linux-kernel - Re: [PATCH v4 09/18] KVM: arm64: Introduce __pkvm_vcpu

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Message-ID: <5b73e1ac-a48d-4064-a095-26cd9662f0c1@sirena.org.uk>
Date: Tue, 4 Feb 2025 14:32:19 +0000
From: Mark Brown <broonie@...nel.org>
To: Oliver Upton <oliver.upton@...ux.dev>
Cc: uJap072421@...ux.dev, Quentin Perret <qperret@...gle.com>,
	Marc Zyngier <maz@...nel.org>, Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Fuad Tabba <tabba@...gle.com>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	Sebastian Ene <sebastianene@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 09/18] KVM: arm64: Introduce __pkvm_vcpu_{load,put}()

On Mon, Feb 03, 2025 at 03:19:03PM -0800, Oliver Upton wrote:
> On Mon, Feb 03, 2025 at 07:50:44PM +0000, Mark Brown wrote:

> > Current mainline crashes when running the arch_timer_edge_cases selftest
> > in pKVM mode on a LibreTech Le Potato board, with a bisection pointing
> > at this change.  The system dies like this:
> > 
> > # selftests: kvm: arch_timer_edge_cases
> > [  130.599140] kvm [4518]: nVHE hyp panic at: [<ffff800081102b58>] __kvm_nvhe___vgic_v3_restore_vmcr_aprs+0x8/0x84!

> Thanks, fix posted here [*], although as a consequence this machine will
> stop running KVM in protected mode (which was never meant to work in the
> first place).

Yeah, I wasn't clear if this was something that was intended to work or
not - it's all in a constant state of flux.

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