Re: [PATCH v7 00/12] Enabling DCD emulation support in Qemu

[fan <nifan.cxl@gmail.com>]

On Fri, Apr 19, 2024 at 02:24:36PM -0400, Gregory Price wrote:
> On Thu, Apr 18, 2024 at 04:10:51PM -0700, nifan.cxl@gmail.com wrote:
> > A git tree of this series can be found here (with one extra commit on top
> > for printing out accepted/pending extent list): 
> > https://github.com/moking/qemu/tree/dcd-v7
> > 
> > v6->v7:
> > 
> > 1. Fixed the dvsec range register issue mentioned in the the cover letter in v6.
> >    Only relevant bits are set to mark the device ready (Patch 6). (Jonathan)
> > 2. Moved the if statement in cxl_setup_memory from Patch 6 to Patch 4. (Jonathan)
> > 3. Used MIN instead of if statement to get record_count in Patch 7. (Jonathan)
> > 4. Added "Reviewed-by" tag to Patch 7.
> > 5. Modified cxl_dc_extent_release_dry_run so the updated extent list can be
> >    reused in cmd_dcd_release_dyn_cap to simplify the process in Patch 8. (Jørgen) 
> > 6. Added comments to indicate further "TODO" items in cmd_dcd_add_dyn_cap_rsp.
> >     (Jonathan)
> > 7. Avoided irrelevant code reformat in Patch 8. (Jonathan)
> > 8. Modified QMP interfaces for adding/releasing DC extents to allow passing
> >    tags, selection policy, flags in the interface. (Jonathan, Gregory)
> > 9. Redesigned the pending list so extents in the same requests are grouped
> >     together. A new data structure is introduced to represent "extent group"
> >     in pending list.  (Jonathan)
> > 10. Added support in QMP interface for "More" flag. 
> > 11. Check "Forced removal" flag for release request and not let it pass through.
> > 12. Removed the dynamic capacity log type from CxlEventLog definition in cxl.json
> >    to avoid the side effect it may introduce to inject error to DC event log.
> >    (Jonathan)
> > 13. Hard coded the event log type to dynamic capacity event log in QMP
> >     interfaces. (Jonathan)
> > 14. Adding space in between "-1]". (Jonathan)
> > 15. Some minor comment fixes.
> > 
> > The code is tested with similar setup and has passed similar tests as listed
> > in the cover letter of v5[1] and v6[2].
> > Also, the code is tested with the latest DCD kernel patchset[3].
> > 
> > [1] Qemu DCD patchset v5: https://lore.kernel.org/linux-cxl/20240304194331.1586191-1-nifan.cxl@gmail.com/T/#t
> > [2] Qemu DCD patchset v6: https://lore.kernel.org/linux-cxl/20240325190339.696686-1-nifan.cxl@gmail.com/T/#t
> > [3] DCD kernel patches: https://lore.kernel.org/linux-cxl/20240324-dcd-type2-upstream-v1-0-b7b00d623625@intel.com/T/#m11c571e21c4fe17c7d04ec5c2c7bc7cbf2cd07e3
> >
> 
> added review to all patches, will hopefully be able to add a Tested-by
> tag early next week, along with a v1 RFC for MHD bit-tracking.
> 
> We've been testing v5/v6 for a bit, so I expect as soon as we get the
> MHD code ported over to v7 i'll ship a tested-by tag pretty quick.
> 
> The super-set release will complicate a few things but this doesn't
> look like a blocker on our end, just a change to how we track bits in a
> shared bit/bytemap.
> 

Hi Gregory,
Thanks for reviewing the patches so quickly. 

No pressure, but look forward to your MHD work. :)

Fan

> > 
> > Fan Ni (12):
> >   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: Refactor ct3_build_cdat_entries_for_mr to take mr
> >     size instead of mr as argument
> >   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: Add superset extent release mailbox support
> >   hw/mem/cxl_type3: Allow to release extent superset in QMP interface
> > 
> >  hw/cxl/cxl-mailbox-utils.c  | 620 ++++++++++++++++++++++++++++++++++-
> >  hw/mem/cxl_type3.c          | 633 +++++++++++++++++++++++++++++++++---
> >  hw/mem/cxl_type3_stubs.c    |  20 ++
> >  include/hw/cxl/cxl_device.h |  81 ++++-
> >  include/hw/cxl/cxl_events.h |  18 +
> >  qapi/cxl.json               |  69 ++++
> >  6 files changed, 1396 insertions(+), 45 deletions(-)
> > 
> > -- 
> > 2.43.0
> >