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[Qemu,RESEND,0/9] Enabling DCD emulation support in Qemu

Message ID 20230724162313.34196-1-fan.ni@samsung.com (mailing list archive)
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Series Enabling DCD emulation support in Qemu | expand

Message

Fan Ni July 24, 2023, 4:23 p.m. UTC 
The patch series provides dynamic capacity device (DCD) emulation in Qemu.
More specifically, it provides the following functionalities:
1. Extended type3 memory device to support DC regions and extents.
2. Implemented DCD related mailbox command support in CXL r3.0: 8.2.9.8.9.
3. ADD QMP interfaces for adding and releasing DC extents to simulate FM
functions for DCD described in cxl r3.0: 7.6.7.6.5 and 7.6.7.6.6.
4. Add new ct3d properties for DCD devices (host backend, number of dc
regions, etc.)
5. Add read/write support from/to DC regions of the device.
6. Add mechanism to validate accessed to DC region address space.

A more detailed description can be found from the previously posted RFC[1].

Compared to the previously posted RFC[1], following changes have been made:
1. Rebased the code on top of Jonathan's branch
https://gitlab.com/jic23/qemu/-/tree/cxl-2023-05-25.
2. Extracted the rename of mem_size to a separated patch.(Jonathan)
3. Reordered the patch series to improve its readability.(Jonathan)
4. Split the validation of accesses to DC region address space as a separate
patch.
5. Redesigned the QMP interfaces for adding and releasing DC extents to make
them easier to understand and act like existing QMP interfaces (like the
interface for cxl-inject-uncorrectable-errors). (Jonathan)
6. Updated dvsec range register setting to support DCD devices without static
capacity.
7. Fixed issues mentioned in the comments (Jonathan&Nathan Fontenot).
8. Fixed the format issue and checked with checkpatch.pl under qemu code dir.


The code is tested with the DCD patch series at the kernel side[2]. The test
is similar to those mentioned in the cover letter of [1].


[1]: https://lore.kernel.org/all/20230511175609.2091136-1-fan.ni@samsung.com/
[2]: https://lore.kernel.org/linux-cxl/649da378c28a3_968bb29420@iweiny-mobl.notmuch/T/#t

Fan Ni (9):
  hw/cxl/cxl-mailbox-utils: Add dc_event_log_size field to output
    payload of identify memory device command
  hw/cxl/cxl-mailbox-utils: Add dynamic capacity region representative
    and mailbox command support
  include/hw/cxl/cxl_device: Rename mem_size as static_mem_size for
    type3 memory devices
  hw/mem/cxl_type3: Add support to create DC regions to type3 memory
    devices
  hw/mem/cxl_type3: Add host backend and address space handling for DC
    regions
  hw/mem/cxl_type3: Add DC extent list representative and get DC extent
    list mailbox support
  hw/cxl/cxl-mailbox-utils: Add mailbox commands to support add/release
    dynamic capacity response
  hw/cxl/events: Add qmp interfaces to add/release dynamic capacity
    extents
  hw/mem/cxl_type3: Add dpa range validation for accesses to dc regions

 hw/cxl/cxl-mailbox-utils.c  | 421 +++++++++++++++++++++++++++-
 hw/mem/cxl_type3.c          | 539 +++++++++++++++++++++++++++++++++---
 hw/mem/cxl_type3_stubs.c    |   6 +
 include/hw/cxl/cxl_device.h |  49 +++-
 include/hw/cxl/cxl_events.h |  16 ++
 qapi/cxl.json               |  49 ++++
 6 files changed, 1034 insertions(+), 46 deletions(-)