linux-kernel - Re: [PATCH v5 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall

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Message-ID: <20210125121315.GA25360@gaia>
Date:   Mon, 25 Jan 2021 12:13:16 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v5 04/21] arm64: Provide an 'upgrade to VHE' stub
 hypercall

On Mon, Jan 25, 2021 at 10:50:02AM +0000, Marc Zyngier wrote:
> As we are about to change the way a VHE system boots, let's
> provide the core helper, in the form of a stub hypercall that
> enables VHE and replicates the full EL1 context at EL2, thanks
> to EL1 and VHE-EL2 being extremely similar.
> 
> On exception return, the kernel carries on at EL2. Fancy!
> 
> Nothing calls this new hypercall yet, so no functional change.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Acked-by: David Brazdil <dbrazdil@...gle.com>

Acked-by: Catalin Marinas <catalin.marinas@....com>