linux-kernel - Re: [PATCH v3 10/12] KVM: arm/arm64: Add KVM_VGIC_V3_ADDR_TYPE_REDIST

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Date:   Tue, 24 Apr 2018 23:08:21 +0200
From:   Christoffer Dall <christoffer.dall@....com>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        marc.zyngier@....com, cdall@...nel.org, peter.maydell@...aro.org,
        andre.przywara@....com, drjones@...hat.com, wei@...hat.com
Subject: Re: [PATCH v3 10/12] KVM: arm/arm64: Add
 KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION

On Fri, Apr 13, 2018 at 10:20:56AM +0200, Eric Auger wrote:
> This new attribute allows the userspace to set the base address
> of a reditributor region, relaxing the constraint of having all
> consecutive redistibutor frames contiguous.
> 
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> ---
>  arch/arm/include/uapi/asm/kvm.h   | 7 ++++---
>  arch/arm64/include/uapi/asm/kvm.h | 7 ++++---
>  2 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
> index 2ba95d6..11725bb 100644
> --- a/arch/arm/include/uapi/asm/kvm.h
> +++ b/arch/arm/include/uapi/asm/kvm.h
> @@ -88,9 +88,10 @@ struct kvm_regs {
>  #define KVM_VGIC_V2_CPU_SIZE		0x2000
>  
>  /* Supported VGICv3 address types  */
> -#define KVM_VGIC_V3_ADDR_TYPE_DIST	2
> -#define KVM_VGIC_V3_ADDR_TYPE_REDIST	3
> -#define KVM_VGIC_ITS_ADDR_TYPE		4
> +#define KVM_VGIC_V3_ADDR_TYPE_DIST		2
> +#define KVM_VGIC_V3_ADDR_TYPE_REDIST		3
> +#define KVM_VGIC_ITS_ADDR_TYPE			4

I think I'd prefer that we just leave these lines above as it's only and
indentation thing, and this is an exported header so will propagate into
userspace updates, but I don't have a strong feeling about it, nor do I
know if there's a general policy.

> +#define KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION	5
>  
>  #define KVM_VGIC_V3_DIST_SIZE		SZ_64K
>  #define KVM_VGIC_V3_REDIST_SIZE		(2 * SZ_64K)
> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
> index 9abbf30..ef8ad3b 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -88,9 +88,10 @@ struct kvm_regs {
>  #define KVM_VGIC_V2_CPU_SIZE		0x2000
>  
>  /* Supported VGICv3 address types  */
> -#define KVM_VGIC_V3_ADDR_TYPE_DIST	2
> -#define KVM_VGIC_V3_ADDR_TYPE_REDIST	3
> -#define KVM_VGIC_ITS_ADDR_TYPE		4
> +#define KVM_VGIC_V3_ADDR_TYPE_DIST		2
> +#define KVM_VGIC_V3_ADDR_TYPE_REDIST		3
> +#define KVM_VGIC_ITS_ADDR_TYPE			4
> +#define KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION	5
>  
>  #define KVM_VGIC_V3_DIST_SIZE		SZ_64K
>  #define KVM_VGIC_V3_REDIST_SIZE		(2 * SZ_64K)
> -- 
> 2.5.5
> 

Otherwise:

Acked-by: Christoffer Dall <christoffer.dall@....com>