Summary of Changes:
1) Correction of PCI_CLASS from STORAGE_EXPRESS to MEMORY_CXL on init
2) Add CXL_CAPACITY_MULTIPLIER definition to replace magic numbers
3) Refactor CDAT DSMAS Initialization for multi-region initialization
4) Multi-Region and Volatile Memory support for CXL Type-3 Devices
5) Test and Documentation updates
Developed with input from Jonathan Cameron and Davidloh Bueso.
This series brings 2 features to CXL Type-3 Devices:
1) Volatile Memory Region support
2) Multi-Region support (1 Volatile, 1 Persistent)
In this series we implement multi-region and volatile region support
through 6 major changes to CXL devices
1) The HostMemoryBackend [hostmem] has been replaced by two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2) The single AddressSpace has been replaced by two AddressSpaces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
6) cxl-mailbox has been updated to report the respective size of
volatile and persistent memory regions
CXL Spec (3.0) Section 8.2.9.8.2.0 - Get Partition Info
Active Volatile Memory
The device shall provide this volatile capacity starting at DPA 0
Active Persistent Memory
The device shall provide this persistent capacity starting at the
DPA immediately following the volatile capacity
Partitioning of Persistent Memory regions may be supported on following
patch sets.
Submitted as an extention to the CDAT emulation because the CDAT DSMAS
entry concerns memory mapping and is required to successfully map memory
regions correctly in bios/efi.
Gregory Price (5):
hw/cxl: set cxl-type3 device type to PCI_CLASS_MEMORY_CXL
hw/cxl: Add CXL_CAPACITY_MULTIPLIER definition
hw/mem/cxl_type: Generalize CDATDsmas initialization for Memory
Regions
hw/cxl: Multi-Region CXL Type-3 Devices (Volatile and Persistent)
cxl: update tests and documentation for new cxl properties
docs/system/devices/cxl.rst | 53 ++++-
hw/cxl/cxl-mailbox-utils.c | 23 +-
hw/mem/cxl_type3.c | 449 +++++++++++++++++++++++-------------
include/hw/cxl/cxl_device.h | 11 +-
tests/qtest/cxl-test.c | 81 ++++++-
5 files changed, 416 insertions(+), 201 deletions(-)
--
2.37.3
