linux-kernel - Re: [PATCH] KVM: VMX: check match table

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Date:   Wed, 27 Sep 2017 14:36:03 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Josh Triplett <josh@...htriplett.org>,
        Nick Desaulniers <nick.desaulniers@...il.com>
Cc:     kay@...y.org, avi@...hat.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: VMX: check match table

On 26/09/2017 19:12, Josh Triplett wrote:
>> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
>> index 6970249c09fc..e1a00b130935 100644
>> --- a/arch/x86/kvm/vmx.c
>> +++ b/arch/x86/kvm/vmx.c
>> @@ -12074,7 +12074,12 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
>>  
>>  static int __init vmx_init(void)
>>  {
>> -	int r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
>> +	int r;
>> +
>> +	if (!x86_match_cpu(vmx_cpu_id))
>> +		return -ENODEV;
> Does this make any other checks redundant and removable?

It would make sense to place it in cpu_has_kvm_support instead, and the
same in svm.c's has_svm.

But there's a lot of pointless indirection to clean up there...

Paolo

>> +
>> +	r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
>>                       __alignof__(struct vcpu_vmx), THIS_MODULE);
>>  	if (r)
>>  		return r;
>> --