linux-kernel - Re: [PATCH 2/2] KVM: x86: Manually retrieve CPUID.0x1 when getting FMS for RESET/INIT

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Date:   Thu, 30 Sep 2021 18:45:27 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+f3985126b746b3d59c9d@...kaller.appspotmail.com,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH 2/2] KVM: x86: Manually retrieve CPUID.0x1 when getting
 FMS for RESET/INIT

On 30/09/21 17:11, Sean Christopherson wrote:
>>
>> But, perhaps adding kvm_find_cpuid_entry_index and removing the last
>> parameter from kvm_find_cpuid_entry would be a good idea.
> I like this idea, but only if callers are forced to specify the index when the
> index is significant, e.g. add a magic CPUID_INDEX_DONT_CARE and WARN in
> cpuid_entry2_find() if index is significant and index == DONT_CARE.

Yeah, or it can just be that kvm_find_cpuid_entry passes -1 which acts 
as the magic value.

> I'll fiddle with this, unless you want the honors?

Not really. :)  Thanks,

Paolo