows marking NUMA node memory as Specific Purpose Memory
(SPM) or reserved in the E820 table. SPM serves as a hint to the guest
that this memory might be managed by device drivers based on guest policy
Example usage:
-object memory-backend-ram,size=8G,id=m0
-object memory-backend-memfd,size=8G,id=m1
-numa node,nodeid=0,memdev=m0
-numa node,nodeid=1,memdev=m1,memmap-type=spm
Supported memmap-type values:
- normal: Regular system RAM (E820 type 1, default)
- spm: Specific Purpose Memory (E820 type 0xEFFFFFFF), a hint
that this memory might be managed by device drivers
- reserved: Reserved memory (E820 type 2), not usable as RAM
Please review. Thanks!
Best regards,
Jerry Huang
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2.34.1
