From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shanker Donthineni <shankerd@codeaurora.org>
Subject: Re: [PATCH v5 6/9] irqchip/gic-v3: Parse and export virtual GIC
 information
Date: Mon, 11 Apr 2016 10:25:33 -0500
Message-ID: <570BC1ED.9080200@codeaurora.org>
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Cc: al.stone@linaro.org, kvm@vger.kernel.org, marc.zyngier@arm.com,
 linux-kernel@vger.kernel.org, gg@slimlogic.co.uk,
 linux-arm-kernel@lists.infradead.org, Thomas Gleixner <tglx@linutronix.de>,
 fu.wei@linaro.org, Jason Cooper <jason@lakedaemon.net>
To: Julien Grall <julien.grall@arm.com>, Hanjun Guo <hanjun.guo@linaro.org>,
 kvmarm@lists.cs.columbia.edu
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Hi Julien,

On 04/11/2016 09:27 AM, Julien Grall wrote:
> Hello Hanjun,
>
> On 11/04/16 06:27, Hanjun Guo wrote:
>> On 2016/4/4 19:37, Julien Grall wrote:
>>> +static void __init gic_acpi_setup_kvm_info(void)
>>> +{
>>> +    int irq;
>>> +
>>> +    if (!gic_acpi_collect_virt_info()) {
>>> +        pr_warn("Unable to get hardware information used for
>>> virtualization\n");
>>> +        return;
>>> +    }
>>> +
>>> +    gic_v3_kvm_info.type = GIC_V3;
>>> +
>>> +    irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
>>> +                acpi_data.maint_irq_mode,
>>> +                ACPI_ACTIVE_HIGH);
>>> +    if (irq <= 0)
>>> +        return;
>>> +
>>> +    gic_v3_kvm_info.maint_irq = irq;
>>> +
>>> +    if (acpi_data.vcpu_base) {
>>
>> Sorry, I'm not familiar with KVM, but I got a question here, will
>> KVM works without valid vcpu_base in GICv3 mode?
>
Yes, KVM works without vcpu_base in GICv3 mode. The vcpu_base will be used
for emulatingvGICv2 feature. The vGICv3 emulation isdone through the
system registers.

> vcpu_base is only required for supporting GICv2 on GICv3.
>
Yes, you are right,

> Regards,
>

-- 
Shanker Donthineni
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project