linux-kernel - Re: [PATCH v3 0/8] Refactor handling flow of KVM_SET

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Message-ID: <e6432b0d-c509-28e0-7720-a4a0e22ea4d9@intel.com>
Date:   Thu, 9 Jul 2020 12:27:30 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v3 0/8] Refactor handling flow of KVM_SET_CPUID*

On 7/8/2020 8:10 PM, Paolo Bonzini wrote:
> On 08/07/20 08:50, Xiaoyao Li wrote:
>> This serial is the extended version of
>> https://lkml.kernel.org/r/20200528151927.14346-1-xiaoyao.li@intel.com
>>
>> First two patches are bug fixing, and the others aim to refactor the flow
>> of SET_CPUID* as:
>>
>> 1. cpuid check: check if userspace provides legal CPUID settings;
>>
>> 2. cpuid update: Update some special CPUID bits based on current vcpu
>>                   state, e.g., OSXSAVE, OSPKE, ...
>>
>> 3. update vcpu model: Update vcpu model (settings) based on the final CPUID
>>                        settings.
>>
>> v3:
>>   - Add a note in KVM api doc to state the previous CPUID configuration
>>     is not reliable if current KVM_SET_CPUID* fails [Jim]
>>   - Adjust Patch 2 to reduce code churn [Sean]
>>   - Commit message refine to add more justification [Sean]
>>   - Add a new patch (7)
>>
>> v2:
>> https://lkml.kernel.org/r/20200623115816.24132-1-xiaoyao.li@intel.com
>>   - rebase to kvm/queue: a037ff353ba6 ("Merge branch 'kvm-master' into HEAD")
>>   - change the name of kvm_update_state_based_on_cpuid() to
>>     kvm_update_vcpu_model() [Sean]
>>   - Add patch 5 to rename kvm_x86_ops.cpuid_date() to
>>     kvm_x86_ops.update_vcpu_model()
>>
>> v1:
>> https://lkml.kernel.org/r/20200529085545.29242-1-xiaoyao.li@intel.com
>>
>> Xiaoyao Li (8):
>>    KVM: X86: Reset vcpu->arch.cpuid_nent to 0 if SET_CPUID* fails
>>    KVM: X86: Go on updating other CPUID leaves when leaf 1 is absent
>>    KVM: X86: Introduce kvm_check_cpuid()
>>    KVM: X86: Split kvm_update_cpuid()
>>    KVM: X86: Rename cpuid_update() to update_vcpu_model()
>>    KVM: X86: Move kvm_x86_ops.update_vcpu_model() into
>>      kvm_update_vcpu_model()
>>    KVM: lapic: Use guest_cpuid_has() in kvm_apic_set_version()
>>    KVM: X86: Move kvm_apic_set_version() to kvm_update_vcpu_model()
>>
>>   Documentation/virt/kvm/api.rst  |   4 ++
>>   arch/x86/include/asm/kvm_host.h |   2 +-
>>   arch/x86/kvm/cpuid.c            | 107 ++++++++++++++++++++------------
>>   arch/x86/kvm/cpuid.h            |   3 +-
>>   arch/x86/kvm/lapic.c            |   4 +-
>>   arch/x86/kvm/svm/svm.c          |   4 +-
>>   arch/x86/kvm/vmx/nested.c       |   2 +-
>>   arch/x86/kvm/vmx/vmx.c          |   4 +-
>>   arch/x86/kvm/x86.c              |   1 +
>>   9 files changed, 81 insertions(+), 50 deletions(-)
>>
> 
> Queued patches 1/2/3/7/8, thanks.

Paolo,

I notice that you queued patch 8 into kvm/queue branch as
commit 84dd4897524e "KVM: X86: Move kvm_apic_set_version() to 
kvm_update_vcpu_model()"

Can you change the subject of that commit to "KVM: X86: Move 
kvm_apic_set_version() to kvm_update_cpuid()" ?

> Paolo
>