Re: [Qemu-devel] [Xen-devel] [BUG 1747]Guest could't find bootable device with memory more than 3600M

[Jan Beulich]

>>> On 12.06.13 at 13:23, Ian Campbell <address@hidden> wrote:
> On Wed, 2013-06-12 at 11:07 +0100, Jan Beulich wrote:
>> As there's no accessible guest kernel command for HVM guests,
>> did you mean to require the guest admin to put something on the
>> command line manually?
> 
> Yes, as a workaround for this shortcoming of 4.3, not as a long term
> solution. It's only people using passthrough with certain devices with
> large BARs who will ever trip over this, right?

Yes.

>> And then - this might cover Linux, but what about other OSes,
>> namely Windows?
> 
> True, I'm not sure if/how this can be done.
> 
> The only reference I could find was at
> http://windows.microsoft.com/en-id/windows7/using-system-configuration 
> which says under "Advanced boot options":
>         PCI Lock. Prevents Windows from reallocating I/O and IRQ
>         resources on the PCI bus. The I/O and memory resources set by
>         the BIOS are preserved.
> 
> Which seems to suggest the default is to reallocate, but I don't know.

Without having known of this option, I would take it as "may", not
"will" reallocate.

Jan