linux-kernel - Re: [PATCH v2 2/2] arm/arm64: KVM: enable 32 bits kvm vcpu events support

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Date:   Tue, 9 Oct 2018 18:22:52 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Dongjiu Geng <gengdongjiu@...wei.com>, christoffer.dall@....com,
        marc.zyngier@....com, peter.maydell@...aro.org, drjones@...hat.com,
        james.morse@....com, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm/arm64: KVM: enable 32 bits kvm vcpu events
 support



On 08/10/18 13:34, Dongjiu Geng wrote:
> The commit 539aee0edb9f ("KVM: arm64: Share the parts of
> get/set events useful to 32bit") shares the get/set events
> helper for arm64 and arm32, it is better also share the check
> for vcpu events capability to enable 32 bit kvm vcpu events
> support.
> 
> User space will check whether KVM supports vcpu events through
> KVM_CAP_VCPU_EVENTS IOCTL.

nit: User space will check whether KVM supports vcpu events by checking
the KVM_CAP_VCPU_EVENTS extension.

> 
> Cc: James Morse <james.morse@....com>
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>

Reviewed-by : Suzuki K Poulose <suzuki.poulose@....com>

> ---
> For the 32 bits kvm migration, it needs to enable the vcpu events,
> this patch will enable it. The user space QEMU patch is here:
> https://patchwork.ozlabs.org/patch/975615/
> ---
>   arch/arm64/kvm/reset.c | 1 -
>   virt/kvm/arm/arm.c     | 1 +
>   2 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> index fd37c53..e50245e 100644
> --- a/arch/arm64/kvm/reset.c
> +++ b/arch/arm64/kvm/reset.c
> @@ -82,7 +82,6 @@ int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>   		break;
>   	case KVM_CAP_SET_GUEST_DEBUG:
>   	case KVM_CAP_VCPU_ATTRIBUTES:
> -	case KVM_CAP_VCPU_EVENTS:
>   		r = 1;
>   		break;
>   	default:
> diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
> index 40e79ea..64e5d97 100644
> --- a/virt/kvm/arm/arm.c
> +++ b/virt/kvm/arm/arm.c
> @@ -212,6 +212,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>   	case KVM_CAP_READONLY_MEM:
>   	case KVM_CAP_MP_STATE:
>   	case KVM_CAP_IMMEDIATE_EXIT:
> +	case KVM_CAP_VCPU_EVENTS:
>   		r = 1;
>   		break;
>   	case KVM_CAP_ARM_SET_DEVICE_ADDR:
>