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

Paolo Bonzini
2013-10-02T14:33:26Z

Il 02/10/2013 16:08, Alexander Graf ha scritto:
> > The hwrng is accessible by host userspace via /dev/mem.
>
> 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.

With Michael's earlier patch in this series, the hwrng is accessible by
host userspace via /dev/hwrng, no?

Paolo