linux-kernel - Re: [PATCH 1/4] KVM: VMX: rename {vmx,nested_vmx}_vcpu

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Date:   Wed, 16 Oct 2019 09:27:37 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Krish Sadhukhan <krish.sadhukhan@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] KVM: VMX: rename {vmx,nested_vmx}_vcpu_setup
 functions

On 10/16/2019 6:05 AM, Krish Sadhukhan wrote:
> 
> 
> On 10/15/2019 09:40 AM, Xiaoyao Li wrote:
>> Rename {vmx,nested_vmx}_vcpu_setup to {vmx,nested_vmx}_vmcs_setup,
>> to match what they really do.
>>
>> No functional change.
>>
>> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
>> ---
>>   arch/x86/kvm/vmx/nested.c | 2 +-
>>   arch/x86/kvm/vmx/nested.h | 2 +-
>>   arch/x86/kvm/vmx/vmx.c    | 9 +++------
>>   3 files changed, 5 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
>> index 5e231da00310..7935422d311f 100644
>> --- a/arch/x86/kvm/vmx/nested.c
>> +++ b/arch/x86/kvm/vmx/nested.c
>> @@ -5768,7 +5768,7 @@ static int vmx_set_nested_state(struct kvm_vcpu 
>> *vcpu,
>>       return ret;
>>   }
>> -void nested_vmx_vcpu_setup(void)
>> +void nested_vmx_vmcs_setup(void)
>>   {
>>       if (enable_shadow_vmcs) {
>>           vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap));
>> diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
>> index 187d39bf0bf1..2be1ba7482c9 100644
>> --- a/arch/x86/kvm/vmx/nested.h
>> +++ b/arch/x86/kvm/vmx/nested.h
>> @@ -11,7 +11,7 @@ void nested_vmx_setup_ctls_msrs(struct 
>> nested_vmx_msrs *msrs, u32 ept_caps,
>>                   bool apicv);
>>   void nested_vmx_hardware_unsetup(void);
>>   __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct 
>> kvm_vcpu *));
>> -void nested_vmx_vcpu_setup(void);
>> +void nested_vmx_vmcs_setup(void);
>>   void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu);
>>   int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, bool 
>> from_vmentry);
>>   bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason);
>> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
>> index e660e28e9ae0..58b77a882426 100644
>> --- a/arch/x86/kvm/vmx/vmx.c
>> +++ b/arch/x86/kvm/vmx/vmx.c
>> @@ -4161,15 +4161,12 @@ static void ept_set_mmio_spte_mask(void)
>>   #define VMX_XSS_EXIT_BITMAP 0
>> -/*
>> - * Sets up the vmcs for emulated real mode.
>> - */
>> -static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
>> +static void vmx_vmcs_setup(struct vcpu_vmx *vmx)
>>   {
>>       int i;
>>       if (nested)
>> -        nested_vmx_vcpu_setup();
>> +        nested_vmx_vmcs_setup();
>>       if (cpu_has_vmx_msr_bitmap())
>>           vmcs_write64(MSR_BITMAP, __pa(vmx->vmcs01.msr_bitmap));
>> @@ -6777,7 +6774,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct 
>> kvm *kvm, unsigned int id)
>>       cpu = get_cpu();
>>       vmx_vcpu_load(&vmx->vcpu, cpu);
>>       vmx->vcpu.cpu = cpu;
>> -    vmx_vcpu_setup(vmx);
>> +    vmx_vmcs_setup(vmx);
>>       vmx_vcpu_put(&vmx->vcpu);
>>       put_cpu();
>>       if (cpu_need_virtualize_apic_accesses(&vmx->vcpu)) {
> 
> May be we should rename vmx_vcpu_reset() to vmx_vmcs_reset()  as well  ?

Not really. vmx_vcpu_reset() not only resets vmcs but also the emulated 
field of vmx vcpu.