This is a note to let you know that I've just added the patch titled KVM: x86/mmu: Ensure TLBs are flushed for TDP MMU during NX zapping to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-x86-mmu-ensure-tlbs-are-flushed-for-tdp-mmu-duri.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 59cf6e724c855ccfa7d36d6bcd2b8aaa2a0dcc39 Author: Sean Christopherson <seanjc@xxxxxxxxxx> Date: Thu Mar 25 13:01:18 2021 -0700 KVM: x86/mmu: Ensure TLBs are flushed for TDP MMU during NX zapping [ Upstream commit 048f49809c526348775425420fb5b8e84fd9a133 ] Honor the "flush needed" return from kvm_tdp_mmu_zap_gfn_range(), which does the flush itself if and only if it yields (which it will never do in this particular scenario), and otherwise expects the caller to do the flush. If pages are zapped from the TDP MMU but not the legacy MMU, then no flush will occur. Fixes: 29cf0f5007a2 ("kvm: x86/mmu: NX largepage recovery for TDP MMU") Cc: stable@xxxxxxxxxxxxxxx Cc: Ben Gardon <bgardon@xxxxxxxxxx> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Message-Id: <20210325200119.1359384-3-seanjc@xxxxxxxxxx> Reviewed-by: Ben Gardon <bgardon@xxxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index d9901836d7aa..8643c766415a 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -5985,6 +5985,8 @@ static void kvm_recover_nx_lpages(struct kvm *kvm) struct kvm_mmu_page *sp; unsigned int ratio; LIST_HEAD(invalid_list); + bool flush = false; + gfn_t gfn_end; ulong to_zap; rcu_idx = srcu_read_lock(&kvm->srcu); @@ -6006,19 +6008,20 @@ static void kvm_recover_nx_lpages(struct kvm *kvm) lpage_disallowed_link); WARN_ON_ONCE(!sp->lpage_disallowed); if (is_tdp_mmu_page(sp)) { - kvm_tdp_mmu_zap_gfn_range(kvm, sp->gfn, - sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level)); + gfn_end = sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level); + flush = kvm_tdp_mmu_zap_gfn_range(kvm, sp->gfn, gfn_end); } else { kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); WARN_ON_ONCE(sp->lpage_disallowed); } if (need_resched() || spin_needbreak(&kvm->mmu_lock)) { - kvm_mmu_commit_zap_page(kvm, &invalid_list); + kvm_mmu_remote_flush_or_zap(kvm, &invalid_list, flush); cond_resched_lock(&kvm->mmu_lock); + flush = false; } } - kvm_mmu_commit_zap_page(kvm, &invalid_list); + kvm_mmu_remote_flush_or_zap(kvm, &invalid_list, flush); spin_unlock(&kvm->mmu_lock); srcu_read_unlock(&kvm->srcu, rcu_idx);