KVM: x86/mmu: Skip tlb flush if it has been done in zap_gfn_range()

If the parameter flush is set, zap_gfn_range() would flush remote tlb
when yield, then tlb flush is not needed outside. So use the return
value of zap_gfn_range() directly instead of OR on it in
kvm_unmap_gfn_range() and kvm_tdp_mmu_unmap_gfn_range().

Fixes: 3039bcc744980 ("KVM: Move x86's MMU notifier memslot walkers to generic code")
Signed-off-by: Hou Wenlong <houwenlong93@linux.alibaba.com>
Message-Id: <5e16546e228877a4d974f8c0e448a93d52c7a5a9.1637140154.git.houwenlong93@linux.alibaba.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 3be9bee..0a8436e 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1582,7 +1582,7 @@ bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
                flush = kvm_handle_gfn_range(kvm, range, kvm_unmap_rmapp);
 
        if (is_tdp_mmu_enabled(kvm))
-               flush |= kvm_tdp_mmu_unmap_gfn_range(kvm, range, flush);
+               flush = kvm_tdp_mmu_unmap_gfn_range(kvm, range, flush);
 
        return flush;
 }

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 377a967..1f8c9f7 100644 (file)
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1032,8 +1032,8 @@ bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
        struct kvm_mmu_page *root;
 
        for_each_tdp_mmu_root(kvm, root, range->slot->as_id)
-               flush |= zap_gfn_range(kvm, root, range->start, range->end,
-                                      range->may_block, flush, false);
+               flush = zap_gfn_range(kvm, root, range->start, range->end,
+                                     range->may_block, flush, false);
 
        return flush;
 }