Re: [PATCH] tpm-emulator: add a TPM emulator pass through

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Sun, Jan 08, 2017 at 04:58:33PM -0800, James Bottomley wrote:
> I noticed, while playing around with the kernel based resource
> manager, that it's very advantageous to have an emulated TPM device to
> test now that I'm playing with startup sequences and TPM ownership.
> 
> This is an emulator pass through.  It connects an existing emulator
> running on the platform (expected to be the MS Simulator available
> from https://sourceforge.net/projects/ibmswtpm2/) and adds it as an
> in-kernel device, meaning you can exercise the kernel TPM interface
> from either inside the kernel or using the device node.
> 
> The tpm-emulator simply connects to the command socket of the MS
> simulator (on localhost:2321) and proxies TPM commands.  The
> destination and port are settable as module parameters meaning that
> the TPM emulator doesn't have to be running locally.

What is wrong with using drivers/char/tpm/tpm_vtpm_proxy.c and doing
the socket connection in userspace?

Jason

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most 
engaging tech sites, SlashDot.org! http://sdm.link/slashdot