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KVM: x86/mmu: Batch TLB flushes from TDP MMU for MMU notifier change_spte 

Batch TLB flushes (with other MMUs) when handling ->change_spte()
notifications in the TDP MMU.  The MMU notifier path in question doesn't
allow yielding and correcty flushes before dropping mmu_lock.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220226001546.360188-9-seanjc@google.com>
Reviewed-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-02-26 00:15:26 +00:00 committed by Paolo Bonzini
parent c8e5a0d0e9
commit 93fa50f644
1 changed files with 6 additions and 7 deletions
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13
arch/x86/kvm/mmu/tdp_mmu.c
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@ -1226,13 +1226,12 @@ static bool set_spte_gfn(struct kvm *kvm, struct tdp_iter *iter,
*/
bool kvm_tdp_mmu_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
bool flush = kvm_tdp_mmu_handle_gfn(kvm, range, set_spte_gfn);
/* FIXME: return 'flush' instead of flushing here. */
if (flush)
kvm_flush_remote_tlbs_with_address(kvm, range->start, 1);
return false;
/*
* No need to handle the remote TLB flush under RCU protection, the
* target SPTE _must_ be a leaf SPTE, i.e. cannot result in freeing a
* shadow page. See the WARN on pfn_changed in __handle_changed_spte().
*/
return kvm_tdp_mmu_handle_gfn(kvm, range, set_spte_gfn);
}
/*