linux-kernel - Re: [PATCH 6/9] docs: kvm: devices/arm-vgic-v3: enhance KVM_DEV_ARM_VGIC_CTRL

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Message-ID: <4c0b3988-904c-a922-d0be-87a354c3203c@arm.com>
Date:   Tue, 12 Jan 2021 15:39:46 +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 6/9] docs: kvm: devices/arm-vgic-v3: enhance
 KVM_DEV_ARM_VGIC_CTRL_INIT doc

Hi Eric,

On 12/12/20 6:50 PM, Eric Auger wrote:
> kvm_arch_vcpu_precreate() returns -EBUSY if the vgic is
> already initialized. So let's document that KVM_DEV_ARM_VGIC_CTRL_INIT
> must be called after all vcpu creations.

Checked and this is indeed the case,
kvm_vm_ioctl_create_vcpu()->kvm_arch_vcpu_precreate() returns -EBUSY is
vgic_initialized() is true.

>
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> ---
>  Documentation/virt/kvm/devices/arm-vgic-v3.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Documentation/virt/kvm/devices/arm-vgic-v3.rst b/Documentation/virt/kvm/devices/arm-vgic-v3.rst
> index 5dd3bff51978..322de6aebdec 100644
> --- a/Documentation/virt/kvm/devices/arm-vgic-v3.rst
> +++ b/Documentation/virt/kvm/devices/arm-vgic-v3.rst
> @@ -228,7 +228,7 @@ Groups:
>  
>      KVM_DEV_ARM_VGIC_CTRL_INIT
>        request the initialization of the VGIC, no additional parameter in
> -      kvm_device_attr.addr.
> +      kvm_device_attr.addr. Must be called after all vcpu creations.

Nitpick here: the document writes VCPU with all caps. This also sounds a bit
weird, I think something like "Must be called after all VCPUs have been created"
is clearer.

Thanks,
Alex
>      KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES
>        save all LPI pending bits into guest RAM pending tables.
>