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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: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lan Tianyu 2018-12-06 21:21:13 +08:00 committed by Paolo Bonzini
parent 3cc5ea94de
commit 71883a62fc
1 changed files with 13 additions and 3 deletions
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16
arch/x86/kvm/mmu.c
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@ -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);
}