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[PATCH v2 0/2] hw/mem: CXL Type-3 Volatile Memory Support
From: |
Jonathan Cameron |
Subject: |
[PATCH v2 0/2] hw/mem: CXL Type-3 Volatile Memory Support |
Date: |
Fri, 17 Feb 2023 17:56:55 +0000 |
v2:
- Fix an off by one in address space matching when both volatile and
persistent memory is in present (meant 1st byte of persistent memory
not readale)
- Picked up tags (thanks to all who tested!)
Based on following series (in order)
1. [PATCH v4 00/10] hw/cxl: CXL emulation cleanups and minor fixes for upstream
2. [PATCH v4 0/8] hw/cxl: RAS error emulation and injection
3. [PATCH 0/2] hw/cxl: Passthrough HDM decoder emulation
Based on: Message-Id: 20230206172816.8201-1-Jonathan.Cameron@huawei.com
Based-on: Message-id: 20230217172924.25239-1-Jonathan.Cameron@huawei.com
Based-on: Message-id: 20230125152703.9928-1-Jonathan.Cameron@huawei.com
Kernel code is queued up in kernel.org cxl/pending.
Now we have some kernel code to test this against (and it looks good)
I'd like to propose this series for upstream following 3 other series
already proposed for inclusion:
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1) The HostMemoryBackend [hostmem] has been replaced by two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2) The single AddressSpace has been replaced by two AddressSpaces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)
docs/system/devices/cxl.rst | 49 ++++--
hw/cxl/cxl-mailbox-utils.c | 26 +--
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 +++++++++++-----
6 files changed, 398 insertions(+), 142 deletions(-)
--
2.37.2
- [PATCH v2 0/2] hw/mem: CXL Type-3 Volatile Memory Support,
Jonathan Cameron <=