linux-kernel - Re: [PATCH v2 2/3] KVM: VMX: introduce alloc_loaded

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Date:   Mon, 29 Jan 2018 11:31:29 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        KarimAllah Ahmed <karahmed@...zon.de>
Subject: Re: [PATCH v2 2/3] KVM: VMX: introduce alloc_loaded_vmcs

On 27.01.2018 09:50, Paolo Bonzini wrote:
> Group together the calls to alloc_vmcs and loaded_vmcs_init.  Soon we'll also
> allocate an MSR bitmap there.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/vmx.c | 36 ++++++++++++++++++++++--------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index ad6a883b7a32..ab4b9bc99a52 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -3829,11 +3829,6 @@ static struct vmcs *alloc_vmcs_cpu(int cpu)
>  	return vmcs;
>  }
>  
> -static struct vmcs *alloc_vmcs(void)
> -{
> -	return alloc_vmcs_cpu(raw_smp_processor_id());
> -}
> -
>  static void free_vmcs(struct vmcs *vmcs)
>  {
>  	free_pages((unsigned long)vmcs, vmcs_config.order);
> @@ -3852,6 +3847,22 @@ static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
>  	WARN_ON(loaded_vmcs->shadow_vmcs != NULL);
>  }
>  
> +static struct vmcs *alloc_vmcs(void)
> +{
> +	return alloc_vmcs_cpu(raw_smp_processor_id());
> +}
> +
> +static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
> +{
> +	loaded_vmcs->vmcs = alloc_vmcs();
> +	if (!loaded_vmcs->vmcs)
> +		return -ENOMEM;
> +
> +	loaded_vmcs->shadow_vmcs = NULL;
> +	loaded_vmcs_init(loaded_vmcs);
> +	return 0;
> +}
> +
>  static void free_kvm_area(void)
>  {
>  	int cpu;
> @@ -7145,12 +7156,11 @@ static int enter_vmx_operation(struct kvm_vcpu *vcpu)
>  {
>  	struct vcpu_vmx *vmx = to_vmx(vcpu);
>  	struct vmcs *shadow_vmcs;
> +	int r;
>  
> -	vmx->nested.vmcs02.vmcs = alloc_vmcs();
> -	vmx->nested.vmcs02.shadow_vmcs = NULL;
> -	if (!vmx->nested.vmcs02.vmcs)
> +	r = alloc_loaded_vmcs(&vmx->nested.vmcs02);
> +	if (r < 0)
>  		goto out_vmcs02;
> -	loaded_vmcs_init(&vmx->nested.vmcs02);
>  
>  	if (cpu_has_vmx_msr_bitmap()) {
>  		vmx->nested.msr_bitmap =
> @@ -9545,13 +9555,11 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
>  	if (!vmx->guest_msrs)
>  		goto free_pml;
>  
> -	vmx->loaded_vmcs = &vmx->vmcs01;
> -	vmx->loaded_vmcs->vmcs = alloc_vmcs();
> -	vmx->loaded_vmcs->shadow_vmcs = NULL;
> -	if (!vmx->loaded_vmcs->vmcs)
> +	err = alloc_loaded_vmcs(&vmx->vmcs01);
> +	if (err < 0)
>  		goto free_msrs;
> -	loaded_vmcs_init(vmx->loaded_vmcs);
>  
> +	vmx->loaded_vmcs = &vmx->vmcs01;
>  	cpu = get_cpu();
>  	vmx_vcpu_load(&vmx->vcpu, cpu);
>  	vmx->vcpu.cpu = cpu;
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 

Thanks,

David / dhildenb