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kceGetDeviceCaps (kernel_ce.c) copies the caps the client hands to UVM from
NV2080_CTRL_CMD_CE_GET_PHYSICAL_CAPS (0x20802a07), which reaches GSP-RM and
was answered with zeros. With capsTbl = {0,0} no CE had the SYSMEM bit, so
UVM's channel manager found no usable CE and UVM_REGISTER_GPU failed with
NV_ERR_NOT_SUPPORTED ("Failed to initialize the channel manager",
uvm_gpu.c:1574 - visible with uvm_debug_prints=1).
New handlers:
- CE_GET_PHYSICAL_CAPS (0x20802a07): {ceEngineType, capsTbl[2]} with
SYSMEM_READ|SYSMEM_WRITE|SYSMEM|P2P|BL_GT_64K (0xEC) for COPY0..COPY4,
NOT_SUPPORTED otherwise (matches subdeviceCtrlCmdCeGetCaps_IMPL).
- CE_GET_ALL_CAPS (0x20802a0a) / CE_GET_ALL_PHYSICAL_CAPS (0x20802a0b):
capsTbl[64][2] + present bitmap with the five CEs.
- CE_GET_CE_PCE_MASK (0x20802a02): pceMask = BIT(ceIdx) (one PCE per LCE).
Verified in-guest progress: UVM now gets past the channel manager and
creates channels; the register path's new blocker is the first channel
push (channel_init, uvm_channel.c:2535) whose semaphore release the
emulated GPU must complete ("Tracker entry ... stuck waiting for 90s",
sema VA 0x121000000 on channel 1:3 CE 0).
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The ptrace tracer resolves the current CUDA blocker: libcuda issues raw
syscall instructions, so LD_PRELOAD shims and ltrace see nothing; following
the child with PTRACE_SYSCALL + PTRACE_GET_SYSCALL_INFO does. It found
UVM_REGISTER_GPU (ioctl 0x25) returning rmStatus=0x56 NV_ERR_NOT_SUPPORTED,
with inputs identical to the working host run (rmCtrlFd=-1, hClient=0,
hSmcPartRef=0). Also dumps NV_ESC_RM_CONTROL cmd/status and RM alloc/free
statuses (all zero) and the UVM ioctl set (guest stops after
0x27,0x1,0x25,0x2 vs 141 ioctls on the host).
launch_qemu_rootport.sh is the working QEMU command line with the
pcie-root-port fix (see its header + the handoff PART 4); vmcycle.sh drives
the module/mdev/VM reload cycle around it.
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