linux-kernel - Re: [PATCH RESEND] KVM: X86: eliminate obsolete KVM_GET

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Date:   Tue, 25 Feb 2020 01:38:18 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH RESEND] KVM: X86: eliminate obsolete KVM_GET_CPUID2 ioctl

Vitaly Kuznetsov <vkuznets@...hat.com> writes:
>linmiaohe <linmiaohe@...wei.com> writes:
>
>> KVM_GET_CPUID2 ioctl is straight up broken
>
>It may make sense to add the gory details from your previous patch where you were trying to fix it.

Will do.

>> and not used anywhere. Remove it directly.
>>
>> Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
>> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
>>  #define KVM_GET_LAPIC             _IOR(KVMIO,  0x8e, struct kvm_lapic_state)
>>  #define KVM_SET_LAPIC             _IOW(KVMIO,  0x8f, struct kvm_lapic_state)
>>  #define KVM_SET_CPUID2            _IOW(KVMIO,  0x90, struct kvm_cpuid2)
>> -#define KVM_GET_CPUID2            _IOWR(KVMIO, 0x91, struct kvm_cpuid2)
>
>Even if we decide to be strong and remove KVM_GET_CPUID2 completely, I'd suggest we leave a comment here saying that it was deprecated. Leaving the branch in case (returning the same -EINVAL as passing an unsupported
>IOCTL) may also make sense (with a 'deprecated' comment of course).
>

Sounds reasonable. Will try. Many thanks!