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Re: [qemu-s390x] [PATCH v2 11/13] spapr_irq: Allow synchronization of a

From: Cédric Le Goater
Subject: Re: [qemu-s390x] [PATCH v2 11/13] spapr_irq: Allow synchronization of a single irq state to KVM
Date: Mon, 14 Jan 2019 17:29:48 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 1/14/19 4:10 PM, Greg Kurz wrote:
> On Mon, 14 Jan 2019 09:19:50 +0100
> Cédric Le Goater <address@hidden> wrote:
>> On 1/11/19 10:04 PM, Greg Kurz wrote:
>>> When using the in-kernel interrupt controller, the state of all irqs is
>>> synchronized to KVM at machine reset time. In the case of PHB hotplug, we
>>> will need to synchronize LSIs manually.  
>> Yes. This is because the interrupt sources in the KVM XICS device have 
>> already been initialized as MSIs. 
>> Can not we reset the source when it is claimed ? 
>> An alternative solution would be to initialize the SPAPR_IRQ_PCI_LSI range 
>> as LSIs at a KVM level.
> I don't really want to add some dependency to sPAPR code in KVM XICS... what
> about claiming LSIs for all possible PHBs at machine init time ?

you can not claim IRQ numbers twice. So if a new PHB is hot-plugged, 
it will fail the claim its LSIs.


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