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Re: [Qemu-devel] vNVRAM / blobstore design
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] vNVRAM / blobstore design |
Date: |
Wed, 27 Mar 2013 17:53:03 +0200 |
On Wed, Mar 27, 2013 at 11:43:53AM -0400, Kenneth Goldman wrote:
> A few comments FWIW
>
> When I first did TPM 1.2, I stored different parts of the TPM NV data
> (permanent data, owner evict keys, defined space) in different files. It got
> ugly and I eventually changed to one big blob, This was far more portable,
> worked better for real flash memory, etc. It also handles integrity and/or
> encryption with less overhead.
>
> As for encoding, I didn't bother with DER, XML, etc, as the TPM was big enough
> without importing complex parsers. The TPM already requires marshalling and
> unmarshalling code in its native binary format for command and response
> handling, so I just reused that code. I added version numbers and count
> values
> to handle changes to the format, and a hash to detect corruption.
>
> --
> Ken Goldman address@hidden
> 914-945-2415 (862-2415)
Yea it's not hard to invent a random format each time we write something
on disk.
But I think ASN.1 BER will be useful to have in qemu anyway. E.g. it's a
better format for migration than what we have now. Once we have it in
tree re-using it seems cleaner than maintaining some per-TPM thing.
--
MST
- [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/25
- Re: [Qemu-devel] vNVRAM / blobstore design, Anthony Liguori, 2013/03/25
- Re: [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/25
- Re: [Qemu-devel] vNVRAM / blobstore design, Kenneth Goldman, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design,
Michael S. Tsirkin <=
- Re: [Qemu-devel] vNVRAM / blobstore design, Joel Schopp, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design, Anthony Liguori, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design, Anthony Liguori, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/27
- Re: [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/28
- Re: [Qemu-devel] vNVRAM / blobstore design, Michael S. Tsirkin, 2013/03/28
- Re: [Qemu-devel] vNVRAM / blobstore design, Stefan Berger, 2013/03/28
- Re: [Qemu-devel] vNVRAM / blobstore design, Anthony Liguori, 2013/03/28