qemu/hw/mem
Ben Widawsky 947515fc42 hw/cxl/device: Implement MMIO HDM decoding (8.2.5.12)
A device's volatile and persistent memory are known Host Defined Memory
(HDM) regions. The mechanism by which the device is programmed to claim
the addresses associated with those regions is through dedicated logic
known as the HDM decoder. In order to allow the OS to properly program
the HDMs, the HDM decoders must be modeled.

There are two ways the HDM decoders can be implemented, the legacy
mechanism is through the PCIe DVSEC programming from CXL 1.1 (8.1.3.8),
and MMIO is found in 8.2.5.12 of the spec. For now, 8.1.3.8 is not
implemented.

Much of CXL device logic is implemented in cxl-utils. The HDM decoder
however is implemented directly by the device implementation.
Whilst the implementation currently does no validity checks on the
encoder set up, future work will add sanity checking specific to
the type of cxl component.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Co-developed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220429144110.25167-19-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2022-05-13 06:13:36 -04:00
..
cxl_type3.c hw/cxl/device: Implement MMIO HDM decoding (8.2.5.12) 2022-05-13 06:13:36 -04:00
Kconfig hw/cxl/device: Add a memory device (8.2.8.5) 2022-05-13 06:13:36 -04:00
memory-device.c qapi: More complex uses of QAPI_LIST_APPEND 2021-01-28 08:08:45 +01:00
meson.build hw/cxl/device: Add a memory device (8.2.8.5) 2022-05-13 06:13:36 -04:00
npcm7xx_mc.c hw/*: Use type casting for SysBusDevice in NPCM7XX 2021-01-12 21:19:02 +00:00
nvdimm.c Mark remaining global TypeInfo instances as const 2022-02-21 13:30:20 +00:00
pc-dimm.c Mark remaining global TypeInfo instances as const 2022-02-21 13:30:20 +00:00
sparse-mem.c Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
trace-events docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00