From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: Re: [PATCH] tpm-emulator: add a TPM emulator pass through Date: Mon, 09 Jan 2017 08:23:02 -0800 Message-ID: <1483978982.2448.7.camel@HansenPartnership.com> References: <1483923513.2644.1.camel@HansenPartnership.com> <20170109154945.GA28023@obsidianresearch.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170109154945.GA28023-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tpmdd-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Jason Gunthorpe Cc: tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: tpmdd-devel@lists.sourceforge.net On Mon, 2017-01-09 at 08:49 -0700, Jason Gunthorpe wrote: > 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? Simplicity, mostly. It's a tiny driver to proxy the network protocol directly, meaning it's much easier to set up. Plus if you're running smoke tests in a VM you can actually run the emulator in the host without any additional code in the guest. James ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot