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

[Corey Bryant <coreyb@linux.vnet.ibm.com>]

This patch series provides VNVRAM persistent storage support that
QEMU can use internally.  The initial target user will be a software
vTPM 1.2 backend that needs to store keys in VNVRAM and be able to
reboot/migrate and retain the keys.

This support uses QEMU's block driver to provide persistent storage
by reading/writing VNVRAM data from/to a drive image.  The VNVRAM
drive image is provided with the -drive command line option just like
any other drive image and the vnvram_create() API will find it.

The APIs allow for VNVRAM entries to be registered, one at a time,
each with a maximum blob size.  Entry blobs can then be read/written
from/to an entry on the drive.  Here's an example of usage:

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