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KVM: x86/mmu: Do remote TLB flush before dropping RCU in TDP MMU resched

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When yielding in the TDP MMU iterator, service any pending TLB flush
before dropping RCU protections in anticipation of using the caller's RCU
"lock" as a proxy for vCPUs in the guest.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220226001546.360188-19-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-02-26 00:15:36 +00:00 committed by Paolo Bonzini
parent cf3e26427c
commit bd29677952
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/mmu/tdp_mmu.c
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@ -716,11 +716,11 @@ static inline bool __must_check tdp_mmu_iter_cond_resched(struct kvm *kvm,
return false;
if (need_resched() || rwlock_needbreak(&kvm->mmu_lock)) {
rcu_read_unlock();
if (flush)
kvm_flush_remote_tlbs(kvm);
rcu_read_unlock();
if (shared)
cond_resched_rwlock_read(&kvm->mmu_lock);
else