Re: [Qemu PATCH 0/9] Enabling DCD emulation support in Qemu

[Ira Weiny <ira.weiny@intel.com>]

nifan@ wrote:
> From: Fan Ni <nifan@outlook.com>
> 
> 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.
> 

Sorry I see them in this other thread now.

https://lore.kernel.org/all/SG2PR06MB3397F3E74A083607F7492FA4B23EA@SG2PR06MB3397.apcprd06.prod.outlook.com/

Thanks,
Ira

> 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 other issues mentioned in the comments (Jonathan&Nathan Fontenot).
> 8. Fixed the format issues 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(-)
> 
> -- 
> 2.39.2
>