Re: [Qemu-devel] [PATCH] pseries: Support for in-kernel XICS interrupt controller

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 06/06/2013 05:41 PM, David Gibson wrote:
> On Wed, Jun 05, 2013 at 05:39:58PM +1000, Alexey Kardashevskiy wrote:
>> From: David Gibson <david@gibson.dropbear.id.au>
>>
>> Recent (host) kernels support emulating the PAPR defined "XICS" interrupt
>> controller system within KVM.  This patch allows qemu to initialize and
>> configure the in-kernel XICS, and keep its state in sync with qemu's XICS
>> state as necessary.
>>
>> This should give considerable performance improvements.  e.g. on a simple
>> IPI ping-pong test between hardware threads, using qemu XICS gives us
>> around 5,000 irqs/second, whereas the in-kernel XICS gives us around
>> 70,000 irqs/s on the same hardware configuration.
>>
>> [Mike Qiu <qiudayu@linux.vnet.ibm.com>: fixed mistype which caused ics_set_kvm_state() to fail]
>> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> 
> I think this one also needs the headers update for qemu first, yes?

Yes, my bad, I sent headers patch + one patch which Scott Wood already posted.



-- 
Alexey