Created attachment 866151 [details]
guest xml with CXL controller/rootport/device added
Tumbleweed Guest: opensuse kernel 6.1.8
Tumbleweed Host: qemu-7.1.0-8.1.x86_64
Using simplest (first) CXL setup from:
https://www.qemu.org/docs/master/system/devices/cxl.html#example-command-lines
i.e. single host controller, single root port, one directly attached CXL Type 3
device.
The qemu arguments are added to libvirt xml manually. I am also attaching the
full libvirt xml for this domain.
Result: No CXL mem devices are seen in the guest
Expected result: One device is expected to be seen
cxl list -M
Warning: no matching devices found
[
]
Guest kernel booted with Booted with acpi.debug_layer=0xf
acpi.debug_level=0xffff
dmesg | grep -i cxl
[ 0.184343] uteval-0063 ut_evaluate_object : [CXLM._UID] was not found
[ 0.184345] uteval-0063 ut_evaluate_object : [CXLM._CID] was not found
[ 0.184347] uteval-0063 ut_evaluate_object : [CXLM._CLS] was not found
[ 0.184349] uteval-0063 ut_evaluate_object : [CXLM._ADR] was not found
[ 0.184351] uteval-0063 ut_evaluate_object : [CXLM._S0W] was not found
[ 0.184353] uteval-0063 ut_evaluate_object : [CXLM._S1W] was not found
[ 0.184354] uteval-0063 ut_evaluate_object : [CXLM._S2W] was not found
[ 0.184358] uteval-0063 ut_evaluate_object : [CXLM._S3W] was not found
[ 0.184360] uteval-0063 ut_evaluate_object : [CXLM._S4W] was not found
[ 0.184362] uteval-0063 ut_evaluate_object : [CXLM._S1D] was not found
[ 0.184363] uteval-0063 ut_evaluate_object : [CXLM._S2D] was not found
[ 0.184365] uteval-0063 ut_evaluate_object : [CXLM._S3D] was not found
[ 0.184367] uteval-0063 ut_evaluate_object : [CXLM._S4D] was not found
[ 0.416804] acpi ACPI0016:00: _OSC: OS supports [CXL11PortRegAccess
CXL20PortDevRegAccess CXLProtocolErrorReporting CXLNativeHot]
[ 0.416995] acpi ACPI0016:00: _OSC: OS now controls [CXLMemErrorReporting]
[ 0.894536] uteval-0063 ut_evaluate_object : [CXLM._CID] was not found
[ 33.648449] cxl_acpi: probe of ACPI0017:00 failed with error -22
-22 is EINVAL. It is likely that the missing ACPI object/method:
[CXLM._CID] was not found
is causing the error.
cat /boot/config-6.2.9-1-default | grep -i CXL
CONFIG_CXL_BUS=m
CONFIG_CXL_PCI=m
# CONFIG_CXL_MEM_RAW_COMMANDS is not set
CONFIG_CXL_ACPI=m
CONFIG_CXL_PMEM=m
CONFIG_CXL_MEM=m
CONFIG_CXL_PORT=m
CONFIG_CXL_SUSPEND=y
CONFIG_CXL_REGION=y
# CONFIG_CXL_REGION_INVALIDATION_TEST is not set
This is likely a qemu issue or a guest kernel issue.
I have not yet found an obviously missing patch (in qemu or kernel) regarding
the ACPI CXLM._CID object.
If someone can reproduce the issue, or conversely succeed in seeing the
emulated CXL mem device, please share.