linux-kernel - Re: [PATCH v2 06/11] KVM: arm64: hide MOPS from guests

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Message-ID: <87ttvpndhx.wl-maz@kernel.org>
Date:   Sat, 03 Jun 2023 09:42:18 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Kristina Martsenko <kristina.martsenko@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Luis Machado <luis.machado@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/11] KVM: arm64: hide MOPS from guests

On Tue, 09 May 2023 15:22:30 +0100,
Kristina Martsenko <kristina.martsenko@....com> wrote:
> 
> As FEAT_MOPS is not supported in guests yet, hide it from the ID
> registers for guests.
> 
> The MOPS instructions are UNDEFINED in guests as HCRX_EL2.MSCEn is not
> set in HCRX_GUEST_FLAGS, and will take an exception to EL1 if executed.
> 
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>

This is very likely to clash with Jing's series that completely
reworks the whole idreg series, but as long as this is on its own
branch, we can deal with that.

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.