Re: [PATCH -v2] Monitor command: pfa2hva, translate guest physical address to host virtual address

[Huang Ying <ying.huang@intel.com>]

On Mon, 2010-11-08 at 11:39 +0800, Anthony Liguori wrote:
> On 11/07/2010 07:29 PM, Huang Ying wrote:
> > On Sun, 2010-11-07 at 00:24 +0800, Avi Kivity wrote:
> >    
> >> On 11/01/2010 03:22 PM, Anthony Liguori wrote:
> >>      
> >>> On 11/01/2010 02:20 PM, Huang Ying wrote:
> >>>        
> >>>> Yes. As general interface, it may not work so well, but as test
> >>>> interface, it works quite well and useful.
> >>>>
> >>>> Do we have any mechanism to add a test only interface?
> >>>>          
> >>> I'd like to see what Luiz/Markus think but definitely only a human
> >>> monitor interface and probably prefix the command with a 'x-' prefix
> >>> to indicate that it's not a supported interface.
> >>>
> >>>        
> >> Automated testing will want to use qmp.
> >>      
> > Yes. The main usage of the interface is automated testing.
> >    
> 
> That's precisely what the command should not be used for.
> 
> You can't assume a gpa -> hva mapping is consistent in an external 
> application.  If you want to implement an interface for testing, you 
> have to push more of the logic into QEMU to avoid the race.

>From the code of cpu_physical_memory_map(), it seems that if the 'addr'
is physical address in RAM, the mapping should be consistent at least
for x86, doesn't it?

Best Regards,
Huang Ying