From: Sean Christopherson <seanjc@xxxxxxxxxx>
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@xxxxxxxxxx>
Reviewed-by: Ben Gardon <bgardon@xxxxxxxxxx>
Message-Id: <20220226001546.360188-19-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
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
