Re: [PATCH 0 of 2] Remove --disable-cpu-emulation for qemu

[Anthony Liguori <anthony@codemonkey.ws>]

Avi Kivity wrote:
> Avi Kivity wrote:
>> Jerone Young wrote:
>>> These patches remove all traces of --disable-cpu-emulation 
>>> configuration flag.
>>>
>>>   
>>
>> I kind of like --disable-cpu-emulation.  It means we have the choice 
>> of kvm-only (low footprint, shuts up the security people), qemu-only 
>> (running cross-arch or on older cpu), and mixed mode (I'm a distro 
>> so  don't know what cpu I'm running on).
>>
>> Well, actually, at least Fedora already supplies both plain qemu and 
>> qemu-kvm, so it seems they don't care much about mixed mode.  I'll 
>> look at applying the patches.
>>
>
> Er, that only makes sense with Anthony's idea of a -kvm subtarget 
> thrown in as well.

The -kvm subtarget is really easy to implement.  If anyone is interested 
in doing this, let me know and I'll point them in the right direction.  
The good thing about a -kvm subtarget is that we can introduce a 
CONFIG_KVM_ONLY #define which we can use to compile out l1_phys_map et 
al.  That will give a much better RSS reduction than not linking in 
TCG.  I doubt --disable-cpu-emulation really reduces RSS size an 
observable amount.

Regards,

Anthony Liguori