linux-kernel - Re: [PATCH RESEND v2] KVM: move KVM_CAP_DEVICE

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Date:   Thu, 15 Jun 2023 13:48:42 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Wei Wang <wei.w.wang@...el.com>, seanjc@...gle.com,
        pbonzini@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Wang <wei.w.wang@...el.com>
Subject: Re: [PATCH RESEND v2] KVM: move KVM_CAP_DEVICE_CTRL to the generic
 check

Wei Wang <wei.w.wang@...el.com> writes:

> KVM_CAP_DEVICE_CTRL allows userspace to check if the kvm_device
> framework (e.g. KVM_CREATE_DEVICE) is supported by KVM. Move
> KVM_CAP_DEVICE_CTRL to the generic check for the two reasons:
> 1) it already supports arch agnostic usages (i.e. KVM_DEV_TYPE_VFIO).
> For example, userspace VFIO implementation may needs to create
> KVM_DEV_TYPE_VFIO on x86, riscv, or arm etc. It is simpler to have it
> checked at the generic code than at each arch's code.
> 2) KVM_CREATE_DEVICE has been added to the generic code.
>
> Link: https://lore.kernel.org/all/20221215115207.14784-1-wei.w.wang@intel.com
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
> Reviewed-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/arm64/kvm/arm.c       | 1 -
>  arch/powerpc/kvm/powerpc.c | 1 -

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers