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

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Message-ID: <87ms79ystc.wl-maz@kernel.org>
Date: Fri, 05 Sep 2025 13:42:07 +0100
From: Marc Zyngier <maz@...nel.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: 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>,
	Fuad Tabba <tabba@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	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: Re: kvm-unit-tests hang on Arm FVP with protected mode

On Fri, 05 Sep 2025 13:28:45 +0100,
Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> 
> 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.

Do you realise that "kvm-arm.mode=vhe" is not a valid option?

> 
> 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

What do you expect us to do with such a non-report? Can you please, at
the very least, identify which test in that test suite triggers the
failure?

> Links:
> https://regressions.linaro.org/lkft/linux-mainline-master/v6.17-rc4/lava/kvm-unit-tests/history/?page=1

What is there? This link requires a login, and goes to 11 on the
scale of being useless.

	M.

-- 
Jazz isn't dead. It just smells funny.