linux-kernel - Re: [PATCH v3 6/9] irqchip/gic-v3: Parse and export virtual GIC information

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Date:	Tue, 22 Mar 2016 12:02:29 +0000
From:	Julien Grall <julien.grall@....com>
To:	Graeme Gregory <gg@...mlogic.co.uk>
Cc:	wei@...hat.com, al.stone@...aro.org, kvm@...r.kernel.org,
	marc.zyngier@....com, Jason Cooper <jason@...edaemon.net>,
	linux-kernel@...r.kernel.org, fu.wei@...aro.org,
	Thomas Gleixner <tglx@...utronix.de>,
	kvmarm@...ts.cs.columbia.edu, christoffer.dall@...aro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 6/9] irqchip/gic-v3: Parse and export virtual GIC
 information

Hi Graeme,

On 22/03/16 11:27, Graeme Gregory wrote:
> On Tue, Mar 08, 2016 at 11:29:30AM +0000, Julien Grall wrote:
>> @@ -1020,6 +1060,13 @@ gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header,
>>   		return -ENOMEM;
>>
>>   	gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
>> +
>> +	acpi_data.maint_irq = gicc->vgic_interrupt;
>> +	acpi_data.maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
>> +				    ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
>> +	acpi_data.vctrl_base = gicc->gich_base_address;
>> +	acpi_data.vcpu_base = gicc->gicv_base_address;
>> +
>>   	return 0;
>>   }
>
> Placing this here means that it will not collect the info in the case
> where there is a Generic Interrupt Redistributor structure in the MADT.
>
> I guess collecting this info should not be a side effect of happening to
> pass GICC for redistributor base. Which unfortuneately probably means we
> do need to parse the GICCs specifically for this information.

I noticed it while testing on some platform. It's now fixed and will be 
in the next version.

Regards,

-- 
Julien Grall