KVM: x86/mmu: Drop a redundant remote TLB flush in kvm_zap_gfn_range()

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Remove an unnecessary remote TLB flush in kvm_zap_gfn_range() now that
said function holds mmu_lock for write for its entire duration.  The
flush was added by the now-reverted commit to allow TDP MMU to flush while
holding mmu_lock for read, as the transition from write=>read required
dropping the lock and thus a pending flush needed to be serviced.

Fixes: 5a324c24b6 ("Revert "KVM: x86/mmu: Allow zap gfn range to operate under the mmu read lock"")
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Cc: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211022010005.1454978-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Sean Christopherson 2021-10-21 18:00:04 -07:00 • committed by Paolo Bonzini

parent bc3b3c1002

commit e8be2a5ba8

1 changed files with 0 additions and 3 deletions

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arch/x86/kvm/mmu/mmu.c

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