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

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Date:   Wed, 13 Jan 2021 18:18:17 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Alexandru Elisei <alexandru.elisei@....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 Alexandru,

On 1/12/21 4:39 PM, Alexandru Elisei wrote:
> 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.
thanks!
> 
>>
>> 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.
I took your suggestion.

Thanks

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