linux-kernel - Re: [PATCH v2 10/10] KVM: arm/arm64: vgic-its: Implement KVM_DEV_ARM_ITS_CTRL

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Message-ID: <20171013154050.GM8927@cbox>
Date:   Fri, 13 Oct 2017 17:40:50 +0200
From:   Christoffer Dall <cdall@...aro.org>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, marc.zyngier@....com,
        peter.maydell@...aro.org, andre.przywara@....com,
        wanghaibin.wang@...wei.com, wu.wubin@...wei.com
Subject: Re: [PATCH v2 10/10] KVM: arm/arm64: vgic-its: Implement
 KVM_DEV_ARM_ITS_CTRL_RESET

On Wed, Sep 27, 2017 at 03:28:40PM +0200, Eric Auger wrote:
> On reset we clear the valid bits of GITS_CBASER and GITS_BASER<n>.
> We also clear command queue registers and free the device,
> collection and lpi lists.

            , and lpi lists.

(https://imgur.com/gallery/fycHx for your amusemnt)


Otherwise:

Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>
> 
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> ---
>  arch/arm/include/uapi/asm/kvm.h   |  1 +
>  arch/arm64/include/uapi/asm/kvm.h |  1 +
>  virt/kvm/arm/vgic/vgic-its.c      | 18 ++++++++++++++++++
>  3 files changed, 20 insertions(+)
> 
> diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
> index 5db2d4c..7ef0c06 100644
> --- a/arch/arm/include/uapi/asm/kvm.h
> +++ b/arch/arm/include/uapi/asm/kvm.h
> @@ -215,6 +215,7 @@ struct kvm_arch_memory_slot {
>  #define   KVM_DEV_ARM_ITS_SAVE_TABLES		1
>  #define   KVM_DEV_ARM_ITS_RESTORE_TABLES	2
>  #define   KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES	3
> +#define   KVM_DEV_ARM_ITS_CTRL_RESET		4
>  
>  /* KVM_IRQ_LINE irq field index values */
>  #define KVM_ARM_IRQ_TYPE_SHIFT		24
> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
> index 9f3ca24..b5306ce 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -227,6 +227,7 @@ struct kvm_arch_memory_slot {
>  #define   KVM_DEV_ARM_ITS_SAVE_TABLES           1
>  #define   KVM_DEV_ARM_ITS_RESTORE_TABLES        2
>  #define   KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES	3
> +#define   KVM_DEV_ARM_ITS_CTRL_RESET		4
>  
>  /* Device Control API on vcpu fd */
>  #define KVM_ARM_VCPU_PMU_V3_CTRL	0
> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
> index eaefba2..fa18946 100644
> --- a/virt/kvm/arm/vgic/vgic-its.c
> +++ b/virt/kvm/arm/vgic/vgic-its.c
> @@ -2380,6 +2380,19 @@ static int vgic_its_commit_v0(struct vgic_its *its)
>  	return 0;
>  }
>  
> +static void vgic_its_reset(struct kvm *kvm, struct vgic_its *its)
> +{
> +	/* We need to keep the ABI specific field values */
> +	its->baser_coll_table &= ~GITS_BASER_VALID;
> +	its->baser_device_table &= ~GITS_BASER_VALID;
> +	its->cbaser = 0;
> +	its->creadr = 0;
> +	its->cwriter = 0;
> +	its->enabled = 0;
> +	vgic_its_free_device_list(kvm, its);
> +	vgic_its_free_collection_list(kvm, its);
> +}
> +
>  static int vgic_its_has_attr(struct kvm_device *dev,
>  			     struct kvm_device_attr *attr)
>  {
> @@ -2394,6 +2407,8 @@ static int vgic_its_has_attr(struct kvm_device *dev,
>  		switch (attr->attr) {
>  		case KVM_DEV_ARM_VGIC_CTRL_INIT:
>  			return 0;
> +		case KVM_DEV_ARM_ITS_CTRL_RESET:
> +			return 0;
>  		case KVM_DEV_ARM_ITS_SAVE_TABLES:
>  			return 0;
>  		case KVM_DEV_ARM_ITS_RESTORE_TABLES:
> @@ -2438,6 +2453,9 @@ static int vgic_its_set_attr(struct kvm_device *dev,
>  		case KVM_DEV_ARM_VGIC_CTRL_INIT:
>  			/* Nothing to do */
>  			return 0;
> +		case KVM_DEV_ARM_ITS_CTRL_RESET:
> +			vgic_its_reset(dev->kvm, its);
> +			return 0;
>  		case KVM_DEV_ARM_ITS_SAVE_TABLES:
>  			return abi->save_tables(its);
>  		case KVM_DEV_ARM_ITS_RESTORE_TABLES:
> -- 
> 2.5.5
>