linux-kernel - Re: [PATCH v2 22/36] irqchip/gic-v4.1: Advertise support v4.1 to KVM

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Date:   Fri, 1 Nov 2019 20:55:28 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>, <kvmarm@...ts.cs.columbia.edu>,
        <linux-kernel@...r.kernel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Andrew Murray" <Andrew.Murray@....com>,
        Jayachandran C <jnair@...vell.com>,
        "Robert Richter" <rrichter@...vell.com>
Subject: Re: [PATCH v2 22/36] irqchip/gic-v4.1: Advertise support v4.1 to KVM

Hi Marc,

On 2019/10/27 22:42, Marc Zyngier wrote:
> Tell KVM that we support v4.1. Nothing uses this information so far.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>   drivers/irqchip/irq-gic-v3-its.c       | 9 ++++++++-
>   drivers/irqchip/irq-gic-v3.c           | 1 +
>   include/linux/irqchip/arm-gic-common.h | 2 ++
>   3 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index df259e202482..6483f8051b3e 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4580,6 +4580,7 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
>   	struct device_node *of_node;
>   	struct its_node *its;
>   	bool has_v4 = false;
> +	bool has_v4_1 = false;
>   	int err;
>   
>   	gic_rdists = rdists;
> @@ -4600,8 +4601,14 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
>   	if (err)
>   		return err;
>   
> -	list_for_each_entry(its, &its_nodes, entry)
> +	list_for_each_entry(its, &its_nodes, entry) {
>   		has_v4 |= is_v4(its);
> +		has_v4_1 |= is_v4_1(its);
> +	}
> +
> +	/* Don't bother with inconsistent systems */
> +	if (WARN_ON(!has_v4_1 && rdists->has_rvpeid))
> +		rdists->has_rvpeid = false;
>   
>   	if (has_v4 & rdists->has_vlpis) {
>   		if (its_init_vpe_domain() ||
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index f0d33ac64a99..94dddfb21076 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -1758,6 +1758,7 @@ static void __init gic_of_setup_kvm_info(struct device_node *node)
>   		gic_v3_kvm_info.vcpu = r;
>   
>   	gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
> +	gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;

Also set gic_v3_kvm_info.has_v4_1 in gic_acpi_setup_kvm_info().


Thanks,
Zenghui

>   	gic_set_kvm_info(&gic_v3_kvm_info);
>   }
>   
> diff --git a/include/linux/irqchip/arm-gic-common.h b/include/linux/irqchip/arm-gic-common.h
> index b9850f5f1906..fa8c0455c352 100644
> --- a/include/linux/irqchip/arm-gic-common.h
> +++ b/include/linux/irqchip/arm-gic-common.h
> @@ -32,6 +32,8 @@ struct gic_kvm_info {
>   	struct resource vctrl;
>   	/* vlpi support */
>   	bool		has_v4;
> +	/* rvpeid support */
> +	bool		has_v4_1;
>   };
>   
>   const struct gic_kvm_info *gic_get_kvm_info(void);
>