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Commit 71883a62 authored by Lan Tianyu's avatar Lan Tianyu Committed by Paolo Bonzini
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KVM/MMU: Flush tlb directly in the kvm_zap_gfn_range() 



Originally, flush tlb is done by slot_handle_level_range(). This patch
moves the flush directly to kvm_zap_gfn_range() when range flush is
available, so that only the requested range can be flushed.

Signed-off-by: default avatarLan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3cc5ea94

arch/x86/kvm/mmu.c

+13 −3
Original line number Diff line number Diff line
@@ -5624,8 +5624,13 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end) 
{

	struct kvm_memslots *slots;

	struct kvm_memory_slot *memslot;

	bool flush_tlb = true;

	bool flush = false;

	int i;



	if (kvm_available_flush_tlb_with_range())

		flush_tlb = false;



	spin_lock(&kvm->mmu_lock);

	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {

		slots = __kvm_memslots(kvm, i);
@@ -5637,12 +5642,17 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end) 
			if (start >= end)

				continue;



			slot_handle_level_range(kvm, memslot, kvm_zap_rmapp,

						PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,

						start, end - 1, true);

			flush |= slot_handle_level_range(kvm, memslot,

					kvm_zap_rmapp, PT_PAGE_TABLE_LEVEL,

					PT_MAX_HUGEPAGE_LEVEL, start,

					end - 1, flush_tlb);

		}

	}



	if (flush)

		kvm_flush_remote_tlbs_with_address(kvm, gfn_start,

				gfn_end - gfn_start + 1);



	spin_unlock(&kvm->mmu_lock);

}