| From | Paolo Bonzini <> | Subject | [PATCH v4 19/30] KVM: x86/mmu: Do remote TLB flush before dropping RCU in TDP MMU resched | Date | Thu, 3 Mar 2022 14:38:31 -0500 |
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From: Sean Christopherson <seanjc@google.com>
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> --- arch/x86/kvm/mmu/tdp_mmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index c71debdbc732..3a866fcb5ea9 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -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 -- 2.31.1
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