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Re: [Qemu-devel] [Xen-devel] [BUG 1747]Guest could't find bootable devic

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [Xen-devel] [BUG 1747]Guest could't find bootable device with memory more than 3600M
Date: Wed, 12 Jun 2013 10:02:52 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 12/06/2013 09:49, Jan Beulich ha scritto:
>> #3 should be possible or even the default (would need to check), but #4
>> is probably a bit harder to do.  Perhaps you can use a magic I/O port
>> for the xen platform PV driver, but if you can simply use two PCI
>> windows it would be much simpler because that's the same that TCG and
>> KVM already do.  The code is all there for you to lift in SeaBIOS.
> What is the connection here to the platform PV driver?

It's just a hook you already have for Xen-specific stuff in QEMU.

>> Only Windows XP and older had problems with that because they didn't
>> like something in the ASL; but the 64-bit window is placed at the end of
>> RAM, so in principle any PAE-enabled OS can use it.
> At the end of _RAM_???

Why the question marks? :)

If you have 4GB of RAM it will end at 0x140000000 (or something like
that) and that's where the 64-bit window starts.  Of course if you have
no RAM above the PCI hole, the 64-bit window will start at 0x100000000.


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