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Date: Wed, 13 Apr 2016 18:11:08 +0800 From: Hanjun Guo <hanjun.guo@...aro.org> To: Shanker Donthineni <shankerd@...eaurora.org>, Julien Grall <julien.grall@....com>, kvmarm@...ts.cs.columbia.edu Cc: al.stone@...aro.org, kvm@...r.kernel.org, marc.zyngier@....com, linux-kernel@...r.kernel.org, fu.wei@...aro.org, Thomas Gleixner <tglx@...utronix.de>, Jason Cooper <jason@...edaemon.net>, linux-arm-kernel@...ts.infradead.org, gg@...mlogic.co.uk Subject: Re: [PATCH v5 6/9] irqchip/gic-v3: Parse and export virtual GIC information Hi Shanker, Julien, On 2016/4/11 23:25, Shanker Donthineni wrote: > 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, Thanks for the clarify. Hanjun
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