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

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Date:   Wed, 16 Oct 2019 11:09:58 -0700
From:   Krish Sadhukhan <krish.sadhukhan@...cle.com>
To:     Xiaoyao Li <xiaoyao.li@...el.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 10/15/19 6:27 PM, Xiaoyao Li wrote:
> 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.

It would be a better organization of the code if the resetting of the 
VMCS fields were placed in a separate function.


Reviewed-by: Krish Sadhukhan <krish.sadhukhan@...cle.com>