Re: VGA address mapping?

[Gleb Natapov <gleb@redhat.com>]

On Tue, Jul 21, 2009 at 04:06:10PM -0700, Saksena, Abhishek wrote:
> Would also like to mention I am not using Qemu and building some basic IO models around KVM (only using libkvm.h)
> 
> -Abhishek
> ________________________________
> From: Saksena, Abhishek
> Sent: Tuesday, July 21, 2009 11:13 AM
> To: kvm@vger.kernel.org
> Subject: VGA address mapping?
> 
> Hi
> I am implementing a VGA Device model. The model provides functions to read/write VGA memory space.
> 
> Just for testing I want to capture memory reads/writes to addresses 0xA0000->0xC0000 and forward it to my VGA model.
> 
> 
> I have used following function to create physical ram
> 
> int kvm_create  (       kvm_context_t<file:///C:/Documents%20and%20Settings/asaksena/Desktop/march_onwards/kvmsocket/doc/htmlkvm/structkvm__context.html>       kvm,
>                 unsigned long   phys_mem_bytes,
>                 void **         phys_mem
>         )
> 
> The function comments says that this creates a new virtual machine, maps physical RAM to it, and creates a virtual CPU for it. Memory gets mapped for addresses 0->0xA0000, 0xC0000->phys_mem_bytes.
> 
This indeed what comment says, but looking at the code I don't see it
using phys_mem_bytes/phys_mem parameters at all.

Look at QEMU code how memory is created.
> 
> 
> I was expecting mimio read/write callbacks to capture transactions between 0xA0000->0xC0000  but I don't see that happening.
> 
> 
> 
> My question is how I can configure KVM to forward me reads/writes for VGA address space?
> 
> 
> 
> 
> 
> Thanks
> 
> Abhishek
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--
			Gleb.