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SubjectRe: [PATCH] KVM: X86: Make fpu allocation a common function
Date
Xiaoyao Li <xiaoyao.li@intel.com> writes:

> They are duplicated codes to create vcpu.arch.{user,guest}_fpu in VMX
> and SVM. Make them common functions.
>
> No functional change intended.

Would it rather make sense to move this code to
kvm_arch_vcpu_create()/kvm_arch_vcpu_destroy() instead?

>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
> arch/x86/kvm/svm.c | 20 +++-----------------
> arch/x86/kvm/vmx/vmx.c | 20 +++-----------------
> arch/x86/kvm/x86.h | 26 ++++++++++++++++++++++++++
> 3 files changed, 32 insertions(+), 34 deletions(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index e479ea9bc9da..0116a3c37a07 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -2156,21 +2156,9 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
> goto out;
> }
>
> - svm->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
> - GFP_KERNEL_ACCOUNT);
> - if (!svm->vcpu.arch.user_fpu) {
> - printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
> - err = -ENOMEM;
> + err = kvm_vcpu_create_fpu(&svm->vcpu);
> + if (err)
> goto free_partial_svm;
> - }
> -
> - svm->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
> - GFP_KERNEL_ACCOUNT);
> - if (!svm->vcpu.arch.guest_fpu) {
> - printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
> - err = -ENOMEM;
> - goto free_user_fpu;
> - }
>
> err = kvm_vcpu_init(&svm->vcpu, kvm, id);
> if (err)
> @@ -2231,9 +2219,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
> uninit:
> kvm_vcpu_uninit(&svm->vcpu);
> free_svm:
> - kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu);
> -free_user_fpu:
> - kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.user_fpu);
> + kvm_vcpu_free_fpu(&svm->vcpu);
> free_partial_svm:
> kmem_cache_free(kvm_vcpu_cache, svm);
> out:
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index e660e28e9ae0..53d9298ff648 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -6710,21 +6710,9 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
> if (!vmx)
> return ERR_PTR(-ENOMEM);
>
> - vmx->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
> - GFP_KERNEL_ACCOUNT);
> - if (!vmx->vcpu.arch.user_fpu) {
> - printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
> - err = -ENOMEM;
> + err = kvm_vcpu_create_fpu(&vmx->vcpu);
> + if (err)
> goto free_partial_vcpu;
> - }
> -
> - vmx->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
> - GFP_KERNEL_ACCOUNT);
> - if (!vmx->vcpu.arch.guest_fpu) {
> - printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
> - err = -ENOMEM;
> - goto free_user_fpu;
> - }
>
> vmx->vpid = allocate_vpid();
>
> @@ -6825,9 +6813,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
> kvm_vcpu_uninit(&vmx->vcpu);
> free_vcpu:
> free_vpid(vmx->vpid);
> - kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
> -free_user_fpu:
> - kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
> + kvm_vcpu_free_fpu(&vmx->vcpu);
> free_partial_vcpu:
> kmem_cache_free(kvm_vcpu_cache, vmx);
> return ERR_PTR(err);
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index 45d82b8277e5..c27e7ac91337 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -367,4 +367,30 @@ static inline bool kvm_pat_valid(u64 data)
> void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu);
> void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu);
>
> +static inline int kvm_vcpu_create_fpu(struct kvm_vcpu *vcpu)
> +{
> + vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
> + GFP_KERNEL_ACCOUNT);
> + if (!vcpu->arch.user_fpu) {
> + printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
> + return -ENOMEM;
> + }
> +
> + vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
> + GFP_KERNEL_ACCOUNT);
> + if (!vcpu->arch.guest_fpu) {
> + printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
> + kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +static inline void kvm_vcpu_free_fpu(struct kvm_vcpu *vcpu)
> +{
> + kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
> + kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
> +}
> +
> #endif

--
Vitaly

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