lkml.org 
[lkml]   [2020]   [Feb]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2
On Thu, Feb 13, 2020 at 02:04:12PM -0500, Stefan Berger wrote:
> On 2/13/20 1:35 PM, Jason Gunthorpe wrote:
> > On Thu, Feb 13, 2020 at 01:20:12PM -0500, Stefan Berger wrote:
> >
> > > I don't want side effects for the TPM 1.2 case here, so I am only modifying
> > > the flag for the case where the new TPM 2 is being used.  Here's the code
> > > where it shows the effect.
> > I'm surprised this driver is using AUTO_STARTUP, it was intended for
> > embedded cases where their is no firmware to boot the TPM.
>
> The TIS is also using it on any device.

TIS is a generic driver, and can run on TPMs without firmware
support. It doesn't know either way

> > Chips using AUTO_STARTUP are basically useless for PCRs/etc.
> >
> > I'd expect somthing called vtpm to have been started and PCRs working
> > before Linux is started??
>
> Yes, there's supposed to be firmware.
>
> I only see one caller to tpm2_get_cc_attrs_tbl(chip), which is necessary to
> call. This caller happens to be in tpm2_auto_startup.

That seems to be a mistake, proper startup of the driver should never
require auto_startup.

Jason

\
 
 \ /
  Last update: 2020-02-13 20:11    [W:0.056 / U:3.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site