[PATCH v3 0/3] Add support for loading SMBIOS OEM strings from a file

[Daniel P . Berrangé]

I previously added support for SMBIOS OEM strings tables but only
allowed for data to be passed inline. Potential users indicated they
wanted to pass some quite large data blobs which is inconvenient todo
inline. Thus I'm adding support for passing the data from a file.

In testing this I discovered the hard way that on x86 we're limited to
using the SMBIOS 2.1 entry point currently. This has a maximum size of
0xffff, and if you exceed this all sorts of wierd behaviour happens.

QEMU forces SMBIOS 2.1 on x86 because the default SeaBIOS firmware does
not support SMBIOS 3.0. The EDK2 firmware supports SMBIOS 3.0 and QEMU
defaults to this on the ARM virt machine type.

This series adds support for checking the SMBIOS 2.1 limits to protect
users from impossible to diagnose problems.

There is also a fix needed to SeaBIOS which fails to check for
integer overflow when it appends the type 0 table.

  https://mail.coreboot.org/hyperkitty/list/seabios@seabios.org/thread/3EMIOY=
6YS6MG5UQN3JJJS2A3DJZOVFR6/

IIUC, SMBIOS 3.0 should only be limited by what you can fit into RAM,
but in testing, EDK2 appears to hang shortly after the SMBIOS 3.0 data
size exceeds 128 KB. I've not spotted an obvious flaw in EDK2 or QEMU,
nor do I attempt to enforce a limit in QEMU for SMBIOS 3.0.

Changed in v3:

 - Adjust for qemu_open method signature change

Changed in v2:

 - Drop the patches that allowed choice of SMBIOS 2.1 / 3.0 entry
   point. There's no compelling reason to need 3.0 on x86 while
   aarch64 is 3.0 only.

Daniel P. Berrang=C3=A9 (3):
  hw/smbios: support loading OEM strings values from a file
  hw/smbios: report error if table size is too large
  qemu-options: document SMBIOS type 11 settings

 hw/smbios/smbios.c | 85 +++++++++++++++++++++++++++++++++++++++-------
 qemu-options.hx    | 41 ++++++++++++++++++++++
 2 files changed, 113 insertions(+), 13 deletions(-)

--=20
2.26.2