KVM: x86/mmu: Coalesce TDP MMU TLB flushes when zapping collapsible SPTEs

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When zapping collapsible SPTEs across multiple roots, gather pending
flushes and perform a single remote TLB flush at the end, as opposed to
flushing after processing every root.

Note, flush may be cleared by the result of zap_collapsible_spte_range().
This is intended and correct, e.g. yielding may have serviced a prior
pending flush.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210326021957.1424875-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-03-25 19:19:40 -07:00 • committed by Paolo Bonzini

parent c28fa560c5

commit af95b53e56

1 changed files with 13 additions and 9 deletions

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arch/x86/kvm/mmu/tdp_mmu.c

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