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

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Date:   Thu, 9 Jul 2020 11:37:41 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.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 09/07/20 06:27, Xiaoyao Li wrote:
> 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()" ?

Good catch, thanks.

Paolo