Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support

[Paolo Bonzini]

On 25/07/2017 18:14, Laszlo Ersek wrote:
>   "No regressions became apparent in tests with a range of Windows
>    (XP-10)"
> 
> In theory, w2k falls within that range.

Nope, Windows 2000 is like NT 5.0, XP is like NT 5.1. :(

One possibility is to fix it in SeaBIOS instead: if you get a 2.0 FADT
and an XSDT and no RSDT, it can build an RSDT and a 1.0 FADT itself,
patching the RSDT to point to it.

It's a hack, but it's the only place I see to make it "just work".  And
it could be extended nicely in the future.

All QEMU would have to do is to provide an XSDT _instead_ of an RSDT.

Paolo

> In practice, it is impossible to
> test *all* Windows versions against ACPI generator changes, even if you
> try to be thorough (which Phil was). One might not even *know about*
> "all" Windows versions. So people using w2k and similar should
> co-maintain the ACPI stuff and report back with testing on the fly;
> otherwise regressions are impossible to avoid.