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xen-devel
Re: [Xen-devel] [RFC] [PATCH] HVM SMBIOS support 1/6
On Tue, 2006-07-11 at 19:34 +0100, Keir Fraser wrote:
> On 11 Jul 2006, at 19:12, Andrew D. Ball wrote:
>
> > Do you see any other things to work on for the SMBIOS patches? Making
> > SMBIOS not optional cuts down on a bit of the code, so I'm working on
> > that and getting the code to run on the latest changeset today.
>
> I think they're basically okay. I find it a bit weird that hvmloader
> puts SMBIOS tables in a fixed place and then rombios copies them -- not
> sure why that's needed but I suppose you're only copying what is done
> for ACPI tables. Couldn't hvmloader write all BIOS tables to a safe
> location and be done with them, or is the problem that 0xf0000 upwards
> is not available at the time hvmloader runs?
More or less. 0xf0000-0xfffff is reserved for the ROMBIOS, but I need a
31-bit entry point somewhere on a 16-byte boundary there. It's only the
31-bit entry point that gets copied.
> Also, is the e820
> reservation entry actually valid: 0x9f000-0xA0000 is reserved, but
> rombios copies the tables out of that area, right? Does rombios also
> update the e820 table?
I'm a little confused about this myself. Whenever I change the e820 map
in libxenguest, it seems to work, but I see two other places that might
change it
(1) copy_e820_table in rombios.c -- looks like this doesn't do anything
if 0x91e8 is 0, which is probably the case.
(2) some code in vmxassist's setup.c -- looks like this has a copy of
the same e820map defined in xc_hvm_build.c and only changes it if TEST
is defined.
Thanks for your help!
Andrew
>
> -- Keir
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
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