From: Matthew Garrett <mjg59@google.com>
To: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: David Tolnay <dtolnay@gmail.com>, Peter Huewe <peterhuewe@gmx.de>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
linux-integrity <linux-integrity@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
virtualization@lists.linux-foundation.org, dgreid@chromium.org,
apronin@chromium.org
Subject: Re: [PATCH] tpm: Add driver for TPM over virtio
Date: Mon, 25 Feb 2019 14:24:44 -0800 [thread overview]
Message-ID: <CACdnJuus3yOcNy-uKWh_Mt-eDfP8xePize572jg92a5zkuECrA@mail.gmail.com> (raw)
In-Reply-To: <1551132882.3226.67.camel@HansenPartnership.com>
On Mon, Feb 25, 2019 at 2:14 PM James Bottomley
<James.Bottomley@hansenpartnership.com> wrote:
> > Being able to get away without any LPC support code at all seems like
> > a win, as does not having any ACPI or DeviceTree parsing code.
> > Injecting the hardware information via the kernel command line isn't
> > impossible, but it's not an attractive solution.
>
> Heh, but isn't that exactly what crosvm did for usb:
>
> https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/add5a4c3751778e5380f00b2ee6cebcb6bda48fc
My understanding is that the crosvm USB code is intended to allow
arbitrary USB hardware to be passed through to the guest - doing this
via virtio sounds complicated (you'd need a virtio driver that covered
every USB class, and how would you manage that for devices that are
handled in userland at the moment), whereas the virtio TPM support is
intended to pass through a software TPM rather than grant access to
the host TPM.
> Effectively it bypasses the hypervisor altogether and simply makes a
> direct connection to the host devices. The TPM could actually work in
> exactly the same way, except you'd have to use the socsim IP connection
> (which all TSSs support) rather than a file descriptor.
I don't really follow - how would in-kernel TPM features work then?
next prev parent reply other threads:[~2019-02-25 22:24 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 2:14 [PATCH] tpm: Add driver for TPM over virtio David Tolnay
2019-02-22 5:51 ` Michael S. Tsirkin
2019-02-22 5:51 ` Michael S. Tsirkin
2019-02-22 21:40 ` David Tolnay
2019-02-22 22:24 ` Michael S. Tsirkin
2019-02-22 22:24 ` Michael S. Tsirkin
2019-02-23 1:23 ` David Tolnay
2019-02-25 9:58 ` Jarkko Sakkinen
2019-02-22 10:26 ` Jarkko Sakkinen
2019-02-22 15:23 ` Michael S. Tsirkin
2019-02-22 15:23 ` Michael S. Tsirkin
2019-02-22 19:31 ` Jarkko Sakkinen
2019-02-22 19:33 ` Jarkko Sakkinen
2019-02-22 21:25 ` Michael S. Tsirkin
2019-02-22 21:25 ` Michael S. Tsirkin
2019-02-22 21:50 ` Jarkko Sakkinen
2019-02-22 22:24 ` David Tolnay
2019-02-22 22:36 ` Jarkko Sakkinen
2019-02-22 23:05 ` Michael S. Tsirkin
2019-02-22 23:05 ` Michael S. Tsirkin
2019-02-24 9:33 ` Jarkko Sakkinen
2019-02-22 20:55 ` Michael S. Tsirkin
2019-02-22 20:55 ` Michael S. Tsirkin
2019-02-22 21:30 ` Jarkko Sakkinen
2019-02-22 10:30 ` Jarkko Sakkinen
2019-02-22 15:30 ` James Bottomley
2019-02-22 21:16 ` Michael S. Tsirkin
2019-02-22 21:16 ` Michael S. Tsirkin
2019-02-22 21:31 ` Jason Gunthorpe
2019-02-22 21:59 ` Jarkko Sakkinen
2019-02-22 22:07 ` Michael S. Tsirkin
2019-02-22 22:07 ` Michael S. Tsirkin
2019-02-22 22:14 ` Jarkko Sakkinen
2019-02-22 22:00 ` David Tolnay
2019-02-22 22:18 ` James Bottomley
2019-02-23 0:45 ` David Tolnay
2019-02-23 1:34 ` James Bottomley
2019-02-23 2:41 ` David Tolnay
2019-02-24 16:30 ` James Bottomley
2019-02-24 17:51 ` Jarkko Sakkinen
2019-02-24 22:12 ` David Tolnay
2019-02-25 9:55 ` Jarkko Sakkinen
2019-02-25 15:36 ` James Bottomley
2019-02-25 19:17 ` Matthew Garrett
2019-02-25 19:54 ` Jarkko Sakkinen
2019-02-25 20:20 ` James Bottomley
2019-02-25 21:00 ` Matthew Garrett
2019-02-25 21:02 ` Matthew Garrett
2019-02-25 22:14 ` James Bottomley
2019-02-25 22:24 ` Matthew Garrett [this message]
2019-02-25 22:32 ` James Bottomley
2019-02-25 22:43 ` Matthew Garrett
2019-02-25 22:51 ` James Bottomley
2019-02-25 23:02 ` Matthew Garrett
2019-02-25 23:09 ` James Bottomley
2019-02-25 21:05 ` Jarkko Sakkinen
2019-02-25 22:24 ` James Bottomley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CACdnJuus3yOcNy-uKWh_Mt-eDfP8xePize572jg92a5zkuECrA@mail.gmail.com \
--to=mjg59@google.com \
--cc=James.Bottomley@hansenpartnership.com \
--cc=apronin@chromium.org \
--cc=dgreid@chromium.org \
--cc=dtolnay@gmail.com \
--cc=jarkko.sakkinen@linux.intel.com \
--cc=jasowang@redhat.com \
--cc=jgg@ziepe.ca \
--cc=linux-integrity@vger.kernel.org \
--cc=mst@redhat.com \
--cc=peterhuewe@gmx.de \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.