linux-kernel - Re: [PATCH 00/12] KVM: arm64: FF-A proxy for pKVM

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Date:   Fri,  2 Dec 2022 11:17:43 +0000
From:   Will Deacon <will@...nel.org>
To:     Alexandru Elisei <alexandru.elisei@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        James Morse <james.morse@....com>,
        Quentin Perret <qperret@...gle.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Andrew Walbran <qwandor@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/12] KVM: arm64: FF-A proxy for pKVM

On Wed, 16 Nov 2022 17:03:23 +0000, Quentin Perret wrote:
> pKVM's primary goal is to protect guest pages from a compromised host by
> enforcing access control restrictions using stage-2 page-tables. Sadly,
> this cannot prevent TrustZone from accessing non-secure memory, and a
> compromised host could, for example, perform a 'confused deputy' attack
> by asking TrustZone to use pages that have been donated to protected
> guests. This would effectively allow the host to have TrustZone
> exfiltrate guest secrets on its behalf, hence breaking the isolation
> that pKVM intends to provide.
> 
> [...]

Applied first two cleanups to arm64 (for-next/ffa), thanks!

[01/12] firmware: arm_ffa: Move constants to header file
        https://git.kernel.org/arm64/c/229d58e31678
[02/12] firmware: arm_ffa: Move comment before the field it is documenting
        https://git.kernel.org/arm64/c/c8e320b00a2a

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev