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[Qemu-devel] Re: Re: [PATCH v2 6/6] Pass cpu speed into SM BIOS.


From: Sebastian Herbszt
Subject: [Qemu-devel] Re: Re: [PATCH v2 6/6] Pass cpu speed into SM BIOS.
Date: Thu, 28 Aug 2008 01:42:59 +0200

Gleb Natapov wrote:
This is the incorrect frequency for a QEMU guest. I'm not sure why this is included. What does passing the frequency give us?

This is included for two reasons. First one is to demonstrate that
proposed interface is extensible. Second is that Micrisoft SVVP test requires this info (and much more) to be set in SMBIOS tables.

Can you elaborate a bit on the "and much more" part? Is this the stuff
described in "SMBIOS "Designed for Windows" Logo Requirements" at
http://www.microsoft.com/whdc/system/platform/firmware/SMBIOS.mspx ?

I think yes. There is Microsoft test suit that test SMBIOS
implementation. Running it on bochs bios results in a couple of errors.

Could you maybe post those errors on the bochs mailing list?

Some fields cannot be empty. Some bits should be set. Most things can be
fixed without qemu help, but for CPU speed we need to ask qemu.

What about computing the frequency in rombios?

Using real HW value seams to be better than just provide some default one.

What downside does using a default value have? On the upside this patch would
not be needed.


What value do you propose? Without knowing how Windows uses it we can't
say what are the downsides.

- Sebastian





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