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