[v1][KVM][PATCH 1/1] kvm:ppc:booehv: direct ISI exception to Guest

[Alexander Graf]

On 09.05.2013, at 14:36, Caraman Mihai Claudiu-B02008 wrote:

>> -----Original Message-----
>> From: tiejun.chen [mailto:tiejun.chen at windriver.com]
>> Sent: Thursday, May 09, 2013 2:40 PM
>> To: Caraman Mihai Claudiu-B02008
>> Cc: Wood Scott-B07421; linuxppc-dev at lists.ozlabs.org; agraf at suse.de; kvm-
>> ppc at vger.kernel.org; kvm at vger.kernel.org
>> Subject: Re: [v1][KVM][PATCH 1/1] kvm:ppc:booehv: direct ISI exception to
>> Guest
>> 
>> On 05/09/2013 07:34 PM, Caraman Mihai Claudiu-B02008 wrote:
>>>>>> VF stands for virtualization fault see MAS8[VF] and we may use it
>> for
>>>> virtualized
>>>> 
>>>> Looks KVM PPC have no this mechanism currently since I don't find
>> MAS8_VF
>>>> is
>>>> used in kernel, right?
>>> 
>>> Yes but 'we may use it' in the feature, I have a functional POC with
>> VF.
>> 
>> Any IO performance to be improved with this POC?
> 
> VF approach puts more stress on HW TLB so I did not advance with performance
> measurements though it may worth to do it.

Could you guys please collect performance data during the next weeks on both guest-directed ISIs as well as VF MMIOs (preferably with in-kernel MMIO), so that we can decide on the direction that's worth going towards?


Thanks!

Alex