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| author | Tianyu Lan <Tianyu.Lan@microsoft.com> | 2018-07-19 08:40:17 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-08-06 17:59:06 +0200 |
| commit | b08660e59dbdb600c55953787ed2265a0b510f77 (patch) | |
| tree | 3016620245ab6babe9c65babdcff9730f2578072 | |
| parent | 60cfce4c4f6f6741882032ee6f895e835533a16b (diff) | |
| download | linux-stable-b08660e59dbdb600c55953787ed2265a0b510f77.tar.gz linux-stable-b08660e59dbdb600c55953787ed2265a0b510f77.tar.bz2 linux-stable-b08660e59dbdb600c55953787ed2265a0b510f77.zip | |
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>
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 11 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 7 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 3 |
3 files changed, 20 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 75ab578c3f6a..150937e64f63 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -985,6 +985,7 @@ struct kvm_x86_ops { void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags); void (*tlb_flush)(struct kvm_vcpu *vcpu, bool invalidate_gpa); + int (*tlb_remote_flush)(struct kvm *kvm); /* * Flush any TLB entries associated with the given GVA. @@ -1145,6 +1146,16 @@ static inline void kvm_arch_free_vm(struct kvm *kvm) return kvm_x86_ops->vm_free(kvm); } +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB +static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm) +{ + if (kvm_x86_ops->tlb_remote_flush && + !kvm_x86_ops->tlb_remote_flush(kvm)) + return 0; + else + return -ENOTSUPP; +} + int kvm_mmu_module_init(void); void kvm_mmu_module_exit(void); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2840ac74a3d7..7c7362dd2faa 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -834,6 +834,13 @@ static inline void kvm_arch_free_vm(struct kvm *kvm) } #endif +#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB +static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm) +{ + return -ENOTSUPP; +} +#endif + #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA void kvm_arch_register_noncoherent_dma(struct kvm *kvm); void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 8f461e0ed382..74544d20bbf8 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -273,7 +273,8 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that * barrier here. */ - if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) + if (!kvm_arch_flush_remote_tlb(kvm) + || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) ++kvm->stat.remote_tlb_flush; cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); } |