[PATCH v5 00/16] KVM: PPC: Book3S HV: add XIVE native exploitation mode

[Cédric Le Goater]

Hello Satheesh,

On 4/29/19 10:05 AM, Satheesh Rajendran wrote:
> On Wed, Apr 10, 2019 at 07:04:32PM +0200, Cédric Le Goater wrote:
>> Hello,
>>
>> GitHub trees available here :
>>
>> QEMU sPAPR:
>>
>>   https://github.com/legoater/qemu/commits/xive-next
>>   
>> Linux/KVM:
>>
>>   https://github.com/legoater/linux/commits/xive-5.1
> 
> Hi,
> 
> Xive(both ic-mode=dual and ic-mode=xive) guest fails to boot with 
> guest memory > 64G, till 64G it boots fine.
>
> Note: xics(ic-mode=xics) guest with the same configuration boots fine

Indeed. The guest hangs because IPIs are not correctly received. The guest 
sees the EQ page as being filled with zeroes and discards the interrupt 
whereas the host, KVM and QEMU, sees the correct entries.

I haven't spotted anything bizarre from guest side. Do we have a 64GB 
frontier somewhere in KVM ? 

Thanks,

C.