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KVM: x86: Add tlb remote flush callback in kvm_x86_ops.

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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 <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Tianyu Lan 2018-07-19 08:40:17 +00:00 • committed by Paolo Bonzini
commit b08660e59d
3 changed files with 20 additions and 1 deletions
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3
virt/kvm/kvm_main.c
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@ -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);
}