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SubjectRe: [PATCH v2 2/3] KVM: VMX: introduce alloc_loaded_vmcs
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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@redhat.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@redhat.com>

--

Thanks,

David / dhildenb

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