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

[Fan Ni <fan.ni@samsung.com>]

On Mon, Jul 24, 2023 at 09:57:48AM +0100, Jonathan Cameron wrote:

Hi Ira & Jonathan,

Thanks for helping check. I resend the patch series and now they
look normal now. Although I am still not sure what happened to my
previous sending.

The resend is here:
https://lore.kernel.org/linux-cxl/20230724162313.34196-1-fan.ni@samsung.com/T/#t

Thanks,
Fan



> On Sat, 22 Jul 2023 21:52:06 -0700
> Ira Weiny <ira.weiny@intel.com> wrote:
> 
> > nifan@ wrote:
> > > From: Fan Ni <nifan@outlook.com>
> > > 
> > > The patch series provides dynamic capacity device (DCD) emulation in Qemu.  
> > 
> > I don't the patches on the list.
> > 
> > https://lore.kernel.org/all/SG2PR06MB33976BB3F9C47CBE08F02D09B23EA@SG2PR06MB3397.apcprd06.prod.outlook.com/
> > 
> > Did they get sent?
> Something odd going on...
> They are in https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg04105.html
> though threading is broken.
> Also seems to have made it to qemu-devel on lore
> https://lore.kernel.org/all/SG2PR06MB3397F3E74A083607F7492FA4B23EA@SG2PR06MB3397.apcprd06.prod.outlook.com/
> 
> Might be a backlog somewhere that will take a while to drain...
> 
> Fan, perhaps just resend the lot and make sure the threading works so we can find them more easily.
> 
> Jonathan
> 
> 
> > 
> > Ira
> > 
> > > 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 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
> > >   
> > 
> > 
> > 
> 
>