linux-kernel - Re: [PATCH v2 5/7] KVM: arm64: Add a visibility bit to ignore user writes

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Message-ID: <CAAeT=FwZ28XRgAkUH_aTxZfSPHRRrEUSy8-R-dj6rs6fmOnv0g@mail.gmail.com>
Date:   Tue, 6 Sep 2022 19:40:10 -0700
From:   Reiji Watanabe <reijiw@...gle.com>
To:     Oliver Upton <oliver.upton@...ux.dev>
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/7] KVM: arm64: Add a visibility bit to ignore user writes

On Fri, Sep 2, 2022 at 8:48 AM Oliver Upton <oliver.upton@...ux.dev> wrote:
>
> We're about to ignore writes to AArch32 ID registers on AArch64-only
> systems. Add a bit to indicate a register is handled as write ignore
> when accessed from userspace.
>
> Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>

Reviewed-by: Reiji Watanabe <reijiw@...gle.com>