Re: [Qemu-devel] [PATCH V4 4/4] target-i386: add i440fx 0xcf8portascoalesced_pio

[peng.hao2]

>On Mon, Aug 27, 2018 at 11:17:49PM +0800, address@hidden wrote:
>> >On Mon, Aug 27, 2018 at 04:25:00PM +0800, address@hidden wrote:

>> >> >
>> >> >Is there a reason to not register this port as coalesced PIO also for 
>> >> >Q35?
>> >> >In q35_host_realize()?
>> >> >If not, I would do that as an extra patch as part of this series.
>> >> Just as I mentioned in patch [0/4] , you can add pci-
>>>>host config port as coalesecd pio. I think  it works for q35 port 0xcf8.
>> >> >-Liran
>> >
>> >What's the performance improvement for q35?
>> q35 also has  the same pci-host config port 0xcf8  as  piix. I test the 
>> coalesced pio for 
>> q35 pci-host config port 0xcf8. It spent less VM-exit avg time from 3us to 
>> 0.6us.

>so pls include that patch too. piix is mostly feature frozen, piix only
>features aren't likely to be merged.
Hi, Liran，do you want to add the patch about q35 ?