Re: [Qemu-devel] [PATCH 0/7] VNVRAM persistent storage

[Anthony Liguori <aliguori@us.ibm.com>]

Corey Bryant <coreyb@linux.vnet.ibm.com> writes:

> On 05/23/2013 02:03 PM, Anthony Liguori wrote:
>> Corey Bryant <coreyb@linux.vnet.ibm.com> writes:
>>
> One of the difficulties in virtualizing a TPM is that it doesn't support 
> SR-IOV.  So the existing passthrough vTPM can only be used by one guest. 
>   We're planning to provide a software emulated vTPM that uses libtpms 
> and it needs to store blobs somewhere that is persistent.  We can't 
> store blobs in the host TPM's hardware NVRAM.  So we have to virtualize 
> it in software.  And we figured we'd provide a persistent storage 
> mechanism that other parts of QEMU could use rather than limit it to 
> just the vTPM's use.

I think you are misunderstanding my feedback.

See http://mid.gmane.org/87ehf03dgw.fsf@codemonkey.ws

Regards,

Anthony Liguori

>
> -- 
> Regards,
> Corey Bryant
>
>>>
>>> VNVRAM *vnvram;
>>> int errcode
>>> const VNVRAMEntryName entry_name;
>>> const char *blob_w = "blob data";
>>> char *blob_r;
>>> uint32_t blob_r_size;
>>>
>>> vnvram = vnvram_create("drive-ide0-0-0", false, &errcode);
>>> strcpy((char *)entry_name, "first-entry");
>>> vnvram_register_entry(vnvram, &entry_name, 1024);
>>> vnvram_write_entry(vnvram, &entry_name, (char *)blob_w, strlen(blob_w)+1);
>>> vnvram_read_entry(vnvram, &entry_name, &blob_r, &blob_r_size);
>>> vnvram_delete(vnvram);
>>>
>>> Thanks,
>>> Corey
>>>
>>> Corey Bryant (7):
>>>    vnvram: VNVRAM bdrv support
>>>    vnvram: VNVRAM in-memory support
>>>    vnvram: VNVRAM bottom-half r/w scheduling support
>>>    vnvram: VNVRAM internal APIs
>>>    vnvram: VNVRAM additional debug support
>>>    main: Initialize VNVRAM
>>>    monitor: QMP/HMP support for retrieving VNVRAM details
>>>
>>>   Makefile.objs    |    2 +
>>>   hmp.c            |   32 ++
>>>   hmp.h            |    1 +
>>>   monitor.c        |    7 +
>>>   qapi-schema.json |   47 ++
>>>   qmp-commands.hx  |   41 ++
>>>   vl.c             |    6 +
>>>   vnvram.c         | 1254 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>   vnvram.h         |   36 ++
>>>   9 files changed, 1426 insertions(+), 0 deletions(-)
>>>   create mode 100644 vnvram.c
>>>   create mode 100644 vnvram.h
>>
>>