[PATCH 5.17 0952/1126] KVM: x86/mmu: Use common TDP MMU zap helper for MMU notifier unmap hook

Greg Kroah-Hartman
2022-04-05T11:08:26Z

From: Sean Christopherson <seanjc@google.com>

commit 83b83a02073ec8d18c77a9bbe0881d710f7a9d32 upstream.

Use the common TDP MMU zap helper when handling an MMU notifier unmap
event, the two flows are semantically identical. Consolidate the code in
preparation for a future bug fix, as both kvm_tdp_mmu_unmap_gfn_range()
and __kvm_tdp_mmu_zap_gfn_range() are guilty of not zapping SPTEs in
invalid roots.

No functional change intended.

Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211215011557.399940-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kvm/mmu/tdp_mmu.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1032,13 +1032,8 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcp
bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
bool flush)
{
- struct kvm_mmu_page *root;
-
- for_each_tdp_mmu_root_yield_safe(kvm, root, range->slot->as_id, false)
- flush = zap_gfn_range(kvm, root, range->start, range->end,
- range->may_block, flush, false);
-
- return flush;
+ return __kvm_tdp_mmu_zap_gfn_range(kvm, range->slot->as_id, range->start,
+ range->end, range->may_block, flush);
}

typedef bool (*tdp_handler_t)(struct kvm *kvm, struct tdp_iter *iter,