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Re: [PATCH] tpm: add backend for mssim


From: Stefan Berger
Subject: Re: [PATCH] tpm: add backend for mssim
Date: Wed, 14 Dec 2022 21:42:32 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1



On 12/14/22 07:43, James Bottomley wrote:
On Wed, 2022-12-14 at 11:52 +0000, Daniel P. Berrangé wrote:
It is a shame there isn't a standardized protocol for software TPM
communication, as that'd avoid the need for multiple backends.

Technically the mssim protocol is the standard, being part of the
reference implementation, but practically it's terrible:  Using two

... and it's missing functionality related to state migration

ports per vTPM is hardly scalable in a cloud situation and, as you say,
it has no security.  Ideally someone with TCG connections would try to
standardize a more scalable network server protocol, something nicely
rest based that identified the vTPM by say its EK name.

James




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