Re: [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM

[David Woodhouse]

On Mon, 2013-02-18 at 19:16 +0100, Laszlo Ersek wrote:
> On 02/18/13 18:45, Gleb Natapov wrote:
> > On Mon, Feb 18, 2013 at 06:12:55PM +0100, Laszlo Ersek wrote:
> > > CS =f000 000f0000 0000ffff 0000f300
> > >     ^    ^        ^        ^
> > >     |    base     limit    flags
> > >     selector
> >
> > This is because real mode is emulated as vm86 mode on intel cpus without
> > "unrestricted guest" flag.
>
> Awesome, this supports mys desperate hunch in
> http://lists.nongnu.org/archive/html/qemu-devel/2013-02/msg02689.html.
> I hope David can confirm in practice!

Yes, my working machines have unrestricted_guest support, and the
non-working machines don't. So when we're emulating it in vm86, the
extended segment base handling is broken.