Re: KVM/ia64 > 3GB or RAM?

[Jes Sorensen <jes@sgi.com>]

Zhang, Xiantao wrote:
> Hi, Jes
> 	Seems I missed some mails from kvm/ia64 list, because my mailing
> address is unsubscribed by unknow reason days ago. For guest's physical
> address space,  0-3G is conventional ram, 3G-3.5G is allocated for mmio
> address sapce. 4G- higher address is also ram. The memory size is
> transferred to firmware at creating guest time.  In firmware, it also
> has the knowledge about guest memory layout from memory size, so it will
> know where is ram and where is mmio...   I have a fix about this issue,
> and you should can get it in mailing list. :)
> Thanks
> Xiantao

Hi Xiantao,

Hmmm I didn't realize this was hardcoded into the firmware image :-(
at least that explains why changing the addresses fails so badly.

I still have major problems with more than 3GB of memory though, the
guest gets memory corruption and crashes fast. It happens as soon as
anything is mapped above 4GB, as little as 2MB extra is enough to break
it.

Cheers,
Jes