From 007da31e8a2be1102728b48f2175488a674ced6b Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Sat, 26 Feb 2022 00:15:36 +0000 Subject: [PATCH] KVM: x86/mmu: Do remote TLB flush before dropping RCU in TDP MMU resched 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 Reviewed-by: Ben Gardon Message-Id: <20220226001546.360188-19-seanjc@google.com> Signed-off-by: Paolo Bonzini --- 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 cb3d787f17d58..91b327530edac 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 -- 2.50.1