KVM: x86: Add tlb remote flush callback in kvm_x86_ops.
This patch is to provide a way for platforms to register hv tlb remote flush callback and this helps to optimize operation of tlb flush among vcpus for nested virtualization case. Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>hifive-unleashed-5.1
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@ -985,6 +985,7 @@ struct kvm_x86_ops {
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void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
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void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
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void (*tlb_flush)(struct kvm_vcpu *vcpu, bool invalidate_gpa);
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void (*tlb_flush)(struct kvm_vcpu *vcpu, bool invalidate_gpa);
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int (*tlb_remote_flush)(struct kvm *kvm);
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/*
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/*
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* Flush any TLB entries associated with the given GVA.
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* Flush any TLB entries associated with the given GVA.
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@ -1145,6 +1146,16 @@ static inline void kvm_arch_free_vm(struct kvm *kvm)
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return kvm_x86_ops->vm_free(kvm);
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return kvm_x86_ops->vm_free(kvm);
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}
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}
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#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
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static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm)
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{
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if (kvm_x86_ops->tlb_remote_flush &&
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!kvm_x86_ops->tlb_remote_flush(kvm))
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return 0;
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else
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return -ENOTSUPP;
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}
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int kvm_mmu_module_init(void);
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int kvm_mmu_module_init(void);
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void kvm_mmu_module_exit(void);
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void kvm_mmu_module_exit(void);
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@ -834,6 +834,13 @@ static inline void kvm_arch_free_vm(struct kvm *kvm)
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}
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}
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#endif
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#endif
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#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
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static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm)
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{
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return -ENOTSUPP;
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}
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#endif
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#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
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#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
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void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
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void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
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void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
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void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
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@ -273,7 +273,8 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
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* kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
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* kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
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* barrier here.
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* barrier here.
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*/
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*/
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if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
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if (!kvm_arch_flush_remote_tlb(kvm)
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|| kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
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++kvm->stat.remote_tlb_flush;
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++kvm->stat.remote_tlb_flush;
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cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
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cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
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}
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}
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