Re: [Qemu-devel] [Spice-devel] viewing continuous guest virtual memory as continuous in qemu

[Alon Levy]

On Sun, Oct 02, 2011 at 03:24:36PM +0200, Alon Levy wrote:
> Hi,
> 

Converting qemu's ram allocation to a mmap and using remap_file_pages seems
like it could work. Any ideas why it wouldn't?

Alon

>  I'm trying to acheive the $subject. Some background: currently spice relies 
> on a preallocated pci bar for both surfaces and for VGA framebuffer + 
> commands. I have been trying to get rid of the surfaces bar. To do that I 
> allocate memory in the guest and then translate it for spice-server 
> consumption using cpu_physical_memory_map.
> 
>  AFAIU this works only when the guest allocates a continuous range of 
> physical pages. This is a large requirement from the guest, which I'd like to 
> drop. So I would like to have the guest use a regular allocator, generating 
> for instance two sequential pages in virtual memory that are scattered in 
> physical memory. Those two physical guest page addresses (gp1 and gp2) 
> correspond to two host virtual memory addresses (hv1, hv2). I would now like 
> to provide to spice-server a single virtual address p that maps to those two 
> pages in sequence. I don't want to handle my own scatter-gather list, I would 
> like to have this mapping done once so I can use an existing library that 
> requires a single pointer (for instance pixman or libGL) to do the rendering.
> 
>  Is there any way to acheive that without host kernel support, in user space, 
> i.e. in qemu? or with an existing host kernel device?
> 
>  I'd appreciate any help,
> 
> Alon
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