Re: [Qemu-devel] Emulation of TCG OPAL self-encrypting drive

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Thu, Jan 10, 2019 at 12:05:32AM +0100, David Kozub wrote:
> On Mon, 7 Jan 2019, Stefan Hajnoczi wrote:
> 
> > QEMU supports LUKS encrypted disk images so no new code is needed for
> > the actual encryption.
> 
> Thanks for the feedback, Stefan. I know very little about qemu internals (I
> looked around a bit). One issue is: OPAL needs some persistent data outside
> of the actual user-visible data. How does that fit in with storage in QEMU?
> Perhaps the implementation could just occupy a fixed size of the associated
> storage for the OPAL state.

See block/crypto.c for the LUKS block driver.  Perhaps OPAL needs to
something similar (OPAL state + LUKS).

> > > Or, just a pass-through to a block device in the host - but a pass-through
> > > that would allow OPAL commands.
> > 
> > You can pass through a storage controller using PCI passthrough or you
> > can pass through a SCSI LUN, but there is no ATA passthrough.
> 
> I currently don't have a usable box for PCI passthrough. I'm thinking that
> ATA passthrough could be generally usable for any fiddling and perhaps not
> too difficult to implement.
> 
> If I understand QEMU sources correctly, this needs to touch hw/ide/core.c
> (ide_exec_cmd), either adding a layer for OPAL, or just forwarding ATA
> commands for pass-through. Right?

Yes.

Stefan

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