linux-kernel - Re: [PATCH 0/4] KVM: arm64: Fix CPU resume/on with pKVM

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Date:   Mon,  6 Feb 2023 17:12:59 +0000
From:   Oliver Upton <oliver.upton@...ux.dev>
To:     Marc Zyngier <maz@...nel.org>, Mark Brown <broonie@...nel.org>,
        Will Deacon <will@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Quentin Perret <qperret@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>
Cc:     Oliver Upton <oliver.upton@...ux.dev>, kvmarm@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, kernel-team@...roid.com,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] KVM: arm64: Fix CPU resume/on with pKVM

On Wed, 1 Feb 2023 10:37:50 +0000, Quentin Perret wrote:
> When using pKVM, we do not reset the EL2 exception vectors back to the
> stubs for e.g. Power Management or CPU hotplug as we normally do in KVM.
> As consequence, the initialisation perfomed by __finalise_el2 is missing
> on e.g. the CPU_RESUME path with pKVM, hence leaving certain registers
> in an incorrect state.
> 
> One such example is ZCR_EL2 which remains configured with SVE traps
> enabled. And so using SVE on a CPU that has gone through a hotplug
> off/on cycle leads to a hyp panic. Not good.
> 
> [...]

Applied to kvmarm/next, thanks!

[1/4] KVM: arm64: Provide sanitized SYS_ID_AA64SMFR0_EL1 to nVHE
      https://git.kernel.org/kvmarm/kvmarm/c/8669651ce0d9
[2/4] KVM: arm64: Introduce finalise_el2_state macro
      https://git.kernel.org/kvmarm/kvmarm/c/e2d4f5ae1771
[3/4] KVM: arm64: Use sanitized values in __check_override in nVHE
      https://git.kernel.org/kvmarm/kvmarm/c/3c4cc31537ec
[4/4] KVM: arm64: Finalise EL2 state from pKVM PSCI relay
      https://git.kernel.org/kvmarm/kvmarm/c/6f10f2ec61c7

--
Best,
Oliver