linux-kernel - Re: [PATCH] KVM: arm64: Synchronize SMEN on vcpu schedule out

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Date:   Mon, 23 Jan 2023 20:26:16 +0000
From:   Oliver Upton <oliver.upton@...ux.dev>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvmarm@...ts.linux.dev,
        Dong Bo <dongbo4@...wei.com>
Cc:     Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Nianyao Tang <tangnianyao@...wei.com>,
        Marc Zyngier <maz@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH] KVM: arm64: Synchronize SMEN on vcpu schedule out

On Tue, 20 Dec 2022 18:50:24 +0800, Dong Bo wrote:
> From: Nianyao Tang <tangnianyao@...wei.com>
> 
> If we have VHE and need to reenable SME for host in
> kvm_arch_vcpu_put_fp, CPACR.SMEN is modified from 0 to 1. Trap
> control for reading SVCR is modified from enable to disable.
> Synchronization is needed before reading SVCR later in
> fpsimd_save, or it may cause sync exception which can not be
> handled by host.
> 
> [...]

Applied to kvmarm/next, thanks!

[1/1] KVM: arm64: Synchronize SMEN on vcpu schedule out
      https://git.kernel.org/kvmarm/kvmarm/c/59d78a2ec0e9

--
Best,
Oliver