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Re: [Qemu-devel] [PATCH v2] Add virt-v3 machine that uses GIC-500

From: Pavel Fedin
Subject: Re: [Qemu-devel] [PATCH v2] Add virt-v3 machine that uses GIC-500
Date: Thu, 14 May 2015 18:27:02 +0300


> I wonder how it works for you. Do you aware of an alternative way to 
> configure the clock
> irqflags for more then 24 cores, or is it just ignored.

 Unfortunately i don't know how it works. 

> My current status is as follows:
> With 64 cores there is no printouts what so ever.
> With 32 cores the boot usually get stuck after the message "[   45.719102] 
> initialized"
> With 24 cores the system noontimes complete the boot and sometimes get stuck 
> like the 32
> cores system.

 I will recheck later when i get back to qemu. I will pull the latest HEAD and 
fix IRQ
affinity specification. But, i think that most likely you'll have to debug this 
Because i suggest it will work. :)

>>  Yes, i just left it as it was because it already works fine with ARM64. 
>> Actually,
>> TYPE_AARCH64_CPU is a subclass of TYPE_ARM_CPU.
> I see but I guess that I want aarch64_cpu_initfn to be called and not 
> arm_cpu_initfn.

 I guess that the correct class will be returned. Otherwise it would not work 
at all. You
can check this if you want to.

>>  BTW, just for interest, have you tried to do anything with KVM support of 
>> vGICv3? I
>> some code but it's inherently unstable and lock up for unknown (yet) reason.
> No, this is because I don't have an ARM64 based server needed for running KVM 
> for ARM64.

 Ok. Then it looks like i'm going to be the first to do this. I hope you'll 
complete the
integration soon because vGICv3 has to be based upon your work.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

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