Re: Allocating Extra Memory To Guest

[Avi Kivity <avi@redhat.com>]

Kumar, Venkat wrote:
> Kumar, Venkat wrote:
>   
>> Hi,
>>
>> 1. How should we allocate extra memory to guest other than memory allocated through "qemu_alloc_physram"??
>>   
>>     
>
> qemu_alloc_physram() is obsolete.  I've just removed it to avoid 
> confusion (and a warning).
>
> ==> 
> If kvm-85 is the latest version, I still see "qemu_alloc_physram" invoked to allocate memory. This piece of code is in qemu/vl.c.
>   

The really latest version is in git.  See 
http://www.linux-kvm.org/page/Code.


> I presume you want to give kvm memory which is not real RAM - from a 
> host device?
> hw/device-assignment.c does that.
>
> Please clarify what you want to do.
>
> ==> 
> I want to allocate extra RAM for the guest apart from memory allocated through "qemu_alloc_physram". Let's assume that I have allocated some RAM for guest through "qemu_alloc_physram" call and some more memory through "malloc or mmap", how will I register these two virtually discontinuous memory regions with KVM?
>   

You can use qemu_ram_alloc() and cpu_register_physical_memory().

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.