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Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM |
Date: |
Wed, 1 Mar 2017 12:54:14 +0000 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, Mar 01, 2017 at 07:25:28AM -0500, Stefan Berger wrote:
> On 06/16/2016 04:25 AM, Daniel P. Berrange wrote:
> > On Thu, Jun 16, 2016 at 09:05:20AM +0100, Dr. David Alan Gilbert wrote:
> > > * Stefan Berger (address@hidden) wrote:
> > > > On 06/15/2016 03:30 PM, Dr. David Alan Gilbert wrote:
> > > <snip>
> > >
> > > > > So what was the multi-instance vTPM proxy driver patch set about?
> > > > That's for containers.
> > > Why have the two mechanisms? Can you explain how the multi-instance
> > > proxy works; my brief reading when I saw your patch series seemed
> > > to suggest it could be used instead of CUSE for the non-container case.
> > One of the key things that was/is not appealing about this CUSE approach
> > is that it basically invents a new ioctl() mechanism for talking to
> > a TPM chardev. With in-kernel vTPM support, QEMU probably doesn't need
> > to have any changes at all - its existing driver for talking to TPM
>
> We still need the control channel with the vTPM to reset it upon VM reset,
> for getting and setting the state of the vTPM upon snapshot/suspend/resume,
> changing locality, etc.
You ultimately need the same mechanisms if using in-kernel vTPM with
containers as containers can support snapshot/suspend/resume/etc too.
Regards,
Daniel
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- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Stefan Berger, 2017/03/01
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM,
Daniel P. Berrange <=
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Stefan Berger, 2017/03/01
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Michael S. Tsirkin, 2017/03/01
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Daniel P. Berrange, 2017/03/01
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Dr. David Alan Gilbert, 2017/03/01
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Michael S. Tsirkin, 2017/03/01
- Re: [Qemu-devel] [PATCH v5 1/4] Provide support for the CUSE TPM, Stefan Berger, 2017/03/01