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hw/cxl: Multi-Region CXL Type-3 Devices (Volatile and Persistent)

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This commit enables each CXL Type-3 device to contain one volatile
memory region and one persistent region.

Two new properties have been added to cxl-type3 device initialization:
    [volatile-memdev] and [persistent-memdev]

The existing [memdev] property has been deprecated and will default the
memory region to a persistent memory region (although a user may assign
the region to a ram or file backed region). It cannot be used in
combination with the new [persistent-memdev] property.

Partitioning volatile memory from persistent memory is not yet supported.

Volatile memory is mapped at DPA(0x0), while Persistent memory is mapped
at DPA(vmem->size), per CXL Spec 8.2.9.8.2.0 - Get Partition Info.

Signed-off-by: Gregory Price <gregory.price@memverge.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Tested-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-Id: <20230421160827.2227-4-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gregory Price 2023-04-21 17:08:27 +01:00 • committed by Michael S. Tsirkin
parent 3521176526
commit adacc814f5
7 changed files with 371 additions and 119 deletions
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11
include/hw/cxl/cxl_device.h
View file

@ -119,8 +119,10 @@ typedef struct cxl_device_state {
uint64_t host_set;
} timestamp;
/* memory region for persistent memory, HDM */
/* memory region size, HDM */
uint64_t mem_size;
uint64_t pmem_size;
uint64_t vmem_size;
} CXLDeviceState;
/* Initialize the register block for a device */
@ -245,12 +247,15 @@ struct CXLType3Dev {
PCIDevice parent_obj;
/* Properties */
HostMemoryBackend *hostmem;
HostMemoryBackend *hostmem; /* deprecated */
HostMemoryBackend *hostvmem;
HostMemoryBackend *hostpmem;
HostMemoryBackend *lsa;
uint64_t sn;
/* State */
AddressSpace hostmem_as;
AddressSpace hostvmem_as;
AddressSpace hostpmem_as;
CXLComponentState cxl_cstate;
CXLDeviceState cxl_dstate;