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| author | Lan Tianyu <Tianyu.Lan@microsoft.com> | 2018-12-06 16:21:13 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-12-21 13:28:43 +0300 |
| commit | 71883a62fcd6c70639fa12cda733378b4d997409 (patch) | |
| tree | b8fb75933370682a7ff7c6bbc82c49dcbf57a1dd | |
| parent | 3cc5ea94de5f71dff0d3353f610e729308583e6b (diff) | |
| download | linux-71883a62fcd6c70639fa12cda733378b4d997409.tar.xz | |
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>
| -rw-r--r-- | arch/x86/kvm/mmu.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index fd61d715ebd6..ce770b446238 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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); } |