linux-kernel - Re: [PATCH v2 3/3] KVM: SVM: Add irqchip

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Date:   Fri, 15 Sep 2017 23:14:23 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, joro@...tes.org
Subject: Re: [PATCH v2 3/3] KVM: SVM: Add irqchip_split() checks before
 enabling AVIC

On 15/09/2017 21:21, Suravee Suthikulpanit wrote:
>>>>
>>>>
>>>>  static bool svm_get_enable_apicv(struct kvm_vcpu *vcpu)
>>>>  {
>>> A close contender was pr_info_once() here:
>>>
>>>     if (avic && !irqchip_split(vcpu->kvm))
>>>         pr_info_once(...)
>>>
>>
>> Looks good.
> 
> Actually, thinking about it again, this would not work either since
> pr_xxx_once() would only print the message once per loading of kvm_amd
> module. However, we would prefer the message to be printed per VM
> initialization. I also tried adding the check and print this message in
> the kvm_x86_ops.vm_init(), but this also does not work since the
> vm_init() function is called before the
> kvm_vm_ioctl_enable_cap(KVM_CAP_SPLIT_IRQCHIP).
> 
> Therefore, pr_info() might be better here, even though this would get
> print per VCPU initialization. Any other suggestions?

My suggestion is to make it pr_info_once.  No one looks at dmesg anyway
unless things go very wrong.

Paolo