Re: [Qemu-devel] [PATCH] pc: limit 64 bit hole to 2G by default

[Gerd Hoffmann]

On 07/24/13 08:01, Michael S. Tsirkin wrote:
> It turns out that some 32 bit windows guests crash
> if 64 bit PCI hole size is >2G.

Ah, *that* is the reason for winxp crashing with a 64bit hole.

Current seabios uses a slightly different approach: the 64bit hole is
present only in case it is actually used to map bars there, and seabios
tries to fit everything into the 32bit hole first.

> Limit it to 2G for piix and q35 by default,
> add properties to let management override the hole size.
> 
> Examples:
> -global i440FX-pcihost.pci_hole64_size=137438953472

Do we really want specify this in bytes?  Using megabytes or gigabytes
instead looks more sane to me.

cheers,
  Gerd