forked from luck/tmp_suning_uos_patched
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: Lan Tianyu <Tianyu.Lan@microsoft.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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3cc5ea94de
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@ -5624,8 +5624,13 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
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{
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struct kvm_memslots *slots;
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struct kvm_memory_slot *memslot;
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bool flush_tlb = true;
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bool flush = false;
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int i;
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if (kvm_available_flush_tlb_with_range())
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flush_tlb = false;
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spin_lock(&kvm->mmu_lock);
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for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
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slots = __kvm_memslots(kvm, i);
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@ -5637,12 +5642,17 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
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if (start >= end)
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continue;
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slot_handle_level_range(kvm, memslot, kvm_zap_rmapp,
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PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,
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start, end - 1, true);
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flush |= slot_handle_level_range(kvm, memslot,
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kvm_zap_rmapp, PT_PAGE_TABLE_LEVEL,
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PT_MAX_HUGEPAGE_LEVEL, start,
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end - 1, flush_tlb);
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}
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}
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if (flush)
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kvm_flush_remote_tlbs_with_address(kvm, gfn_start,
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gfn_end - gfn_start + 1);
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spin_unlock(&kvm->mmu_lock);
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}
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