[v5,0/3] hw/mem: CXL Type-3 Volatile Memory Support

Message

Jonathan Cameron April 21, 2023, 4:08 p.m. UTC

v5: Thanks to Michael Tsirkin for review
 - Use memory_region_size() instead of incorrect open coding.
   Add a precursor patch tidying up existing uses.

Depends on some of the fix series posted (mostly fuzz).
[PATCH 0/2]  hw/cxl: CDAT file handling fixes.
[PATCH v2 0/3] hw/cxl: Fix decoder commit and uncommit handlin
[PATCH 0/3] docs/cxl: Gathering of fixes for 8.0 CXL docs.

Based on: Message-ID: [e-mail]
Based on: Message-ID: [e-mail]
Based on: Message_ID: [e-mail]/

Now kernel support is in place, lets catch up with the emulation
of volatile memory on CXL type 3.

Original cover letter with minor updates.

This patches provides 2 features to the CXL Type-3 Device:
    1) Volatile Memory Region Support
    2) Multi-Region support (1 Volatile, 1 Persistent)

Summary of Changes per-commit:
1) Whitespace updates to docs and tests
2) Refactor CDAT DSMAS Initialization for multi-region initialization
   Multi-Region and Volatile Memory support for CXL Type-3 Devices
   Test and Documentation updates

The final patch in this series makes 6 major changes to the type-3
device in order to implement multi-region and volatile region support
    1) The HostMemoryBackend [hostmem] has been replaced by two
       [hostvmem] and [hostpmem] to store volatile and persistent memory
       respectively
    2) The single AddressSpace has been replaced by two AddressSpaces
       [hostvmem_as] and [hostpmem_as] to map respective memdevs.
    3) Each memory region size and total region are stored separately
    4) The CDAT and DVSEC memory map entries have been updated:
       a) if vmem is present, vmem is mapped at DPA(0)
       b) if pmem is present
          i)  and vmem is present, pmem is mapped at DPA(vmem->size)
          ii) else, pmem is mapped at DPA(0)
       c) partitioning of pmem is not supported in this patch set but
          has been discussed and this design should suffice.
    5) Read/Write functions have been updated to access AddressSpaces
       according to the mapping described in #4.  Access to the
       persistent address space is calculated by (dpa-vmem_len)
    6) cxl-mailbox has been updated to report the respective size of
       volatile and persistent memory region.

Gregory Price (2):
  tests/qtest/cxl-test: whitespace, line ending cleanup
  hw/cxl: Multi-Region CXL Type-3 Devices (Volatile and Persistent)

Jonathan Cameron (1):
  hw/mem: Use memory_region_size() in cxl_type3

 docs/about/deprecated.rst      |   8 +
 docs/system/devices/cxl.rst    |  49 ++++--
 hw/cxl/cxl-mailbox-utils.c     |  32 ++--
 hw/mem/cxl_type3.c             | 300 ++++++++++++++++++++++++---------
 include/hw/cxl/cxl_device.h    |  11 +-
 tests/qtest/bios-tables-test.c |   8 +-
 tests/qtest/cxl-test.c         | 146 +++++++++++-----
 7 files changed, 407 insertions(+), 147 deletions(-)