On Mon, Jan 09, 2017 at 08:23:02AM -0800, James Bottomley wrote: > 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.
Not sure I see it, surely running a program in userspace is simpler than patching the kernel? > 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. I haven't tried it, but qemu has TPM passthrough support, so it should be able to pass /dev/tpm1, created by vtpm through to the guest. AFAIK this should support all existing guests without a custom kernel or messing with module options. Honestly, I'd rather see the emulator community get behind vtpm.. Jason ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ tpmdd-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
