linux-kernel - kvm-unit-tests hang on Arm FVP with protected mode

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Message-ID: <CA+G9fYsT3b3Qd-m6tSDOgAXpgLPWz0QD_Z6a+_ff4oTecA85PQ@mail.gmail.com>
Date: Fri, 5 Sep 2025 17:58:45 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: kvmarm@...ts.linux.dev, Linux ARM <linux-arm-kernel@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>
Cc: Fuad Tabba <tabba@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Suzuki K Poulose <suzuki.poulose@....com>, Anders Roxell <anders.roxell@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>, Mark Brown <broonie@...nel.org>, 
	Aishwarya TCV <Aishwarya.TCV@....com>
Subject: kvm-unit-tests hang on Arm FVP with protected mode

kvm-unit-tests consistently hang on Arm FVP when booted with
kvm-arm.mode=protected across both 4K and 64K page-size kernel builds.

Running the same tests with kvm-arm.mode=vhe completes successfully.

Anders, bisected and identified the first bad commit as:

  066daa8d3bc2694c392e14091978043aed7b1f23
  KVM: arm64: Initialize HCRX_EL2 traps in pKVM

Regression Analysis:
- Reproducibility? yes

Test regression: kvm-unit-tests hang on Arm FVP with kvm-arm.mode=protected

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Environment:
Platform: Arm FVP base-revc
Kernel: arm64 (tested with 4K and 64K page sizes)
Mode: kvm-arm.mode=protected (hangs) vs kvm-arm.mode=vhe (passes)
Test suite: kvm-unit-tests (./run_tests.sh -a -t -v)
Cmdline args : kvm-arm.mode=protected
Kernel: Mainline master and Linux next master

Test run log:
INFO: running kvm unit tests ...
+ [ True = false ]
+ ./run_tests.sh -a -t -v
+ tee -a /lava-1/0/tests/0_kvm-unit-tests/automated/linux/kvm-unit-tests/output/result_log.txt
TAP version 13

Links:
https://regressions.linaro.org/lkft/linux-mainline-master/v6.17-rc4/lava/kvm-unit-tests/history/?page=1
https://qa-reports.linaro.org/api/testruns/29720932/log_file/

--
Linaro LKFT
https://lkft.linaro.org