linux-kernel - Re: [PATCH 7/9] KVM: arm64: Simplify argument passing to vgic_uaccess

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Date:   Tue, 12 Jan 2021 16:04:24 +0000
From:   Alexandru Elisei <alexandru.elisei@....com>
To:     Eric Auger <eric.auger@...hat.com>, eric.auger.pro@...il.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, maz@...nel.org, drjones@...hat.com
Cc:     james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, shuah@...nel.org, pbonzini@...hat.com
Subject: Re: [PATCH 7/9] KVM: arm64: Simplify argument passing to
 vgic_uaccess_[read|write]

Hi Eric,

On 12/12/20 6:50 PM, Eric Auger wrote:
> Instead of converting the vgic_io_device handle to a kvm_io_device
> handled and then do the oppositive, pass a vgic_io_device pointer all
> along the call chain.

To me, it looks like the commit message describes what the patch does instead of
why it does it.

What are "vgic_io_device handle" and "kvm_io_device handled"?

Thanks,
Alex
>
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> ---
>  arch/arm64/kvm/vgic/vgic-mmio.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/kvm/vgic/vgic-mmio.c b/arch/arm64/kvm/vgic/vgic-mmio.c
> index b2d73fc0d1ef..48c6067fc5ec 100644
> --- a/arch/arm64/kvm/vgic/vgic-mmio.c
> +++ b/arch/arm64/kvm/vgic/vgic-mmio.c
> @@ -938,10 +938,9 @@ vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
>  	return region;
>  }
>  
> -static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
> +static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
>  			     gpa_t addr, u32 *val)
>  {
> -	struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
>  	const struct vgic_register_region *region;
>  	struct kvm_vcpu *r_vcpu;
>  
> @@ -960,10 +959,9 @@ static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
>  	return 0;
>  }
>  
> -static int vgic_uaccess_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
> +static int vgic_uaccess_write(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
>  			      gpa_t addr, const u32 *val)
>  {
> -	struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
>  	const struct vgic_register_region *region;
>  	struct kvm_vcpu *r_vcpu;
>  
> @@ -986,9 +984,9 @@ int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
>  		 bool is_write, int offset, u32 *val)
>  {
>  	if (is_write)
> -		return vgic_uaccess_write(vcpu, &dev->dev, offset, val);
> +		return vgic_uaccess_write(vcpu, dev, offset, val);
>  	else
> -		return vgic_uaccess_read(vcpu, &dev->dev, offset, val);
> +		return vgic_uaccess_read(vcpu, dev, offset, val);
>  }
>  
>  static int dispatch_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,