linux-kernel - Re: [PATCH v5 06/23] irqchip/gic-v4.1: Advertise support v4.1 to KVM

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Message-ID: <12d3a655-1caf-39c0-7d80-f43b0d90677c@redhat.com>
Date:   Mon, 16 Mar 2020 18:10:23 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Robert Richter <rrichter@...vell.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Zenghui Yu <yuzenghui@...wei.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v5 06/23] irqchip/gic-v4.1: Advertise support v4.1 to KVM

Hi Marc,

On 3/4/20 9:33 PM, Marc Zyngier wrote:
> Tell KVM that we support v4.1. Nothing uses this information so far.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric

> ---
>  drivers/irqchip/irq-gic-v3-its.c       | 9 ++++++++-
>  drivers/irqchip/irq-gic-v3.c           | 2 ++
>  include/linux/irqchip/arm-gic-common.h | 2 ++
>  3 files changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index fc5788584df7..bcc1a0957cda 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4870,6 +4870,7 @@ 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;
> @@ -4890,8 +4891,14 @@ 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 ba405becab53..03e4eadefb00 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -1785,6 +1785,7 @@ 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;
>  	gic_set_kvm_info(&gic_v3_kvm_info);
>  }
>  
> @@ -2100,6 +2101,7 @@ static void __init gic_acpi_setup_kvm_info(void)
>  	}
>  
>  	gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
> +	gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
>  	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);
>