From: Sean Christopherson seanjc@google.com
[ 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@vger.kernel.org Cc: Ben Gardon bgardon@google.com Signed-off-by: Sean Christopherson seanjc@google.com Message-Id: 20210325200119.1359384-3-seanjc@google.com Reviewed-by: Ben Gardon bgardon@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com --- arch/x86/kvm/mmu/mmu.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index ed861245ecf0..64ac8ae4f7a1 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 (sp->tdp_mmu_page) - kvm_tdp_mmu_zap_gfn_range(kvm, sp->gfn, - sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level)); - else { + 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);