Commit 46ee83 changes guest fingerprint unconditionally

commit 46ee8349d22d11ec4b8609c5bf14db9409eef974
 Author: Gerd Hoffmann 
 Date:   Thu Jun 7 10:34:31 2012 +0200

update bios date

Linux ignores some information from acpi in case the bios is old
    as acpi support used to be buggy in the early days.  This affects
    ressources for example (unless forced with pci=use_crs).  So lets
    go for something more recent.  With this patch applied the
    ressources for \SB.PCI0 will show up in /proc/{iomem,ioports},
    tagged as "PCI Bus 0000:00".

Signed-off-by: Gerd Hoffmann

Breaks qemu-test:

*** Running tests ***
Running test /tests/finger-print.sh...		OK
--- fingerprints/pc-1.0.x86_64	2011-12-18 13:08:40.000000000 -0600
+++ fingerprint.txt	2012-08-22 13:22:29.000000000 -0500
@@ -57,7 +57,7 @@
 /sys/bus/pci/devices/0000:00:06.0/revision=0x00
 /sys/bus/pci/devices/0000:00:06.0/virtio/host-features=0x710006d4
 /sys/class/dmi/id/bios_vendor=Bochs
-/sys/class/dmi/id/bios_date=01/01/2007
+/sys/class/dmi/id/bios_date=01/01/2011
 /sys/class/dmi/id/bios_version=Bochs
 /sys/class/dmi/id/chassis_vendor=Bochs
 /sys/class/dmi/id/chassis_version=
Guest fingerprint changed for pc-1.0!

Can we make the bios date set from fw_cfg?  We really can't change the
SMBIOS information unconditionally like this.

Regards,

Anthony Liguori

Commit 46ee83 changes guest fingerprint unconditionally

[Kevin O'Connor]

On Wed, Aug 22, 2012 at 01:29:57PM -0500, [e-mail] wrote:
> commit 46ee8349d22d11ec4b8609c5bf14db9409eef974
>  Author: Gerd Hoffmann 
>  Date:   Thu Jun 7 10:34:31 2012 +0200
> update bios date

[...]
> Guest fingerprint changed for pc-1.0!
>
> Can we make the bios date set from fw_cfg?  We really can't change the
> SMBIOS information unconditionally like this.

It was thought this change would be non-invasive.  If it's going to
cause a problem, we can revert the change and figure out an
alternative.  How problematic is it to change the date?

-Kevin

Commit 46ee83 changes guest fingerprint unconditionally

[Gerd Hoffmann]

> -/sys/class/dmi/id/bios_date=01/01/2007
> +/sys/class/dmi/id/bios_date=01/01/2011
> Can we make the bios date set from fw_cfg?  We really can't change the
> SMBIOS information unconditionally like this.

Why is this so problematic?  If you update the bios on real hardware the
bios date will change too ...

cheers,
  Gerd