Support for more than 2GB RAM in guests.

Support for more than 2GB RAM in guests.

[Kiselev, Sergey]

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Hi,
 
Any plans to add support for guests with more than 2GB RAM?
 
I tried to fix obvious limitations, e.g. to change ram_size and
phys_ram_size variables from 'int' to 'unsigned long' type.
Now I am getting 'init_rmode_tss: gfn_to_page failed' error from KVM, so
probably KVM kernel module needs to be fixed also.
 
Thanks,
Sergey
 

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Re: Support for more than 2GB RAM in guests.

[Avi Kivity]

Kiselev, Sergey wrote:
> Hi,
>  
> Any plans to add support for guests with more than 2GB RAM?

No immediate plans, but of course I'd like to have that limitation lifted.

>  
> I tried to fix obvious limitations, e.g. to change ram_size and 
> phys_ram_size variables from 'int' to 'unsigned long' type.
> Now I am getting 'init_rmode_tss: gfn_to_page failed' error from KVM, 
> so probably KVM kernel module needs to be fixed also.

I'd expect kvm to be 64-bit clean (esp. with a 64-bit host).  Did you 
check in kvmctl.c whether the memory slot created was actually > 2GB?  
Maybe there are further places in qemu/libkvm that need fixing.


>  
> Thanks,
> Sergey
>  
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-- 
error compiling committee.c: too many arguments to function


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Re: Support for more than 2GB RAM in guests.

[Kiselev, Sergey]

It seems that this particular error was caused by return value of
rmode_tss_base() being 'int'.
There are a lot of places in qemu where 'int' variables are used for
addresses. Even after fixing these, I have some problems, probably
because conflicts of PCI memory I/O space with RAM.

Thanks,
Sergey

-----Original Message-----
From: Avi Kivity [mailto:avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org] 
Sent: 18 April 2007 19:12
To: Kiselev, Sergey
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [kvm-devel] Support for more than 2GB RAM in guests.

Kiselev, Sergey wrote:
> Hi,
>  
> Any plans to add support for guests with more than 2GB RAM?

No immediate plans, but of course I'd like to have that limitation
lifted.

>  
> I tried to fix obvious limitations, e.g. to change ram_size and 
> phys_ram_size variables from 'int' to 'unsigned long' type.
> Now I am getting 'init_rmode_tss: gfn_to_page failed' error from KVM, 
> so probably KVM kernel module needs to be fixed also.

I'd expect kvm to be 64-bit clean (esp. with a 64-bit host).  Did you 
check in kvmctl.c whether the memory slot created was actually > 2GB?  
Maybe there are further places in qemu/libkvm that need fixing.


>  
> Thanks,
> Sergey
>  
>
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-- 
error compiling committee.c: too many arguments to function

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