Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

tools/testing/selftests/net/forwarding/Makefile
  f62c5acc800e ("selftests/net/forwarding: add missing tests to Makefile")
  50fe062c806e ("selftests: forwarding: new test, verify host mdb entries")
https://lore.kernel.org/all/20220502111539.0b7e4621@canb.auug.org.au/

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index c472769e0300..edc68538819b 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -815,14 +815,15 @@ static inline bool __must_check tdp_mmu_iter_cond_resched(struct kvm *kvm,
 	return iter->yielded;
 }
 
-static inline gfn_t tdp_mmu_max_gfn_host(void)
+static inline gfn_t tdp_mmu_max_gfn_exclusive(void)
 {
 	/*
-	 * Bound TDP MMU walks at host.MAXPHYADDR, guest accesses beyond that
-	 * will hit a #PF(RSVD) and never hit an EPT Violation/Misconfig / #NPF,
-	 * and so KVM will never install a SPTE for such addresses.
+	 * Bound TDP MMU walks at host.MAXPHYADDR.  KVM disallows memslots with
+	 * a gpa range that would exceed the max gfn, and KVM does not create
+	 * MMIO SPTEs for "impossible" gfns, instead sending such accesses down
+	 * the slow emulation path every time.
 	 */
-	return 1ULL << (shadow_phys_bits - PAGE_SHIFT);
+	return kvm_mmu_max_gfn() + 1;
 }
 
 static void __tdp_mmu_zap_root(struct kvm *kvm, struct kvm_mmu_page *root,
@@ -830,7 +831,7 @@ static void __tdp_mmu_zap_root(struct kvm *kvm, struct kvm_mmu_page *root,
 {
 	struct tdp_iter iter;
 
-	gfn_t end = tdp_mmu_max_gfn_host();
+	gfn_t end = tdp_mmu_max_gfn_exclusive();
 	gfn_t start = 0;
 
 	for_each_tdp_pte_min_level(iter, root, zap_level, start, end) {
@@ -923,7 +924,7 @@ static bool tdp_mmu_zap_leafs(struct kvm *kvm, struct kvm_mmu_page *root,
 {
 	struct tdp_iter iter;
 
-	end = min(end, tdp_mmu_max_gfn_host());
+	end = min(end, tdp_mmu_max_gfn_exclusive());
 
 	lockdep_assert_held_write(&kvm->mmu_lock);