tree 297c0752a5589f3b747f2a2038a6204b77ede85f
parent 1a61b7db7a8dc44ce5010926ed48b519dda92d84
author Sean Christopherson <seanjc@google.com> 1616725184 -0700
committer Paolo Bonzini <pbonzini@redhat.com> 1618662654 -0400

KVM: x86/mmu: Pass address space ID to __kvm_tdp_mmu_zap_gfn_range()

Pass the address space ID to TDP MMU's primary "zap gfn range" helper to
allow the MMU notifier paths to iterate over memslots exactly once.
Currently, both the legacy MMU and TDP MMU iterate over memslots when
looking for an overlapping hva range, which can be quite costly if there
are a large number of memslots.

Add a "flush" parameter so that iterating over multiple address spaces
in the caller will continue to do the right thing when yielding while a
flush is pending from a previous address space.

Note, this also has a functional change in the form of coalescing TLB
flushes across multiple address spaces in kvm_zap_gfn_range(), and also
optimizes the TDP MMU to utilize range-based flushing when running as L1
with Hyper-V enlightenments.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210326021957.1424875-6-seanjc@google.com>
[Keep separate for loops to prepare for other incoming patches. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>