KVM: x86/mmu: Don't allow TDP MMU to yield when recovering NX pages

Prevent the TDP MMU from yielding when zapping a gfn range during NX
page recovery.  If a flush is pending from a previous invocation of the
zapping helper, either in the TDP MMU or the legacy MMU, but the TDP MMU
has not accumulated a flush for the current invocation, then yielding
will release mmu_lock with stale TLB entries.

That being said, this isn't technically a bug fix in the current code, as
the TDP MMU will never yield in this case.  tdp_mmu_iter_cond_resched()
will yield if and only if it has made forward progress, as defined by the
current gfn vs. the last yielded (or starting) gfn.  Because zapping a
single shadow page is guaranteed to (a) find that page and (b) step
sideways at the level of the shadow page, the TDP iter will break its loop
before getting a chance to yield.

But that is all very, very subtle, and will break at the slightest sneeze,
e.g. zapping while holding mmu_lock for read would break as the TDP MMU
wouldn't be guaranteed to see the present shadow page, and thus could step
sideways at a lower level.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210325200119.1359384-4-seanjc@google.com>
[Add lockdep assertion. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 2705f9f..486aa94 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5885,7 +5885,6 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
        unsigned int ratio;
        LIST_HEAD(invalid_list);
        bool flush = false;
-       gfn_t gfn_end;
        ulong to_zap;
 
        rcu_idx = srcu_read_lock(&kvm->srcu);
@@ -5907,8 +5906,7 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
                                      lpage_disallowed_link);
                WARN_ON_ONCE(!sp->lpage_disallowed);
                if (is_tdp_mmu_page(sp)) {
-                       gfn_end = sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level);
-                       flush = kvm_tdp_mmu_zap_gfn_range(kvm, sp->gfn, gfn_end);
+                       flush = kvm_tdp_mmu_zap_sp(kvm, sp);
                } else {
                        kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
                        WARN_ON_ONCE(sp->lpage_disallowed);

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index f80648a..81352cd 100644 (file)
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -723,13 +723,14 @@ static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
  * SPTEs have been cleared and a TLB flush is needed before releasing the
  * MMU lock.
  */
-bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end)
+bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end,
+                                bool can_yield)
 {
        struct kvm_mmu_page *root;
        bool flush = false;
 
        for_each_tdp_mmu_root_yield_safe(kvm, root)
-               flush = zap_gfn_range(kvm, root, start, end, true, flush);
+               flush = zap_gfn_range(kvm, root, start, end, can_yield, flush);
 
        return flush;
 }

diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h
index 3b761c1..31096ec 100644 (file)
--- a/arch/x86/kvm/mmu/tdp_mmu.h
+++ b/arch/x86/kvm/mmu/tdp_mmu.h
@@ -8,7 +8,29 @@
 hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
 void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root);
 
-bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end);
+bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end,
+                                bool can_yield);
+static inline bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start,
+                                            gfn_t end)
+{
+       return __kvm_tdp_mmu_zap_gfn_range(kvm, start, end, true);
+}
+static inline bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
+{
+       gfn_t end = sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level);
+
+       /*
+        * Don't allow yielding, as the caller may have a flush pending.  Note,
+        * if mmu_lock is held for write, zapping will never yield in this case,
+        * but explicitly disallow it for safety.  The TDP MMU does not yield
+        * until it has made forward progress (steps sideways), and when zapping
+        * a single shadow page that it's guaranteed to see (thus the mmu_lock
+        * requirement), its "step sideways" will always step beyond the bounds
+        * of the shadow page's gfn range and stop iterating before yielding.
+        */
+       lockdep_assert_held_write(&kvm->mmu_lock);
+       return __kvm_tdp_mmu_zap_gfn_range(kvm, sp->gfn, end, false);
+}
 void kvm_tdp_mmu_zap_all(struct kvm *kvm);
 
 int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,