linux-kernel - Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on some powernv systems

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Message-ID: <1380751988.645.72.camel@pasglop>
Date:	Thu, 03 Oct 2013 08:13:08 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alexander Graf <agraf@...e.de>
Cc:	Michael Ellerman <michael@...erman.id.au>,
	Gleb Natapov <gleb@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, mpm@...enic.com,
	herbert@...dor.hengli.com.au, linuxppc-dev@...abs.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on
 some powernv systems

On Wed, 2013-10-02 at 16:08 +0200, Alexander Graf wrote:
> A guest should live on the same permission level as a user space
> application. If you run QEMU as UID 1000 without access to /dev/mem,
> why should the guest suddenly be able to directly access a memory
> location (MMIO) it couldn't access directly through a normal user
> space interface.
> 
> It's basically a layering violation.

Guys, please stop with the academic non-sense !

Ben.


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