Re: [Qemu-devel] problem using AHCI on xen fvm

[Stefano Stabellini]

I am glad it worked.

Cheers,

Stefano

On Fri, 20 Jun 2014, Zhang, Eniac wrote:
> Hi Stefano,
> 
> You are a genius.   Qemu2.0.0 works fine with my AHCI hack.  
> 
> Then I took a look at the patch.  That fix is exactly what's missing in qemu 
> 1.6.1.  I ported back that one fix and all is working now.  I am running full 
> test now to make sure that's the right thing to do.  
> 
> Thanks for the help/Eniac
> 
> 
> > # test with vanilla-xen
> > 
> > Qemu-1.6.1-vanilla with 440fx chipset: no corruption
> > 
> > Qemu-1.6.1 with AHCI patch and 440fx chipset: corruption
> 
> Can you try with a more recent QEMU version? Maybe QEMU 2.0?
> 
> 
> > So the problem lies between the interaction between AHCI controller 
> > and xen.  Has anyone else tried this and/or can take a look to see what’s 
> > happening here?
> 
> In these cases it is usually a mapcache (see xen-mapcache.c) problem.
> Not a bug in the mapcache per se, but maybe it is not called correctly from 
> common code. To give you an idea of a possible bad interaction between the 
> mapcache and common code, see:
> 
> commit a41087bc7110e8378cd49ddd06aa7c9d361f3673
> Author: Stefano Stabellini <address@hidden>
> Date:   Thu Jan 30 12:46:05 2014 +0000
> 
>     address_space_translate: do not cross page boundaries
>