From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: David Tolnay <dtolnay@gmail.com>, Peter Huewe <peterhuewe@gmx.de>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
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: Fri, 22 Feb 2019 07:30:16 -0800 [thread overview]
Message-ID: <1550849416.2787.5.camel@HansenPartnership.com> (raw)
In-Reply-To: <388c5b80-21a7-1e91-a11f-3a1c1432368b@gmail.com>
On Thu, 2019-02-21 at 18:14 -0800, David Tolnay wrote:
> Add a config TCG_VIRTIO_VTPM which enables a driver providing the
> guest kernel side of TPM over virtio.
What's the use case for using this over the current non-virtio vTPM?.
I always thought virtio was about guest to host transport efficiency,
but the phsical TPM, being connected over a very slow bus, is about as
inefficient as you can get in that regard, so why do we need to use
virtio to drive the virtual one?
> Use case: TPM support is needed for performing trusted work from
> within a virtual machine launched by Chrome OS.
The current vTPM does this, what's the use case for your special one?
> Tested inside crosvm, the Chrome OS virtual machine monitor. Crosvm's
> implementation of the virtio TPM device can be found in these two
> source
> files:
>
> - https://chromium.googlesource.com/chromiumos/platform/crosvm/+/18ce
> 5713e6cb99c40aafec52b67c28ba12a44f31/devices/src/virtio/tpm.rs
> - https://chromium.googlesource.com/chromiumos/platform/crosvm/+/18ce
> 5713e6cb99c40aafec52b67c28ba12a44f31/tpm2/src/lib.rs
>
> and is currently backed by the libtpm2 TPM simulator:
So is the reason simply that crosvm did vTPM emulation differently from
qemu and thus needs a different driver?
James
next prev parent reply other threads:[~2019-02-22 15:30 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 [this message]
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
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
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