From: Jarkko Sakkinen <jarkko@kernel.org>
To: Jerry Snitselaar <jsnitsel@redhat.com>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>,
linux-integrity@vger.kernel.org, Jason Gunthorpe <jgg@ziepe.ca>,
Peter Huewe <peterhuewe@gmx.de>, Borislav Petkov <bp@alien8.de>,
Nayna Jain <nayna@linux.ibm.com>
Subject: Re: [PATCH v2 0/5] tpm_tis: fix interrupts (again)
Date: Tue, 27 Oct 2020 19:14:06 +0200 [thread overview]
Message-ID: <20201027171406.GA6292@kernel.org> (raw)
In-Reply-To: <87o8kox2lh.fsf@redhat.com>
On Mon, Oct 26, 2020 at 11:29:46AM -0700, Jerry Snitselaar wrote:
>
> Jarkko Sakkinen @ 2020-10-24 05:20 MST:
>
> > On Tue, Oct 20, 2020 at 04:10:42PM -0700, Jerry Snitselaar wrote:
> >>
> >> Jarkko Sakkinen @ 2020-10-18 14:05 MST:
> >>
> >> > On Tue, Oct 13, 2020 at 08:15:36AM -0700, Jerry Snitselaar wrote:
> >> >>
> >> >> Jarkko Sakkinen @ 2020-10-12 18:17 MST:
> >> >>
> >> >> > On Thu, Oct 01, 2020 at 11:09:20AM -0700, James Bottomley wrote:
> >> >> >> The current state of the TIS TPM is that interrupts have been globally
> >> >> >> disabled by various changes. The problems we got reported the last
> >> >> >> time they were enabled was interrupt storms. With my own TIS TPM,
> >> >> >> I've found that this is caused because my TPM doesn't do legacy
> >> >> >> cycles, The TIS spec (chapter 6.1 "Locality Usage Per Register")
> >> >> >> requires any TIS TPM without legacy cycles not to act on any write to
> >> >> >> an interrupt register unless the locality is enabled. This means if
> >> >> >> an interrupt fires after we relinquish the locality, the TPM_EOI in
> >> >> >> the interrupt routine is ineffective meaning the same interrupt
> >> >> >> triggers over and over again. This problem also means we can have
> >> >> >> trouble setting up interrupts on TIS TPMs because the current init
> >> >> >> code does the setup before the locality is claimed for the first time.
> >> >> >>
> >> >> >> James
> >> >> >
> >> >> > You should consider expanding the audience. Jerry, once you have some
> >> >> > bandwidth (no rush, does not land before rc2), it would be great that if
> >> >> > you could try this. I'm emphasizing this just because of the
> >> >> > intersection. I think it would also make senset to get tested-by from
> >> >> > Nayna.
> >> >>
> >> >> I will run some tests on some other systems I have access to. As noted
> >> >> in the other email I did a quick test with a t490s with an older bios
> >> >> that exhibits the problem originally reported when Stefan's patch
> >> >> enabled interrupts.
> >> >
> >> > Thank you. As said, I can make a pull request to rc2 or even rc3, if
> >> > needed.
> >> >
> >> > /Jarkko
> >>
> >> So outside of the t490s I have access to, it looks like the nuc5 with
> >> tpm2.0 device, and and older lenovo D30 with a tpm1.2 device both are
> >> not using interrupts. I'm digging around to see if I can find some
> >> other systems that I can test interrupts on.
> >>
> >> Regards,
> >> Jerry
> >
> > I'm going to test with this C720P chromebook, which has a long standing
> > bug in the kernel bugzilla. I got it a while ago but it's stuck in the
> > boot.
> >
> > If that doesn't boot, I'll pick up old Ivylake NUC from the office,
> > which has TPM 1.2 and bit newer TPM 2.0 NUC. Should anyway pick them,
> > have not used them for testing for a while because of pandemia.
> >
> > /Jarkko
>
> My search continues through the systems in our labs. Running into the
> same issue with the Dells. Looking at the TCPA table it looks like
> they aren't set up for interrupts as well. I have some tpm2.0 systems
> to still try.
The chromebook that I have feels like bricked, at least for the window
for testing this bug. I'll pick up the nucs tomorrow.
> Jerry
/Jarkko
prev parent reply other threads:[~2020-10-27 17:14 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 18:09 [PATCH v2 0/5] tpm_tis: fix interrupts (again) James Bottomley
2020-10-01 18:09 ` [PATCH v2 1/5] tpm_tis: Fix check_locality for correct locality acquisition James Bottomley
2020-10-05 15:34 ` Jarkko Sakkinen
2020-10-05 19:00 ` James Bottomley
2020-10-05 20:32 ` Jarkko Sakkinen
2020-10-19 23:16 ` Jerry Snitselaar
2020-10-24 12:07 ` Jarkko Sakkinen
2020-10-30 12:13 ` Jarkko Sakkinen
2020-10-01 18:09 ` [PATCH v2 2/5] tpm_tis: Clean up locality release James Bottomley
2020-10-05 17:02 ` Jarkko Sakkinen
2020-10-05 19:05 ` James Bottomley
2020-10-05 20:34 ` Jarkko Sakkinen
2020-10-05 17:03 ` Jarkko Sakkinen
2020-10-19 23:17 ` Jerry Snitselaar
2020-10-24 12:10 ` Jarkko Sakkinen
2020-10-30 12:17 ` Jarkko Sakkinen
2020-10-30 15:47 ` James Bottomley
2020-10-30 21:52 ` Jarkko Sakkinen
2020-10-01 18:09 ` [PATCH v2 3/5] tpm_tis: Fix interrupts for TIS TPMs without legacy cycles James Bottomley
2020-10-05 17:05 ` Jarkko Sakkinen
2020-10-20 0:14 ` Jerry Snitselaar
2020-10-24 12:15 ` Jarkko Sakkinen
2020-10-30 12:18 ` Jarkko Sakkinen
2020-10-30 16:06 ` Jerry Snitselaar
2020-11-03 4:16 ` Jarkko Sakkinen
2020-12-01 18:12 ` Jerry Snitselaar
2020-12-01 19:49 ` Jerry Snitselaar
2020-12-01 21:06 ` James Bottomley
2020-12-01 21:47 ` Jerry Snitselaar
2020-10-01 18:09 ` [PATCH v2 4/5] tpm_tis: fix IRQ probing James Bottomley
2020-10-05 17:05 ` Jarkko Sakkinen
2020-10-19 23:41 ` Jerry Snitselaar
2020-10-24 12:17 ` Jarkko Sakkinen
2020-10-30 12:43 ` Jarkko Sakkinen
2020-10-30 15:49 ` James Bottomley
2020-10-30 16:11 ` Jerry Snitselaar
2020-11-03 4:43 ` Jarkko Sakkinen
2020-11-03 23:00 ` Jerry Snitselaar
2020-11-04 0:31 ` Jarkko Sakkinen
2020-11-03 4:17 ` Jarkko Sakkinen
2020-11-06 15:32 ` Jarkko Sakkinen
2020-11-06 16:21 ` James Bottomley
2020-11-06 22:07 ` Jarkko Sakkinen
2020-10-01 18:09 ` [PATCH v2 5/5] Revert "tpm: Revert "tpm_tis_core: Turn on the TPM before probing IRQ's"" James Bottomley
2020-10-19 20:23 ` Jerry Snitselaar
2020-10-19 22:54 ` James Bottomley
2020-10-19 23:40 ` Jerry Snitselaar
2020-10-12 5:39 ` [PATCH v2 0/5] tpm_tis: fix interrupts (again) Jerry Snitselaar
2020-10-13 1:23 ` Jarkko Sakkinen
2020-10-18 5:34 ` Jarkko Sakkinen
2020-10-13 1:17 ` Jarkko Sakkinen
2020-10-13 15:15 ` Jerry Snitselaar
2020-10-13 15:24 ` James Bottomley
2020-10-13 16:05 ` Jerry Snitselaar
2020-10-14 15:03 ` Hans de Goede
2020-10-14 15:23 ` James Bottomley
2020-10-14 16:04 ` Hans de Goede
2020-10-14 16:34 ` Jerry Snitselaar
2020-10-14 16:46 ` Hans de Goede
2020-10-14 17:01 ` Jerry Snitselaar
2020-10-14 17:04 ` Jerry Snitselaar
2020-10-14 20:58 ` Jerry Snitselaar
2020-10-15 7:38 ` Hans de Goede
2020-10-18 21:09 ` Jarkko Sakkinen
2020-10-15 15:36 ` James Bottomley
2020-10-15 18:48 ` Jerry Snitselaar
2020-10-15 18:57 ` James Bottomley
2020-10-15 19:16 ` Jerry Snitselaar
2020-10-14 16:49 ` James Bottomley
2020-10-18 21:05 ` Jarkko Sakkinen
2020-10-20 23:10 ` Jerry Snitselaar
2020-10-24 12:20 ` Jarkko Sakkinen
2020-10-26 18:29 ` Jerry Snitselaar
2020-10-27 17:14 ` Jarkko Sakkinen [this message]
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