Re: [PATCH v2] arm64: dts: qcom: hamoa: Add remoteproc in EL2 device trees

[Birk Skyum]

Hi,

I reproduced this failure on a Lenovo Yoga Slim 7x (83ED), BIOS NHCN62WW,
using Arch Linux ARM kernel 7.2.4-1 and SLBounce. Boot stalled with repeated
SMMU faults, including FSR=0x402, SID=0x1000 and IOVA=0x86b020c0.

I then tested Jens Glathe's non-PAS EL2 overlay [1]. Keeping the kernel,
initramfs, boot arguments and SLBounce unchanged, removing the two
top-level ADSP/CDSP iommus properties allowed Linux to reach userspace and
initialize KVM.

Subsequent one- and two-vCPU Linux guests passed CPU and timer checks and
shut down cleanly across two cold boots. The host remained responsive, and
post-test kernel-log searches found no "Unhandled context fault" messages.

These were RAM-only tests, without GPU or remoteproc modules, so they
validate boot and basic KVM operation rather than full desktop or DSP
support.

[1] https://github.com/jglathe/linux_ms_dev_kit/commit/ce20a20db795f299983f092fb899e0ad1c005be3

Thanks,
Birk