Re: [PATCH] tpm: Add driver for TPM over virtio

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On Mon, 2019-02-25 at 15:02 -0800, Matthew Garrett wrote:
> On Mon, Feb 25, 2019 at 2:51 PM James Bottomley
> <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > On Mon, 2019-02-25 at 14:43 -0800, Matthew Garrett wrote:
> > > You still need a transport mechanism through the hypervisor to
> > > communicate with the host - what would you be using in that case
> > > instead of virtio?
> > 
> > Socsim is net transported; it's sort of the TPM equivalent of NFS
> > or iSCSI storage for guests.
> 
> Oh, so it relies on the guest being able to reach the host via
> network? Hmm. That's a different security tradeoff. It presumably
> also prevents any in-kernel use before networking is up?

Exactly, that's why I'm not recommending it.  However, the initrdless
early net nastiness path has already been trodden by the NFS/iSCSI
root people ...

James




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